SQL Server 2008 - 将 AuditLog table 迁移到每个 table

Question

我正在尝试将数据从许多 table 引用的 AuditLog table 迁移到 table 本身。我有一个 table、TablesWithAuditLogs，其中包含每个需要迁移的 table 的物理 table 名称。我很难确定仅 SQL 是否可行。

假设我有这五个 table，其中 3 个需要从 AuditLog.CreatedOn 列迁移到 self.CreatedOn 列（实际上更像是 80 table小号):

AuditLog
--------
ID:     CreatedOn:
1       2015-01-02
2       2015-03-04
3       2015-05-06
4       2014-02-01
5       2010-01-01
6       2011-03-04

TablesWithAuditLogs
-------------------
ID:     TableName:
41      'Contacts'
42      'Addresses'
43      'Items'

Contacts
--------
ID:     AuditLogId:   CreatedOn:
10      1             null
11      3             null

Addresses
---------
ID:     AuditLogId:   CreatedOn:
20      4             null
21      5             null

Items
-----
ID:     AuditLogId:   CreatedOn:
30      2             null
31      6             null

SQL 语句的预期结果为：

Contacts
--------
ID:     AuditLogId:   CreatedOn:
10      1             2015-01-02
11      3             2015-05-06

Addresses
---------
ID:     AuditLogId:   CreatedOn:
20      4             2014-02-01
21      5             2010-01-01

Items
-----
ID:     AuditLogId:   CreatedOn:
30      2             2015-03-04
31      6             2011-03-04

然后我可以从 80 个 table 中的每一个中删除 AuditLogId 列，并完全删除 AuditLog table。任何建议将不胜感激！

Answer 1

您可以使用 CURSOR 和 Dynamic SQL:

DECLARE @sql VARCHAR(MAX) = ''
DECLARE @tableName VARCHAR(100)

DECLARE cur CURSOR LOCAL FORWARD_ONLY FOR
    SELECT TableName FROM TablesWithAuditLogs

OPEN cur
FETCH FROM cur INTO @tableName

WHILE @@FETCH_STATUS = 0 BEGIN
    SELECT @sql ='
    UPDATE t
        SET t.CreatedOn = a.CreatedOn
    FROM [' + @tableName + '] t
    INNER JOIN AuditLog a
        ON a.ID = t.AuditLogID'

    EXEC(@sql)

    FETCH FROM cur INTO @tableName
END

CLOSE cur
DEALLOCATE cur

结果

Contacts
----------------------------------
ID          AuditLogID  CreatedOn
----------- ----------- ----------
10          1           2015-01-02
11          3           2015-05-06

Addresses
----------------------------------
ID          AuditLogID  CreatedOn
----------- ----------- ----------
20          4           2014-02-01
21          5           2010-01-01

Items
----------------------------------
ID          AuditLogID  CreatedOn
----------- ----------- ----------
30          2           2015-03-04
31          6           2011-03-04

SQL FIDDLE

SQL Server 2008 - 将 AuditLog table 迁移到每个 table

SQL Server 2008 - Migrating AuditLog table to each table

sql

database

sql-server

data-migration