为什么MySQL insert比JDBC慢？

Question

+-----------+--------------+------+-----+-------------------+----------------+
| Field     | Type         | Null | Key | Default           | Extra          |
+-----------+--------------+------+-----+-------------------+----------------+
| id        | int(11)      | NO   | PRI | NULL              | auto_increment |
| name      | varchar(32)  | NO   |     | NULL              |                |
| pid       | varchar(32)  | NO   |     | NULL              |                |
+-----------+--------------+------+-----+-------------------+----------------+

begin
  set @i=0;
  while @i<200 do
    insert into test.table_test
      (name, pid) values ('1', '1');
    set @i=@i+1;
  end while;
end

mysql> call test();
Query OK, 0 rows affected (17.24 sec)

static String mySqlUrl="jdbc:mysql://127.0.0.1:3306/test?rewriteBatchedStatements=true";

static String sql = "insert into bael_test(name, pid) values(?, ?)"; 

public static void test_mysql_batch(int point){  
    Connection conn=getConn("mysql");  
    clear(conn);
    try {        
        PreparedStatement prest = conn.prepareStatement(sql);        
        long a=System.currentTimeMillis();  
        for(int x = 1; x <= 100000; x++){            
            prest.setString(1, "name");
            prest.setString(2, "pid");
            prest.addBatch();    
            if(x%point==0){
                    prest.executeBatch();      
                    conn.commit();
            }
        }        
        long b=System.currentTimeMillis();  
        print("MySql batch insert 10^5 rows",a,b,point);
    } catch (Exception ex) {  
        ex.printStackTrace();  
    }finally{  
        close(conn);    
    }  
} 

Answer 1

您的Java代码使用准备好的语句，而您的MySQL代码不使用。

换句话说，您的过程必须在循环的每一步检查查询的语法是否正确，并在磁盘上查找表，而准备好的语句只执行此操作，只在正确的位置插入值，而无需进一步处理。

如果要进行比较，可以使用prepare->http://dev.mysql.com/doc/refman/5.0/en/sql-syntax-prepared-statements.html

PREPARE stmt1 FROM 'INSERT INTO test.table_test (name,pid) values(?,?)';
while @i<200 do
    EXECUTE stmt1 USING @i, @i;;
    set @i=@i+1;
  end while;
DEALLOCATE PREPARE stmt1;