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
(
@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
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