Mysql异常 java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax

Mysql异常java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax

今天在工作中分配了两个bug给我，起初以为是MySQL语法有问题，然后经过一顿分析sql，发现sql并没有问题，且sql语句能在Navicat上正常运行。

部分sql：sql语句并不是完整的，此处只是做个多行sql的展示

SET @days = TIMESTAMPDIFF( DAY, DATE_ADD( date_format( '2022-09-28', '%Y-%m-%d' ), INTERVAL - 1 DAY ), date_format( '2022-09-28', '%Y-%m-%d' ) ) + 0;
SET @numberCount = 1;
SELECT
	t.date,
	d.dept_name AS deptName,
	d.dept_id AS deptId,
	count( m.id ) AS memberQuantity 
FROM
	(
	SELECT
		t.datameth AS `date` 
	FROM
		(
		SELECT
			@numberCount := @numberCount - 1 AS numberbvalue,
			ADDDATE( date_format( '2022-09-28', '%Y-%m-%d' ), @numberCount ) AS datameth 

报错信息：

java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET @numberCount = 1;

分析：

最后发现sql能够在navicat上面正常的运行，于是就去看配置。因为sql语句里面使用了变量，而变量的定义相当于多行sql。但是mybatis默认是不开启多行sql执行的，于是我去看配置，果然，没有开启MySQL多行sql执行

开启多行sql执行：在数据库连接信息配置中 url后面加上：allowMultiQueries = true

driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&useSSL=true&serverTimezone=GMT%2B8&allowMultiQueries=true
username: root
password: ******