3.进行一些操作，执行sql语句
Employees.h
/* * 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; }; 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 = "127.0.0.1:1522/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; } cout << endl; stmt->closeResultSet(rs); } con->terminateStatement(stmt); } } |
main.cc
#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(); delete pEmployees; cout << "ENTER to continue..."; cin.get(); return 0; } |
