MyBatis Java和MySql局部变量

Question

我是Java世界的新手。我有一个简单的查询问题：

<insert id="create" parameterType="models.entities.CategoryEntity">

    set @catId := (select categoryId from Categories limit 1);
     insert into Categories(CategoryId, Title, LeftValue, RightValue)
    values(@catId, 'Test in', 1,2);
   ....
</insert>

当我尝试使用mybatis运行它时，它只是失败了：

PersistenceException occured : ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 'insert into Categories(CategoryId, Title, LeftValue, RightValue) values(' at line 2 ### The error may involve Category.create-Inline ### The error occurred while setting parameters ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 'insert into Categories(CategoryId, Title, LeftValue, RightValue) values(' at line 2

如果我删除此行：

set @catId := (select categoryId from Categories limit 1);

那一切都还好 我究竟做错了什么？jdbc或mybatis是否有问题？如何在Mybatis中使用mysql @variables？有人有在Mybatis中使用MySql局部变量的示例吗？

Answer 1

我发现了如何使其工作。只需设置数据源属性allowMultiQueries = true

jdbc:mysql://localhost:3306/DBS?allowMultiQueries=true