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JDBC Driver for the Firebird RDBMS
/*
* $Id: AbstractGeneratedKeysQuery.java 56937 2012-04-04 18:31:34Z mrotteveel $
*
* Firebird Open Source J2EE Connector - JDBC Driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a CVS history command.
*
* All rights reserved.
*/
package org.firebirdsql.jdbc;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.firebirdsql.jdbc.parser.JaybirdStatementModel;
import org.firebirdsql.jdbc.parser.StatementParser;
import org.firebirdsql.jdbc.parser.StatementParser.ParseException;
import org.firebirdsql.logging.Logger;
import org.firebirdsql.logging.LoggerFactory;
/**
* Class to add the RETURNING clause to queries for returning generated keys.
*
* @author Mark Rotteveel
* @since 2.2
*/
public abstract class AbstractGeneratedKeysQuery {
private static final int QUERY_TYPE_KEEP_UNMODIFIED = 1;
private static final int QUERY_TYPE_ADD_ALL_COLUMNS = 2;
private static final int QUERY_TYPE_ADD_INDEXED = 3;
private static final int QUERY_TYPE_ADD_COLUMNS = 4;
private static final int QUERY_TYPE_ALREADY_HAS_RETURNING = 5;
private static final StatementParser parser;
static {
// Attempt to load statement parser
StatementParser temp = null;
try {
temp = (StatementParser)Class.forName("org.firebirdsql.jdbc.parser.StatementParserImpl").newInstance();
} catch (Throwable ex) {
// Unable to load class of parser implementation, antlr-runtime not in path
Logger log = LoggerFactory.getLogger(AbstractGeneratedKeysQuery.class, true);
if (log != null) {
log.error("Unable to load generated key parser", ex);
}
} finally {
parser = temp;
}
}
private final String originalSQL;
private String modifiedSQL;
private int queryType = QUERY_TYPE_KEEP_UNMODIFIED;
private int[] columnIndexes;
private String[] columnNames;
private boolean processed = false;
private boolean generatesKeys = false;
private JaybirdStatementModel statementModel;
private AbstractGeneratedKeysQuery(String sql) {
originalSQL = sql;
}
/**
* Process SQL statement text according to autoGeneratedKeys value.
*
* For Statement.NO_GENERATED_KEYS the statement will not be processed, for
* Statement.RETURN_GENERATED_KEYS it will be processed.
*
*
* The query will only be modified if 1) it is capable of returning keys (ie
* INSERT, DELETE and UPDATE) and 2) does not already contain a RETURNING
* clause.
*
*
* @param sql
* SQL statement
* @param autoGeneratedKeys
* Valid values {@link java.sql.Statement#NO_GENERATED_KEYS} and
* {@link java.sql.Statement#RETURN_GENERATED_KEYS}
* @throws SQLException
* If the supplied autoGeneratedKeys value does not match valid
* values or if the parser cannot be loaded when autoGeneratedKeys = RETURN_GENERATED_KEYS.
*/
public AbstractGeneratedKeysQuery(String sql, int autoGeneratedKeys) throws SQLException {
this(sql);
switch (autoGeneratedKeys) {
case Statement.RETURN_GENERATED_KEYS:
if (parser == null) {
throw new FBDriverNotCapableException("Generated keys functionality not available, most likely cause: ANTLR-Runtime not available on classpath");
}
queryType = QUERY_TYPE_ADD_ALL_COLUMNS;
break;
case Statement.NO_GENERATED_KEYS:
queryType = QUERY_TYPE_KEEP_UNMODIFIED;
break;
default:
throw new FBSQLException("Supplied value for autoGeneratedKeys is invalid", FBSQLException.SQL_STATE_INVALID_OPTION_IDENTIFIER);
}
}
/**
* Process SQL statement for adding generated key columns by their ordinal
* position.
*
* The query will only be modified if 1) it is capable of returning keys (ie
* INSERT, DELETE and UPDATE) and 2) does not already contain a RETURNING
* clause.
*
*
* The columns are added in ascending order of their index value, not by the
* order of indexes in the columnIndexes array. The values of columnIndexes
* are taken as the ORDINAL_POSITION returned by
* {@link java.sql.DatabaseMetaData#getColumns(String, String, String, String)}
* . When a column index does not exist for the table of the query, then it
* will be discarded from the list silently.
*
*
* @param sql
* SQL statement
* @param columnIndexes
* Array of ORDINAL_POSITION values of the columns to return as
* generated key
* @throws SQLException If the parser cannot be loaded
*/
public AbstractGeneratedKeysQuery(String sql, int[] columnIndexes) throws SQLException {
this(sql);
if (parser == null) {
throw new FBDriverNotCapableException("Generated keys functionality not available, most likely cause: ANTLR-Runtime not available on classpath");
} else if (columnIndexes != null && columnIndexes.length != 0) {
this.columnIndexes = columnIndexes.clone();
queryType = QUERY_TYPE_ADD_INDEXED;
} else {
queryType = QUERY_TYPE_KEEP_UNMODIFIED;
}
}
/**
* Process SQL statement for adding generated key columns by name.
*
* The query will only be modified if 1) it is capable of returning keys (ie
* INSERT, DELETE and UPDATE) and 2) does not already contain a RETURNING
* clause.
*
*
* The columnNames passed are taken as is and included in a new returning
* clause. There is no check for actual existence of these columns, nor are
* they quoted.
*
*
* @param sql
* SQL statement
* @param columnNames
* Array of column names to return as generated key
* @throws SQLException If the parser cannot be loaded
*/
public AbstractGeneratedKeysQuery(String sql, String[] columnNames) throws SQLException {
this(sql);
if (parser == null) {
throw new FBDriverNotCapableException("Generated keys functionality not available, most likely cause: ANTLR-Runtime not available on classpath");
} else if (columnNames != null && columnNames.length != 0) {
this.columnNames = columnNames.clone();
queryType = QUERY_TYPE_ADD_COLUMNS;
} else {
queryType = QUERY_TYPE_KEEP_UNMODIFIED;
}
}
/**
* Indicates if the query will generate keys.
*
* @return true if the query will generate keys,
* false otherwise
* @throws SQLException
* For errors accessing the metadata
*/
public boolean generatesKeys() throws SQLException {
process();
return generatesKeys;
}
/**
* Returns the actual query.
*
* Use {@link #generatesKeys()} to see if this query will in fact generate
* keys.
*
*
* @return The SQL query
* @throws SQLException
* For errors accessing the metadata
*/
public String getQueryString() throws SQLException {
process();
return modifiedSQL;
}
/**
* Parses the query and updates the query with generated keys if
* modifications are needed or possible.
*
* @throws SQLException
* For errors accessing the metadata
*/
private void process() throws SQLException {
if (processed) {
return;
}
try {
processStatementModel();
updateQuery();
} finally {
processed = true;
}
}
/**
* Parses the original SQL query and checks if it already has a RETURNING
* clause
* @throws SQLException If query parsing is not available
*/
private void processStatementModel() throws SQLException {
if (parser == null) {
if (queryType == QUERY_TYPE_KEEP_UNMODIFIED) {
// JDBC specifies that NO_GENERATED_KEYS (signified here by QUERY_TYPE_KEEP_UNMODIFIED)
// should not result in failure if processing generated keys is not possible
return;
} else {
// This condition should already have been caught in constructors, but do it anyway:
throw new FBDriverNotCapableException("Generated keys functionality not available, most likely cause: ANTLR-Runtime not available on classpath");
}
}
try {
statementModel = parseInsertStatement(originalSQL);
if (statementModel.getReturningColumns().size() > 0) {
queryType = QUERY_TYPE_ALREADY_HAS_RETURNING;
}
} catch (ParseException e) {
// Unrecognized statement (so no INSERT, DELETE, UPDATE or UPDATE OR
// INSERT statement), keep as is
queryType = QUERY_TYPE_KEEP_UNMODIFIED;
}
}
/**
* Adds the generated key columns to the query.
*
* @throws SQLException
* For errors accessing the metadata
*/
private void updateQuery() throws SQLException {
switch (queryType) {
case QUERY_TYPE_ADD_ALL_COLUMNS:
addAllColumns();
break;
case QUERY_TYPE_ADD_INDEXED:
addIndexedColumns();
break;
case QUERY_TYPE_ADD_COLUMNS:
addReturningClause();
break;
case QUERY_TYPE_ALREADY_HAS_RETURNING:
generatesKeys = true;
queryType = QUERY_TYPE_KEEP_UNMODIFIED;
break;
case QUERY_TYPE_KEEP_UNMODIFIED:
// Do nothing
break;
default:
throw new IllegalStateException("Unsupported value for queryType: " + queryType);
}
// Not part of switch: elements of switch will modify queryType (eg when
// nothing is added)
if (queryType == QUERY_TYPE_KEEP_UNMODIFIED) {
modifiedSQL = originalSQL;
}
}
/**
* Adds all available table columns to the query as generated keys.
*
* @throws SQLException
* For errors accessing the metadata
*/
private void addAllColumns() throws SQLException {
DatabaseMetaData metaData = getDatabaseMetaData();
ResultSet rs = metaData.getColumns(null, null, statementModel.getTableName(), null);
List columns = new ArrayList();
try {
while (rs.next()) {
// Need to quote columns for mixed case columns
columns.add('"' + rs.getString(4) + '"');
}
} finally {
rs.close();
}
columnNames = (String[]) columns.toArray(new String[0]);
addReturningClause();
}
/**
* Adds all columns referenced by columnIndexes to the query as generated
* keys.
*
* @throws SQLException
* For errors accessing the metadata
*/
private void addIndexedColumns() throws SQLException {
DatabaseMetaData metaData = getDatabaseMetaData();
ResultSet rs = metaData.getColumns(null, null, statementModel.getTableName(), null);
Arrays.sort(columnIndexes);
List columns = new ArrayList();
try {
while (rs.next()) {
if (Arrays.binarySearch(columnIndexes, rs.getInt(17)) >= 0) {
// Need to quote columns for mixed case columns
columns.add('"' + rs.getString(4) + '"');
}
}
} finally {
rs.close();
}
columnNames = (String[]) columns.toArray(new String[0]);
addReturningClause();
}
/**
* Adds the columns in columnNames to the query as generated keys.
*/
private void addReturningClause() {
if (columnNames == null || columnNames.length == 0) {
queryType = QUERY_TYPE_KEEP_UNMODIFIED;
return;
}
generatesKeys = true;
StringBuffer query = new StringBuffer(originalSQL);
if (query.charAt(query.length() - 1) == ';') {
query.deleteCharAt(query.length() - 1);
}
query.append('\n');
query.append("RETURNING ");
for (int i = 0; i < columnNames.length; i++) {
query.append(columnNames[i]);
if (i < columnNames.length - 1) {
query.append(", ");
}
}
modifiedSQL = query.toString();
}
/**
* Returns the DatabaseMetaData object to be used when processing this
* query. In general this should be a DatabaseMetaData object created from
* the connection which will execute the query.
*
* @return DatabaseMetaData object
* @throws SQLException
* if a database access error occurs
*/
abstract DatabaseMetaData getDatabaseMetaData() throws SQLException;
/**
* Parse the INSERT statement and extract the corresponding model.
*
* @param sql
* SQL statement to parse.
*
* @return instance of {@link JaybirdStatementModel}
* @throws ParseException if statement cannot be parsed.
*/
private JaybirdStatementModel parseInsertStatement(String sql) throws ParseException {
return parser.parseInsertStatement(sql);
}
}