java – MySql连接器j允许用户变量

请帮助我找出如何允许mysql连接器j定义用户变量并使此代码有效：

    Statement s = conn.createStatement();
    s.executeQuery ("set @categoryId := (Select CategoryId from categories order by CategoryId desc LIMIT 1);\n" +
                        "set @categoryId := IF(@categoryId is Null, 1, @categoryId);");

现在它引发了一个异常：

MysqLSyntaxErrorException occured : 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 @categoryId := IF(@categoryId is Null, 1, @categoryId)' at line 2

我知道在.net中你可以在连接字符串中定义“允许用户变量=真”选项.如何在java中做到这一点？

解决方法:

我发现了如何使它工作.只需设置datasource属性allowMultiQueries = true

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