/*******************************************************************************
*
* Copyright 2010 Alexandru Craciun, and individual contributors as indicated
* by the @authors tag.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
******************************************************************************/
package org.netxilia.spi.impl.storage.db.ddl.dialect;
import java.util.List;
import org.apache.commons.lang.ObjectUtils;
import org.netxilia.spi.impl.storage.db.ddl.schema.DbColumn;
import org.netxilia.spi.impl.storage.db.ddl.schema.DbTable;
/**
* Generate PostgreSQL specific SQL
*
* @author catac
*/
public class PostgreSQLDialect extends AbstractSqlDialect {
@Override
public String getDbDialect() {
return "PostgreSQL";
}
@Override
protected void appendModifyColumnCommands(List<String> commands, DbTable table, DbColumn oldCol, DbColumn newCol) {
if (!oldCol.getNameUnique().equals(newCol.getNameUnique())) {
commands.add("ALTER TABLE " + table.getName() + " RENAME COLUMN " //
+ oldCol.getName() + " TO " + newCol.getName());
}
String alter = "ALTER TABLE " + table.getName() + " ALTER COLUMN " + newCol.getName() + " ";
if ((oldCol.getDataType() != newCol.getDataType()) //
|| !ObjectUtils.equals(oldCol.getSize(), newCol.getSize())//
|| !ObjectUtils.equals(oldCol.getScale(), newCol.getScale())) {
StringBuilder sb = new StringBuilder(alter);
sb.append(" TYPE ");
appendSqlColumnType(newCol, sb);
commands.add(sb.toString());
}
if (!ObjectUtils.equals(oldCol.getDefaultValue(), newCol.getDefaultValue())) {
String defaultValue = newCol.getDefaultValue();
if (defaultValue != null) {
commands.add(alter + "SET DEFAULT " + getSqlValue(newCol, defaultValue));
} else {
commands.add(alter + "DROP DEFAULT");
}
}
if (oldCol.isNullable() != newCol.isNullable()) {
commands.add(alter + (newCol.isNullable() ? "DROP " : "SET ") + "NOT NULL");
}
}
@Override
public String sqlDropPrimaryKey(String tableName) {
return "ALTER TABLE " + tableName + " DROP CONSTRAINT pk_" + tableName;
}
}