在程序開發中,我們經常要做的事就是訪問資料庫.有時候會調用存儲過程和DTS,下面就此給出例子來說明如何實現
第一部分 調用存儲過程(帶入參數和取得返回值)
1.調用SQL Server的存儲過程
假如我們有如下一個存儲過程,很簡單的實現,只是將兩個傳進來值做加法處理然後返回
CREATE PROCEDURE AddMethoD以下是在c#中調用此存儲過程的代碼
(
@returnvalue int OUTPUT, --返回結果
@Parameter_1 int, --參數一
@Parameter_2 int --參數二
)
AS
-----------------------------------------------
set @returnvalue = @Parameter_1 + @Parameter_2
RETURN @returnvalue
-------------------------------------------------
GO
private int TestProcedure()
{
System.Random rnd = new Random();
string constr = "Data Source=localhost;initial catalog=testdb;user id=sa;password=sa;connect timeout=3000";
SqlConnection conn = new SqlConnection(constr);
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "AddMethod";
cmd.CommandType = CommandType.StoredProcedure;
//參數一
SqlParameter parameter_1 = new SqlParameter("@Parameter_1",SqlDbType.Int);
parameter_1.Direction = ParameterDirection.Input;
parameter_1.Value = (int)(rnd.NextDouble() * 100);
//參數二
SqlParameter parameter_2 = new SqlParameter("@Parameter_2",SqlDbType.Int);
parameter_2.Direction = ParameterDirection.Input;
parameter_2.Value = (int)(rnd.NextDouble() * 100);
//返回值
SqlParameter returnValue = new SqlParameter("@returnValue",SqlDbType.Int);
returnValue.Direction = ParameterDirection.Output;
cmd.Parameters.Add(returnValue);
cmd.Parameters.Add(parameter_1);
cmd.Parameters.Add(parameter_2);
try
{
cmd.ExecuteNonQuery();
}
finally
{
conn.Close();
}
return (int)returnValue.Value;
}
2.調用Oralce的存儲過程
先創建一個package和package body,代碼如下
(1).PackageCREATE OR REPLACE package TestPackage is
type mytype is ref cursor;
procedure p_Test(mycs out mytype);
function f_get(str in varchar2) return varchar2;
end;(2).Package Bodies
create or replace package body TestPackage is
procedure p_Test(mycs out mytype) is
begiN
open mycs for
select * from dual;
end p_Test;
function f_get(str varchar2) return varchar2 is
str_temp varchar2(100) := 'good luck !';
begiN
str_temp := str_temp || str;
return str_temp;
end f_get;
end;以上建好了存儲過程和方法,現在看下如何在c#中實現調用.
先來個調用方法的
private string TestFunction()
{
string constr = "Data source=E4MT;user id=sa;password=sa";
OracleConnection conn = new OracleConnection(constr);
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = "TestPackage.f_get";
cmd.CommandType = CommandType.StoredProcedure;
OracleParameter parameter_1 = new OracleParameter("str",OracleType.VarChar,100);
parameter_1.Direction = ParameterDirection.Input;
parameter_1.Value = "This is just a test";
OracleParameter parameter_2 = new OracleParameter("result",OracleType.VarChar,100);
parameter_2.Direction = ParameterDirection.ReturnValue;
cmd.Parameters.Add(parameter_1);
cmd.Parameters.Add(parameter_2);
try
{
cmd.ExecuteNonQuery();
}
finally
{
conn.Close();
}
return parameter_2.Value.ToString();
}
再來個調用存儲過程的,返回的是個數據集
private DataSet TestProc()
{
string constr = "Data source=E4MT;user id=sa;password=sa";
OracleConnection conn = new OracleConnection(constr);
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = "TestPackage.p_Test";
cmd.CommandType = CommandType.StoredProcedure;
OracleParameter parameter_1 = new OracleParameter("mycs",OracleType.Cursor);
parameter_1.Direction = ParameterDirection.Output;
cmd.Parameters.Add(parameter_1);
DataSet ds = new DataSet();
try
{
OracleDataAdapter da = new OracleDataAdapter(cmd);
da.Fill(ds,"test");
}
finally
{
conn.Close();
}
return ds;
}
以上介紹了在c#中分別調用sql 和oracle的存儲的方法
第二部分 C#調用 sql server 的DTS
目前知道有兩種比較適用的方法:
(1).調用DTSRun命令來跑DTS.此種方法調用到了Master..xp_cmdshell擴展存儲過程,故需要將調用的用戶開通能訪問此擴展存儲過程的權限.
private void TestRunDTS()
{
string constr = "Data Source=localhost;initial catalog=master;user id=sa;password='';connect timeout=3000";
SqlConnection conn = new SqlConnection(constr);
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "exec master..xp_cmdshell 'DTSRun /~Z0x8E9EF55158ABA56C3C3346137F1F7B7B090F1F61D54D3981CFA1DB0E8B50C4E0D416AF2F746FA482B5E3C2AABA52D4838DAA496938F1E61155CBB055FF4082181E6BE53F08A47D7E6A82E6B77E3F83FCBAAD1B'";
try
{
cmd.ExecuteNonQuery();
}
finally
{
conn.Close();
}
}
注意看上面標紅色的部分,exec是來報告存儲過程的,xp_cmdshell 及後面的一長串代碼就是存儲過程及參數.dtsrun其實是dos下的命令.後面跟的是DTS Package的ID.這個可以將DTS排成排程然後在屬性中查看到.
(2)第二種方法就要用到Microsoft提供的一個COM類.
直接提供下載吧:Microsoft.SQLServer.DTSPkg80.dll
用的是LoadFromSQLServer()方法
private void TestDTS()
{
Package2Class package = new Package2Class();
object pVarPersistStgOfHost = null;
package.LoadFromSQLServer("localhost", "sa", "",DTSSQLServerStorageFlags.DTSSQLStgFlag_DefaulT
,null,null,null,"DTSTest", ref pVarPersistStgOfHost);
package.Execute();
package.UnInitialize();
package = null;
}
參數說明:LoadFromSQLServer參數分別是:ServerName,userID,password,DTSSQLServerStorageFlags,PackagePassword,PackageGuid,PackageVersionGuid,PackageName
第三部分:SQL Server 存儲過程中調用DTS
DECLARE @object int
DECLARE @hr int
DECLARE @src varchar(255), @desc varchar(255)
--生成對象
print 'start to create DTS.Pachage'
EXEC @hr = sp_OACreate 'DTS.Package', @object OUTPUT
if @hr <> 0
BEGIN
print 'error create DTS.Package'
EXEC sp_OAGetErrorInfo @object, @src OUT, @desc OUT
SELECT hr=convert(varbinary(4),@hr), Source=@src, Description=@desc
RETURN
END
print 'create DTS.Pachage successful'
--調用方法
print 'start to LoadFromSQLServer'
EXEC @hr = sp_OAMethod @object, 'LoadFromSQLServer',NULL,
@ServerName='localhost', @PackageName='testdts', @Flags=256
IF @hr <> 0
BEGIN
print 'error LoadFromSQLServer'
EXEC sp_OAGetErrorInfo @object, @src OUT, @desc OUT
SELECT hr=convert(varbinary(4),@hr), Source=@src, Description=@desc
RETURN
END
print 'LoadFromSQLServer successful'
--設置全局屬性(如果DTS有的話)
print 'start to set property'
EXEC @hr = sp_OASetProperty @object, 'GlobalVariables("var_1").Value',123
IF @hr <> 0
BEGIN
print 'error set property'
EXEC sp_OAGetErrorInfo @object, @src OUT, @desc OUT
SELECT hr=convert(varbinary(4),@hr), Source=@src, Description=@desc
RETURN
END
print 'set property successful'
--運行DTS
print 'start to execute'
exec @hr = sp_OAMethod @object,'Execute'
if @hr <> 0
begiN
print 'Execute Failed'
EXEC sp_OAGetErrorInfo @object, @src OUT, @desc OUT
SELECT hr=convert(varbinary(4),@hr), Source=@src, Description=@desc
returN
enD
print 'Execute Successful'
--銷毀對象
EXEC @hr = sp_OADestroy @objecT
IF @hr <> 0
BEGIN
PRINT 'Destroy Package failed'
EXEC sp_OAGetErrorInfo @object, @src OUT, @desc OUT
SELECT hr=convert(varbinary(4),@hr), Source=@src, Description=@desc
RETURN
END
print 'destroy successful'
GO
以上介紹了調用存儲過程及DTS的方法,可靈活應用於程式開發中.
