mysql - 我需要在结果集中打印变量

Question

我需要能够将输入变量转换为日期时间或时间戳 - 然后将其作为 select 语句的一部分发送回结果集。我准备了下面的代码，当然它不起作用 - 无论 Unix 时间是什么，它都会向我发送 1970-01-01 。这些是我尝试发送到结果集的片段:

FROM_UNIXTIME(startDate,"%Y-%m-%d") AS 起始日期， FROM_UNIXTIME(endDate,"%Y-%m-%d") AS 结束日期

CREATE PROCEDURE reportFreeCoolingTracker (
        IN fromDate varchar (50),
        IN toDate varchar (50),
        IN timeZone varchar (50))

    BEGIN
            DECLARE startDate varchar (50);
            DECLARE endDate varchar (50);


             SET startDate = FROM_UNIXTIME(fromDate/1000);
             SET endDate = FROM_UNIXTIME(toDate/1000);

 SELECT g.groupId,
    g.name AS groupName,
    g1.parentId AS parentId1, 
    g1.name AS group1Name,
    g2.parentId AS parentId2, 
    g2.name AS group2Name,
    g3.parentId AS parentId3,
    g3.name AS group3Name,
    l.logId,l.name AS logName,
    l.ordering AS logOrder,
    a.activityId AS activityId,
    a.ordering AS activityOrder,
    a.name AS activityName,
    l1.recordId,
    l1.started, l1.completed,
    l1.userId,l1.note,
    u.name,
    TO_SECONDS(t2.completed) - TO_SECONDS(l1.completed) AS timeInSeconds,
    substr(l.details, instr(l.details , ':' ) +1)AS charge,l.details,
    i.itemId,
    i.name AS itemName,
    i.itemType,
    i.details,l1.item31985,l1.item31987,
    (l1.item31985 - l1.item31987) AS kwDifference,
    ((l1.item31985 - l1.item31987) *  (substr(l.details, instr(l.details , ':' ) +1))) AS cost,
    (((l1.item31985 - l1.item31987) *  (substr(l.details, instr(l.details , ':' ) +1)))
    *(time_to_sec(timediff(t2.completed, l1.completed)) / 3600)) AS costT,
      time_to_sec(timediff(t2.completed, l1.completed)) / 3600 AS coolingHours,
      time_to_sec(timediff(endDate, startDate)) / 3600 AS totalTimeRange,
    FROM_UNIXTIME(startDate,"%Y-%m-%d") AS startingDate, 
    FROM_UNIXTIME(endDate,"%Y-%m-%d") AS endingDate

  FROM logs l 
      INNER JOIN groups g ON g.groupId = l.groupId
      LEFT JOIN groups g1 ON g.parentId = g1.groupId
      LEFT JOIN groups g2 ON g1.parentId = g2.groupId
      LEFT JOIN groups g3 ON g2.parentId = g3.groupId                
      INNER JOIN activities a ON l.logId = a.logId 
      INNER JOIN log1644 l1 ON a.activityId = l1.activityId 
      INNER JOIN log1644 t2 ON t2.recordId = l1.recordid + 1
      INNER JOIN items i ON l.logId = i.logId AND i.name LIKE '## KW%'
      INNER JOIN users u ON l1.userId = u.userId AND i.name LIKE '## KW%'
     WHERE i.itemID = "31985"  AND  l1.activityId = 1257
      AND l1.started
        BETWEEN startDate
            AND endDate
     ORDER BY l1.started;
    END //

DELIMITER ;

Answer 1

你必须删除

SET startDate = FROM_UNIXTIME(fromDate/1000);
SET endDate = FROM_UNIXTIME(toDate/1000);

因为 unix 时间戳以毫秒为单位，并在 SELECT 中使用为

FROM_UNIXTIME(fromDate,"%Y-%m-%d") AS startingDate, 
FROM_UNIXTIME(toDate,"%Y-%m-%d") AS endingDate