sql 工作日触发日期范围

Question

我在 MSSQL(2012) 数据库上有 2 个表（"tblA" 和 "tblB"）。在 "tblA" 上插入后，我希望触发器在 "tblB" 上自动生成日期在 "tblA" 的 STARTDATE 和 ENDDATE 之间的记录，但仅在 "tblA"[=13 上选择的工作日=]

例如 "tblA":

tblA_ID: 99
CAT: TEXT1
STARTDATE: 01/01/2015
ENDDATE: 31/01/2015
MONDAY: true
TUESDAY: false
WEDNESDAY: false
THURSDAY: false
FRIDAY: true
SATURDAY: false
SUNDAY: false

"tblB" 应该得到

 1   99    TEXT1   02/01/2015 (=Friday)
 2   99    TEXT1   04/01/2015 (=Monday)
 3   99    TEXT1   09/01/2015 (=Friday)
 4   99    TEXT1   11/01/2015 (=Monday)
 5   99    TEXT1   16/01/2015 (=Friday)
 6   99    TEXT1   28/01/2015 (=Monday)
 7   99    TEXT1   23/01/2015 (=Friday)
 8   99    TEXT1   25/01/2015 (=Monday)
 9   99    TEXT1   30/01/2015 (=Friday)




    CREATE TABLE [dbo].[tblA]
(
    [tblA_ID] INT NOT NULL IDENTITY,
    [tblA_CAT] NVARCHAR(50) NULL, 
    [tblA_STARTDATE] DATE NULL, 
    [tblA_ENDDATE] DATE NULL, 
    [tblA_MONDAY] BIT NULL, 
    [tblA_TUESDAY] BIT NULL, 
    [tblA_WEDNESDAY] BIT NULL, 
    [tblA_THURSDAY] BIT NULL, 
    [tblA_FRIDAY] BIT NULL, 
    [tblA_SATURDAY] BIT NULL, 
    [tblA_SUNDAY] BIT NULL, 
    CONSTRAINT [PK_tblA] PRIMARY KEY ([tblA_ID]), 
)

CREATE TABLE [dbo].[tblB]
(
    [tblB_ID] INT NOT NULL IDENTITY,
    [tblA_ID] INT NOT NULL,
    [tblB_CAT] NVARCHAR(50) NULL, 
    [tblB_DATE] DATE NULL, 
    CONSTRAINT [PK_tblB] PRIMARY KEY ([tblB_ID]), 
)

Answer 1

这个触发器应该适合你。它使用递归通用 table 表达式来生成范围内的所有 tblB_DATE 值，然后使用 case 表达式来测试日期名称是否在标记为 true 的那些值中。请注意，这部分取决于系统语言，因此如果您不使用英语，则必须根据您的特定语言调整日期名称文字。

递归通用 table 表达式可替代日历 table，因此如果您有合适的 table 可以作为日期的来源，那么您可以使用相反（它应该提供更好的性能）。

另请注意，代码缺乏错误检查且未优化，因此可能会有所改进。它应该让您了解如何解决您的问题。

CREATE TRIGGER ins_tblb ON [dbo].[tblA] AFTER INSERT AS
BEGIN

    WITH dates AS (
       SELECT 
          tblA_ID, tbla_CAT, tbla_STARTDATE, tbla_ENDDATE, 
          tbla_MONDAY, tbla_TUESDAY, tbla_WEDNESDAY, tbla_THURSDAY, 
          tbla_FRIDAY, tbla_SATURDAY, tbla_SUNDAY,
          tblA_STARTDATE tblB_DATE
       FROM inserted
       UNION ALL 
       SELECT tblA_ID, tbla_CAT, tbla_STARTDATE, tbla_ENDDATE, 
          tbla_MONDAY, tbla_TUESDAY, tbla_WEDNESDAY, tbla_THURSDAY, 
          tbla_FRIDAY, tbla_SATURDAY, tbla_SUNDAY,
          DATEADD(DAY, 1, tblB_DATE) tblB_DATE
       FROM dates 
       WHERE dates.tblB_DATE <= tblA_ENDDATE
    ) 

    INSERT tblB (tblA_ID, tblB_CAT, tblB_DATE)
    SELECT tblA_ID, tblA_CAT, tblB_DATE
    FROM dates
    WHERE DATENAME(DW,tblB_DATE) IN (
       CASE WHEN tblA_MONDAY = 1 
          THEN N'Monday' END,
       CASE WHEN tblA_TUESDAY = 1 
          THEN N'Tuesday' END,
       CASE WHEN tblA_WEDNESDAY = 1 
          THEN N'Wednesday' END,
       CASE WHEN tblA_THURSDAY = 1 
          THEN N'Thursday' END,
       CASE WHEN tblA_FRIDAY = 1 
          THEN N'Friday' END,
       CASE WHEN tblA_SATURDAY = 1 
          THEN N'Saturday' END,
       CASE WHEN tblA_SUNDAY = 1 
          THEN N'Sunday' END
    )

    ORDER BY tblA_ID, tblB_DATE
    OPTION (MAXRECURSION 0)
END

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