Mysql实现不用sql拼接进行多条件查询

在不用框架或者字符串拼接的状况下，实现多条件查询web sql语句：SELECT * FROM studentsql 若是字段非空。正常传入：sql：SELECT * FROM student where stuno like ‘xx’ and pwd like ‘xx’ and id like ‘xx’数据库 若是字段为空。在后端转成"%" 。则查询sql：SELECT * FROM stude

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