用.NET调用oracle存储过程返回记录集

2/9/2008来源:Oracle教程人气:5844

Oracle存储过程返回记录集,要害之处是要用游标。 关于数据库的游标(cursor)大家肯定都接触不少,我们可以通过OPEN,FETCH,CLOSE操作控制游标进行各种方便的操作,这方面的例子我就不在重复了。我们现在要介绍的是游标变量(cursor variable)。类似游标,游标变量也是指向一个查询结果集的当前行。不同的是,游标变量能为任何类型相似(type-compatible)的查询打开,而并不是绑定到某一个特定的查询。通过游标变量,你可以在数据库的数据提取中获得更多的方便。 首先是建立表:
     CREATE TABLE LIHUAN.BILL_POINTS   (     POINTS_ID NUMBER(10,0) NOT NULL,     CUSTOMER_ID NUMBER(10,0) NOT NULL,     BILL_POINT_NO NUMBER(2,0) DEFAULT 1 NOT NULL,     CONSTRAINT PK_BILL_POINTS PRIMARY KEY (POINTS_ID)   )   /
   其次,建PACKAGE
  CREATE OR REPLACE PACKAGE LIHUAN.YY_PKG_BILL_POINT_NO/*取得用户的所有计费电序号*/   IS   TYPE T_CURSOR IS REF CURSOR;        PROCEDURE BILL_POINT_NO(P_CUSTOMER_ID BILL_POINTS.CUSTOMER_ID%TYPE,     Re_CURSOR OUT T_CURSOR);   END;   /
   再次,建PACKAGE BODY
  CREATE OR REPLACE PACKAGE BODY LIHUAN.YY_PKG_BILL_POINT_NO/*取得用户的所有计费电序号*/   IS      PROCEDURE BILL_POINT_NO(P_CUSTOMER_ID BILL_POINTS.CUSTOMER_ID%TYPE,     Re_CURSOR OUT T_CURSOR)     IS     V_CURSOR T_CURSOR;     BEGIN      OPEN V_CURSOR FOR         select Bill_Point_No from BILL_POINTS where CUSTOMER_ID =P_CUSTOMER_ID;         Re_CURSOR := V_CURSOR;     END;   END;   /
   最后,在.NET中程序调用。
  public DataSet Bill_Point_No(string CUSTOMER_ID)//ok    {     DataSet dataset = new DataSet();     Hashtable HT=new Hashtable();     HT.Add("P_CUSTOMER_ID",CUSTOMER_ID);     if(RunProcedure("Re_CURSOR",OracleType.Cursor,ref dataset, HT,bmsOracleUser+".YY_PKG_BILL_POINT_NO.BILL_POINT_NO", bmsOracleConnectionString))     {     ;     }     else     {     dataset=null;     }     return dataset;    }      public bool RunProcedure(string ReturnParameter, OracleType ParamType,ref DataSet Dataset,Hashtable HT , string ProcedureName,string OracleConnection)    {     System.Data.OracleClient.OracleConnection dsconnection = new System.Data.OracleClient.OracleConnection(OracleConnection);     System.Data.OracleClient.OracleCommand dacommand = new System.Data.OracleClient.OracleCommand(ProcedureName,dsconnection);     dsconnection.Open();     dacommand.CommandType=CommandType.StoredProcedure;     IDictionaryEnumerator Enumerator;     Enumerator = HT.GetEnumerator();     object Value=null;     OracleParameter OracleParam;     OracleParam = dacommand.Parameters. Add(new OracleParameter(ReturnParameter,ParamType));     OracleParam.Direction = ParameterDirection.Output;     while(Enumerator.MoveNext())     {     Value = Enumerator.Value;     OracleParam=dacommand.Parameters. Add(new OracleParameter (Enumerator.Key.ToString(), Value));     }     OracleDataAdapter ODAdapter=new OracleDataAdapter(dacommand);         try     {     ODAdapter.Fill(Dataset);      return true;     }     catch(System.Exception e)     {     e.ToString();     return false;     }     finally     {     HT.Clear();     dacommand.Parameters.Clear();     dsconnection.Close();     }   }