content: /*
   * Copyright 1999-2018 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 com.alibaba.druid.sql.ast.SQLStatement;
  import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
  import com.alibaba.druid.sql.parser.SQLStatementParser;
  import junit.framework.TestCase;
  
  import java.text.NumberFormat;
  import java.util.List;
  
  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));
      }
  }
  