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  • SET IDENTITY_INSERT table_name ON

    Allows explicit values to be inserted into the identity column of a table.
    Syntax:
    SET IDENTITY_INSERT [ database_name . [ schema_name ] . ] table { ON | OFF }
    
    e.g.:
    USE AdventureWorks;
    GO
    -- Create tool table.
    CREATE TABLE dbo.Tool(
       ID INT IDENTITY NOT NULL PRIMARY KEY, 
       Name VARCHAR(40) NOT NULL
    )
    GO
    -- Inserting values into products table.
    INSERT INTO dbo.Tool(Name) VALUES ('Screwdriver')
    INSERT INTO dbo.Tool(Name) VALUES ('Hammer')
    INSERT INTO dbo.Tool(Name) VALUES ('Saw')
    INSERT INTO dbo.Tool(Name) VALUES ('Shovel')
    GO
    
    -- Create a gap in the identity values.
    DELETE dbo.Tool 
    WHERE Name = 'Saw'
    GO
    
    SELECT * 
    FROM dbo.Tool
    GO
    
    -- Try to insert an explicit ID value of 3;
    -- should return a warning.
    INSERT INTO dbo.Tool (ID, Name) VALUES (3, 'Garden shovel')
    GO
    -- SET IDENTITY_INSERT to ON.
    SET IDENTITY_INSERT dbo.Tool ON
    GO
    
    -- Try to insert an explicit ID value of 3.
    INSERT INTO dbo.Tool (ID, Name) VALUES (3, 'Garden shovel')
    GO
    
    SELECT * 
    FROM dbo.Tool
    GO
    -- Drop products table.
    DROP TABLE dbo.Tool
    GO
    
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  • 原文地址:https://www.cnblogs.com/wucg/p/2001847.html
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