occistre.cpp

来自「此源代码是通过occi连接oracle 9i的简单例子」· C++ 代码 · 共 81 行

/**
 * occistrm - Demonstrating the usage of streams for VARCHAR2 data 
 *
 * Description
 *   This demo program selects VARCHAR2 data using stream operations.
 */

#include <iostream>
#include <occi.h>
using namespace oracle::occi;
using namespace std;

class occistrm
{
  private:

  Environment *env;
  Connection *conn;

  public:

  occistrm (string user, string passwd, string db)
   throw (SQLException)
  {
    env = Environment::createEnvironment (Environment::DEFAULT);
    conn = env->createConnection (user, passwd, db);
  }// end of constructor occistrm (string, string, string)

  ~occistrm ()
   throw (SQLException)
  {
    env->terminateConnection (conn);
    Environment::terminateEnvironment (env);
  }// end of destructor

  /**
   * displaying all the rows in the table
   */
  void displayAllRows ()
  {
    Statement *stmt = conn->createStatement (
      "SELECT summary FROM book WHERE bookid = 11");
    stmt->execute ();
    ResultSet *rs = stmt->getResultSet ();
    rs->setCharacterStreamMode(1, 4000);
    char buffer[500];
    int length = 0; 
    unsigned int size = 500;

    while (rs->next ())
    {
      Stream *stream = rs->getStream (1);
      while( (length=stream->readBuffer(buffer, size))!=-1)
      {
        cout << "Read " << length << " bytes from stream" << endl;
      }
      rs->closeStream(stream);
    }
    stmt->closeResultSet (rs);
    conn->terminateStatement (stmt);
  }// end of updateRow (string);

}; // end of class occistrm


int main (void)
{
  string user = "SCOTT";
  string passwd = "TIGER";
  string db = "";

  cout << "occistrm - Exhibiting usage of streams for VARCHAR2 data" 
    << endl;
  occistrm *demo = new occistrm (user, passwd, db);

  demo->displayAllRows ();

  delete (demo);
  cout << "occistrm - done" << endl;
}// end of int main (void);