Question

我正在尝试开发一个双层程序，为此，我需要使用连接池通过OCCI接口将我的程序连接到数据库（在本例中为Oracle）。我已经在CodeBlocks中链接了occi.h头文件和目录，但是当我尝试编译时，它显示了这个错误：

|未定义引用`oracle :: occi :: Environment :: createEnvironment（oracle :: occi :: Environment :: Mode，void *，void *（）（void ，unsigned int），void *（）（void ，void *，unsigned int），void（）（void ，void *））'|

||未定义的引用`oracle :: occi :: Environment :: terminateEnvironment（oracle :: occi :: Environment *）'|

||错误：ld返回1退出状态|   || ===构建失败：3个错误，0个警告（0分钟，2秒（秒））=== |

有谁知道这个错误意味着什么？我不是王牌C ++程序员，所以请耐心等待我！

这是发生错误的演示代码：

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

class occipool {
  private:
   Environment* env;
   Connection* con;
  Statement* stmt;

 public:
 /**
 * Constructor for the occipool test case.
 */
  occipool() {
    env = Environment::createEnvironment(Environment::DEFAULT);
  }    // end of constructor occipool ()

 /**
* Destructor for the occipool test case.
*/
 ~occipool() {
  Environment::terminateEnvironment(env);
 }    // end of ~occipool ()

 /**
* The testing logic of the test case.
*/
 dvoid select() {
cout << "occipool - Selecting records using ConnectionPool interface"
     << endl;
const string poolUserName = "name";
const string poolPassword = "password";
const string connectString = "name";
const string username = "name";
const string passWord = "password";
unsigned int maxConn = 5;
unsigned int minConn = 3;
unsigned int incrConn = 2;
ConnectionPool* connPool = env->createConnectionPool(
    poolUserName, poolPassword, connectString, minConn, maxConn, incrConn);
try {
  if (connPool)
    cout << "SUCCESS - createConnectionPool" << endl;
  else
    cout << "FAILURE - createConnectionPool" << endl;
  con = connPool->createConnection(username, passWord);
  if (con)
    cout << "SUCCESS - createConnection" << endl;
  else
    cout << "FAILURE - createConnection" << endl;
} catch (SQLException ex) {
  cout << "Exception thrown for createConnectionPool" << endl;
  cout << "Error number: " << ex.getErrorCode() << endl;
  cout << ex.getMessage() << endl;
}

cout << "retrieving the data" << endl;
stmt = con->createStatement("SELECT ID, dept_name FROM p_worker");
ResultSet* rset = stmt->executeQuery();
while (rset->next()) {
  cout << "author_id:" << rset->getInt(1) << endl;
  cout << "author_name:" << rset->getString(2) << endl;
}
stmt->closeResultSet(rset);
con->terminateStatement(stmt);
connPool->terminateConnection(con);
env->terminateConnectionPool(connPool);

cout << "occipool - done" << endl;
}  // end of test (Connection *)

};  // end of class occipool

  int main(void) {
 string user = "name";
 string passwd = "password";
 string db = "name";

 occipool* demo = new occipool();

 demo->select();
 delete demo;

  }  // end of main ()

Answer 1

您是否使用libocci.so和-libclntsh.so库进行链接？

它的需要。

在代码块上用c ++编译Oracle数据库环境时出错

1 个答案: