根据数据库批量生成实体类

执行存储过程：exec p_db_wsp @dbname='数据库名',@path='实体类存放路径',@namespace='实体类命名空间'

创建存储过程p_db_wsp:
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
 
alter proc [dbo].[p_db_wsp]
@dbname varchar(50),   --数据库名
@path varchar(100),    --实体类所在目录名，如D:/My/Models
@namespace varchar(50) --实体类命名空间,默认值为Models
as
--判断数据库是否存在
if(db_id(@dbname)is not null)
begin
if(isnull(@namespace,'')='')
set @namespace='Models'
-- 允许配置高级选项
EXEC sp_configure 'show advanced options', 1
-- 重新配置
RECONFIGURE
-- 启用Ole Automation Procedures 
EXEC sp_configure 'Ole Automation Procedures', 1
-- 启用xp_cmdshell,可以向磁盘中写入文件
EXEC sp_configure 'xp_cmdshell', 1
-- 重新配置
RECONFIGURE
declare @dbsql varchar(1000),@tablename varchar(100)
set @dbsql='declare wsp cursor for select name from '+@dbname+'..sysobjects where xtype=''u''  and name <>''sysdiagrams'''
exec(@dbsql)
open wsp
fetch wsp into @tablename--使用游标循环遍历数据库中每个表
while(@@fetch_status=0)
begin
--根据表中字段组合实体类中的字段和属性
declare @nsql nvarchar(4000),@sql varchar(8000)
set @nsql='select @s=isnull(@s+char(9)+''private '',''using System;'+char(13)+'using System.Collections.Generic;'
+char(13)+'using System.Text;'+char(13)+'namespace '+@namespace+char(13)+
'{'+char(13)+char(9)+'public class '+@tablename+char(13)+'{''+char(13)+char(9)+''private '')+
case when a.name in(''image'',''uniqueidentifier'',''ntext'',''varchar'',''ntext'',''nchar'',''nvarchar'',''text'',''char'') then ''string''
when a.name in(''tinyint'',''smallint'',''int'',''bigint'') then ''int''
when a.name in(''datetime'',''smalldatetime'') then ''DateTime''
when a.name in(''float'',''decimal'',''numeric'',''money'',''real'',''smallmoney'') then ''decimal''
when a.name =''bit'' then ''bool''
else a.name end+'' ''+lower(''_''+b.name)+'';''+char(13)+char(9)+''public ''+
case when a.name in(''image'',''uniqueidentifier'',''ntext'',''varchar'',''ntext'',''nchar'',''nvarchar'',''text'',''char'') then ''string''
when a.name in(''tinyint'',''smallint'',''int'') then ''int''
when a.name=''bigint'' then ''long''
when a.name in(''datetime'',''smalldatetime'') then ''DateTime''
when a.name in(''float'',''decimal'',''numeric'',''money'',''real'',''smallmoney'') then ''decimal''
when a.name =''bit'' then ''bool''
else a.name end
+'' ''+b.name+char(13)+char(9)+''{''+char(13)+char(9)+char(9)+''get{return ''+lower(''_''+b.name)+'';}''+
char(13)+char(9)+char(9)+''set{''+lower(''_''+b.name)+''=value;}''+char(13)+char(9)+''}''+char(13)
from '+@dbname+'..syscolumns b,
(select distinct name,xtype from '+@dbname+'..systypes where status=0) a
where a.xtype=b.xtype and b.id=object_id('''+@dbname+'..'+@tablename+''')'
exec sp_executesql @nsql,N'@s varchar(8000) output',@sql output
set @sql=@sql+char(9)+'}'+char(13)+'}'
--print @sql
DECLARE @err INT,@fso INT,@fleExists BIT,@file VARCHAR(100)
SET @file=@path+'/'+@tablename+'.cs'
EXEC @err=sp_OACreate 'Scripting.FileSystemObject',@fso OUTPUT
EXEC @err=sp_OAMethod @fso, 'FileExists',@fleExists OUTPUT,@file
EXEC @err = sp_OADestroy @fso
 
IF @fleExists!=0
exec('exec xp_cmdshell ''del '+@file+'''') --存在则删除
exec('exec xp_cmdshell ''echo '+@sql+' > '+@file+'''') --将文本写进文件中
set @sql=null
fetch wsp into @tablename
end
close wsp
deallocate wsp
print '生成成功！'
end
else
print '数据库不存在！'