时间:2021-09-27 09:43:43 | 栏目:Oracle | 点击:次
优点比较
sys_refcursor,可以在存储过程中作为参数返回一个table格式的结构集(我把他认为是table类型,容易理解,其实是一个游标集), cursor 只能用在存储过程,函数,包等的实现体中,不能做参数使用。
sys_refcursor 这东西可以使用在包中做参数,进行数据库面向对象开放。哈哈。我喜欢。cursor就不能。
create or replace procedure p_test(p_cur out sys_refcursor) as begin open p_cur for select * from emp; end p_test; declare p_cur sys_refcursor; i emp%rowtype; begin p_test(p_cur); loop fetch p_cur into i; exit when p_cur%notfound; DBMS_OUTPUT.PUT_LINE('---'||i.ename||'---'||i.empno); end loop; close p_cur; end;
补充:Oracle存储过程返回select * from table结果
1.首先建立一个包
create or replace package LogOperation is type listLog is ref cursor; procedure PCenterExamine_sel(listCenterExamine out listlog,testlist out listLog,numpage in decimal); end;
2.建立包中的主体
create or replace package body LogOperation is procedure PCenterExamine_sel ( listCenterExamine out listlog, testlist out listlog, numpage in decimal ) as begin open listCenterExamine for select * from Log_CenterExamine; open testlist for select * from Log_CenterExamine; end; end;
3.在程序中调用存储过程的值
public static DataSet RunProcedureGetDataSet(string storedProcName, OracleParameter[] parameters) { string connectionString ="192.168.1.1/db"; using (OracleConnection connection = new OracleConnection(connectionString)) { DataSet dataSet = new DataSet(); connection.Open(); OracleDataAdapter sqlDA = new OracleDataAdapter(); sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters); sqlDA.Fill(dataSet, "dt"); connection.Close(); return dataSet; } }
private static OracleCommand BuildQueryCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters) { OracleCommand command = new OracleCommand(storedProcName, connection); command.CommandType = CommandType.StoredProcedure; foreach (OracleParameter parameter in parameters) { command.Parameters.Add(parameter); } return command; }
4.有几个out的ref cursor,变量ds中就用几个DataTable。并且输入参数 indecimal也不会受影响,并且可以参加存储过程的运算
OracleParameter[] paramDic = { new OracleParameter("listCenterExamine",OracleType.Cursor), new OracleParameter("testlist",OracleType.Cursor), new OracleParameter("numpage",OracleType.Int32)}; paramDic[0].Direction = ParameterDirection.Output; paramDic[1].Direction = ParameterDirection.Output; paramDic[2].Value = 1; ds = Model.OracleHelper.RunProcedureGetDataSet("LogOperation.PCenterExamine_sel", paramDic);