用.NET调用Oracle存储过程返回记录集---------转载
oracle的存储过程返回记录集,关键之处是要用游标。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(); } } |