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package org.apache.ddlutils.platform.mysql;
/*
* 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.sql.Types;
import java.util.Iterator;
import java.util.Map;
import org.apache.ddlutils.Platform;
import org.apache.ddlutils.alteration.ColumnDefinitionChange;
import org.apache.ddlutils.model.Column;
import org.apache.ddlutils.model.ForeignKey;
import org.apache.ddlutils.model.Table;
import org.apache.ddlutils.model.TypeMap;
import org.apache.ddlutils.platform.SqlBuilder;
/**
* The SQL Builder for MySQL.
*
* @version $Revision: 630717 $
*/
public class MySqlBuilder extends SqlBuilder
{
/**
* Creates a new builder instance.
*
* @param platform The plaftform this builder belongs to
*/
public MySqlBuilder(Platform platform)
{
super(platform);
// we need to handle the backslash first otherwise the other
// already escaped sequences would be affected
addEscapedCharSequence("\\", "\\\\");
addEscapedCharSequence("\0", "\\0");
addEscapedCharSequence("'", "\\'");
addEscapedCharSequence("\"", "\\\"");
addEscapedCharSequence("\b", "\\b");
addEscapedCharSequence("\n", "\\n");
addEscapedCharSequence("\r", "\\r");
addEscapedCharSequence("\t", "\\t");
addEscapedCharSequence("\u001A", "\\Z");
addEscapedCharSequence("%", "\\%");
addEscapedCharSequence("_", "\\_");
}
/**
* {@inheritDoc}
*/
public void dropTable(Table table) throws IOException
{
print("DROP TABLE IF EXISTS ");
printIdentifier(getTableName(table));
printEndOfStatement();
}
/**
* {@inheritDoc}
*/
protected void writeColumnAutoIncrementStmt(Table table, Column column) throws IOException
{
print("AUTO_INCREMENT");
}
/**
* {@inheritDoc}
*/
protected boolean shouldGeneratePrimaryKeys(Column[] primaryKeyColumns)
{
// mySQL requires primary key indication for autoincrement key columns
// I'm not sure why the default skips the pk statement if all are identity
return true;
}
/**
* {@inheritDoc}
* Normally mysql will return the LAST_INSERT_ID as the column name for the inserted id.
* Since ddlutils expects the real column name of the field that is autoincrementing, the
* column has an alias of that column name.
*/
public String getSelectLastIdentityValues(Table table)
{
String autoIncrementKeyName = "";
if (table.getAutoIncrementColumns().length > 0)
{
autoIncrementKeyName = table.getAutoIncrementColumns()[0].getName();
}
return "SELECT LAST_INSERT_ID() " + autoIncrementKeyName;
}
/**
* {@inheritDoc}
*/
protected void writeTableCreationStmtEnding(Table table, Map parameters) throws IOException
{
if (parameters != null)
{
print(" ");
// MySql supports additional table creation options which are appended
// at the end of the CREATE TABLE statement
for (Iterator it = parameters.entrySet().iterator(); it.hasNext();)
{
Map.Entry entry = (Map.Entry)it.next();
print(entry.getKey().toString());
if (entry.getValue() != null)
{
print("=");
print(entry.getValue().toString());
}
if (it.hasNext())
{
print(" ");
}
}
}
super.writeTableCreationStmtEnding(table, parameters);
}
/**
* {@inheritDoc}
*/
public void dropForeignKey(Table table, ForeignKey foreignKey) throws IOException
{
writeTableAlterStmt(table);
print("DROP FOREIGN KEY ");
printIdentifier(getForeignKeyName(table, foreignKey));
printEndOfStatement();
// InnoDB won't drop the auto-index for the foreign key automatically, so we have to do it
if (foreignKey.isAutoIndexPresent())
{
writeTableAlterStmt(table);
print("DROP INDEX ");
printIdentifier(getForeignKeyName(table, foreignKey));
printEndOfStatement();
}
}
/**
* Writes the SQL to add/insert a column.
*
* @param table The table
* @param newColumn The new column
* @param prevColumn The column after which the new column shall be added; null
* if the new column is to be inserted at the beginning
*/
public void insertColumn(Table table, Column newColumn, Column prevColumn) throws IOException
{
print("ALTER TABLE ");
printlnIdentifier(getTableName(table));
printIndent();
print("ADD COLUMN ");
writeColumn(table, newColumn);
if (prevColumn != null)
{
print(" AFTER ");
printIdentifier(getColumnName(prevColumn));
}
else
{
print(" FIRST");
}
printEndOfStatement();
}
/**
* Writes the SQL to drop a column.
*
* @param table The table
* @param column The column to drop
*/
public void dropColumn(Table table, Column column) throws IOException
{
print("ALTER TABLE ");
printlnIdentifier(getTableName(table));
printIndent();
print("DROP COLUMN ");
printIdentifier(getColumnName(column));
printEndOfStatement();
}
/**
* Writes the SQL to drop the primary key of the given table.
*
* @param table The table
*/
public void dropPrimaryKey(Table table) throws IOException
{
print("ALTER TABLE ");
printlnIdentifier(getTableName(table));
printIndent();
print("DROP PRIMARY KEY");
printEndOfStatement();
}
/**
* Writes the SQL to recreate a column, e.g. with a different type.
*
* @param table The table
* @param column The new column definition
*/
public void recreateColumn(Table table, Column column) throws IOException
{
print("ALTER TABLE ");
printlnIdentifier(getTableName(table));
printIndent();
print("MODIFY COLUMN ");
writeColumn(table, column);
printEndOfStatement();
}
/**
* {@inheritDoc}
*/
protected void writeCastExpression(Column sourceColumn, Column targetColumn) throws IOException
{
boolean sizeChanged = ColumnDefinitionChange.isSizeChanged(getPlatformInfo(), sourceColumn, targetColumn);
boolean typeChanged = ColumnDefinitionChange.isTypeChanged(getPlatformInfo(), sourceColumn, targetColumn);
if (sizeChanged || typeChanged)
{
String targetNativeType = getNativeType(targetColumn);
switch (targetColumn.getTypeCode())
{
case Types.BIT:
case Types.BOOLEAN:
case Types.TINYINT:
case Types.SMALLINT:
case Types.INTEGER:
case Types.BIGINT:
targetNativeType = "SIGNED";
break;
case Types.FLOAT:
case Types.REAL:
case Types.DOUBLE:
targetNativeType = "SIGNED"; // ?
break;
case Types.DECIMAL:
case Types.NUMERIC:
targetNativeType = "DECIMAL";
break;
case Types.DATE:
targetNativeType = "DATE";
break;
case Types.TIMESTAMP:
targetNativeType = "DATETIME";
break;
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
targetNativeType = "CHAR";
break;
default:
targetNativeType = "BINARY";
break;
}
print("CAST(");
if (TypeMap.isTextType(sourceColumn.getTypeCode()) && TypeMap.isTextType(targetColumn.getTypeCode()) && sizeChanged)
{
print("LEFT(");
printIdentifier(getColumnName(sourceColumn));
print(",");
print(targetColumn.getSize());
print(")");
}
else
{
printIdentifier(getColumnName(sourceColumn));
}
print(" AS ");
print(getSqlType(targetColumn, targetNativeType));
print(")");
}
else
{
printIdentifier(getColumnName(sourceColumn));
}
}
}
