/*
* Copyright 2010-2017 Boxfuse GmbH
*
* 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.
*/
package org.flywaydb.core.internal.dbsupport.mysql;
import org.flywaydb.core.internal.dbsupport.DbSupport;
import org.flywaydb.core.internal.dbsupport.FlywaySqlException;
import org.flywaydb.core.internal.dbsupport.JdbcTemplate;
import org.flywaydb.core.internal.dbsupport.Schema;
import org.flywaydb.core.internal.dbsupport.SqlStatementBuilder;
import org.flywaydb.core.internal.dbsupport.Table;
import org.flywaydb.core.internal.util.StringUtils;
import org.flywaydb.core.internal.util.logging.Log;
import org.flywaydb.core.internal.util.logging.LogFactory;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Types;
import java.util.UUID;
import java.util.concurrent.Callable;
/**
* Mysql-specific support.
*/
public class MySQLDbSupport extends DbSupport {
private static final Log LOG = LogFactory.getLog(MySQLDbSupport.class);
/**
* Creates a new instance.
*
* @param connection The connection to use.
*/
public MySQLDbSupport(Connection connection) {
super(new JdbcTemplate(connection, Types.VARCHAR));
}
public String getDbName() {
return "mysql";
}
public String getCurrentUserFunction() {
return "SUBSTRING_INDEX(USER(),'@',1)";
}
@Override
protected String doGetCurrentSchemaName() throws SQLException {
return jdbcTemplate.getConnection().getCatalog();
}
/**
* Sets the current schema to this schema.
*
* @param schema The new current schema for this connection.
*/
public void changeCurrentSchemaTo(Schema schema) {
if (schema.getName().equals(originalSchema) || !schema.exists()) {
return;
}
try {
doChangeCurrentSchemaTo(schema.getName());
} catch (SQLException e) {
throw new FlywaySqlException("Error setting current schema to " + schema, e);
}
}
@Override
protected void doChangeCurrentSchemaTo(String schema) throws SQLException {
if (!StringUtils.hasLength(schema)) {
try {
// Weird hack to switch back to no database selected...
String newDb = quote(UUID.randomUUID().toString());
jdbcTemplate.execute("CREATE SCHEMA " + newDb);
jdbcTemplate.execute("USE " + newDb);
jdbcTemplate.execute("DROP SCHEMA " + newDb);
} catch (Exception e) {
LOG.warn("Unable to restore connection to having no default schema: " + e.getMessage());
}
} else {
jdbcTemplate.getConnection().setCatalog(schema);
}
}
public boolean supportsDdlTransactions() {
return false;
}
public String getBooleanTrue() {
return "1";
}
public String getBooleanFalse() {
return "0";
}
public SqlStatementBuilder createSqlStatementBuilder() {
return new MySQLSqlStatementBuilder();
}
@Override
public String doQuote(String identifier) {
return "`" + identifier + "`";
}
@Override
public Schema getSchema(String name) {
return new MySQLSchema(jdbcTemplate, this, name);
}
@Override
public boolean catalogIsSchema() {
return true;
}
@Override
public <T> T lock(Table table, Callable<T> callable) {
return new MySQLNamedLockTemplate(jdbcTemplate, table.toString().hashCode()).execute(callable);
}
@Override
public boolean useSingleConnection() {
return true;
}
}