mysql：insert ignore、insert和replace区别

蔚落 2023-07-15 09:17 5阅读 0赞

insert    报错    插入    insert into names(name, age) values(“小明”, 23);  
insert ignore    忽略    插入    insert ignore into names(name, age) values(“小明”, 24);  
replace    替换    插入    replace into names(name, age) values(“小明”, 25);  
表要求：有PrimaryKey，或者unique索引  
结果：表id都会自增

测试代码  
创建表

CREATE TABLE names(  
    id INT(10) PRIMARY KEY AUTO\_INCREMENT,  
    name VARCHAR(255) UNIQUE,  
    age INT(10)  
)  
   
插入数据

mysql> insert into names(name, age) values("小明", 24);  
mysql> insert into names(name, age) values("大红", 24);  
mysql> insert into names(name, age) values("大壮", 24);  
mysql> insert into names(name, age) values("秀英", 24);

mysql> select \* from names;  
\+----+--------+------+  
| id | name   | age  |  
\+----+--------+------+  
|  1 | 小明   |   24 |  
|  2 | 大红   |   24 |  
|  3 | 大壮   |   24 |  
|  4 | 秀英   |   24 |  
\+----+--------+------+  
   
insert  
插入已存在, id会自增，但是插入不成功，会报错

mysql> insert into names(name, age) values("小明", 23);

ERROR 1062 (23000): Duplicate entry '小明' for key 'name'  
   
replace  
已存在替换，删除原来的记录，添加新的记录

mysql> replace into names(name, age) values("小明", 23);  
Query OK, 2 rows affected (0.00 sec)

mysql> select \* from names;  
\+----+--------+------+  
| id | name   | age  |  
\+----+--------+------+  
|  2 | 大红   |   24 |  
|  3 | 大壮   |   24 |  
|  4 | 秀英   |   24 |  
|  6 | 小明   |   23 |  
\+----+--------+------+  
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
不存在替换，添加新的记录

mysql> replace into names(name, age) values("大名", 23);  
Query OK, 1 row affected (0.00 sec)

mysql> select \* from names;  
\+----+--------+------+  
| id | name   | age  |  
\+----+--------+------+  
|  2 | 大红   |   24 |  
|  3 | 大壮   |   24 |  
|  4 | 秀英   |   24 |  
|  6 | 小明   |   23 |  
|  7 | 大名   |   23 |  
\+----+--------+------+  
   
insert ignore  
插入已存在，忽略新插入的记录，id会自增，不会报错

mysql> insert ignore into names(name, age) values("大壮", 25);  
Query OK, 0 rows affected, 1 warning (0.00 sec)  
1  
2  
插入不存在，添加新的记录

mysql> insert ignore into names(name, age) values("壮壮", 25);  
Query OK, 1 row affected (0.01 sec)

mysql> select \* from  names;  
\+----+--------+------+  
| id | name   | age  |  
\+----+--------+------+  
|  2 | 大红   |   24 |  
|  3 | 大壮   |   24 |  
|  4 | 秀英   |   24 |  
|  6 | 小明   |   23 |  
|  7 | 大名   |   23 |  
| 10 | 壮壮   |   25 |  
\+----+--------+------+

\-------------------------

更多参考：

[https://www.mysqltutorial.org/mysql-insert-ignore/][https_www.mysqltutorial.org_mysql-insert-ignore]

[https_www.mysqltutorial.org_mysql-insert-ignore]: https://www.mysqltutorial.org/mysql-insert-ignore/