-connection.query(query, (error, results) => {+connection.query(query, [oldValue, newValue], (error, results) => { 1. 2. // 错误日志示例Error executing query:ER_PARSE_ERROR:You have an errorinyourSQLsyntax;check the
使用场景1 – (Query语句): 需求:把"hero_title"字段中所有的"之"换成" - "来展示,SQL如下: SELECTREPLACE(hero_title,'之',' - ')as repl_title,hero_name,price from LOL; 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mysql>SELECTREPLACE(hero_title,'之',' - ')asrepl_title,hero_name...
在MySQL方向提供了Insert ignore into,insert into on duplicate,replace into这几种写入的方式,看起来好像都差不多,但是实际上在一些场景下的差异还比较大,如果使用不当,恰恰是性能的瓶颈。 整体上我分为两个大的部分,会分别测试这三种数据写入场景。 第一部分基于id,name的数据列,其中id为主键,自增 第二部分基...
| ok | +---+---+ 3 rows in set (0.01 sec) mysql> select last_insert_id(); +---+ | last_insert_id() | +---+ | 3 | +---+ 1 row in set (0.00 sec) replace into t2 values(2, 'bad'); Query OK, 2 rows affected (0.01 sec) 2 rows affected : there is a delete ...
mysql >>select * from test1; +---+---+ | id | age | +---+---+ | 2 | 2 | | 3 | 3 | +---+---+ 2 rows in set (0.00 sec) mysql >>replace into test1 values (6,3); Query OK, 2 rows affected (0.00 sec) mysql >>select * from test1; +---+---+ | id | ag...
insert ignore into test_data values(4,'cc');Query OK, 1 row affected (0.01 sec) select * from test_data;+---+---+| id | name |+---+---+| 1 | aa || 2 | bb || 3 | cc || 4 | cc |+---+---+4 rows in set (0.00 sec) replace into场景 >>replace into test_data...
Query OK,1rowaffected (0.04sec) mysql>REPLACEINTOtestVALUES(1,'New','2014-08-20 18:47:42'); Query OK,2rowsaffected (0.04sec) mysql>SELECT*FROMtest;+---+---+---+|id|data|ts|+---+---+---+|1|New|2014-08-2018:47:42|+---+---+---+1rowinset(0.00sec) 创建第二张表与...
mysql> replace into语句的unique key字段值1001与表中已有的值重复,可以看到replace into执行后打印 Query OK,2 rows affected(0.00 sec),扫描了2行数据,另外id =1 的行被删除,执行完成后检查下主库和从库的AUTO_INCREMENT 主库: |tb_test_auto_increment|CREATETABLE`tb_test_auto_increment` ( ...
(2) TRANSACTION:TRANSACTION 1865, ACTIVE 19 sec insertingmysql tables in use 1, locked 15 lock struct(s), heap size 1136, 5 row lock(s), undo log entries 3MySQL thread id 1156, OS thread handle 139645480060672, query id 102 localhost msandbox updatereplace into ix(a,b) values(9,12)...
in set (0.00 sec) root@test 04:20:43>replace into u (id,d) values(7,232); Query OK, 3 rows affected (0.01 sec)---注意这里affect_rows是3,因为主键7已经存在,唯一索引232已经存在,所以需要删除id为7和8的行,然后插入新行 root@test 04:20:52>select * from u; +---+---+---+ | ...