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 '.user_id from t_user,t_article
解决：
这种错误是sql写错了，一般在near中所示例的sql语句之前有错误，而不是在near提示的sql中有错误