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根据存储过程名字生成ADO.NET数据库访问代码

作者: PerfectDesign , 　出处:blog,　责任编辑: 李书琴,　

2008-01-21 11:46

以下是引用片段：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[sqltoolforexcuteandadapter]

(

@objName nvarchar(100),--存储过程名称

@isexcute int --是否为execute 或者是sqladapter 0是execute,1是sqladapter

)

SET NOCOUNT ON

DECLARE @parameterCount int

DECLARE @errMsg varchar(100)

DECLARE @parameterAt varchar(1)

DECLARE @connName varchar(100)

DECLARE @outputValues varchar(100)

--Change the following variable to the name of your connection instance

SET @connName='conn.Connection'

SET @parameterAt=''

SET @outputValues=''

SELECT

dbo.sysobjects.name AS ObjName,

dbo.sysobjects.xtype AS ObjType,

dbo.syscolumns.name AS ColName,

dbo.syscolumns.colorder AS ColOrder,

dbo.syscolumns.length AS ColLen,

dbo.syscolumns.colstat AS ColKey,

dbo.syscolumns.isoutparam AS ColIsOut,

dbo.systypes.xtype

INTO #t_obj

FROM

dbo.syscolumns INNER JOIN

dbo.sysobjects ON dbo.syscolumns.id = dbo.sysobjects.id INNER JOIN

dbo.systypes ON dbo.syscolumns.xtype = dbo.systypes.xtype

WHERE

(dbo.sysobjects.name = @objName)

AND

(dbo.systypes.status <> 1) --不理解这个不等于1是干嘛的？在sql帮助中也没有啊？

ORDER BY

dbo.sysobjects.name,

dbo.syscolumns.colorder

SET @parameterCount=(SELECT count(*) FROM #t_obj)

IF(@parameterCount<1) SET @errMsg='No Parameters/Fields found for ' + @objName

IF(@errMsg is null)

BEGIN

print 'SqlConnection conn = new SqlConnection("");

SqlCommand com = new SqlCommand("'+@objName+'", conn);'

print 'com.CommandType = CommandType.StoredProcedure;'

PRINT ' SqlParameter[] Parameters = new SqlParameter[' +

cast(@parameterCount as varchar) + '];'

PRINT ''

DECLARE @source_name nvarchar,

@source_type varchar,

@col_name nvarchar(100),

@col_order int,

@col_type varchar(20),

@col_len int,

@col_key int,

@col_xtype int,

@col_redef varchar(20),

@col_isout tinyint

DECLARE cur CURSOR FOR

SELECT * FROM #t_obj

OPEN cur

-- Perform the first fetch.

FETCH NEXT FROM cur INTO

@source_name,@source_type,@col_name,@col_order,@col_len,@col_key,@col_isout,@col_xtype

if(@source_type=N'U') SET @parameterAt='@'

-- Check @@FETCH_STATUS to see if there are any more rows to fetch.

WHILE @@FETCH_STATUS = 0

BEGIN

SET @col_redef=(SELECT CASE @col_xtype

WHEN 34 THEN 'Image'

WHEN 35 THEN 'Text'

WHEN 36 THEN 'UniqueIdentifier'

WHEN 48 THEN 'TinyInt'

WHEN 52 THEN 'SmallInt'

WHEN 56 THEN 'Int'

WHEN 58 THEN 'SmallDateTime'

WHEN 59 THEN 'Real'

WHEN 60 THEN 'Money'

WHEN 61 THEN 'DateTime'

WHEN 62 THEN 'Float'

WHEN 99 THEN 'NText'

WHEN 104 THEN 'Bit'

WHEN 106 THEN 'Decimal'

WHEN 122 THEN 'SmallMoney'

WHEN 127 THEN 'BigInt'

WHEN 165 THEN 'VarBinary'

WHEN 167 THEN 'VarChar'

WHEN 173 THEN 'Binary'

WHEN 175 THEN 'Char'

WHEN 231 THEN 'NVarChar'

WHEN 239 THEN 'NChar'

ELSE '!MISSING'

END AS C)

--Write out the parameter

PRINT ' Parameters[' + cast(@col_order-1 as varchar)

+ '] = new SqlParameter("' + @parameterAt + @col_name

+ '", SqlDbType.' + @col_redef

+ ');'

--Write out the parameter direction it is output

IF(@col_isout=1)

BEGIN

PRINT ' Parameters['+ cast(@col_order-1 as varchar)

+'].Direction=ParameterDirection.Output;'

SET @outputValues=@outputValues+' ?=Parameters['+

cast(@col_order-1 as varchar) +'].Value;'

END

ELSE

BEGIN

--Write out the parameter value line

PRINT ' Parameters['+ cast(@col_order-1 as varchar) + '].Value = ?;'

END

--If the type is a string then output the size declaration

IF(@col_xtype=231)OR(@col_xtype=167)OR(@col_xtype=175)OR(@col_xtype=99)OR(@col_xtype=35)

BEGIN

PRINT ' Parameters[' + cast(@col_order-1 as varchar) +

'].Size=' + cast(@col_len as varchar) + ';'

END

-- This is executed as long as the previous fetch succeeds.

FETCH NEXT FROM cur INTO

@source_name,@source_type,@col_name,@col_order,

@col_len,@col_key,@col_isout,@col_xtype

END

PRINT ''

print ' com.Parameters.AddRange(Parameters);'

if @isexcute = 0 --使用的execute方法执行sql语句

begin

print 'try

{

conn.Open();

com.ExecuteNonQuery();

}

catch (Exception ee)

{

throw ee;

}

finally

{

conn.Close();

end

else if @isexcute = 1--需要返回数据集的话使用这个

begin

print 'try

{

da.Fill(ds);

}

catch (Exception ee)

{

throw ee;

}

finally

{

//do what you want to do or dispose resoures.

end

CLOSE cur

DEALLOCATE cur

END

if(LEN(@errMsg)>0) PRINT @errMsg

DROP TABLE #t_obj

SET NOCOUNT ON
测试代码： sqltoolforexcuteandadapter 'YourProcName',1--or 0
显示出啦的结果是：
SqlConnection conn = new SqlConnection("");

            SqlCommand com = new SqlCommand("YourProcName", conn);
com.CommandType = CommandType.StoredProcedure;
   SqlParameter[] Parameters = new SqlParameter[1];

   Parameters[0] = new SqlParameter("@yourparam", SqlDbType.VarChar);
   Parameters[0].Value = ?;
   Parameters[0].Size=6;

       com.Parameters.AddRange(Parameters);
try

{

da.Fill(ds);

}

catch (Exception ee)

{

throw ee;

}

finally

{

//do what you want to do or dispose resoures.

}

　　这样非常方便，而且不用以后手写非常多的参数了，参数指定了精确的长度和类型，速度更快。