我箍你可以帮助我。我在 Visual Studio 2013 SDDT 项目的 Schemacomparetool 中使用 Skriptgeneration。我的问题是我需要更新一个不为空的表。
Schemacompartool 做到了这一点:
/*
The type for column Bundesland in table [dbo].[Arbeitsfreiertag] is currently VARCHAR (50) NULL but is being changed to BIGINT NULL. Data loss could occur.
*/
IF EXISTS (select top 1 1 from [dbo].[Arbeitsfreiertag])
RAISERROR (N'Rows were detected. The schema update is terminating because data loss might occur.', 16, 127) WITH NOWAIT
GO
...
PRINT N'Altering [dbo].[Arbeitsfreiertag]...';
GO
ALTER TABLE [dbo].[Arbeitsfreiertag] ALTER COLUMN [Bundesland] BIGINT NULL;
我还需要像 Managment Studio Designer 更改这样的更改脚本:
/* To prevent any potential data loss issues, you should review this script in detail before running it outside the context of the database designer.*/
BEGIN TRANSACTION
SET QUOTED_IDENTIFIER ON
SET ARITHABORT ON
SET NUMERIC_ROUNDABORT OFF
SET CONCAT_NULL_YIELDS_NULL ON
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
COMMIT
BEGIN TRANSACTION
GO
CREATE TABLE dbo.Tmp_Arbeitsfreiertag
(
ID bigint NOT NULL,
Bundesland bigint NULL,
Name varchar(50) NOT NULL,
ArbeitsfreiertagTyp bigint NOT NULL,
Beginn datetime NOT NULL,
Beschreibung varchar(200) NULL,
Ende datetime NULL,
Land bigint NOT NULL,
Wiederholend int NOT NULL
) ON [PRIMARY]
GO
ALTER TABLE dbo.Tmp_Arbeitsfreiertag SET (LOCK_ESCALATION = TABLE)
GO
IF EXISTS(SELECT * FROM dbo.Arbeitsfreiertag)
EXEC('INSERT INTO dbo.Tmp_Arbeitsfreiertag (ID, Bundesland, Name, ArbeitsfreiertagTyp, Beginn, Beschreibung, Ende, Land, Wiederholend)
SELECT ID, CONVERT(bigint, Bundesland), Name, ArbeitsfreiertagTyp, Beginn, Beschreibung, Ende, Land, Wiederholend FROM dbo.Arbeitsfreiertag WITH (HOLDLOCK TABLOCKX)')
GO
DROP TABLE dbo.Arbeitsfreiertag
GO
EXECUTE sp_rename N'dbo.Tmp_Arbeitsfreiertag', N'Arbeitsfreiertag', 'OBJECT'
GO
ALTER TABLE dbo.Arbeitsfreiertag ADD CONSTRAINT
PK_Arbeitsfreiertag PRIMARY KEY CLUSTERED
(
ID
) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
COMMIT
我需要一个选项来在 ShemaCompartool 中设置它。
我希望你能理解我的问题。
谢谢史蒂芬