使用MYSQL php yii2检查开始时间和结束时间是否部分重叠？

Question

伙计们 我一直在试图弄清楚如何检查两次之间的部分重叠。 基本上，我的时间保存在这样的数据库中：-

Batch::find()->alias('batch')->joinWith([
            'batchTeachers as teacher',
            'attendanceDates as attendanceDates',
            'batchTiming as batchTiming'
        ])->where([
            'OR', [
                'IN',
                'teacher.teacher_id',
                $teacher_id
            ],
            [
                'IN',
                'batch.teacher_id',
                $teacher_id
            ]
        ])->andWhere([
            'attendanceDates.date' => $date
        ])->andWhere([
            'OR',
            [
                'AND',
                [
                    '>=',
                    'batchTiming.start_time',
                    $calenderStartTime
                ],
                [
                    '<=',
                    'batchTiming.end_time',
                    $calenderEndTime
                ]

            ], [
                'AND', [
                    '<=',
                    'attendanceDates.start_time',
                    $calenderEndTime
                ], [
                    '>=',
                    'attendanceDates.end_time',
                    $calenderEndTime
                ]
            ]

        ])->exists()

上述查询的原始 SQL 为：

SELECT `batch`.* FROM `tbl_batch` `batch` LEFT JOIN `tbl_attendance_batch_teacher` `teacher` ON `batch`.`id` = `teacher`.`batch_id` LEFT JOIN `tbl_attendance_date` `attendanceDates` ON `batch`.`id` = `attendanceDates`.`batch_id` LEFT JOIN `tbl_batch_timing` `batchTiming` ON `batch`.`id` = `batchTiming`.`batch_id` WHERE ((`teacher`.`teacher_id`=1294) OR (`batch`.`teacher_id`=1294)) AND (`attendanceDates`.`date`='2021-01-06') AND (((`batchTiming`.`start_time` >= '08:00:00') AND (`batchTiming`.`end_time` <= '09:00:00')) OR ((`attendanceDates`.`start_time` <= '09:00:00') AND (`attendanceDates`.`end_time` >= '09:00:00'))) ORDER BY `date`

我的问题是如果用户在上午 9 点到 11 点之间有批次

如果他从上午 9 点到 11 点忙，那么 满 重叠（红色）

如果他从上午 9 点到 10 点忙，则 部分 重叠（蓝色）

Answer 1

您需要在 SQL SELECT 中使用 CASE WHEN 语句

SELECT
    ` batch `.*,
        CASE
                WHEN ( ` batchTiming `.` start_time ` >= '08:00:00' AND ` batchTiming `.` end_time ` <= '09:00:00' ) THEN 1 -- partial overlap
                WHEN ( ` attendanceDates `.` start_time ` <= '09:00:00' AND ` attendanceDates `.` end_time ` >= '09:00:00' ) THEN 2 -- full overlap
                ELSE 0 -- no overlap
        END as overlap_value

FROM

参考here

进一步将其转换为 Active Query 添加 select 子句，如下所示...

Batch::find()
    ->alias('batch')
    ->select([ 'T.*', 'othrTable.*', ' CASE STATEMENT HERE as overlap_value'])
    ->joinWith( [...

并在批处理模型中添加 $overlap_value 作为属性。