Question

此问题适用于SQL Server 2008：

当我更新以下任何字段时，我无法设置SyncRequired = 1.

我确信这是一件非常简单的事情，但我无法理解。

CREATE TRIGGER [core].[updCustomersSync] ON [core].[Customers]
    AFTER UPDATE
AS
    IF ( UPDATE(Addr1)
         OR UPDATE(Addr2)
         OR UPDATE(Addr3)
         OR UPDATE(Zip)
         OR UPDATE(Contact1)
         OR UPDATE(Phone1)
         OR UPDATE(email)
         OR UPDATE(CustomerName)
       ) 
        BEGIN
            UPDATE  c
            SET     c.SyncRequired = 1
            FROM    core.Customers c
                    JOIN inserted ins ON ins.ID = c.ID
            WHERE   c.[CustomerName] <> ins.[CustomerName]
                    OR c.[Addr1] <> ins.[Addr1]
                    OR c.[Addr2] <> ins.[Addr2]
                    OR c.[Addr3] <> ins.[Addr3]
                    OR c.[Zip] <> ins.[Zip]
                    OR c.[Contact1] <> ins.[Contact1]
                    OR c.[Phone1] <> ins.[Phone1]
                    OR c.[email] <> ins.[email]
        END

Answer 1

您正在创建AFTER更新，以便在其运行时客户应该更新。将您的逻辑更改为使用deleted而不是core.customers，它应该可以正常工作

Answer 2

正如我在评论中所建议的那样（以及@RobertSheahan的建议），您应该使用INSERTED和DELETED表。

CREATE TRIGGER [core].[updCustomersSync] ON [core].[Customers]
    AFTER UPDATE
AS
    /*  You can omit the IF statement.  Just let the UPDATE statement below do all the work. */
    --IF ( UPDATE(Addr1)
    --     OR UPDATE(Addr2)
    --     OR UPDATE(Addr3)
    --     OR UPDATE(Zip)
    --     OR UPDATE(Contact1)
    --     OR UPDATE(Phone1)
    --     OR UPDATE(email)
    --     OR UPDATE(CustomerName)
    --   ) 
BEGIN
    UPDATE core.Customers
    SET SyncRequired = 1
    WHERE ID IN
    (
        SELECT i.ID
        --I will assume for this example that ID is unique.
        FROM INSERTED I
        JOIN DELETED d 
            ON d.ID = i.ID

        --Why all the NULL comparisons?  Well, presumably, if someone updates an existing value to NULL,
        --or an existing value is NULL and a new value is provided, you want to know.  Right?
        WHERE   d.[CustomerName] <> i.[CustomerName] OR (d.[CustomerName] IS NULL AND i.[CustomerName] IS NOT NULL) OR (i.[CustomerName] IS NULL AND d.[CustomerName] IS NOT NULL)
        OR d.[Addr1] <> i.[Addr1] OR (d.[Addr1] IS NULL AND i.[Addr1] IS NOT NULL) OR (i.[Addr1] IS NULL AND d.[Addr1] IS NOT NULL)
        OR d.[Addr2] <> i.[Addr2] OR (d.[Addr2] IS NULL AND i.[Addr2] IS NOT NULL) OR (i.[Addr2] IS NULL AND d.[Addr2] IS NOT NULL)
        OR d.[Addr3] <> i.[Addr3] OR (d.[Addr3] IS NULL AND i.[Addr3] IS NOT NULL) OR (i.[Addr3] IS NULL AND d.[Addr3] IS NOT NULL)
        OR d.[Zip] <> i.[Zip] OR (d.[Zip] IS NULL AND i.[Zip] IS NOT NULL) OR (i.[Zip] IS NULL AND d.[Zip] IS NOT NULL)
        OR d.[Contact1] <> i.[Contact1] OR (d.[Contact1] IS NULL AND i.[Contact1] IS NOT NULL) OR (i.[Contact1] IS NULL AND d.[Contact1] IS NOT NULL)
        OR d.[Phone1] <> i.[Phone1] OR (d.[Phone1] IS NULL AND i.[Phone1] IS NOT NULL) OR (i.[Phone1] IS NULL AND d.[Phone1] IS NOT NULL)
        OR d.[email] <> i.[email] OR (d.[email] IS NULL AND i.[email] IS NOT NULL) OR (i.[email] IS NULL AND d.[email] IS NOT NULL)
    )
END

更新触发器后不会更新 - SQL Server 2008

2 个答案: