以下是MariaDB中create trigger的语法:MySQL不支持or replace和if not exists子句。 CREATE [OR REPLACE] TRIGGER [IF NOT EXISTS] trigger_name { BEFORE | AFTER } { INSERT | UPDATE | DELETE } ON tbl_name FOR EACH ROW trigger_body 触发器只能建立在永久表上,不能建立在视图和临时表上。MySQL/MariaD...
15.1.22 CREATE TRIGGER Statement CREATE [DEFINER = user] TRIGGER [IF NOT EXISTS] trigger_name trigger_time trigger_event ON tbl_name FOR EACH ROW [trigger_order] trigger_body trigger_time: { BEFORE | AFTER } trigger_event: { INSERT | UPDATE | DELETE } trigger_order: { FOLLOWS | ...
4CREATE[OR REPLACE]TRIGGER[IF NOT EXISTS]trigger_name{BEFORE|AFTER} {INSERT|UPDATE|DELETE}ONtbl_nameFOREACHROWtrigger_body 触发器只能建立在永久表上,不能建立在视图和临时表上。MySQL/MariaDB中的触发器只支持行级触发器(即每行都触发一次触发器),不支持数据库级别和服务器级别的触发器。MySQL/MariaDB中...
if(conn!=null){ valstmt:Statement=conn.createStatement valctbsql:String="createtableifnotexists"+tbname+"("+ "idbigint(20)notnullprimarykey,"+ "namevarchar(255)notnull,"+ "pricedouble,"+ "pricechangetodaydouble,"+ "categoryvarchar(20));" valtbtrigger="droptriggerifexists"+tbname+"price...
CREATE TABLE IF NOT EXISTS table_name ( id INT PRIMARY KEY, name VARCHAR(255) ); 4. 触发器冲突 原因:已经存在同名的触发器。 解决方法:删除已存在的同名触发器,或者使用不同的触发器名称。 代码语言:txt 复制 DROP TRIGGER IF EXISTS trigger_name; 5. 存储引擎限制 原因:某些存储引擎(如MyISAM)不支...
Status:DuplicateImpact on me: None Category:MySQL Server: DDLSeverity:S4 (Feature request) Version:5.1OS:Any Assigned to:CPU Architecture:Any [21 Oct 2008 14:34] Olivier Chédru Description:The syntax "CREATE TRIGGER IF NOT EXISTS" would be very useful, especially when working with MySQL workb...
CREATETRIGGERcfq1 AFTERINSERTONstudentFOREACHROWBEGINinsertintostudent_point ( name, point)values( NEW.name, NEW.age);-- NEW用来表示将要(BEFORE)或已经(AFTER)插入的新数据END意思就是在给student表插入数据之后,自动在student_point表钟插入新数据的姓名和年龄。
-> Begin -> If not exists(select 1 from user_data where d_id=new.id) then -> insert into user_data(d_id,d_name) values(new.id,new.name);-> END IF;-> end;// -> delimiter ;或者简单一点:mysql> delimiter // -> create trigger sitedata_ins2 -> before insert on ...
create trigger 触发器名 before|after 触发事件 on 表名 for each row 执行语句; 2、创建有多个执行语句的触发器 create trigger 触发器名 before|after 触发事件 on 表名 for each row begin 执行语句列表 end; 操作 -- 数据准备 create database if not exists mydb10_trigger; use mydb10_trigger; -...
create [if not exists] procedure 名字 ([in | out | inout] 参数名称 参数类型) begin # sql语句 end; 查询存储过程: 存储过程存放于infomation_schema数据库,routines表e -- 使用sql查询 SELECT * from information_schema.ROUTINES where information_schema.routines.routine_schema != 'sys' ...