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<?php
/**
* Copyright 2015 OpenStack Foundation
* Licensed 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.
**/
final class DBSchema
{
/**
* @param string $db_name
* @param string $table_name
* @return bool
*/
public static function existsTable($db_name, $table_name)
{
$sql = <<<SQL
SELECT COUNT(*) FROM information_schema.TABLES WHERE TABLE_SCHEMA ='{$db_name}' AND TABLE_NAME= '{$table_name}';
SQL;
return intval(DB::query($sql)->value()) > 0;
}
/**
* @param string $db_name
* @param string $table_name
* @param string $col_name
* @return bool
*/
public static function existsColumn($db_name, $table_name, $col_name){
$sql = <<<SQL
SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA ='{$db_name}' AND TABLE_NAME= '{$table_name}' AND COLUMN_NAME = '{$col_name}';
SQL;
return intval(DB::query($sql)->value()) > 0;
}
/**
* @param string $db_name
* @param string $table_name
* @param string $index_name
* @return bool
*/
public static function existsIndex($db_name, $table_name, $index_name){
$sql = <<<SQL
SELECT COUNT(*) FROM information_schema.statistics WHERE TABLE_SCHEMA ='{$db_name}' AND TABLE_NAME = '{$table_name}' AND INDEX_NAME = '{$index_name}';
SQL;
return intval(DB::query($sql)->value()) > 0;
}
public static function dropColumn($db_name, $table_name, $col_name)
{
$sql = <<<SQL
ALTER TABLE $table_name DROP COLUMN $col_name;
SQL;
return intval(DB::query($sql)->value()) > 0;
}
public static function renameColumn($db_name, $table_name, $old_column_name, $new_column_name, $data_type)
{
$sql = <<<SQL
ALTER TABLE "{$table_name}" CHANGE '{$old_column_name}' '{$new_column_name}' {$data_type};
SQL;
return intval(DB::query($sql)->value()) > 0;
}
public static function dropIndex($db_name, $table_name, $index_name)
{
$sql = <<<SQL
ALTER TABLE {$table_name} DROP INDEX {$index_name};
SQL;
return intval(DB::query($sql)->value()) > 0;
}
public static function dropTable($db_name, $table_name)
{
$sql = <<<SQL
DROP TABLE {$table_name};
SQL;
return intval(DB::query($sql)->value()) > 0;
}
public static function truncateTable($db_name, $table_name){
$sql = <<<SQL
TRUNCATE TABLE {$table_name};
SQL;
return intval(DB::query($sql)->value()) > 0;
}
}