Question

有我的查询字符串，bindParam有什么问题吗？

$str = "select A.option_id,count(*) as sum 
            from tb_feedback A,tb_question B,tb_group C 
            where (A.question_id=B.id) 
            and (:question is null or B.id=:question) 
            and (B.group_num=C.id) 
            and (:group is null or C.name=:group) 
            and (:fromdate is null or A.date >= CAST(:fromdate AS DATE)) 
            and (:todate is null or A.date <= CAST(:todate AS DATE)) 
            group by A.option_id";
        $sql = $this->conn->prepare($str);
        $sql->bindParam(':question', $obj['question']);
        $sql->bindParam(':group', $obj['group']);
        $sql->bindParam(':fromdate', $obj['fromdate']);
        $sql->bindParam(':todate', $obj['todate']);

Answer 1

我找到了参数的类型不是NULL的原因，它是字符串，所以在执行下一个语句时不成功 (:question is null or B.id=:question)

Mysql查询选项参数

1 个答案: