// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License. Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
//
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.upgrade.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import org.apache.log4j.Logger;
import com.cloud.utils.exception.CloudRuntimeException;
public class DbUpgradeUtils {
final static Logger s_logger = Logger.getLogger(DbUpgradeUtils.class);
public static void dropKeysIfExist(Connection conn, String tableName, List<String> keys, boolean isForeignKey) {
for (String key : keys) {
PreparedStatement pstmt = null;
try {
if (isForeignKey) {
pstmt = conn.prepareStatement("ALTER TABLE " + tableName + " DROP FOREIGN KEY " + key);
} else {
pstmt = conn.prepareStatement("ALTER TABLE " + tableName + " DROP KEY " + key);
}
pstmt.executeUpdate();
s_logger.debug("Key " + key + " is dropped successfully from the table " + tableName);
} catch (SQLException e) {
// do nothing here
continue;
} finally {
try {
if (pstmt != null) {
pstmt.close();
}
} catch (SQLException e) {
}
}
}
}
public static void dropPrimaryKeyIfExists(Connection conn, String tableName) {
PreparedStatement pstmt = null;
try {
pstmt = conn.prepareStatement("ALTER TABLE " + tableName + " DROP PRIMARY KEY ");
pstmt.executeUpdate();
s_logger.debug("Primary key is dropped successfully from the table " + tableName);
} catch (SQLException e) {
// do nothing here
} finally {
try {
if (pstmt != null) {
pstmt.close();
}
} catch (SQLException e) {
}
}
}
public static void dropTableColumnsIfExist(Connection conn, String tableName, List<String> columns) {
PreparedStatement pstmt = null;
try {
for (String column : columns) {
try {
pstmt = conn.prepareStatement("SELECT " + column + " FROM " + tableName);
pstmt.executeQuery();
} catch (SQLException e) {
// if there is an exception, it means that field doesn't exist, so do nothing here
s_logger.trace("Field " + column + " doesn't exist in " + tableName);
continue;
}
pstmt = conn.prepareStatement("ALTER TABLE " + tableName + " DROP COLUMN " + column);
pstmt.executeUpdate();
s_logger.debug("Column " + column + " is dropped successfully from the table " + tableName);
}
} catch (SQLException e) {
s_logger.warn("Unable to drop columns using query " + pstmt + " due to exception", e);
throw new CloudRuntimeException("Unable to drop columns due to ", e);
} finally {
try {
if (pstmt != null) {
pstmt.close();
}
} catch (SQLException e) {
}
}
}
}