从存储过程,返回OUT参数和OUT游标和解析结果(Oracle)

Question

问题:是否可以使用OUT返回:

两者:变量和A光标,从我的代码下面？

---

我在SqlDB上看到了一个类似的问题,但经过一段很长的搜索后发现没有OracleDB的解决方案.

在PLSQL中:

CREATE OR REPLACE
PROCEDURE SPGETRESULTANDSETFLAG
(
 pFilter VARCHAR2,
 pMaxRowCount VARCHAR2,
 pTableID RAW,
 myFlag OUT NUMBER,
 myCursor OUT types.cursorType
)
AS
BEGIN
 Declare
  CountQuery VARCHAR(20000) := '';
  DataQuery VARCHAR(20000) := '';
  ResultingRows NUMBER := -1;
 Begin
  myFlag := -1;

  CountQuery := 'SELECT COUNT(*) FROM ' 
                || F_GET_TABLENAME_FROM_ID(PTABLEID => pTableID)
                || ' WHERE ' || pFilter;
  EXECUTE IMMEDIATE CountQuery INTO ResultingRows;


  --Get the Return Value
  if( pMaxRowCount > ResultingRows ) then myFlag := 1; end if;


  DataQuery := 'SELECT * FROM '
                || F_GET_TABLENAME_FROM_ID(PTABLEID => pTableID) 
                || ' WHERE ' || pFilter; 
  --Get the Return Cursor
  Open myCursor for DataQuery;

 End;
END SPGETRESULTANDSETFLAG;

---

在代码背后..

Database db = DBSingleton.GetInstance();
using (DbCommand command = db.GetStoredProcCommand(spName))
{
    //The three Add In Parameters... & then the Add out Parameter as below
    db.AddOutParameter(command, "myFlag", System.Data.DbType.Int32, LocVariable );
    using ( IDataReader reader = db.ExecuteReader(command))
    {
         //Loop through cursor values & store them in code behind class-obj(s)
    }
}

---

我认为这是不可能的,因为我如何读取值和光标,因为..

如果只有标志param out然后我会使用db.ExecuteNonQuery(..) &如果只有光标,那么我将使用db.ExecuteReader(..)

Answer 1

是的,可以有多个输出参数.这是我用来在c#中调用Oracle存储过程的示例:

OracleParameter op = null;
OracleDataReader dr = null;

/* custom code here. Yours would look a little different */
OracleCommand cmd = (OracleCommand) this.FactoryCache.Connection.CreateCommand();

cmd.CommandText = "pkg_prov_index.getNextPanel";
cmd.CommandType = CommandType.StoredProcedure;

op = new OracleParameter("pCurrentPanelId", OracleType.VarChar);
op.Direction = ParameterDirection.Input;
op.Value = masterProviderIndex.CurrentPanelId;
cmd.Parameters.Add(op);

op = new OracleParameter("pRefCursor", OracleType.Cursor);
op.Direction = ParameterDirection.Output;
cmd.Parameters.Add(op);

op = new OracleParameter("pReturnCode", OracleType.Number);
op.Direction = ParameterDirection.Output;
op.Size = 5;
cmd.Parameters.Add(op);

op = new OracleParameter("pReturnMessage", OracleType.VarChar);
op.Direction = ParameterDirection.Output;
op.Size = 4000;
cmd.Parameters.Add(op);

cmd.ExecuteNonQuery();

returnCode = Convert.ToInt16(cmd.Parameters[2].Value);
returnMessage = cmd.Parameters[3].Value.ToString();

dr = (OracleDataReader) cmd.Parameters[1].Value;

while (dr.Read()) {
}

Answer 2

谢谢你的回答

我真的非常渴望得到一个有效的结果，并且以某种方式找到了一个解决方案，并且在阅读了一些内容后发现了它为什么有效：

Oracle 存储过程保持原样，没有任何更改。

代码隐藏 - 更改如下：

Database db = DBSingleton.GetInstance();
using (DbCommand command = db.GetStoredProcCommand(spName))
{
    //The three Add In Parameters... & then the Add out Parameter as below
    db.AddOutParameter(command, "myFlag", System.Data.DbType.Int32, LocVariable );
    using ( IDataReader reader = db.ExecuteReader(command))
    {
         //Loop through cursor values & store them in code behind class-obj(s)
         //The reader must be closed before trying to get the "OUT parameter"
         reader.Close();

         //Only after reader is closed will any parameter result be assigned
         //So now we can get the parameter value.
         //if reader was not closed then OUT parameter value will remain null
         //Getting the parameter must be done within this code block
         //I could not get it to work outside this code block
         <Type> result = (typecast)command.Parameters["OUT_parameter_name"];
    }
}
//I USED THIS APPROACH TO RETURN MULTIPLE PARAMETERS ALONG WITH THE CURSOR READ