/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* 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 com.alibaba.druid.sql.performance;
import java.text.NumberFormat;
import java.util.List;
import junit.framework.TestCase;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
import com.alibaba.druid.sql.parser.SQLStatementParser;
public class TestSelectPerformance extends TestCase {
private final int COUNT = 1000 * 1000;
private String sql = "SELECT distinct a.id \"id\", a.col \"col\", a.position \"position\", a.panel_id \"panelId\" FROM (select * from view_position_info) a LEFT JOIN db1.view_portal b ON a.panel_id = b.panel_id LEFT JOIN (select * from view_portal_panel) c ON a.panel_id = c.panel_id WHERE b.user_id = ? and ((b.is_grid='y' and c.param_name='is_hidden' and c.param_value='false') or b.is_grid != 'y') and b.user_id in (select user_id from table1 where id = 1) ORDER BY a.col ASC, a.position ASC";
public void test_simple() throws Exception {
for (int i = 0; i < 5; ++i) {
f();
}
}
private void f() throws Exception {
long start = System.currentTimeMillis();
for (int i = 0; i < COUNT; ++i) {
List<SQLStatement> statementList = new SQLStatementParser(sql).parseStatementList();
MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
statementList.get(0).accept(visitor);
// stmtList.toString();
}
long time = System.currentTimeMillis() - start;
System.out.println(NumberFormat.getInstance().format(time));
}
}