Question

我有一个存储过程，我试图从我的PHP调用。这是存储过程：

BEGIN
DECLARE done INT DEFAULT FALSE;
declare phone_temp VARCHAR(20) default '';
declare phone_cur cursor for SELECT DISTINCT sentNum FROM Queue;
declare continue handler for not found set done = true;

#create temp table
create temporary table if not exists temp_return AS SELECT * FROM Queue LIMIT 0;
#empty if exists
delete from temp_return;

open phone_cur;

phone_loop: LOOP
    fetch phone_cur into phone_temp;
    if done then
        leave phone_loop;
    end if;

   insert into temp_return SELECT * FROM Queue WHERE num2=phone_temp LIMIT 2;
   insert into temp_return SELECT * FROM Queue WHERE num1=phone_temp LIMIT 1;
end loop phone_loop;
close phone_cur;

select * from temp_return;

drop table if exists temp_return;
END

直接在mysql工作台中，调用它有效。在PHP中，它不起作用。这是我的php：

function grabFromSmsQueue(){
    global $myStmt, $conn;
    if(isset($myStmt)){
        $myStmt -> execute();
    }
    else{
        $query = "CALL myStoredProc();";
        $myStmt = $conn->stmt_init();
        $myStmt -> prepare($query);
        $myStmt -> execute();

    }
    $result = $myStmt -> get_result();
    //print_r ($result);
    $info = [];
    if(isset($result)){
        while($data = $result->fetch_assoc()){
            $info[] = $data;
        }
    }
    return $info;
}

像这样连接，我收到以下错误

The localhost page isn’t working
localhost didn’t send any data.
ERR_EMPTY_RESPONSE

我将问题追溯到$data = $result->fetch_assoc()的问题，因为当我发表评论并放入print_r时，我会收到实际返回的内容，即mysqli_result Object ( [current_field] => 0 [field_count] => 9 [lengths] => [num_rows] => 0 [type] => 1 )。我得出的结论是它不起作用，因为[num_rows] => 0。

现在，回到我的存储过程，我拿出了游标的所有提及并用硬编码值替换它，它在workbench和php中都有效。我已经验证通过php连接的用户有权限，连接是打开的，并且相同的代码可以执行其他存储过程（不包括游标的存储过程）。这是否意味着我不能在php调用的存储过程中使用游标？是否有游标的替代品？我错过了我的php语法中的一些东西来处理游标吗？

Answer 1

基于3个分组的聊天讨论，这为测试数据提供了SQLFiddle（那里没有太多数据）。

由于测试数据的滑动窗口中now()与该数据相关，因此以下变量用于＆＃34;冻结＆＃34; now()。只是为了便于测试和验证输出。

所以，最终放弃并改变使用它的代码中的4个引用（注意Group 3使用它两次）。

now()变量：

select @theNow:=now();
-- REM OUT the following line. It is used only for testing (as now will chg, your data won't)
select @theNow:='2016-06-23 14:00:00';

查询：

select id,sentNum,message,sentTime,startAtTime,sentByTime,msgType,theGrp from
(   select id,sentNum,message,sentTime,startAtTime,sentByTime,msgType,theGrp,
    if(sentNum!=@lastSentNum,greatest(@sentNumChg:=1,0),least(@sentNumChg:=0,1)) as dummy1,
    if(theGrp!=@lastGrp,greatest(@grpChg:=1,0),least(@grpChg:=0,1)) as dummy2,
    if(@sentNumChg=1 or @grpChg=1,@seqNum:=1,@seqNum:=@seqNum+1) as seqNum,
    @lastSentNum:=sentNum as setLast01,
    @lastGrp:=theGrp as setLast02
    from
    (   -- GROUP 1: sentByTime<=now(), INVITE
        select `id`, `sentNum`, `message`, `sentTime`, `startAtTime`, `sentByTime`, `msgType`, 1 as theGrp
        from SmsQueue
        where sentByTime<=@theNow and msgType='invite'
        UNION ALL
        -- GROUP 2 startAtTime<=now(), BROADCAST
        select `id`, `sentNum`, `message`, `sentTime`, `startAtTime`, `sentByTime`, `msgType`, 2 as theGrp
        from SmsQueue
        where startAtTime<=@theNow and msgType='broadcast'
        UNION ALL
        -- GROUP 3: sentByTime>now() && startAtTime<=now(), INVITE
        select `id`, `sentNum`, `message`, `sentTime`, `startAtTime`, `sentByTime`, `msgType`, 3 as theGrp
        from SmsQueue
        where sentByTime>@theNow and startAtTime<=@theNow and msgType='invite'
    ) d1
    cross join (select @sentNumChg:=0,@grpChg:=0,@lastSentNum:='',@lastGrp:=0,@seqNum:=0) as xParams
    order by sentNum,theGrp,sentByTime,id -- id is the tie-break
) d2
where (theGrp=1 and seqNum<3) or (theGrp=2 and seqNum=1) or (theGrp=3 and seqNum=1)
order by sentNum,theGrp;

输出（我的客户端工具目前受到文字挑战）：

请参阅我在this的答案顶部的一般评论，以获取高级变量用法。

使用PHP

1 个答案: