SQL批量删除与批量插入

Posted 2020-08-21 山高我为峰

批量删除：

DELETE FROM MyTable WHERE ID IN (1,2);

批量插入：

INSERT INTO MyTable(ID,NAME) VALUES(1,‘123‘);
INSERT INTO MyTable(ID,NAME) VALUES(2,‘456‘);
INSERT INTO MyTable(ID,NAME) VALUES(3,‘789‘);

第二种方法，使用UNION ALL来进行插入操作：    
INSERT INTO MyTable(ID,NAME)
SELECT 4,‘000‘
UNION ALL
SELECT 5,‘001‘
UNION ALL
SELECT 6,‘002‘ ;
据说要比第一种要快！

第三种方法  
INSERT INTO MyTable(ID,NAME) VALUES(7,‘003‘),(8,‘004‘),(9,‘005‘);

Example：

表： leafjob(
leafnum INT NOT NULL PRIMARY KEY,
machine VARCHAR(15) );

删除：delete from leafjob where leafnum in (1,2,4);

插入：

INSERT INTO leafjob (leafnum, machine) values(1, ‘r1leaf3‘), (2, ‘r1leaf22‘);

insert into leafjob(leafnum, machine) select 4,‘000‘ union all select 1,‘r1leaf3‘ union all select 2,‘r1leaf22‘;

insert into leafjob(leafnum, machine) select 1,‘r1leaf3‘ union select 2,‘r1leaf22‘;

注：性能问题需要具体测试。示例在mysql下测试过，version: 4.1.20