?
①為什么要使用存儲過程?
因為它比SQL語句執行快.
②存儲過程是什么?
把一堆SQL語句羅在一起,還可以根據條件執行不同SQL語句.(AX寫作本文時觀點)
③來一個最簡單的存儲過程
CREATE PROCEDURE dbo.testProcedure_AX
AS
select userID from USERS order by userid desc
注:dbo.testProcedure_AX是你創建的存儲過程名,可以改為:AXzhz等,別跟關鍵字沖突就行了.AS下面就是一條SQL語句,不會寫SQL語句的請回避.
④我怎么在ASP.NET中調用這個存儲過程?
下面黃底的這兩行就夠使了.
??????? public static string GetCustomerCName(ref ArrayList arrayCName,ref ArrayList arrayID)
??????? {
??????????? SqlConnection con=ADConnection.createConnection();
??????????? SqlCommand cmd=new SqlCommand("testProcedure_AX",con);
??????????? cmd.CommandType=CommandType.StoredProcedure;
??????????? con.Open();
??????????? try
??????????? {
??????????????? SqlDataReader dr=cmd.ExecuteReader();
??????????????? while(dr.Read())
??????????????? {
??????????????????? if(dr[0].ToString()=="")
??????????????????? {
??????????????????????? arrayCName.Add(dr[1].ToString());
??????????????????? }
??????????????? }
??????????????? con.Close();
??????????????? return "OK!";
??????????? }
??????????? catch(Exception ex)
??????????? {
??????????????? con.Close();
??????????????? return ex.ToString();
??????????? }
??????? }
注:其實就是把以前
SqlCommand cmd=new SqlCommand("select userID from USERS order by userid desc",con);
中的SQL語句替換為存儲過程名,再把cmd的類型標注為CommandType.StoredProcedure(存儲過程)
⑤寫個帶參數的存儲過程吧,上面這個簡單得有點慘不忍睹,不過還是蠻實用的.
參數帶就帶兩,一個的沒面子,太小家子氣了.
CREATE PROCEDURE dbo.AXzhz
/*
這里寫注釋
*/
@startDate varchar(16),
@endDate varchar(16)
AS
?select id? from table_AX where commentDateTime>@startDate and commentDateTime<@endDate order by contentownerid DESC
注:@startDate varchar(16)是聲明@startDate 這個變量,多個變量名間用【,】隔開.后面的SQL就可以使用這個變量了.
⑥我怎么在ASP.NET中調用這個帶參數的存儲過程?
?public static string GetCustomerCNameCount(string startDate,string endDate,ref DataSet ds)
{
??????????? SqlConnection con=ADConnection.createConnection();
//-----------------------注意這一段--------------------------------------------------------------------------------------------------------
??????????? SqlDataAdapter da=new SqlDataAdapter("AXzhz",con);
??????????? para0=new SqlParameter("@startDate",startDate);
??????????? para1=new SqlParameter("@endDate",endDate);
??????????? da.SelectCommand.Parameters.Add(para0);
??????????? da.SelectCommand.Parameters.Add(para1);
??????????? da.SelectCommand.CommandType=CommandType.StoredProcedure;
//-------------------------------------------------------------------------------------------------------------------------------
??????????? try
??????????? {
??????????????? con.Open();
??????????????? da.Fill(ds);
??????????????? con.Close();
??????????????? return "OK";
??????????? }
??????????? catch(Exception ex)
??????????? {
??????????????? return ex.ToString();
??????????? }???????????
??????? }
注:把命令的參數添加進去,就OK了
鳥的,改字體顏色的東西太垃圾了,改不好,大家湊活著看.
⑦我還想看看SQL命令執行成功了沒有.
注意看下面三行紅色的語句
CREATE PROCEDURE dbo.AXzhz
/*
? @parameter1 用戶名
? @parameter2 新密碼
*/
@password nvarchar(20),
@userName nvarchar(20)
AS
declare @err0 int
update WL_user set password=@password where UserName=@userName
set @err0=@@error
select? @err0 as err0
注:先聲明一個整型變量@err0,再給其賦值為@@error(這個是系統自動給出的語句是否執行成功,0為成功,其它為失敗),最后通過select把它選擇出來,某位高人說可以通過Return返回,超出本人的認知范圍,俺暫時不會,以后再補充吧
⑧那怎么從后臺獲得這個執行成功與否的值呢?
下面這段代碼可以告訴你答案:
??? public static string GetCustomerCName()
??????? {
??????????? SqlConnection con=ADConnection.createConnection();
???????????
??????????? SqlCommand cmd=new SqlCommand("AXzhz",con);
??????????? cmd.CommandType=CommandType.StoredProcedure;
??????????? para0=new SqlParameter("@startDate","2006-9-10");
??????????? para1=new SqlParameter("@endDate","2006-9-20");
??????????? da.SelectCommand.Parameters.Add(para0);
??????????? da.SelectCommand.Parameters.Add(para1);
??????????? con.Open();
??????????? try
??????????? {
?????????????? Int32 re=(int32)cmd.ExecuteScalar();
??????????????? con.Close();
??????????????? if (re==0)
???????????????? return "OK!";
??????????????? else
???????????????? return "false";
??????????? }
??????????? catch(Exception ex)
??????????? {
??????????????? con.Close();
??????????????? return ex.ToString();
??????????? }
??????? }
注:就是通過SqlCommand的ExecuteScalar()方法取回這個值,這句話是從MSDN上找的,俺認為改成:
???? int re=(int)cmd.ExecuteScalar();? 99%正確,現在沒時間驗證,期待您的測試!!!
⑨我要根據傳入的參數判斷執行哪條SQL語句!!~
下面這個存儲過程可以滿足我們的要求,竟然是Pascal/VB的寫法,Begin----End ,不是{},,,對使用C#的我來說,這個語法有點惡心.........
ALTER PROCEDURE dbo.selectCustomerCNameCount
@customerID int
AS
if @customerID=-1
?begin
?select contentownerid ,userCName,count(*) as countAll from view_usercomment group by contentownerid,userCName order by contentownerid DESC
?end
else
?begin
?select contentownerid ,userCName,count(*) as countAll from view_usercomment where contentownerid=@customerID group by contentownerid,userCName order by contentownerid DESC
?end
好了,俺的水平只止于此,也夠菜鳥們喝一壺的了,還有更多東西等著我們去發現,無盡的征途!!!!!!!!!!!
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