firedac调用ORACLE的存储过程

firedac调用ORACLE的存储过程

EMB官方原文地址：http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Using_Oracle_with_FireDAC

笔者下面做的是中文翻译：

ORALCE的存储过程，相比MSSQL，多了一个PACKAGE（包）。

因此FIREDAC调用也稍有点不同。

ORACLE创建存储过程的样例脚本如下：

CREATE OR REPLACE PACKAGE FDQA_TestPack AS
  TYPE TVC2Tbl IS TABLE OF VARCHAR2(50) INDEX BY BINARY_INTEGER;
  PROCEDURE TestPLSQLArray(ATable in out TVC2Tbl);
END ADQA_testpack;
/

CREATE OR REPLACE PACKAGE BODY FDQA_TestPack AS
  PROCEDURE TestPLSQLArray(ATable IN OUT TVC2Tbl) IS
  BEGIN
    for i in ATable.First .. ATable.Last loop
      ATable(i) := '*' || ATable(i) || '*';
    end loop;
  END;
END FDQA_testpack;
/

firedac调用ORACLE存储过程的代码如下：

FDStoredProc1.PackageName := 'MYPACK';
FDStoredProc1.StoredProcName := 'CLNTPROC';
FDStoredProc1.Prepare;
FDStoredProc1.ParamByName('AREC$CLIENT_ID').Value := 100;
FDStoredProc1.ParamByName('AREC$NAME').Value := 'Client 1';
FDStoredProc1.ParamByName('AREC$ACT').Value := True;
FDStoredProc1.ExecProc;

　　调用ORACLE高级游标返回数据集

CREATE PROCEDURE TestRefCrs (ACrs1 IN OUT SYS_REFCURSOR, ACrs2 IN OUT SYS_REFCURSOR) AS
BEGIN
  OPEN ACrs1 FOR SELECT * FROM "Orders";
  OPEN ACrs2 FOR SELECT * FROM "Order Details";
END;

　　用FDStoredProc调用：

FDStoredProc1.FetchOptions.AutoClose := False;
FDStoredProc1.StoredProcName := 'TESTREFCRS';
FDStoredProc1.Open;
// work with "Orders" table data
FDStoredProc1.NextRecordSet;
// work with "Order Details" table data
FDStoredProc1.Close;

　　用FDQuery调用：

FDQuery1.FetchOptions.AutoClose := False;
FDQuery1.Open('BEGIN TestRefCrs(:p1, :p2); END;');
// work with "Orders" table data
FDQuery1.NextRecordSet;
// work with "Order Details" table data
FDQuery1.Close;

　　

CREATE PROCEDURE TestDynCrs (ASQL IN VARCHAR2, ACrs OUT SYS_REFCURSOR) AS
BEGIN
  OPEN ACrs FOR ASQL;
END;

　　调用：

FDQuery1.FetchOptions.AutoClose := False;
FDQuery1.SQL.Text := 'BEGIN TestDynCrs(:p1, :p2); END;';

FDQuery1.Params[0].AsString := 'SELECT * FROM "Orders"';
FDQuery1.Open;
// work with "Orders" table data
FDQuery1.Close;

FDQuery1.Params[0].AsString := 'SELECT * FROM "Order Details"';
FDQuery1.Disconnect;
FDQuery1.Open;
// work with "Order Details" table data
FDQuery1.Close;

　　

Working with Oracle Nested Cursors

FireDAC supports CURSOR type columns in SELECT lists. There may be multiple CURSORs in the list. But a CURSOR nested into a CURSOR is not supported. FireDAC sets such columns to dtRowSetRef and creates a TDataSetField for them. To process their row sets, the application should use the TFDMemTable, and set its DataSetField property to a TDataSetField reference.

While the application navigates through the main dataset, the nested datasets will be automatically open and refreshed to provide the nested cursor records for a current record of the main dataset.

For examples, see the FireDAC\Samples\DBMS Specific\Oracle\NestedCursors demo.