C++通过OCCI操作Oracle数据库详解

#include <iostream>
#define LINUXOCCI //避免函数重定义错误
#include <occi.h>
using namespace std;
using namespace oracle::occi;
#pragma comment(lib,"E:\\app\\Administrator\\product\\11.2.0\\dbhome_2\\OCI\\lib\\MSVC\\oci.lib")
#pragma comment(lib,"E:\\app\\Administrator\\product\\11.2.0\\dbhome_2\\OCI\\lib\\MSVC\\oraocci11.lib")

int mainBak()
{
   Environment *env=Environment::createEnvironment(Environment::DEFAULT);
   cout<<"success"<<endl;
   string name = "scott";
   string pass = "tiger";
   string srvName = "127.0.0.1:1521/orcl";
   try
   {
      Connection *conn = env->createConnection(name, pass);
      cout<<"conn success"<<endl;
      env->terminateConnection(conn);
   }
   catch(SQLException e)
   {
      cout<<e.what()<<endl;
       return -1;
   }
   Environment::terminateEnvironment(env);
   cout<<"end!"<<endl;
   return 0;
}

/*
success
conn success
end!
请按任意键继续. . .
*/

</pre><pre name="code" class="cpp">

</pre><p></p><p>Employees.h</p><p><pre name="code" class="cpp">//Employees.h

//复制代码
/*
* A simple OCCI test application
* This file contains the Employees class declaration
*/

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

class Employees {
public:
   Employees();
   virtual ~Employees();
 
   void List();

private:
   Environment *env;
   Connection  *con;

   string user;
   string passwd;
   string db;
 };

#include "Employees.h" 

Employees::Employees()
 {
   /*
 69    * connect to the test database as the HR
 70    * sample user and use the EZCONNECT method
 71    * of specifying the connect string. Be sure
 72    * to adjust for your environment! The format
 73    * of the string is host:port/service_name
 74 */
 
   user = "scott";
   passwd = "tiger";
  db = "127.0.0.1:1521/orcl";
 
   env = Environment::createEnvironment(Environment::DEFAULT);
 
   try
   {
     con = env->createConnection(user, passwd, db);
   }
   catch (SQLException& ex)
   {
     cout << ex.getMessage();
 
     exit(EXIT_FAILURE);
   }
}

 Employees::~Employees()
 {
   env->terminateConnection (con);

   Environment::terminateEnvironment (env);
 }
 
 void Employees::List()
{
  /*
104    * simple test method to select data from
105    * the employees table and display the results
106 */
 
   Statement *stmt = NULL;
   ResultSet *rs = NULL;
   string sql = "select EMPNO, ENAME, JOB " \
                "from EMP order by EMPNO";
 
   try
   {
     stmt = con->createStatement(sql);
   }
  catch (SQLException& ex)
  {
     cout << ex.getMessage();
   }
 
   if (stmt)
   {
     try
     {
      stmt->setPrefetchRowCount(32);

      rs = stmt->executeQuery();
    }
    catch (SQLException& ex)
     {
      cout << ex.getMessage();
    }
 
    if (rs)
    {
      cout << endl << setw(8) << left << "EMPNO"
            << setw(22) << left << "ENAME"
           << setw(27) << left << "JOB"
           << endl;
       cout << setw(8) << left << "======"
            << setw(22) << left << "===================="
            << setw(27) << left << "========================="
           << endl;
 
       while (rs->next()) {
        cout << setw(8) << left << rs->getInt(1)
            << setw(22) << left << (rs->isNull(2) ? "n/a" : rs->getString(2))
              << setw(27) << left << rs->getString(3)
			  << endl <<"-----------------------------------------"<<endl;
              //<< endl;
		//cout<<"-----------------------------------------"<<endl;
         }

       cout << endl;
       stmt->closeResultSet(rs);
     }
     con->terminateStatement(stmt);
   }
 }

#include "Employees.h"

 using namespace std;
 using namespace oracle::occi;

 int main (void)
 {
   /*
 48    * create an instance of the Employees class,
 49    * invoke the List member, delete the instance,
 50    * and prompt to continue...
 51 */
 
   Employees *pEmployees = new Employees();
 
   pEmployees->List();
   cout << "ENTER to continue...";
 
   cin.get();
   delete pEmployees;
 

 
   return 0;
 }