Question

我有以下查询。当我直接在MySQL中运行查询时，会获得所有信息，但是当我在PHP脚本中运行相同的查询时，它将丢失一些信息。我首先在MySQL中运行查询，以确保获得所需的一切，然后将查询复制到我的php脚本中。谁能帮忙吗？

$get_attendance_profile_stmt = $conn->prepare('SELECT
p_info.fname AS \'First name\',
p_info.lname AS \'Lastname\',
stud_info.t_belt_id,
t_b.short_descr,
t_b.long_descr, 
stud_info.h_belt_id,
h_b.short_descr,
h_b.long_descr,

AB.*,
ROUND(
    (
        AB.Considered_Attended / AB.Classes_Tought * 100
    ),
    0
) AS \'Attendance %\'
FROM
(
SELECT
    student_id,
    SUM(
        CASE WHEN attendance_reason = 1 THEN 1 ELSE 0
    END
    ) AS \'Sick\',
    SUM(
    CASE WHEN attendance_reason = 2 THEN 1 ELSE 0
    END
    ) AS \'Injured\',
    SUM(
    CASE WHEN attendance_reason = 3 THEN 1 ELSE 0
    END
    ) AS \'Work\',
    SUM(
    CASE WHEN attendance_reason = 4 THEN 1 ELSE 0
    END
    ) AS \'School\',
    SUM(
    CASE WHEN attendance_reason = 5 THEN 1 ELSE 0
    END
    ) AS \'Did not attend\',
    SUM(
    CASE WHEN attendance_reason = 6 THEN 1 ELSE 0
    END
    ) AS \'Present\',
    SUM(
    CASE WHEN attendance_reason != 5 THEN 1 ELSE 0
    END
    ) AS \'Considered_Attended\',
    MAX(DateCounter) AS \'Classes_Tought\'
    FROM
    attendance a
    JOIN(
    SELECT COUNT(
        DISTINCT CONVERT(creation_date, DATE)
    ) AS DateCounter
    FROM
    attendance
    WHERE
    creation_date <= (SELECT DATE_SUB(NOW(), INTERVAL -6 MONTH))
    ) DT
    WHERE
    creation_date <= (SELECT DATE_SUB(NOW(), INTERVAL -1 MONTH))
    GROUP BY
    student_id
    ) AB
    JOIN student_info stud_info ON
    stud_info.student_id = AB.student_id
    JOIN users u ON
    stud_info.uid = u.uid
    JOIN personal_info p_info ON
    u.uid = p_info.uid
    LEFT JOIN t_belts t_b ON 
    stud_info.t_belt_id = t_b.t_belt_id
    LEFT JOIN h_belts h_b ON
    stud_info.h_belt_id = h_b.h_belt_id
    WHERE
    u.account_status = \'Active\'');

我在MySQL内部运行查询的输出是这样的：

php中查询的输出如下所示：

任何帮助将不胜感激。

Answer 1

PHP数组需要具有唯一索引。您的查询返回2个具有相同名称的列，因此第二个值就是您所获得的值（它们在赋值过程中覆盖了第一个值，简单的示例https://3v4l.org/sbs41）。从屏幕截图中可以看到，第二列为空。在第一列（或第二列）上使用别名，以便您在PHP中的索引是唯一的。例如

SELECT
p_info.fname AS \'First name\',
p_info.lname AS \'Lastname\',
stud_info.t_belt_id,
t_b.short_descr,
t_b.long_descr, 
stud_info.h_belt_id,
h_b.short_descr as short_descr_dontcare,
h_b.long_descr as long_descr_dontcare

或

SELECT
p_info.fname AS \'First name\',
p_info.lname AS \'Lastname\',
stud_info.t_belt_id,
t_b.short_descr  as short_descr_real,
t_b.long_descr as long_descr_real, 
stud_info.h_belt_id,
h_b.short_descr,
h_b.long_descr

使用后一种方法，您需要使用_real修改PHP数组中的索引。

PHP和MySQL查询输出不同

1 个答案: