存储过程 动态为表生成自增ID

由于不希望把主键字段设置成自增字段的主键，我通过动态创建一张对应表对应

Create PROCEDURE [dbo].[proc_IdentityGetNewId]
(    
    @pTableName NVARCHAR(1000),
    @pIdentityId        bigint output
)
AS
DECLARE @StrSql NVARCHAR(4000),
        @ParameterList NVARCHAR(4000),
        @NewId        BIGINT    
BEGIN
    -- create Identity table
    IF not exists (SELECT 1 FROM  sysobjects WHERE  id = object_id('dbo.xx_Identity_' + @pTableName) and type = 'U')        
    BEGIN
        SET @StrSql = 'create table dbo.xx_Identity_' + @pTableName
        SET @StrSql = @StrSql  + ' ( IndentityId BIGINT identity )'        
        EXECUTE sp_executesql @StrSql
    END    
    set @StrSql = '
        -- insert new record
        INSERT dbo.xx_Identity_' + @pTableName + ' DEFAULT VALUES
        -- Retrieve identity
        SELECT @NewId = CONVERT(BIGINT, SCOPE_IDENTITY())
        -- Delete newly created record
        DELETE dbo.xx_Identity_' + @pTableName + ' WHERE IndentityId = @NewId'

    set @ParameterList = '@NewId bigint output'
    execute sp_executesql @StrSql, @ParameterList, @NewId output
    set @pIdentityId = @NewId
END