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This library is a fork of Apache DdlUtils. DdlUtils is a small, easy-to-use component for working with Database Definition (DDL) files.
package org.jumpmind.symmetric.ddl.platform;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import java.io.IOException;
import java.io.Writer;
import java.rmi.server.UID;
import java.sql.Types;
import java.text.DateFormat;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import org.apache.commons.collections.Closure;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.map.ListOrderedMap;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jumpmind.symmetric.ddl.DdlUtilsException;
import org.jumpmind.symmetric.ddl.Platform;
import org.jumpmind.symmetric.ddl.PlatformInfo;
import org.jumpmind.symmetric.ddl.alteration.AddColumnChange;
import org.jumpmind.symmetric.ddl.alteration.AddForeignKeyChange;
import org.jumpmind.symmetric.ddl.alteration.AddIndexChange;
import org.jumpmind.symmetric.ddl.alteration.AddPrimaryKeyChange;
import org.jumpmind.symmetric.ddl.alteration.AddTableChange;
import org.jumpmind.symmetric.ddl.alteration.ColumnAutoIncrementChange;
import org.jumpmind.symmetric.ddl.alteration.ColumnDataTypeChange;
import org.jumpmind.symmetric.ddl.alteration.ColumnDefaultValueChange;
import org.jumpmind.symmetric.ddl.alteration.ColumnRequiredChange;
import org.jumpmind.symmetric.ddl.alteration.ColumnSizeChange;
import org.jumpmind.symmetric.ddl.alteration.ModelChange;
import org.jumpmind.symmetric.ddl.alteration.ModelComparator;
import org.jumpmind.symmetric.ddl.alteration.PrimaryKeyChange;
import org.jumpmind.symmetric.ddl.alteration.RemoveColumnChange;
import org.jumpmind.symmetric.ddl.alteration.RemoveForeignKeyChange;
import org.jumpmind.symmetric.ddl.alteration.RemoveIndexChange;
import org.jumpmind.symmetric.ddl.alteration.RemovePrimaryKeyChange;
import org.jumpmind.symmetric.ddl.alteration.RemoveTableChange;
import org.jumpmind.symmetric.ddl.alteration.TableChange;
import org.jumpmind.symmetric.ddl.model.Column;
import org.jumpmind.symmetric.ddl.model.Database;
import org.jumpmind.symmetric.ddl.model.ForeignKey;
import org.jumpmind.symmetric.ddl.model.Index;
import org.jumpmind.symmetric.ddl.model.IndexColumn;
import org.jumpmind.symmetric.ddl.model.ModelException;
import org.jumpmind.symmetric.ddl.model.Reference;
import org.jumpmind.symmetric.ddl.model.Table;
import org.jumpmind.symmetric.ddl.model.TypeMap;
import org.jumpmind.symmetric.ddl.util.CallbackClosure;
import org.jumpmind.symmetric.ddl.util.MultiInstanceofPredicate;
/**
* This class is a collection of Strategy methods for creating the DDL required to create and drop
* databases and tables.
*
* It is hoped that just a single implementation of this class, for each database should make creating DDL
* for each physical database fairly straightforward.
*
* An implementation of this class can always delegate down to some templating technology such as Velocity if
* it requires. Though often that can be quite complex when attempting to reuse code across many databases.
* Hopefully only a small amount code needs to be changed on a per database basis.
*
* @version $Revision: 518498 $
*/
public abstract class SqlBuilder
{
/** The line separator for in between sql commands. */
private static final String LINE_SEPARATOR = System.getProperty("line.separator", "\n");
/** The placeholder for the size value in the native type spec. */
protected static final String SIZE_PLACEHOLDER = "{0}";
/** The Log to which logging calls will be made. */
protected final Log _log = LogFactory.getLog(SqlBuilder.class);
/** The platform that this builder belongs to. */
private Platform _platform;
/** The current Writer used to output the SQL to. */
private Writer _writer;
/** The indentation used to indent commands. */
private String _indent = " ";
/** An optional locale specification for number and date formatting. */
private String _valueLocale;
/** The date formatter. */
private DateFormat _valueDateFormat;
/** The date time formatter. */
private DateFormat _valueTimeFormat;
/** The number formatter. */
private NumberFormat _valueNumberFormat;
/** Helper object for dealing with default values. */
private DefaultValueHelper _defaultValueHelper = new DefaultValueHelper();
/** The character sequences that need escaping. */
private Map _charSequencesToEscape = new ListOrderedMap();
//
// Configuration
//
/**
* Creates a new sql builder.
*
* @param platform The plaftform this builder belongs to
*/
public SqlBuilder(Platform platform)
{
_platform = platform;
}
/**
* Returns the platform object.
*
* @return The platform
*/
public Platform getPlatform()
{
return _platform;
}
/**
* Returns the platform info object.
*
* @return The info object
*/
public PlatformInfo getPlatformInfo()
{
return _platform.getPlatformInfo();
}
/**
* Returns the writer that the DDL is printed to.
*
* @return The writer
*/
public Writer getWriter()
{
return _writer;
}
/**
* Sets the writer for printing the DDL to.
*
* @param writer The writer
*/
public void setWriter(Writer writer)
{
_writer = writer;
}
/**
* Returns the default value helper.
*
* @return The default value helper
*/
public DefaultValueHelper getDefaultValueHelper()
{
return _defaultValueHelper;
}
/**
* Returns the string used to indent the SQL.
*
* @return The indentation string
*/
public String getIndent()
{
return _indent;
}
/**
* Sets the string used to indent the SQL.
*
* @param indent The indentation string
*/
public void setIndent(String indent)
{
_indent = indent;
}
/**
* Returns the locale that is used for number and date formatting
* (when printing default values and in generates insert/update/delete
* statements).
*
* @return The locale or null if default formatting is used
*/
public String getValueLocale()
{
return _valueLocale;
}
/**
* Sets the locale that is used for number and date formatting
* (when printing default values and in generates insert/update/delete
* statements).
*
* @param localeStr The new locale or null if default formatting
* should be used; Format is "language[_country[_variant]]"
*/
public void setValueLocale(String localeStr)
{
if (localeStr != null)
{
int sepPos = localeStr.indexOf('_');
String language = null;
String country = null;
String variant = null;
if (sepPos > 0)
{
language = localeStr.substring(0, sepPos);
country = localeStr.substring(sepPos + 1);
sepPos = country.indexOf('_');
if (sepPos > 0)
{
variant = country.substring(sepPos + 1);
country = country.substring(0, sepPos);
}
}
else
{
language = localeStr;
}
if (language != null)
{
Locale locale = null;
if (variant != null)
{
locale = new Locale(language, country, variant);
}
else if (country != null)
{
locale = new Locale(language, country);
}
else
{
locale = new Locale(language);
}
_valueLocale = localeStr;
setValueDateFormat(DateFormat.getDateInstance(DateFormat.SHORT, locale));
setValueTimeFormat(DateFormat.getTimeInstance(DateFormat.SHORT, locale));
setValueNumberFormat(NumberFormat.getNumberInstance(locale));
return;
}
}
_valueLocale = null;
setValueDateFormat(null);
setValueTimeFormat(null);
setValueNumberFormat(null);
}
/**
* Returns the format object for formatting dates in the specified locale.
*
* @return The date format object or null if no locale is set
*/
protected DateFormat getValueDateFormat()
{
return _valueDateFormat;
}
/**
* Sets the format object for formatting dates in the specified locale.
*
* @param format The date format object
*/
protected void setValueDateFormat(DateFormat format)
{
_valueDateFormat = format;
}
/**
* Returns the format object for formatting times in the specified locale.
*
* @return The time format object or null if no locale is set
*/
protected DateFormat getValueTimeFormat()
{
return _valueTimeFormat;
}
/**
* Sets the date format object for formatting times in the specified locale.
*
* @param format The time format object
*/
protected void setValueTimeFormat(DateFormat format)
{
_valueTimeFormat = format;
}
/**
* Returns the format object for formatting numbers in the specified locale.
*
* @return The number format object or null if no locale is set
*/
protected NumberFormat getValueNumberFormat()
{
return _valueNumberFormat;
}
/**
* Returns a new date format object for formatting numbers in the specified locale.
* Platforms can override this if necessary.
*
* @param format The number format object
*/
protected void setValueNumberFormat(NumberFormat format)
{
_valueNumberFormat = format;
}
/**
* Adds a char sequence that needs escaping, and its escaped version.
*
* @param charSequence The char sequence
* @param escapedVersion The escaped version
*/
protected void addEscapedCharSequence(String charSequence, String escapedVersion)
{
_charSequencesToEscape.put(charSequence, escapedVersion);
}
/**
* Returns the maximum number of characters that a table name can have.
* This method is intended to give platform specific builder implementations
* more control over the maximum length.
*
* @return The number of characters, or -1 if not limited
*/
public int getMaxTableNameLength()
{
return getPlatformInfo().getMaxTableNameLength();
}
/**
* Returns the maximum number of characters that a column name can have.
* This method is intended to give platform specific builder implementations
* more control over the maximum length.
*
* @return The number of characters, or -1 if not limited
*/
public int getMaxColumnNameLength()
{
return getPlatformInfo().getMaxColumnNameLength();
}
/**
* Returns the maximum number of characters that a constraint name can have.
* This method is intended to give platform specific builder implementations
* more control over the maximum length.
*
* @return The number of characters, or -1 if not limited
*/
public int getMaxConstraintNameLength()
{
return getPlatformInfo().getMaxConstraintNameLength();
}
/**
* Returns the maximum number of characters that a foreign key name can have.
* This method is intended to give platform specific builder implementations
* more control over the maximum length.
*
* @return The number of characters, or -1 if not limited
*/
public int getMaxForeignKeyNameLength()
{
return getPlatformInfo().getMaxForeignKeyNameLength();
}
//
// public interface
//
/**
* Outputs the DDL required to drop and (re)create all tables in the database model.
*
* @param database The database model
*/
public void createTables(Database database) throws IOException
{
createTables(database, null, true);
}
/**
* Outputs the DDL required to drop (if requested) and (re)create all tables in the database model.
*
* @param database The database
* @param dropTables Whether to drop tables before creating them
*/
public void createTables(Database database, boolean dropTables) throws IOException
{
createTables(database, null, dropTables);
}
/**
* Outputs the DDL required to drop (if requested) and (re)create all tables in the database model.
*
* @param database The database
* @param params The parameters used in the creation
* @param dropTables Whether to drop tables before creating them
*/
public void createTables(Database database, CreationParameters params, boolean dropTables) throws IOException
{
if (dropTables)
{
dropTables(database);
}
for (int idx = 0; idx < database.getTableCount(); idx++)
{
Table table = database.getTable(idx);
writeTableComment(table);
createTable(database,
table,
params == null ? null : params.getParametersFor(table));
}
// we're writing the external foreignkeys last to ensure that all referenced tables are already defined
createExternalForeignKeys(database);
}
/**
* Generates the DDL to modify an existing database so the schema matches
* the specified database schema by using drops, modifications and additions.
* Database-specific implementations can change aspect of this algorithm by
* redefining the individual methods that compromise it.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
*/
public void alterDatabase(Database currentModel, Database desiredModel, CreationParameters params) throws IOException
{
ModelComparator comparator = new ModelComparator(getPlatformInfo(),
getPlatform().isDelimitedIdentifierModeOn());
List changes = comparator.compare(currentModel, desiredModel);
processChanges(currentModel, desiredModel, changes, params);
}
public boolean isAlterDatabase(Database currentModel, Database desiredModel, CreationParameters params) throws IOException
{
ModelComparator comparator = new ModelComparator(getPlatformInfo(),
getPlatform().isDelimitedIdentifierModeOn());
List changes = comparator.compare(currentModel, desiredModel);
return changes.size() > 0;
}
/**
* Calls the given closure for all changes that are of one of the given types, and
* then removes them from the changes collection.
*
* @param changes The changes
* @param changeTypes The types to search for
* @param closure The closure to invoke
*/
protected void applyForSelectedChanges(Collection changes, Class[] changeTypes, final Closure closure)
{
final Predicate predicate = new MultiInstanceofPredicate(changeTypes);
// basically we filter the changes for all objects where the above predicate
// returns true, and for these filtered objects we invoke the given closure
CollectionUtils.filter(changes,
new Predicate()
{
public boolean evaluate(Object obj)
{
if (predicate.evaluate(obj))
{
closure.execute(obj);
return false;
}
else
{
return true;
}
}
});
}
/**
* Processes the changes. The default argument performs several passes:
*
* - {@link org.jumpmind.symmetric.ddl.alteration.RemoveForeignKeyChange} and
* {@link org.jumpmind.symmetric.ddl.alteration.RemoveIndexChange} come first
* to allow for e.g. subsequent primary key changes or column removal.
* - {@link org.jumpmind.symmetric.ddl.alteration.RemoveTableChange}
* comes after the removal of foreign keys and indices.
* - These are all handled together:
* {@link org.jumpmind.symmetric.ddl.alteration.RemovePrimaryKeyChange}
* {@link org.jumpmind.symmetric.ddl.alteration.AddPrimaryKeyChange}
* {@link org.jumpmind.symmetric.ddl.alteration.PrimaryKeyChange}
* {@link org.jumpmind.symmetric.ddl.alteration.RemoveColumnChange}
* {@link org.jumpmind.symmetric.ddl.alteration.AddColumnChange}
* {@link org.jumpmind.symmetric.ddl.alteration.ColumnAutoIncrementChange}
* {@link org.jumpmind.symmetric.ddl.alteration.ColumnDefaultValueChange}
* {@link org.jumpmind.symmetric.ddl.alteration.ColumnRequiredChange}
* {@link org.jumpmind.symmetric.ddl.alteration.ColumnDataTypeChange}
* {@link org.jumpmind.symmetric.ddl.alteration.ColumnSizeChange}
* The reason for this is that the default algorithm rebuilds the table for these
* changes and thus their order is irrelevant.
* - {@link org.jumpmind.symmetric.ddl.alteration.AddTableChange}
* needs to come after the table removal (so that tables of the same name are
* removed) and before the addition of foreign keys etc.
* - {@link org.jumpmind.symmetric.ddl.alteration.AddForeignKeyChange} and
* {@link org.jumpmind.symmetric.ddl.alteration.AddIndexChange} come last
* after table/column/primary key additions or changes.
*
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param changes The changes
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
*/
protected void processChanges(Database currentModel,
Database desiredModel,
List changes,
CreationParameters params) throws IOException
{
CallbackClosure callbackClosure = new CallbackClosure(this,
"processChange",
new Class[] { Database.class, Database.class, CreationParameters.class, null },
new Object[] { currentModel, desiredModel, params, null });
// 1st pass: removing external constraints and indices
applyForSelectedChanges(changes,
new Class[] { RemoveForeignKeyChange.class,
RemoveIndexChange.class },
callbackClosure);
// 2nd pass: removing tables
applyForSelectedChanges(changes,
new Class[] { RemoveTableChange.class },
callbackClosure);
// 3rd pass: changing the structure of tables
Predicate predicate = new MultiInstanceofPredicate(new Class[] { RemovePrimaryKeyChange.class,
AddPrimaryKeyChange.class,
PrimaryKeyChange.class,
RemoveColumnChange.class,
AddColumnChange.class,
ColumnAutoIncrementChange.class,
ColumnDefaultValueChange.class,
ColumnRequiredChange.class,
ColumnDataTypeChange.class,
ColumnSizeChange.class });
processTableStructureChanges(currentModel,
desiredModel,
params,
CollectionUtils.select(changes, predicate));
// 4th pass: adding tables
applyForSelectedChanges(changes,
new Class[] { AddTableChange.class },
callbackClosure);
// 5th pass: adding external constraints and indices
applyForSelectedChanges(changes,
new Class[] { AddForeignKeyChange.class,
AddIndexChange.class },
callbackClosure);
}
/**
* This is a fall-through callback which generates a warning because a specific
* change type wasn't handled.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
* @param change The change object
*/
protected void processChange(Database currentModel,
Database desiredModel,
CreationParameters params,
ModelChange change) throws IOException
{
_log.warn("Change of type " + change.getClass() + " was not handled");
}
/**
* Processes the change representing the removal of a foreign key.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
* @param change The change object
*/
protected void processChange(Database currentModel,
Database desiredModel,
CreationParameters params,
RemoveForeignKeyChange change) throws IOException
{
writeExternalForeignKeyDropStmt(change.getChangedTable(), change.getForeignKey());
change.apply(currentModel, getPlatform().isDelimitedIdentifierModeOn());
}
/**
* Processes the change representing the removal of an index.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
* @param change The change object
*/
protected void processChange(Database currentModel,
Database desiredModel,
CreationParameters params,
RemoveIndexChange change) throws IOException
{
writeExternalIndexDropStmt(change.getChangedTable(), change.getIndex());
change.apply(currentModel, getPlatform().isDelimitedIdentifierModeOn());
}
/**
* Processes the change representing the removal of a table.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
* @param change The change object
*/
protected void processChange(Database currentModel,
Database desiredModel,
CreationParameters params,
RemoveTableChange change) throws IOException
{
dropTable(change.getChangedTable());
change.apply(currentModel, getPlatform().isDelimitedIdentifierModeOn());
}
/**
* Processes the change representing the addition of a table.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
* @param change The change object
*/
protected void processChange(Database currentModel,
Database desiredModel,
CreationParameters params,
AddTableChange change) throws IOException
{
createTable(desiredModel, change.getNewTable(), params == null ? null : params.getParametersFor(change.getNewTable()));
change.apply(currentModel, getPlatform().isDelimitedIdentifierModeOn());
}
/**
* Processes the change representing the addition of a foreign key.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
* @param change The change object
*/
protected void processChange(Database currentModel,
Database desiredModel,
CreationParameters params,
AddForeignKeyChange change) throws IOException
{
writeExternalForeignKeyCreateStmt(desiredModel,
change.getChangedTable(),
change.getNewForeignKey());
change.apply(currentModel, getPlatform().isDelimitedIdentifierModeOn());
}
/**
* Processes the change representing the addition of an index.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
* @param change The change object
*/
protected void processChange(Database currentModel,
Database desiredModel,
CreationParameters params,
AddIndexChange change) throws IOException
{
writeExternalIndexCreateStmt(change.getChangedTable(), change.getNewIndex());
change.apply(currentModel, getPlatform().isDelimitedIdentifierModeOn());
}
/**
* Processes the changes to the structure of tables.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param params The parameters used in the creation of new tables. Note that for existing
* tables, the parameters won't be applied
* @param changes The change objects
*/
protected void processTableStructureChanges(Database currentModel,
Database desiredModel,
CreationParameters params,
Collection changes) throws IOException
{
ListOrderedMap changesPerTable = new ListOrderedMap();
ListOrderedMap unchangedFKs = new ListOrderedMap();
boolean caseSensitive = getPlatform().isDelimitedIdentifierModeOn();
// we first sort the changes for the tables
// however since the changes might contain source or target tables
// we use the names rather than the table objects
for (Iterator changeIt = changes.iterator(); changeIt.hasNext();)
{
TableChange change = changeIt.next();
String name = change.getChangedTable().getName();
if (!caseSensitive)
{
name = name.toUpperCase();
}
List changesForTable = (List)changesPerTable.get(name);
if (changesForTable == null)
{
changesForTable = new ArrayList();
changesPerTable.put(name, changesForTable);
unchangedFKs.put(name, getUnchangedForeignKeys(currentModel, desiredModel, name));
}
changesForTable.add(change);
}
// we also need to drop the foreign keys of the unchanged tables referencing the changed tables
addRelevantFKsFromUnchangedTables(currentModel, desiredModel, changesPerTable.keySet(), unchangedFKs);
// we're dropping the unchanged foreign keys
for (Iterator tableFKIt = unchangedFKs.entrySet().iterator(); tableFKIt.hasNext();)
{
Map.Entry entry = (Map.Entry)tableFKIt.next();
Table targetTable = desiredModel.findTable((String)entry.getKey(), caseSensitive);
for (Iterator fkIt = ((List)entry.getValue()).iterator(); fkIt.hasNext();)
{
writeExternalForeignKeyDropStmt(targetTable, (ForeignKey)fkIt.next());
}
}
// We're using a copy of the current model so that the table structure changes can
// modify it
Database copyOfCurrentModel = null;
try
{
copyOfCurrentModel = (Database)currentModel.clone();
}
catch (CloneNotSupportedException ex)
{
throw new DdlUtilsException(ex);
}
for (Iterator tableChangeIt = changesPerTable.entrySet().iterator(); tableChangeIt.hasNext();)
{
Map.Entry entry = (Map.Entry)tableChangeIt.next();
Table targetTable = desiredModel.findTable((String)entry.getKey(), caseSensitive);
processTableStructureChanges(copyOfCurrentModel,
desiredModel,
(String)entry.getKey(),
params == null ? null : params.getParametersFor(targetTable),
(List)entry.getValue());
}
// and finally we're re-creating the unchanged foreign keys
for (Iterator tableFKIt = unchangedFKs.entrySet().iterator(); tableFKIt.hasNext();)
{
Map.Entry entry = (Map.Entry)tableFKIt.next();
Table targetTable = desiredModel.findTable((String)entry.getKey(), caseSensitive);
for (Iterator fkIt = ((List)entry.getValue()).iterator(); fkIt.hasNext();)
{
writeExternalForeignKeyCreateStmt(desiredModel, targetTable, (ForeignKey)fkIt.next());
}
}
}
/**
* Determines the unchanged foreign keys of the indicated table.
*
* @param currentModel The current model
* @param desiredModel The desired model
* @param tableName The name of the table
* @return The list of unchanged foreign keys
*/
private List getUnchangedForeignKeys(Database currentModel,
Database desiredModel,
String tableName)
{
ArrayList unchangedFKs = new ArrayList();
boolean caseSensitive = getPlatform().isDelimitedIdentifierModeOn();
Table sourceTable = currentModel.findTable(tableName, caseSensitive);
Table targetTable = desiredModel.findTable(tableName, caseSensitive);
for (int idx = 0; idx < targetTable.getForeignKeyCount(); idx++)
{
ForeignKey targetFK = targetTable.getForeignKey(idx);
ForeignKey sourceFK = sourceTable.findForeignKey(targetFK, caseSensitive);
if (sourceFK != null)
{
unchangedFKs.add(targetFK);
}
}
return unchangedFKs;
}
/**
* Adds the foreign keys of the unchanged tables that reference changed tables
* to the given map.
*
* @param currentModel The current model
* @param desiredModel The desired model
* @param namesOfKnownChangedTables The known names of changed tables
* @param fksPerTable The map table name -> foreign keys to which
* found foreign keys will be added to
*/
private void addRelevantFKsFromUnchangedTables(Database currentModel,
Database desiredModel,
Set namesOfKnownChangedTables,
Map fksPerTable)
{
boolean caseSensitive = getPlatform().isDelimitedIdentifierModeOn();
for (int tableIdx = 0; tableIdx < desiredModel.getTableCount(); tableIdx++)
{
Table targetTable = desiredModel.getTable(tableIdx);
String name = targetTable.getName();
Table sourceTable = currentModel.findTable(name, caseSensitive);
List relevantFks = null;
if (!caseSensitive)
{
name = name.toUpperCase();
}
if ((sourceTable != null) && !namesOfKnownChangedTables.contains(name))
{
for (int fkIdx = 0; fkIdx < targetTable.getForeignKeyCount(); fkIdx++)
{
ForeignKey targetFk = targetTable.getForeignKey(fkIdx);
ForeignKey sourceFk = sourceTable.findForeignKey(targetFk, caseSensitive);
String refName = targetFk.getForeignTableName();
if (!caseSensitive)
{
refName = refName.toUpperCase();
}
if ((sourceFk != null) && namesOfKnownChangedTables.contains(refName))
{
if (relevantFks == null)
{
relevantFks = new ArrayList();
fksPerTable.put(name, relevantFks);
}
relevantFks.add(targetFk);
}
}
}
}
}
/**
* Processes the changes to the structure of a single table. Database-specific
* implementations might redefine this method, but it is usually sufficient to
* redefine the {@link #processTableStructureChanges(Database, Database, Table, Table, Map, List)}
* method instead.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param tableName The name of the changed table
* @param parameters The creation parameters for the desired table
* @param changes The change objects for this table
*/
protected void processTableStructureChanges(Database currentModel,
Database desiredModel,
String tableName,
Map parameters,
List changes) throws IOException
{
Table sourceTable = currentModel.findTable(tableName, getPlatform().isDelimitedIdentifierModeOn());
Table targetTable = desiredModel.findTable(tableName, getPlatform().isDelimitedIdentifierModeOn());
// we're enforcing a full rebuild in case of the addition of a required
// column without a default value that is not autoincrement
boolean requiresFullRebuild = false;
for (Iterator changeIt = changes.iterator(); !requiresFullRebuild && changeIt.hasNext();)
{
TableChange change = (TableChange)changeIt.next();
if (change instanceof AddColumnChange)
{
AddColumnChange addColumnChange = (AddColumnChange)change;
if (addColumnChange.getNewColumn().isRequired() &&
(addColumnChange.getNewColumn().getDefaultValue() == null) &&
!addColumnChange.getNewColumn().isAutoIncrement())
{
requiresFullRebuild = true;
}
}
}
if (!requiresFullRebuild)
{
processTableStructureChanges(currentModel, desiredModel, sourceTable, targetTable, parameters, changes);
}
if (!changes.isEmpty())
{
// we can only copy the data if no required columns without default value and
// non-autoincrement have been added
boolean canMigrateData = true;
for (Iterator it = changes.iterator(); canMigrateData && it.hasNext();)
{
TableChange change = (TableChange)it.next();
if (change instanceof AddColumnChange)
{
AddColumnChange addColumnChange = (AddColumnChange)change;
if (addColumnChange.getNewColumn().isRequired() &&
!addColumnChange.getNewColumn().isAutoIncrement() &&
(addColumnChange.getNewColumn().getDefaultValue() == null))
{
_log.warn("Data cannot be retained in table " + change.getChangedTable().getName() +
" because of the addition of the required column " + addColumnChange.getNewColumn().getName());
canMigrateData = false;
}
}
}
Table realTargetTable = getRealTargetTableFor(desiredModel, sourceTable, targetTable);
if (canMigrateData)
{
Table tempTable = getTemporaryTableFor(desiredModel, targetTable);
createTemporaryTable(desiredModel, tempTable, parameters);
writeCopyDataStatement(sourceTable, tempTable);
// Note that we don't drop the indices here because the DROP TABLE will take care of that
// Likewise, foreign keys have already been dropped as necessary
dropTable(sourceTable);
createTable(desiredModel, realTargetTable, parameters);
writeCopyDataStatement(tempTable, targetTable);
dropTemporaryTable(desiredModel, tempTable);
writeFixLastIdentityValues(targetTable);
}
else
{
dropTable(sourceTable);
createTable(desiredModel, realTargetTable, parameters);
}
}
}
/**
* Allows database-specific implementations to handle changes in a database
* specific manner. Any handled change should be applied to the given current
* model (which is a copy of the real original model) and be removed from the
* list of changes.
* In the default implementation, all {@link AddPrimaryKeyChange} changes are
* applied via an ALTER TABLE ADD CONSTRAINT statement.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param sourceTable The original table
* @param targetTable The desired table
* @param parameters The creation parameters for the table
* @param changes The change objects for the target table
*/
protected void processTableStructureChanges(Database currentModel,
Database desiredModel,
Table sourceTable,
Table targetTable,
Map parameters,
List changes) throws IOException
{
if (changes.size() == 1)
{
TableChange change = (TableChange)changes.get(0);
if (change instanceof AddPrimaryKeyChange)
{
processChange(currentModel, desiredModel, (AddPrimaryKeyChange)change);
changes.clear();
}
}
}
/**
* Creates a temporary table object that corresponds to the given table.
* Database-specific implementations may redefine this method if e.g. the
* database directly supports temporary tables. The default implementation
* simply appends an underscore to the table name and uses that as the
* table name.
*
* @param targetModel The target database
* @param targetTable The target table
* @return The temporary table
*/
protected Table getTemporaryTableFor(Database targetModel, Table targetTable) throws IOException
{
return getTemporaryTableFor(targetModel, targetTable, "_");
}
public Table getBackupTableFor(Database model, Table sourceTable) throws IOException
{
return getTemporaryTableFor(model, sourceTable, "x");
}
public Table createBackupTableFor(Database model, Table sourceTable) throws IOException
{
Table backupTable = getBackupTableFor(model, sourceTable);
writeTableCreationStmt(model, backupTable, null);
printEndOfStatement();
writeCopyDataStatement(sourceTable, backupTable);
return backupTable;
}
public void restoreTableFromBackup(Table backupTable, Table targetTable, ListOrderedMap columnMap) throws IOException
{
print("DELETE FROM ");
printIdentifier(getTableName(targetTable));
printEndOfStatement();
writeCopyDataStatement(backupTable, targetTable, columnMap);
}
protected Table getTemporaryTableFor(Database targetModel, Table targetTable, String suffix) throws IOException
{
Table table = new Table();
table.setCatalog(targetTable.getCatalog());
table.setSchema(targetTable.getSchema());
table.setName(targetTable.getName() + suffix);
table.setType(targetTable.getType());
for (int idx = 0; idx < targetTable.getColumnCount(); idx++)
{
try
{
table.addColumn((Column)targetTable.getColumn(idx).clone());
}
catch (CloneNotSupportedException ex)
{
throw new DdlUtilsException(ex);
}
}
return table;
}
/**
* Outputs the DDL to create the given temporary table. Per default this is simply
* a call to {@link #createTable(Database, Table, Map)}.
*
* @param database The database model
* @param table The table
* @param parameters Additional platform-specific parameters for the table creation
*/
protected void createTemporaryTable(Database database, Table table, Map parameters) throws IOException
{
createTable(database, table, parameters);
}
/**
* Outputs the DDL to drop the given temporary table. Per default this is simply
* a call to {@link #dropTable(Table)}.
*
* @param database The database model
* @param table The table
*/
protected void dropTemporaryTable(Database database, Table table) throws IOException
{
dropTable(table);
}
/**
* Creates the target table object that differs from the given target table only in the
* indices. More specifically, only those indices are used that have not changed.
*
* @param targetModel The target database
* @param sourceTable The source table
* @param targetTable The target table
* @return The table
*/
protected Table getRealTargetTableFor(Database targetModel, Table sourceTable, Table targetTable) throws IOException
{
Table table = new Table();
table.setCatalog(targetTable.getCatalog());
table.setSchema(targetTable.getSchema());
table.setName(targetTable.getName());
table.setType(targetTable.getType());
for (int idx = 0; idx < targetTable.getColumnCount(); idx++)
{
try
{
table.addColumn((Column)targetTable.getColumn(idx).clone());
}
catch (CloneNotSupportedException ex)
{
throw new DdlUtilsException(ex);
}
}
boolean caseSensitive = getPlatform().isDelimitedIdentifierModeOn();
for (int idx = 0; idx < targetTable.getIndexCount(); idx++)
{
Index targetIndex = targetTable.getIndex(idx);
Index sourceIndex = sourceTable.findIndex(targetIndex.getName(), caseSensitive);
if (sourceIndex != null)
{
if ((caseSensitive && sourceIndex.equals(targetIndex)) ||
(!caseSensitive && sourceIndex.equalsIgnoreCase(targetIndex)))
{
table.addIndex(targetIndex);
}
}
}
return table;
}
/**
* Writes a statement that copies the data from the source to the target table. Note
* that this copies only those columns that are in both tables.
* Database-specific implementations might redefine this method though they usually
* it suffices to redefine the {@link #writeCastExpression(Column, Column)} method.
*
* @param sourceTable The source table
* @param targetTable The target table
*/
public void writeCopyDataStatement(Table sourceTable, Table targetTable) throws IOException
{
ListOrderedMap columnMap = getCopyDataColumnMapping(sourceTable, targetTable);
writeCopyDataStatement(sourceTable, targetTable, columnMap);
}
public void writeCopyDataStatement(Table sourceTable, Table targetTable, ListOrderedMap columnMap) throws IOException
{
print("INSERT INTO ");
printIdentifier(getTableName(targetTable));
print(" (");
for (Iterator columnIt = columnMap.values().iterator(); columnIt.hasNext();)
{
printIdentifier(getColumnName((Column)columnIt.next()));
if (columnIt.hasNext())
{
print(",");
}
}
print(") SELECT ");
for (Iterator columnsIt = columnMap.entrySet().iterator(); columnsIt.hasNext();)
{
Map.Entry entry = (Map.Entry)columnsIt.next();
writeCastExpression((Column)entry.getKey(),
(Column)entry.getValue());
if (columnsIt.hasNext())
{
print(",");
}
}
print(" FROM ");
printIdentifier(getTableName(sourceTable));
printEndOfStatement();
}
public ListOrderedMap getCopyDataColumnMapping(Table sourceTable, Table targetTable)
{
ListOrderedMap columns = new ListOrderedMap();
for (int idx = 0; idx < sourceTable.getColumnCount(); idx++)
{
Column sourceColumn = sourceTable.getColumn(idx);
Column targetColumn = targetTable.findColumn(sourceColumn.getName(),
getPlatform().isDelimitedIdentifierModeOn());
if (targetColumn != null)
{
columns.put(sourceColumn, targetColumn);
}
}
return columns;
}
public ListOrderedMap getCopyDataColumnOrderedMapping(Table sourceTable, Table targetTable)
{
ListOrderedMap columns = new ListOrderedMap();
for (int idx = 0; idx < sourceTable.getColumnCount(); idx++)
{
columns.put(sourceTable.getColumn(idx), targetTable.getColumn(idx));
}
return columns;
}
/**
* Writes a cast expression that converts the value of the source column to the data type
* of the target column. Per default, simply the name of the source column is written
* thereby assuming that any casts happen implicitly.
*
* @param sourceColumn The source column
* @param targetColumn The target column
*/
protected void writeCastExpression(Column sourceColumn, Column targetColumn) throws IOException
{
printIdentifier(getColumnName(sourceColumn));
}
/**
* Processes the addition of a primary key to a table.
*
* @param currentModel The current database schema
* @param desiredModel The desired database schema
* @param change The change object
*/
protected void processChange(Database currentModel,
Database desiredModel,
AddPrimaryKeyChange change) throws IOException
{
writeExternalPrimaryKeysCreateStmt(change.getChangedTable(), change.getPrimaryKeyColumns());
change.apply(currentModel, getPlatform().isDelimitedIdentifierModeOn());
}
/**
* Searches in the given table for a corresponding foreign key. If the given key
* has no name, then a foreign key to the same table with the same columns in the
* same order is searched. If the given key has a name, then the a corresponding
* key also needs to have the same name, or no name at all, but not a different one.
*
* @param table The table to search in
* @param fk The original foreign key
* @return The corresponding foreign key if found
*/
protected ForeignKey findCorrespondingForeignKey(Table table, ForeignKey fk)
{
boolean caseMatters = getPlatform().isDelimitedIdentifierModeOn();
boolean checkFkName = (fk.getName() != null) && (fk.getName().length() > 0);
Reference[] refs = fk.getReferences();
ArrayList curRefs = new ArrayList();
for (int fkIdx = 0; fkIdx < table.getForeignKeyCount(); fkIdx++)
{
ForeignKey curFk = table.getForeignKey(fkIdx);
boolean checkCurFkName = checkFkName &&
(curFk.getName() != null) && (curFk.getName().length() > 0);
if ((!checkCurFkName || areEqual(fk.getName(), curFk.getName(), caseMatters)) &&
areEqual(fk.getForeignTableName(), curFk.getForeignTableName(), caseMatters))
{
curRefs.clear();
CollectionUtils.addAll(curRefs, curFk.getReferences());
// the order is not fixed, so we have to take this long way
if (curRefs.size() == refs.length)
{
for (int refIdx = 0; refIdx < refs.length; refIdx++)
{
boolean found = false;
for (int curRefIdx = 0; !found && (curRefIdx < curRefs.size()); curRefIdx++)
{
Reference curRef = (Reference)curRefs.get(curRefIdx);
if ((caseMatters && refs[refIdx].equals(curRef)) ||
(!caseMatters && refs[refIdx].equalsIgnoreCase(curRef)))
{
curRefs.remove(curRefIdx);
found = true;
}
}
}
if (curRefs.isEmpty())
{
return curFk;
}
}
}
}
return null;
}
/**
* Compares the two strings.
*
* @param string1 The first string
* @param string2 The second string
* @param caseMatters Whether case matters in the comparison
* @return true if the string are equal
*/
protected boolean areEqual(String string1, String string2, boolean caseMatters)
{
return (caseMatters && string1.equals(string2)) ||
(!caseMatters && string1.equalsIgnoreCase(string2));
}
/**
* Outputs the DDL to create the table along with any non-external constraints as well
* as with external primary keys and indices (but not foreign keys).
*
* @param database The database model
* @param table The table
*/
public void createTable(Database database, Table table) throws IOException
{
createTable(database, table, null);
}
/**
* Outputs the DDL to create the table along with any non-external constraints as well
* as with external primary keys and indices (but not foreign keys).
*
* @param database The database model
* @param table The table
* @param parameters Additional platform-specific parameters for the table creation
*/
public void createTable(Database database, Table table, Map parameters) throws IOException
{
writeTableCreationStmt(database, table, parameters);
writeTableCreationStmtEnding(table, parameters);
if (!getPlatformInfo().isPrimaryKeyEmbedded())
{
writeExternalPrimaryKeysCreateStmt(table, table.getPrimaryKeyColumns());
}
if (!getPlatformInfo().isIndicesEmbedded())
{
writeExternalIndicesCreateStmt(table);
}
}
/**
* Creates the external foreignkey creation statements for all tables in the database.
*
* @param database The database
*/
public void createExternalForeignKeys(Database database) throws IOException
{
for (int idx = 0; idx < database.getTableCount(); idx++)
{
createExternalForeignKeys(database, database.getTable(idx));
}
}
/**
* Creates external foreignkey creation statements if necessary.
*
* @param database The database model
* @param table The table
*/
public void createExternalForeignKeys(Database database, Table table) throws IOException
{
if (!getPlatformInfo().isForeignKeysEmbedded())
{
for (int idx = 0; idx < table.getForeignKeyCount(); idx++)
{
writeExternalForeignKeyCreateStmt(database, table, table.getForeignKey(idx));
}
}
}
/**
* Outputs the DDL required to drop the database.
*
* @param database The database
*/
public void dropTables(Database database) throws IOException
{
// we're dropping the external foreignkeys first
for (int idx = database.getTableCount() - 1; idx >= 0; idx--)
{
Table table = database.getTable(idx);
if ((table.getName() != null) &&
(table.getName().length() > 0))
{
dropExternalForeignKeys(table);
}
}
// Next we drop the tables in reverse order to avoid referencial problems
// TODO: It might be more useful to either (or both)
// * determine an order in which the tables can be dropped safely (via the foreignkeys)
// * alter the tables first to drop the internal foreignkeys
for (int idx = database.getTableCount() - 1; idx >= 0; idx--)
{
Table table = database.getTable(idx);
if ((table.getName() != null) &&
(table.getName().length() > 0))
{
writeTableComment(table);
dropTable(table);
}
}
}
/**
* Outputs the DDL required to drop the given table. This method also
* drops foreign keys to the table.
*
* @param database The database
* @param table The table
*/
public void dropTable(Database database, Table table) throws IOException
{
// we're dropping the foreignkeys to the table first
for (int idx = database.getTableCount() - 1; idx >= 0; idx--)
{
Table otherTable = database.getTable(idx);
ForeignKey[] fks = otherTable.getForeignKeys();
for (int fkIdx = 0; (fks != null) && (fkIdx < fks.length); fkIdx++)
{
if (fks[fkIdx].getForeignTable().equals(table))
{
writeExternalForeignKeyDropStmt(otherTable, fks[fkIdx]);
}
}
}
// and the foreign keys from the table
dropExternalForeignKeys(table);
writeTableComment(table);
dropTable(table);
}
/**
* Outputs the DDL to drop the table. Note that this method does not drop
* foreign keys to this table. Use {@link #dropTable(Database, Table)}
* if you want that.
*
* @param table The table to drop
*/
public void dropTable(Table table) throws IOException
{
print("DROP TABLE ");
printIdentifier(getTableName(table));
printEndOfStatement();
}
/**
* Creates external foreignkey drop statements.
*
* @param table The table
*/
public void dropExternalForeignKeys(Table table) throws IOException
{
if (!getPlatformInfo().isForeignKeysEmbedded())
{
for (int idx = 0; idx < table.getForeignKeyCount(); idx++)
{
writeExternalForeignKeyDropStmt(table, table.getForeignKey(idx));
}
}
}
/**
* Creates the SQL for inserting an object into the specified table.
* If values are given then a concrete insert statement is created, otherwise an
* insert statement usable in a prepared statement is build.
*
* @param table The table
* @param columnValues The columns values indexed by the column names
* @param genPlaceholders Whether to generate value placeholders for a
* prepared statement
* @return The insertion sql
*/
public String getInsertSql(Table table, Map columnValues, boolean genPlaceholders)
{
StringBuffer buffer = new StringBuffer("INSERT INTO ");
boolean addComma = false;
buffer.append(getDelimitedIdentifier(getTableName(table)));
buffer.append(" (");
for (int idx = 0; idx < table.getColumnCount(); idx++)
{
Column column = table.getColumn(idx);
if (columnValues.containsKey(column.getName()))
{
if (addComma)
{
buffer.append(", ");
}
buffer.append(getDelimitedIdentifier(column.getName()));
addComma = true;
}
}
buffer.append(") VALUES (");
if (genPlaceholders)
{
addComma = false;
for (int idx = 0; idx < columnValues.size(); idx++)
{
if (addComma)
{
buffer.append(", ");
}
buffer.append("?");
addComma = true;
}
}
else
{
addComma = false;
for (int idx = 0; idx < table.getColumnCount(); idx++)
{
Column column = table.getColumn(idx);
if (columnValues.containsKey(column.getName()))
{
if (addComma)
{
buffer.append(", ");
}
buffer.append(getValueAsString(column, columnValues.get(column.getName())));
addComma = true;
}
}
}
buffer.append(")");
return buffer.toString();
}
/**
* Creates the SQL for updating an object in the specified table.
* If values are given then a concrete update statement is created, otherwise an
* update statement usable in a prepared statement is build.
*
* @param table The table
* @param columnValues Contains the values for the columns to update, and should also
* contain the primary key values to identify the object to update
* in case genPlaceholders is false
* @param genPlaceholders Whether to generate value placeholders for a
* prepared statement (both for the pk values and the object values)
* @return The update sql
*/
public String getUpdateSql(Table table, Map columnValues, boolean genPlaceholders)
{
StringBuffer buffer = new StringBuffer("UPDATE ");
boolean addSep = false;
buffer.append(getDelimitedIdentifier(getTableName(table)));
buffer.append(" SET ");
for (int idx = 0; idx < table.getColumnCount(); idx++)
{
Column column = table.getColumn(idx);
if (!column.isPrimaryKey() && columnValues.containsKey(column.getName()))
{
if (addSep)
{
buffer.append(", ");
}
buffer.append(getDelimitedIdentifier(column.getName()));
buffer.append(" = ");
if (genPlaceholders)
{
buffer.append("?");
}
else
{
buffer.append(getValueAsString(column, columnValues.get(column.getName())));
}
addSep = true;
}
}
buffer.append(" WHERE ");
addSep = false;
for (int idx = 0; idx < table.getColumnCount(); idx++)
{
Column column = table.getColumn(idx);
if (column.isPrimaryKey() && columnValues.containsKey(column.getName()))
{
if (addSep)
{
buffer.append(" AND ");
}
buffer.append(getDelimitedIdentifier(column.getName()));
buffer.append(" = ");
if (genPlaceholders)
{
buffer.append("?");
}
else
{
buffer.append(getValueAsString(column, columnValues.get(column.getName())));
}
addSep = true;
}
}
return buffer.toString();
}
/**
* Creates the SQL for deleting an object from the specified table.
* If values are given then a concrete delete statement is created, otherwise an
* delete statement usable in a prepared statement is build.
*
* @param table The table
* @param pkValues The primary key values indexed by the column names, can be empty
* @param genPlaceholders Whether to generate value placeholders for a
* prepared statement
* @return The delete sql
*/
public String getDeleteSql(Table table, Map pkValues, boolean genPlaceholders)
{
StringBuffer buffer = new StringBuffer("DELETE FROM ");
boolean addSep = false;
buffer.append(getDelimitedIdentifier(getTableName(table)));
if ((pkValues != null) && !pkValues.isEmpty())
{
buffer.append(" WHERE ");
for (Iterator it = pkValues.entrySet().iterator(); it.hasNext();)
{
Map.Entry entry = (Map.Entry)it.next();
Column column = table.findColumn((String)entry.getKey());
if (addSep)
{
buffer.append(" AND ");
}
buffer.append(getDelimitedIdentifier(entry.getKey().toString()));
buffer.append(" = ");
if (genPlaceholders)
{
buffer.append("?");
}
else
{
buffer.append(column == null ? entry.getValue() : getValueAsString(column, entry.getValue()));
}
addSep = true;
}
}
return buffer.toString();
}
/**
* Generates the string representation of the given value.
*
* @param column The column
* @param value The value
* @return The string representation
*/
protected String getValueAsString(Column column, Object value)
{
if (value == null)
{
return "NULL";
}
StringBuffer result = new StringBuffer();
// TODO: Handle binary types (BINARY, VARBINARY, LONGVARBINARY, BLOB)
switch (column.getTypeCode())
{
case Types.DATE:
result.append(getPlatformInfo().getValueQuoteToken());
if (!(value instanceof String) && (getValueDateFormat() != null))
{
// TODO: Can the format method handle java.sql.Date properly ?
result.append(getValueDateFormat().format(value));
}
else
{
result.append(value.toString());
}
result.append(getPlatformInfo().getValueQuoteToken());
break;
case Types.TIME:
result.append(getPlatformInfo().getValueQuoteToken());
if (!(value instanceof String) && (getValueTimeFormat() != null))
{
// TODO: Can the format method handle java.sql.Date properly ?
result.append(getValueTimeFormat().format(value));
}
else
{
result.append(value.toString());
}
result.append(getPlatformInfo().getValueQuoteToken());
break;
case Types.TIMESTAMP:
result.append(getPlatformInfo().getValueQuoteToken());
// TODO: SimpleDateFormat does not support nano seconds so we would
// need a custom date formatter for timestamps
result.append(value.toString());
result.append(getPlatformInfo().getValueQuoteToken());
break;
case Types.REAL:
case Types.NUMERIC:
case Types.FLOAT:
case Types.DOUBLE:
case Types.DECIMAL:
result.append(getPlatformInfo().getValueQuoteToken());
if (!(value instanceof String) && (getValueNumberFormat() != null))
{
result.append(getValueNumberFormat().format(value));
}
else
{
result.append(value.toString());
}
result.append(getPlatformInfo().getValueQuoteToken());
break;
default:
result.append(getPlatformInfo().getValueQuoteToken());
result.append(escapeStringValue(value.toString()));
result.append(getPlatformInfo().getValueQuoteToken());
break;
}
return result.toString();
}
/**
* Generates the SQL for querying the id that was created in the last insertion
* operation. This is obviously only useful for pk fields that are auto-incrementing.
* A database that does not support this, will return null.
*
* @param table The table
* @return The sql, or null if the database does not support this
*/
public String getSelectLastIdentityValues(Table table)
{
// No default possible as the databases are quite different in this respect
return null;
}
/**
* Generates the SQL to execute that sets the current sequence number.
*
* @param table
* @param id
* @return
*/
public String fixLastIdentityValues(Table table)
{
return null;
}
public void writeFixLastIdentityValues(Table table) throws IOException
{
String sql = fixLastIdentityValues(table);
if (sql != null) {
print(sql);
printEndOfStatement();
}
}
//
// implementation methods that may be overridden by specific database builders
//
/**
* Generates a version of the name that has at most the specified
* length.
*
* @param name The original name
* @param desiredLength The desired maximum length
* @return The shortened version
*/
public String shortenName(String name, int desiredLength)
{
// TODO: Find an algorithm that generates unique names
int originalLength = name.length();
if ((desiredLength <= 0) || (originalLength <= desiredLength))
{
return name;
}
int delta = originalLength - desiredLength;
int startCut = desiredLength / 2;
StringBuffer result = new StringBuffer();
result.append(name.substring(0, startCut));
if (((startCut == 0) || (name.charAt(startCut - 1) != '_')) &&
((startCut + delta + 1 == originalLength) || (name.charAt(startCut + delta + 1) != '_')))
{
// just to make sure that there isn't already a '_' right before or right
// after the cutting place (which would look odd with an aditional one)
result.append("_");
}
result.append(name.substring(startCut + delta + 1, originalLength));
return result.toString();
}
/**
* Returns the table name. This method takes care of length limitations imposed by some databases.
*
* @param table The table
* @return The table name
*/
public String getTableName(Table table)
{
return getTableName(table.getName());
}
public String getTableName(String tableName) {
return shortenName(tableName, getMaxTableNameLength());
}
/**
* Outputs a comment for the table.
*
* @param table The table
*/
protected void writeTableComment(Table table) throws IOException
{
printComment("-----------------------------------------------------------------------");
printComment(getTableName(table));
printComment("-----------------------------------------------------------------------");
println();
}
/**
* Generates the first part of the ALTER TABLE statement including the
* table name.
*
* @param table The table being altered
*/
protected void writeTableAlterStmt(Table table) throws IOException
{
print("ALTER TABLE ");
printlnIdentifier(getTableName(table));
printIndent();
}
/**
* Writes the table creation statement without the statement end.
*
* @param database The model
* @param table The table
* @param parameters Additional platform-specific parameters for the table creation
*/
protected void writeTableCreationStmt(Database database, Table table, Map parameters) throws IOException
{
print("CREATE TABLE ");
printlnIdentifier(getTableName(table));
println("(");
writeColumns(table);
if (getPlatformInfo().isPrimaryKeyEmbedded())
{
writeEmbeddedPrimaryKeysStmt(table);
}
if (getPlatformInfo().isForeignKeysEmbedded())
{
writeEmbeddedForeignKeysStmt(database, table);
}
if (getPlatformInfo().isIndicesEmbedded())
{
writeEmbeddedIndicesStmt(table);
}
println();
print(")");
}
/**
* Writes the end of the table creation statement. Per default,
* only the end of the statement is written, but this can be changed
* in subclasses.
*
* @param table The table
* @param parameters Additional platform-specific parameters for the table creation
*/
protected void writeTableCreationStmtEnding(Table table, Map parameters) throws IOException
{
printEndOfStatement();
}
/**
* Writes the columns of the given table.
*
* @param table The table
*/
protected void writeColumns(Table table) throws IOException
{
for (int idx = 0; idx < table.getColumnCount(); idx++)
{
printIndent();
writeColumn(table, table.getColumn(idx));
if (idx < table.getColumnCount() - 1)
{
println(",");
}
}
}
/**
* Returns the column name. This method takes care of length limitations imposed by some databases.
*
* @param column The column
* @return The column name
*/
protected String getColumnName(Column column) throws IOException
{
return shortenName(column.getName(), getMaxColumnNameLength());
}
/**
* Outputs the DDL for the specified column.
*
* @param table The table containing the column
* @param column The column
*/
protected void writeColumn(Table table, Column column) throws IOException
{
//see comments in columnsDiffer about null/"" defaults
printIdentifier(getColumnName(column));
print(" ");
print(getSqlType(column));
writeColumnDefaultValueStmt(table, column);
if (column.isRequired())
{
print(" ");
writeColumnNotNullableStmt();
}
else if (getPlatformInfo().isNullAsDefaultValueRequired() &&
getPlatformInfo().hasNullDefault(column.getTypeCode()))
{
print(" ");
writeColumnNullableStmt();
}
if (column.isAutoIncrement() && !getPlatformInfo().isDefaultValueUsedForIdentitySpec())
{
if (!getPlatformInfo().isNonPKIdentityColumnsSupported() && !column.isPrimaryKey())
{
throw new ModelException("Column "+column.getName()+" in table "+table.getName()+" is auto-incrementing but not a primary key column, which is not supported by the platform");
}
print(" ");
writeColumnAutoIncrementStmt(table, column);
}
}
/**
* Returns the full SQL type specification (including size and precision/scale) for the
* given column.
*
* @param column The column
* @return The full SQL type string including the size
*/
protected String getSqlType(Column column)
{
String nativeType = getNativeType(column);
int sizePos = nativeType.indexOf(SIZE_PLACEHOLDER);
StringBuffer sqlType = new StringBuffer();
sqlType.append(sizePos >= 0 ? nativeType.substring(0, sizePos) : nativeType);
Object sizeSpec = column.getSize();
if (sizeSpec == null)
{
sizeSpec = getPlatformInfo().getDefaultSize(column.getTypeCode());
}
if (sizeSpec != null)
{
if (getPlatformInfo().hasSize(column.getTypeCode()))
{
sqlType.append("(");
sqlType.append(sizeSpec.toString());
sqlType.append(")");
}
else if (getPlatformInfo().hasPrecisionAndScale(column.getTypeCode()))
{
sqlType.append("(");
sqlType.append(column.getSizeAsInt());
sqlType.append(",");
sqlType.append(column.getScale());
sqlType.append(")");
}
}
sqlType.append(sizePos >= 0 ? nativeType.substring(sizePos + SIZE_PLACEHOLDER.length()) : "");
return sqlType.toString();
}
/**
* Returns the database-native type for the given column.
*
* @param column The column
* @return The native type
*/
protected String getNativeType(Column column)
{
String nativeType = (String)getPlatformInfo().getNativeType(column.getTypeCode());
return nativeType == null ? column.getType() : nativeType;
}
/**
* Returns the bare database-native type for the given column without any size specifies.
*
* @param column The column
* @return The native type
*/
protected String getBareNativeType(Column column)
{
String nativeType = getNativeType(column);
int sizePos = nativeType.indexOf(SIZE_PLACEHOLDER);
return sizePos >= 0 ? nativeType.substring(0, sizePos) : nativeType;
}
/**
* Returns the native default value for the column.
*
* @param column The column
* @return The native default value
*/
protected String getNativeDefaultValue(Column column)
{
return column.getDefaultValue();
}
/**
* Escapes the necessary characters in given string value.
*
* @param value The value
* @return The corresponding string with the special characters properly escaped
*/
protected String escapeStringValue(String value)
{
String result = value;
for (Iterator it = _charSequencesToEscape.entrySet().iterator(); it.hasNext();)
{
Map.Entry entry = (Map.Entry)it.next();
result = StringUtils.replace(result, (String)entry.getKey(), (String)entry.getValue());
}
return result;
}
/**
* Determines whether the given default spec is a non-empty spec that shall be used in a DEFAULT
* expression. E.g. if the spec is an empty string and the type is a numeric type, then it is
* no valid default value whereas if it is a string type, then it is valid.
*
* @param defaultSpec The default value spec
* @param typeCode The JDBC type code
* @return true if the default value spec is valid
*/
protected boolean isValidDefaultValue(String defaultSpec, int typeCode)
{
return (defaultSpec != null) &&
((defaultSpec.length() > 0) ||
(!TypeMap.isNumericType(typeCode) && !TypeMap.isDateTimeType(typeCode)));
}
/**
* Prints the default value stmt part for the column.
*
* @param table The table
* @param column The column
*/
protected void writeColumnDefaultValueStmt(Table table, Column column) throws IOException
{
Object parsedDefault = column.getParsedDefaultValue();
if (parsedDefault != null)
{
if (!getPlatformInfo().isDefaultValuesForLongTypesSupported() &&
((column.getTypeCode() == Types.LONGVARBINARY) || (column.getTypeCode() == Types.LONGVARCHAR)))
{
throw new ModelException("The platform does not support default values for LONGVARCHAR or LONGVARBINARY columns");
}
// we write empty default value strings only if the type is not a numeric or date/time type
if (isValidDefaultValue(column.getDefaultValue(), column.getTypeCode()))
{
print(" DEFAULT ");
writeColumnDefaultValue(table, column);
}
}
else if (getPlatformInfo().isDefaultValueUsedForIdentitySpec() && column.isAutoIncrement())
{
print(" DEFAULT ");
writeColumnDefaultValue(table, column);
}
}
/**
* Prints the default value of the column.
*
* @param table The table
* @param column The column
*/
protected void writeColumnDefaultValue(Table table, Column column) throws IOException
{
printDefaultValue(getNativeDefaultValue(column), column.getTypeCode());
}
/**
* Prints the default value of the column.
*
* @param defaultValue The default value
* @param typeCode The type code to write the default value for
*/
protected void printDefaultValue(Object defaultValue, int typeCode) throws IOException
{
if (defaultValue != null)
{
boolean shouldUseQuotes = !TypeMap.isNumericType(typeCode);
if (shouldUseQuotes)
{
// characters are only escaped when within a string literal
print(getPlatformInfo().getValueQuoteToken());
print(escapeStringValue(defaultValue.toString()));
print(getPlatformInfo().getValueQuoteToken());
}
else
{
print(defaultValue.toString());
}
}
}
/**
* Prints that the column is an auto increment column.
*
* @param table The table
* @param column The column
*/
protected void writeColumnAutoIncrementStmt(Table table, Column column) throws IOException
{
print("IDENTITY");
}
/**
* Prints that a column is nullable.
*/
protected void writeColumnNullableStmt() throws IOException
{
print("NULL");
}
/**
* Prints that a column is not nullable.
*/
protected void writeColumnNotNullableStmt() throws IOException
{
print("NOT NULL");
}
/**
* Compares the current column in the database with the desired one.
* Type, nullability, size, scale, default value, and precision radix are
* the attributes checked. Currently default values are compared, and
* null and empty string are considered equal.
*
* @param currentColumn The current column as it is in the database
* @param desiredColumn The desired column
* @return true if the column specifications differ
*/
protected boolean columnsDiffer(Column currentColumn, Column desiredColumn)
{
//The createColumn method leaves off the default clause if column.getDefaultValue()
//is null. mySQL interprets this as a default of "" or 0, and thus the columns
//are always different according to this method. alterDatabase will generate
//an alter statement for the column, but it will be the exact same definition
//as before. In order to avoid this situation I am ignoring the comparison
//if the desired default is null. In order to "un-default" a column you'll
//have to have a default="" or default="0" in the schema xml.
//If this is bad for other databases, it is recommended that the createColumn
//method use a "DEFAULT NULL" statement if that is what is needed.
//A good way to get this would be to require a defaultValue="" in the
//schema xml if you really want null and not just unspecified.
String desiredDefault = desiredColumn.getDefaultValue();
String currentDefault = currentColumn.getDefaultValue();
boolean defaultsEqual = (desiredDefault == null) || desiredDefault.equals(currentDefault);
boolean sizeMatters = getPlatformInfo().hasSize(currentColumn.getTypeCode()) &&
(desiredColumn.getSize() != null);
// We're comparing the jdbc type that corresponds to the native type for the
// desired type, in order to avoid repeated altering of a perfectly valid column
if ((getPlatformInfo().getTargetJdbcType(desiredColumn.getTypeCode()) != currentColumn.getTypeCode()) ||
(desiredColumn.isRequired() != currentColumn.isRequired()) ||
(sizeMatters && !StringUtils.equals(desiredColumn.getSize(), currentColumn.getSize())) ||
!defaultsEqual)
{
return true;
}
else
{
return false;
}
}
/**
* Returns the name to be used for the given foreign key. If the foreign key has no
* specified name, this method determines a unique name for it. The name will also
* be shortened to honor the maximum identifier length imposed by the platform.
*
* @param table The table for whith the foreign key is defined
* @param fk The foreign key
* @return The name
*/
public String getForeignKeyName(Table table, ForeignKey fk)
{
String fkName = fk.getName();
boolean needsName = (fkName == null) || (fkName.length() == 0);
if (needsName)
{
StringBuffer name = new StringBuffer();
for (int idx = 0; idx < fk.getReferenceCount(); idx++)
{
name.append(fk.getReference(idx).getLocalColumnName());
name.append("_");
}
name.append(fk.getForeignTableName());
fkName = getConstraintName(null, table, "FK", name.toString());
}
fkName = shortenName(fkName, getMaxForeignKeyNameLength());
if (needsName)
{
_log.warn("Encountered a foreign key in table " + table.getName() + " that has no name. " +
"DdlUtils will use the auto-generated and shortened name " + fkName + " instead.");
}
return fkName;
}
/**
* Returns the constraint name. This method takes care of length limitations imposed by some databases.
*
* @param prefix The constraint prefix, can be null
* @param table The table that the constraint belongs to
* @param secondPart The second name part, e.g. the name of the constraint column
* @param suffix The constraint suffix, e.g. a counter (can be null)
* @return The constraint name
*/
public String getConstraintName(String prefix, Table table, String secondPart, String suffix)
{
StringBuffer result = new StringBuffer();
if (prefix != null)
{
result.append(prefix);
result.append("_");
}
result.append(table.getName());
result.append("_");
result.append(secondPart);
if (suffix != null)
{
result.append("_");
result.append(suffix);
}
return shortenName(result.toString(), getMaxConstraintNameLength());
}
/**
* Writes the primary key constraints of the table inside its definition.
*
* @param table The table
*/
protected void writeEmbeddedPrimaryKeysStmt(Table table) throws IOException
{
Column[] primaryKeyColumns = table.getPrimaryKeyColumns();
if ((primaryKeyColumns.length > 0) && shouldGeneratePrimaryKeys(primaryKeyColumns))
{
printStartOfEmbeddedStatement();
writePrimaryKeyStmt(table, primaryKeyColumns);
}
}
/**
* Writes the primary key constraints of the table as alter table statements.
*
* @param table The table
* @param primaryKeyColumns The primary key columns
*/
protected void writeExternalPrimaryKeysCreateStmt(Table table, Column[] primaryKeyColumns) throws IOException
{
if ((primaryKeyColumns.length > 0) && shouldGeneratePrimaryKeys(primaryKeyColumns))
{
print("ALTER TABLE ");
printlnIdentifier(getTableName(table));
printIndent();
print("ADD CONSTRAINT ");
printIdentifier(getConstraintName(null, table, "PK", null));
print(" ");
writePrimaryKeyStmt(table, primaryKeyColumns);
printEndOfStatement();
}
}
/**
* Determines whether we should generate a primary key constraint for the given
* primary key columns.
*
* @param primaryKeyColumns The pk columns
* @return true if a pk statement should be generated for the columns
*/
protected boolean shouldGeneratePrimaryKeys(Column[] primaryKeyColumns)
{
return true;
}
/**
* Writes a primary key statement for the given columns.
*
* @param table The table
* @param primaryKeyColumns The primary columns
*/
protected void writePrimaryKeyStmt(Table table, Column[] primaryKeyColumns) throws IOException
{
print("PRIMARY KEY (");
for (int idx = 0; idx < primaryKeyColumns.length; idx++)
{
printIdentifier(getColumnName(primaryKeyColumns[idx]));
if (idx < primaryKeyColumns.length - 1)
{
print(", ");
}
}
print(")");
}
/**
* Returns the index name. This method takes care of length limitations imposed by some databases.
*
* @param index The index
* @return The index name
*/
public String getIndexName(Index index)
{
return shortenName(index.getName(), getMaxConstraintNameLength());
}
/**
* Writes the indexes of the given table.
*
* @param table The table
*/
protected void writeExternalIndicesCreateStmt(Table table) throws IOException
{
for (int idx = 0; idx < table.getIndexCount(); idx++)
{
Index index = table.getIndex(idx);
if (!index.isUnique() && !getPlatformInfo().isIndicesSupported())
{
throw new ModelException("Platform does not support non-unique indices");
}
writeExternalIndexCreateStmt(table, index);
}
}
/**
* Writes the indexes embedded within the create table statement.
*
* @param table The table
*/
protected void writeEmbeddedIndicesStmt(Table table) throws IOException
{
if (getPlatformInfo().isIndicesSupported())
{
for (int idx = 0; idx < table.getIndexCount(); idx++)
{
printStartOfEmbeddedStatement();
writeEmbeddedIndexCreateStmt(table, table.getIndex(idx));
}
}
}
/**
* Writes the given index of the table.
*
* @param table The table
* @param index The index
*/
protected void writeExternalIndexCreateStmt(Table table, Index index) throws IOException
{
if (getPlatformInfo().isIndicesSupported())
{
if (index.getName() == null)
{
_log.warn("Cannot write unnamed index " + index);
}
else
{
print("CREATE");
if (index.isUnique())
{
print(" UNIQUE");
}
print(" INDEX ");
printIdentifier(getIndexName(index));
print(" ON ");
printIdentifier(getTableName(table));
print(" (");
for (int idx = 0; idx < index.getColumnCount(); idx++)
{
IndexColumn idxColumn = index.getColumn(idx);
Column col = table.findColumn(idxColumn.getName());
if (col == null)
{
// would get null pointer on next line anyway, so throw exception
throw new ModelException("Invalid column '" + idxColumn.getName() + "' on index " + index.getName() + " for table " + table.getName());
}
if (idx > 0)
{
print(", ");
}
printIdentifier(getColumnName(col));
}
print(")");
printEndOfStatement();
}
}
}
/**
* Writes the given embedded index of the table.
*
* @param table The table
* @param index The index
*/
protected void writeEmbeddedIndexCreateStmt(Table table, Index index) throws IOException
{
if ((index.getName() != null) && (index.getName().length() > 0))
{
print(" CONSTRAINT ");
printIdentifier(getIndexName(index));
}
if (index.isUnique())
{
print(" UNIQUE");
}
else
{
print(" INDEX ");
}
print(" (");
for (int idx = 0; idx < index.getColumnCount(); idx++)
{
IndexColumn idxColumn = index.getColumn(idx);
Column col = table.findColumn(idxColumn.getName());
if (col == null)
{
// would get null pointer on next line anyway, so throw exception
throw new ModelException("Invalid column '" + idxColumn.getName() + "' on index " + index.getName() + " for table " + table.getName());
}
if (idx > 0)
{
print(", ");
}
printIdentifier(getColumnName(col));
}
print(")");
}
/**
* Generates the statement to drop a non-embedded index from the database.
*
* @param table The table the index is on
* @param index The index to drop
*/
public void writeExternalIndexDropStmt(Table table, Index index) throws IOException
{
if (getPlatformInfo().isAlterTableForDropUsed())
{
writeTableAlterStmt(table);
}
print("DROP INDEX ");
printIdentifier(getIndexName(index));
if (!getPlatformInfo().isAlterTableForDropUsed())
{
print(" ON ");
printIdentifier(getTableName(table));
}
printEndOfStatement();
}
/**
* Writes the foreign key constraints inside a create table () clause.
*
* @param database The database model
* @param table The table
*/
protected void writeEmbeddedForeignKeysStmt(Database database, Table table) throws IOException
{
for (int idx = 0; idx < table.getForeignKeyCount(); idx++)
{
ForeignKey key = table.getForeignKey(idx);
if (key.getForeignTableName() == null)
{
_log.warn("Foreign key table is null for key " + key);
}
else
{
printStartOfEmbeddedStatement();
if (getPlatformInfo().isEmbeddedForeignKeysNamed())
{
print("CONSTRAINT ");
printIdentifier(getForeignKeyName(table, key));
print(" ");
}
print("FOREIGN KEY (");
writeLocalReferences(key);
print(") REFERENCES ");
printIdentifier(getTableName(database.findTable(key.getForeignTableName())));
print(" (");
writeForeignReferences(key);
print(")");
}
}
}
/**
* Writes a single foreign key constraint using a alter table statement.
*
* @param database The database model
* @param table The table
* @param key The foreign key
*/
protected void writeExternalForeignKeyCreateStmt(Database database, Table table, ForeignKey key) throws IOException
{
if (key.getForeignTableName() == null)
{
_log.warn("Foreign key table is null for key " + key);
}
else
{
writeTableAlterStmt(table);
print("ADD CONSTRAINT ");
printIdentifier(getForeignKeyName(table, key));
print(" FOREIGN KEY (");
writeLocalReferences(key);
print(") REFERENCES ");
printIdentifier(getTableName(key.getForeignTableName()));
print(" (");
writeForeignReferences(key);
print(")");
printEndOfStatement();
}
}
/**
* Writes a list of local references for the given foreign key.
*
* @param key The foreign key
*/
protected void writeLocalReferences(ForeignKey key) throws IOException
{
for (int idx = 0; idx < key.getReferenceCount(); idx++)
{
if (idx > 0)
{
print(", ");
}
printIdentifier(key.getReference(idx).getLocalColumnName());
}
}
/**
* Writes a list of foreign references for the given foreign key.
*
* @param key The foreign key
*/
protected void writeForeignReferences(ForeignKey key) throws IOException
{
for (int idx = 0; idx < key.getReferenceCount(); idx++)
{
if (idx > 0)
{
print(", ");
}
printIdentifier(key.getReference(idx).getForeignColumnName());
}
}
/**
* Generates the statement to drop a foreignkey constraint from the database using an
* alter table statement.
*
* @param table The table
* @param foreignKey The foreign key
*/
protected void writeExternalForeignKeyDropStmt(Table table, ForeignKey foreignKey) throws IOException
{
writeTableAlterStmt(table);
print("DROP CONSTRAINT ");
printIdentifier(getForeignKeyName(table, foreignKey));
printEndOfStatement();
}
//
// Helper methods
//
/**
* Prints an SQL comment to the current stream.
*
* @param text The comment text
*/
protected void printComment(String text) throws IOException
{
if (getPlatform().isSqlCommentsOn())
{
print(getPlatformInfo().getCommentPrefix());
// Some databases insist on a space after the prefix
print(" ");
print(text);
print(" ");
print(getPlatformInfo().getCommentSuffix());
println();
}
}
/**
* Prints the start of an embedded statement.
*/
protected void printStartOfEmbeddedStatement() throws IOException
{
println(",");
printIndent();
}
/**
* Prints the end of statement text, which is typically a semi colon followed by
* a carriage return.
*/
protected void printEndOfStatement() throws IOException
{
// TODO: It might make sense to use a special writer which stores the individual
// statements separately (the end of a statement is identified by this method)
println(getPlatformInfo().getSqlCommandDelimiter());
println();
}
/**
* Prints a newline.
*/
protected void println() throws IOException
{
print(LINE_SEPARATOR);
}
/**
* Prints some text.
*
* @param text The text to print
*/
protected void print(String text) throws IOException
{
_writer.write(text);
}
/**
* Returns the delimited version of the identifier (if configured).
*
* @param identifier The identifier
* @return The delimited version of the identifier unless the platform is configured
* to use undelimited identifiers; in that case, the identifier is returned unchanged
*/
protected String getDelimitedIdentifier(String identifier)
{
if (getPlatform().isDelimitedIdentifierModeOn())
{
return getPlatformInfo().getDelimiterToken() + identifier + getPlatformInfo().getDelimiterToken();
}
else
{
return identifier;
}
}
/**
* Prints the given identifier. For most databases, this will
* be a delimited identifier.
*
* @param identifier The identifier
*/
protected void printIdentifier(String identifier) throws IOException
{
print(getDelimitedIdentifier(identifier));
}
/**
* Prints the given identifier followed by a newline. For most databases, this will
* be a delimited identifier.
*
* @param identifier The identifier
*/
protected void printlnIdentifier(String identifier) throws IOException
{
println(getDelimitedIdentifier(identifier));
}
/**
* Prints some text followed by a newline.
*
* @param text The text to print
*/
protected void println(String text) throws IOException
{
print(text);
println();
}
/**
* Prints the characters used to indent SQL.
*/
protected void printIndent() throws IOException
{
print(getIndent());
}
/**
* Creates a reasonably unique identifier only consisting of hexadecimal characters and underscores.
* It looks like d578271282b42fce__2955b56e_107df3fbc96__8000 and is 48 characters long.
*
* @return The identifier
*/
protected String createUniqueIdentifier()
{
return new UID().toString().replace(':', '_').replace('-', '_');
}
}
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