Sql觸發器的父子

Question

我想制定出創建觸發器的最佳方式，但是我用命令sql server 2008打了一堵磚牆我希望創建一箇中央表，用於存儲所有應該包含的電話號碼（數字）客戶表中的所有客戶號碼。 Numbers有一個子表號numbercustomer，它將一個號碼鏈接到一個或多個客戶。 我的表：

CREATE TABLE [Campaign].[Number](
    [NumberID] [int] IDENTITY(1,1) NOT NULL, 
    [Number] [varchar](15) NOT NULL, 
    [LastUpdated] [timestamp] NOT NULL, 
CONSTRAINT [Pk_Number] PRIMARY KEY CLUSTERED 
(
    [NumberID] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 

CREATE TABLE [Campaign].[NumberCustomer](
    [CustomerNumberID] [int] IDENTITY(1,1) NOT NULL, 
    [NumberID] [int] NOT NULL, 
    [CustomerID] [int] NOT NULL, 
CONSTRAINT [PK_CustomerNumber] PRIMARY KEY CLUSTERED 
(
    [CustomerNumberID] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 

CREATE TABLE [Crm].[Customer](
    [CustomerID] [int] IDENTITY(30000,1) NOT NULL, 
    [FirstName] [varchar](255) NULL, 
    [LastName] [varchar](255) NULL, 
    [MobileNumber] [varchar](11) NULL, 
    [LandlineNumber] [varchar](11) NULL, 
CONSTRAINT [PK__Customer__8CB286B91CF15040] PRIMARY KEY CLUSTERED 
(
    [CustomerID] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 

我想觸發檢查該號碼錶並插入的數目，如果它不存在。觸發器的第二部分shuld然後檢查並插入，如果不存在與客戶的鏈接。 我可以得到數字表來更新與觸發如下bbut但我關於性能。

CREATE TRIGGER [Crm].[Customer_Number_Updated] ON [Crm].[Customer] 
AFTER Update, INSERT 
NOT FOR REPLICATION AS 
SET NoCount On 

DECLARE 
    @AuditTime DATETIME, 
    @IsDirty BIT 
SET @AuditTime = GetDate() 

SET @IsDirty = 0 

    Begin Try 
    INSERT INTO 
     [Campaign].[Number]([Number]) 
    select 
     number 
    from 
    (
    Select 
     i.MobileNumber as number 
    From 
     inserted i 
    join 
     deleted d 
    on 
     i.CustomerID = d.CustomerID 
    and 
    isnull(i.MobileNumber ,'') <> isnull(d.MobileNumber,'') 
    UNION 
    Select 
     i.LandlineNumber as number 
    From 
     inserted i 
    join 
     deleted d 
    on 
     i.CustomerID = d.CustomerID 
    and 
    isnull(i.LandlineNumber ,'') <> isnull(d.LandlineNumber,'') 
    UNION 
    Select 
     i.AlternateContactNumber as number 
    From 
     inserted i 
    join 
     deleted d 
    on 
     i.CustomerID = d.CustomerID 
    and 
    isnull(i.AlternateContactNumber ,'') <> isnull(d.AlternateContactNumber,'') 
    ) as nums 
    WHERE NOT EXISTS 
     (
      SELECT 
       * 
      FROM 
       [Campaign].[Number] cn 
      WHERE 
       cn.Number = nums.number 
     ) 
End try 
Begin Catch 
IF ERROR_NUMBER() <> 2627 
    DECLARE @ErrorMessage NVARCHAR(4000), @ErrorSeverity INT, @ErrorState INT; 
    SET @ErrorMessage = ERROR_MESSAGE(); 
    SET @ErrorSeverity = ERROR_SEVERITY(); 
    SET @ErrorState = ERROR_STATE(); 
    RAISERROR(@ErrorMessage,@ErrorSeverity,@ErrorState) with log; 
End Catch 

GO 

任何幫助將不勝感激？

羅布

Answer 1

你觸發適用於更新，但不是INSERT：你是加盟刪除和插入，當你插入新記錄，沒有什麼被刪除。 你應該在你的觸發器中做INSERT和UPDATE，或者做一個MERGE。

下面是一個代碼插入和更新（僅在try塊中的代碼）

插入做了左與刪除的加入，並檢查ID爲空（抗半加盟，等於沒有texists）。

更新做一個內部聯接插入檢查更新記錄只有

Begin Try 

    -- insert new records 
    INSERT INTO 
     [Campaign].[Number]([Number]) 
    select 
     i.MobileNumber 
    from inserted i 
    left join deleted d on i.customerid = d.customerid 
    where d.customerid is null -- new records (no deleted record) 
    and not exists(select Number from [Campaign].[Number] c where c.number = i.MobileNumber) 
    -- union the same for LAndLineNumber 
    -- union the same for AlternateNumber 

    -- update existing number 
    update [Campaign].[Number] 
     set Number = i.MobileNumber 
     -- set LandLineNumber too 
     -- and AlternateNumber 
    from [Campaign].[Number] n 
     left join deleted d on d.MobileNumber = n.Number 
     inner join inserted i on i.CustomerId = d.CustomerId 

End try