/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.core.db;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
/**
* Superclass of all versions of the H2 database.
*
* @author Joseph Marques
*/
public abstract class H2DatabaseType extends DatabaseType {
/**
* The vendor name for all H2 databases.
*/
public static final String VENDOR_NAME = "h2";
/**
* Returns {@link #VENDOR_NAME}.
*
* @see DatabaseType#getVendor()
*/
public String getVendor() {
return VENDOR_NAME;
}
public String getHibernateDialect() {
return "org.rhq.core.domain.server.H2CustomDialect";
}
/**
* @see DatabaseType#isTableNotFoundException(SQLException)
*/
public boolean isTableNotFoundException(SQLException e) {
String msg = e.getMessage();
msg = (msg == null) ? "" : msg.trim().toLowerCase();
return msg.contains("table") && msg.contains("not found");
}
/**
* Assumes the sequence table is the value of the table argument followed by "_", the value of the key argument and
* then "_seq".
*
* @see DatabaseType#getSequenceValue(Connection, String, String)
*/
public int getSequenceValue(Connection conn, String table, String key) throws SQLException {
String query = "SELECT currval('" + table + "_" + key + "_seq')";
PreparedStatement selectPS = null;
ResultSet rs = null;
try {
selectPS = conn.prepareStatement(query);
rs = selectPS.executeQuery();
if (rs.next()) {
return rs.getInt(1);
}
throw new RuntimeException(DbUtilsI18NFactory.getMsg()
.getMsg(DbUtilsI18NResourceKeys.NOT_A_SEQUENCE, query));
} finally {
closeJDBCObjects(null, selectPS, rs);
}
}
/**
* @see DatabaseType#getNextSequenceValue(Connection, String, String)
*/
public int getNextSequenceValue(Connection conn, String table, String key) throws SQLException {
String query = "SELECT nextval('" + table + "_" + key + "_seq')";
PreparedStatement selectPS = null;
ResultSet rs = null;
try {
selectPS = conn.prepareStatement(query);
rs = selectPS.executeQuery();
if (rs.next()) {
return rs.getInt(1);
}
throw new RuntimeException(DbUtilsI18NFactory.getMsg()
.getMsg(DbUtilsI18NResourceKeys.NOT_A_SEQUENCE, query));
} finally {
closeJDBCObjects(null, selectPS, rs);
}
}
/**
* @see DatabaseType#alterColumn(Connection, String, String, String, String, String, Boolean, Boolean)
*/
public void alterColumn(Connection conn, String table, String column, String generic_column_type,
String default_value, String precision, Boolean nullable, Boolean reindex) throws SQLException {
String db_column_type = null;
List<String> sql_list = new ArrayList<String>();
if (generic_column_type != null) {
db_column_type = getDBTypeFromGenericType(generic_column_type);
if (precision != null) {
db_column_type += " (" + precision + ")";
}
sql_list.add("ALTER TABLE " + table + " ALTER COLUMN " + column + " " + db_column_type);
}
if (default_value != null) {
sql_list.add("ALTER TABLE " + table + " ALTER COLUMN " + column + " SET DEFAULT '" + default_value + "'");
}
if (nullable != null) {
if (nullable.booleanValue()) {
sql_list.add("ALTER TABLE " + table + " ALTER " + column + " SET NULL");
} else {
sql_list.add("ALTER TABLE " + table + " ALTER " + column + " SET NOT NULL");
}
}
executeSql(conn, sql_list);
// now that we've altered the column, let's reindex if we were told to do so
if ((reindex != null) && reindex.booleanValue()) {
reindexTable(conn, table);
}
return;
}
/**
* @see DatabaseType#reindexTable(Connection, String)
*/
public void reindexTable(Connection conn, String table) throws SQLException {
PreparedStatement selectPS = null;
ResultSet rs = null;
List<String> sql_list = new ArrayList<String>();
try {
selectPS = conn.prepareStatement("" //
+ "SELECT index_name, column_name " //
+ " FROM user_indexes " //
+ " WHERE table_name = '" + table);
rs = selectPS.executeQuery();
while (rs.next()) {
String indexName = rs.getString(1);
String columnName = rs.getString(2);
sql_list.add("DROP INDEX " + indexName);
sql_list.add("CREATE INDEX " + indexName + " ON " + table + "(" + columnName + ")");
}
executeSql(conn, sql_list);
} finally {
closeResultSet(rs);
closeStatement(selectPS);
}
}
}