SQL SERVER 生成建表脚本（sql通过存储过程获取创建表脚本）
网上抄回来改进的，改进增加一个扩展字段的指定，用于生成的脚本可以改变表名称，而不用和原来的表一样。应用于分表时自动创建表的场景。
USE [Ctrl.Js]
GO
/****** Object: StoredProcedure [dbo].[GET_TableScript_MSSQL] Script Date: 09/17/2018 17:51:50 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
/*==============================================================
名称: GET_TableScript_MSSQL
功能: 获取customize单个表的mysql脚本
创建：2010年5月12日
参数：@DBNAME --数据库名称
@TBNAME --表名
@TBNAME_ext --可选项，留空表示原样生成脚本，非空，表示生成的脚本在原表名称后面加上后缀，同时约束、索引的名称也会以相同的方式加上后缀。
@SQL --输出脚本
==============================================================*/
ALTER PROCEDURE [dbo].[GET_TableScript_MSSQL] (
@DBNAME varchar(40),
@TBNAME VARCHAR(100),
@TBNAME_ext varchar(100)='',
@SQL VARCHAR(max) OUTPUT
) AS
declare @table_script nvarchar(max) --建表的脚本
declare @index_script nvarchar(max) --索引的脚本
declare @default_script nvarchar(max) --默认值的脚本
declare @check_script nvarchar(max) --check约束的脚本
declare @sql_cmd nvarchar(max) --动态SQL命令
declare @err_info varchar(200)
--SET @tbname = UPPER(@tbname);
if OBJECT_ID(@DBNAME+'.dbo.'+@TBNAME) is null
BEGIN
set @err_info='对象:'+@DBNAME+'.dbo.'+@TBNAME+'不存在!'
raiserror(@err_info,16,1)
return
END
----------------------生成创建表脚本----------------------------
--1.添加算定义字段
set @table_script = 'CREATE TABLE '+@TBNAME+@TBNAME_ext+'
('+char(13)+char(10);
--添加表中的其它字段
set @sql_cmd=N'
use '+@DBNAME+'
set @table_script=''''
select @table_script=@table_script+
'' [''+t.NAME+''] ''
+(case when t.xusertype in (175,62,239,59,122,165,173) then ''[''+p.name+''] (''+convert(varchar(30),isnull(t.prec,''''))+'')''
when t.xusertype in (231) and t.length=-1 then ''[ntext]''
when t.xusertype in (231) and t.length<>-1 then ''[''+p.name+''] (''+convert(varchar(30),isnull(t.prec,''''))+'')''
when t.xusertype in (167) and t.length=-1 then ''[text]''
when t.xusertype in (167) and t.length<>-1 then ''[''+p.name+''] (''+convert(varchar(30),isnull(t.prec,''''))+'')''
when t.xusertype in (106,108) then ''[''+p.name+''] (''+convert(varchar(30),isnull(t.prec,''''))+'',''+convert(varchar(30),isnull(t.scale,''''))+'')''
else ''[''+p.name+'']''
END)
+(case when t.isnullable=1 then '' null'' else '' not null ''end)
+(case when COLUMNPROPERTY(t.ID, t.NAME, ''ISIDENTITY'')=1 then '' identity'' else '''' end)
+'',''+char(13)+char(10)
from syscolumns t join systypes p on t.xusertype = p.xusertype
where t.ID=OBJECT_ID('''+@TBNAME+''')
ORDER BY t.COLID;
'
EXEc sp_executesql @sql_cmd,N'@table_script varchar(max) output',@sql_cmd output
set @table_script=@table_script+@sql_cmd
IF len(@table_script)>0
set @table_script=substring(@table_script,1,len(@table_script)-3)+char(13)+char(10)
+')'+char(13)+char(10)
+' '+char(13)+char(10)+char(13)+char(10)
--------------------生成索引脚本---------------------------------------
set @index_script=''
set @sql_cmd=N'
use '+@DBNAME+'
declare @ct int
declare @indid int --当前索引ID
declare @p_indid int --前一个索引ID
select @indid=-1, @p_indid=0,@ct=0 --初始化，以后用@indid和@p_indid判断是否索引ID发生变化
set @index_script=''''
select @indid=INDID
,@index_script=@index_script
+(case when @indid<>@p_indid and @ct>0 then '')''+char(13)+char(10)+'' ''+char(13)+char(10) else '''' end)
+(case when @indid<>@p_indid and UNIQ=''PRIMARY KEY''
then ''ALTER TABLE ''+TABNAME+'''+@TBNAME_ext+' ADD CONSTRAINT ''+name+'''+@TBNAME_ext+' PRIMARY KEY ''+cluster+char(13)+char(10)
+''(''+char(13)+char(10)
+'' ''+COLNAME+char(13)+char(10)
when @indid<>@p_indid and UNIQ=''UNIQUE''
then ''ALTER TABLE ''+TABNAME+'''+@TBNAME_ext+' ADD CONSTRAINT ''+name+'''+@TBNAME_ext+' UNIQUE ''+cluster+char(13)+char(10)
+''(''+char(13)+char(10)
+'' ''+COLNAME+char(13)+char(10)
when @indid<>@p_indid and UNIQ=''INDEX''
then ''CREATE ''+cluster+'''+@TBNAME_ext+' INDEX ''+name+'''+@TBNAME_ext+' ON ''+TABNAME+'''+@TBNAME_ext+'''+char(13)+char(10)
+''(''+char(13)+char(10)
+'' ''+COLNAME+char(13)+char(10)
when @indid=@p_indid
then '' ,''+COLNAME+char(13)+char(10)
END)
,@ct=@ct+1
,@p_indid=@indid
from
(
SELECT A.INDID,B.KEYNO
,NAME,(SELECT NAME FROM SYSOBJECTS WHERE ID=A.ID) AS TABNAME,
(SELECT NAME FROM SYSCOLUMNS WHERE ID=B.ID AND COLID=B.COLID) AS COLNAME,
(CASE WHEN EXISTS(SELECT 1 FROM SYSOBJECTS WHERE NAME=A.NAME AND XTYPE=''UQ'') THEN ''UNIQUE''
WHEN EXISTS(SELECT 1 FROM SYSOBJECTS WHERE NAME=A.NAME AND XTYPE=''PK'') THEN ''PRIMARY KEY''
ELSE ''INDEX'' END) AS UNIQ,
(CASE WHEN A.INDID=1 THEN ''CLUSTERED'' WHEN A.INDID>1 THEN ''NONCLUSTERED'' END) AS CLUSTER
FROM SYSINDEXES A INNER JOIN SYSINDEXKEYS B ON A.INDID=B.INDID AND A.ID=B.ID
WHERE A.ID=OBJECT_ID('''+@TBNAME+''') and a.indid<>0
) t
ORDER BY INDID,KEYNO'
EXEc sp_executesql @sql_cmd,N'@index_script varchar(max) output',@sql_cmd output
set @index_script=@sql_cmd
IF len(@index_script)>0
set @index_script=@index_script+')'+char(13)+char(10)+' '+char(13)+char(10)+char(13)+char(10)
--生成默认值约束
set @sql_cmd='
use '+@DBNAME+'
set @default_script=''''
SELECT @default_script=@default_script
+''ALTER TABLE ''+OBJECT_NAME(O.PARENT_OBJ)+'''+@TBNAME_ext+'''
+'' ADD CONSTRAINT ''+O.NAME+'''+@TBNAME_ext+' default ''+t.text+'' for ''+C.NAME+char(13)+char(10)
+'' ''+char(13)+char(10)
FROM SYSOBJECTS O INNER JOIN SYSCOMMENTS T ON O.ID=T.ID
INNER JOIN SYSCOLUMNS C ON O.PARENT_OBJ=C.ID AND C.CDEFAULT=T.ID
WHERE O.XTYPE=''D'' AND O.PARENT_OBJ=OBJECT_ID('''+@TBNAME+''')'
EXEc sp_executesql @sql_cmd,N'@default_script varchar(max) output',@sql_cmd output
set @default_script=@sql_cmd+char(13)+char(10)
set @SQL=@table_script+@index_script+@default_script
declare @len int,@n int
set @len=LEN(@SQL)
set @n=0
while(@len>0)
BEGIN
PRINT(substring(@SQL,@n*4000+1,4000));
set @n=@n+1
set @len=@len-4000;
END
示例：
DECLARE @SQL NVARCHAR(3000) EXEC GET_TableScript_MSSQL 'BusinessSystemDB','Swb_Yw_KeHuBase','_2021',@SQL OUT SELECT @SQL
