此代码在 MYSQLWorkbench 中正常工作。
use MYDB
drop trigger if exists mytrigger
delimiter //
CREATE TRIGGER mytrigger BEFORE INSERT ON MYTABLE FOR EACH ROW
BEGIN
IF (select COUNT(*) from MYTABLE) = 12 THEN
SET NEW.COL2 = 10;
END IF;
END;//
delimiter ;
MYTABLE 有两列 (COL1,COL2)
我想通过 python 创建这个触发器,所以我在 python 中编写了这段代码:
import mysql.connector
cnx = mysql.connector.connect(user='root', password='root', host='127.0.0.1', database='mysql')
cursor = cnx.cursor()
DB_NAME = 'MYDB'
Table_Name= 'MYTABLE'
cursor.execute("CREATE DATABASE IF NOT EXISTS " + str(DB_NAME))
cnx.commit()
cursor.execute("USE " + str(DB_NAME))
cnx.commit()
cursor.execute("CREATE TABLE IF NOT EXISTS " + str(Table_Name) + " ("
" `COL1` BIGINT(20) NOT NULL ,"
" `COL2` varchar(20) NOT NULL,"
" PRIMARY KEY (`COL1`)"
") ENGINE=InnoDB")
cnx.commit()
cursor.execute(" drop trigger if exists mytrigger")
qrystr = (" delimiter // \n"
" CREATE TRIGGER mytrigger BEFORE INSERT ON MYTABLE FOR EACH ROW \n"
" BEGIN \n"
" IF (select COUNT(*) from MYTABLE) = 12 THEN \n"
" SET NEW.COL2 = 10;\n"
" END IF;\n"
" END;//\n"
" delimiter ; \n")
cursor.execute(qrystr)
cnx.commit()
cnx.close()
但是会发生此错误:(((((((((((((((((((((((((((((((((((((((((())))
错误:您的 SQL 语法有错误;检查与您的 MySQL 服务器版本相对应的手册,以在第 1 行的 'delimiter // CREATE TRIGGER mytrigger BEFORE INSERT ON MYTABLE FOR EACH ROW' 附近使用正确的语法
请帮忙