/*
* 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.JdbcTemplate;
import org.flywaydb.core.internal.dbsupport.Schema;
import org.flywaydb.core.internal.dbsupport.Table;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* MySQL implementation of Schema.
*/
public class MySQLSchema extends Schema<MySQLDbSupport> {
/**
* Creates a new MySQL schema.
*
* @param jdbcTemplate The Jdbc Template for communicating with the DB.
* @param dbSupport The database-specific support.
* @param name The name of the schema.
*/
public MySQLSchema(JdbcTemplate jdbcTemplate, MySQLDbSupport dbSupport, String name) {
super(jdbcTemplate, dbSupport, name);
}
@Override
protected boolean doExists() throws SQLException {
return jdbcTemplate.queryForInt("SELECT COUNT(*) FROM information_schema.schemata WHERE schema_name=?", name) > 0;
}
@Override
protected boolean doEmpty() throws SQLException {
int objectCount = jdbcTemplate.queryForInt("Select "
+ "(Select count(*) from information_schema.TABLES Where TABLE_SCHEMA=?) + "
+ "(Select count(*) from information_schema.VIEWS Where TABLE_SCHEMA=?) + "
+ "(Select count(*) from information_schema.TABLE_CONSTRAINTS Where TABLE_SCHEMA=?) + "
+ "(Select count(*) from information_schema.EVENTS Where EVENT_SCHEMA=?) + "
+ "(Select count(*) from information_schema.TRIGGERS Where TRIGGER_SCHEMA=?) + "
+ "(Select count(*) from information_schema.ROUTINES Where ROUTINE_SCHEMA=?)",
name, name, name, name, name, name
);
return objectCount == 0;
}
@Override
protected void doCreate() throws SQLException {
jdbcTemplate.execute("CREATE SCHEMA " + dbSupport.quote(name));
}
@Override
protected void doDrop() throws SQLException {
jdbcTemplate.execute("DROP SCHEMA " + dbSupport.quote(name));
}
@Override
protected void doClean() throws SQLException {
for (String statement : cleanEvents()) {
jdbcTemplate.execute(statement);
}
for (String statement : cleanRoutines()) {
jdbcTemplate.execute(statement);
}
for (String statement : cleanViews()) {
jdbcTemplate.execute(statement);
}
jdbcTemplate.execute("SET FOREIGN_KEY_CHECKS = 0");
for (Table table : allTables()) {
table.drop();
}
jdbcTemplate.execute("SET FOREIGN_KEY_CHECKS = 1");
}
/**
* Generate the statements to clean the events in this schema.
*
* @return The list of statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List<String> cleanEvents() throws SQLException {
List<Map<String, String>> eventNames =
jdbcTemplate.queryForList(
"SELECT event_name FROM information_schema.events WHERE event_schema=?",
name);
List<String> statements = new ArrayList<String>();
for (Map<String, String> row : eventNames) {
statements.add("DROP EVENT " + dbSupport.quote(name, row.get("event_name")));
}
return statements;
}
/**
* Generate the statements to clean the routines in this schema.
*
* @return The list of statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List<String> cleanRoutines() throws SQLException {
List<Map<String, String>> routineNames =
jdbcTemplate.queryForList(
"SELECT routine_name, routine_type FROM information_schema.routines WHERE routine_schema=?",
name);
List<String> statements = new ArrayList<String>();
for (Map<String, String> row : routineNames) {
String routineName = row.get("routine_name");
String routineType = row.get("routine_type");
statements.add("DROP " + routineType + " " + dbSupport.quote(name, routineName));
}
return statements;
}
/**
* Generate the statements to clean the views in this schema.
*
* @return The list of statements.
* @throws SQLException when the clean statements could not be generated.
*/
private List<String> cleanViews() throws SQLException {
List<String> viewNames =
jdbcTemplate.queryForStringList(
"SELECT table_name FROM information_schema.views WHERE table_schema=?", name);
List<String> statements = new ArrayList<String>();
for (String viewName : viewNames) {
statements.add("DROP VIEW " + dbSupport.quote(name, viewName));
}
return statements;
}
@Override
protected Table[] doAllTables() throws SQLException {
List<String> tableNames = jdbcTemplate.queryForStringList(
"SELECT table_name FROM information_schema.tables WHERE table_schema=? AND table_type='BASE TABLE'", name);
Table[] tables = new Table[tableNames.size()];
for (int i = 0; i < tableNames.size(); i++) {
tables[i] = new MySQLTable(jdbcTemplate, dbSupport, this, tableNames.get(i));
}
return tables;
}
@Override
public Table getTable(String tableName) {
return new MySQLTable(jdbcTemplate, dbSupport, this, tableName);
}
}