 
--創(chuàng)建測試表 
CREATE TABLE [dbo].[Student]( 
[ID] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY, 
[Name] [nvarchar](20) NOT NULL DEFAULT (''), 
[Age] [int] NOT NULL DEFAULT (0), 
[Sex] [bit] NOT NULL DEFAULT (0), 
[Address] [nvarchar](200) NOT NULL DEFAULT ('') 
) 
--比如是一個查詢存儲過程 
Create PROC GetStudentByType 
@type int =0, -- 1根據(jù)id查詢, 2根據(jù)性別查詢 
@args XML -- 參數(shù)都寫到這里吧 
AS 
BEGIN 
DECLARE @id INT,@sex BIT 
SET @id=@args.value('(args/id)[1]','int') --參數(shù)都可以寫在這里，如果沒有傳過來，大不了是null值了，反正也用不到，沒關(guān)系的 
SET @sex =@args.value('(args/sex)[1]','bit') 
IF(@type=1) 
BEGIN 
SELECT * FROM dbo.Student WHERE ID=@id 
END 
IF(@type=2) 
BEGIN 
SELECT * FROM dbo.Student WHERE Sex=@sex 
END 
END 

參數(shù)寫xml里感覺比用字符串要好很多，這樣調(diào)用時參數(shù)就不好組織了，所以這里要有個幫助類XmlArgs

復(fù)制代碼代碼如下:

 
public class XmlArgs 
{ 
private string _strArgs = string.Empty; 
private bool _isCreate = false; 
private Dictionary<string, string> _args; 
public string Args 
{ 
get 
{ 
if (!_isCreate) 
{ 
_strArgs = _CreateArgs(); 
_isCreate = true; 
} 
return _strArgs; 
} 
} 
public XmlArgs() 
{ 
_args = new Dictionary<string, string>(); 
} 
public void Add(string key, object value) 
{ 
_args.Add(key, value.ToString()); 
_isCreate = false; 
} 
public void Remove(string key) 
{ 
_args.Remove(key); 
_isCreate = false; 
} 
public void Clear() 
{ 
_args.Clear(); 
_isCreate = false; 
} 
private string _CreateArgs() 
{ 
if (_args.Count == 0) 
{ 
return string.Empty; 
} 
StringBuilder sb = new StringBuilder(); 
foreach (string key in _args.Keys) 
{ 
sb.AppendFormat("<{0}>{1}</{0}>", key, _args[key]); 
} 
return sb.ToString(); 
} 
} 

調(diào)用：

復(fù)制代碼代碼如下:

 
private void BindData() 
{ 
XmlArgs args = new XmlArgs(); 
args.Add("id", 1); 
System.Data.DataTable dt = GetStudentByType(1, args); 
GridView1.DataShow(dt); 
} 
private System.Data.DataTable GetStudentByType(int type, XmlArgs args) 
{ 
SqlHelper helper = new SqlHelper(); 
helper.Params.Add("type", type); 
helper.Params.Add("args", args.Args); 
System.Data.DataTable dt = helper.RunDataTable("GetStudentByType"); 
return dt; 
} 