OCI 连接池测试

#include "stdafx.h"
#include "ocilib.h"
#include
#include
#include
#include
#include
#include
#include
using namespace std;

#pragma comment(lib,"ociliba.lib")
#pragma comment(lib,"ocilibm.lib")
#pragma comment(lib,"ocilibw.lib")

#define MAX_THREADS 10
#define MAX_CONN    10
#define SIZE_STR   260

void worker(OCI_Thread *thread, void *data)
{
 OCI_Connection *cn = (OCI_Connection *)OCI_PoolGetConnection((OCI_ConnPool*)data, NULL);
 char str[SIZE_STR+1];
 std::cout<<"#######"<  /* application work here */

 str[0] = 0;

 OCI_Immediate(cn, "select to_char(sysdate, 'YYYYMMDD HH24:MI:SS') from dual", OCI_ARG_TEXT, str);

 printf("%s\n", str);

 /* ... */

 OCI_ConnectionFree(cn);
}

int main(void)
{
 OCI_Thread *th[MAX_THREADS];
 OCI_ConnPool *pool;
 if (!OCI_Initialize(NULL, NULL, OCI_ENV_DEFAULT | OCI_ENV_THREADED))
  return EXIT_FAILURE;

 /* create pool */
 pool = OCI_PoolCreate("T1", "chf", "chf", OCI_POOL_CONNECTION, OCI_SESSION_DEFAULT, 0, MAX_CONN, 1);

 /* create threads */
 for (int i = 0; i < MAX_THREADS; i++)
 {
  OCI_Connection *cn = (OCI_Connection *)OCI_PoolGetConnection((OCI_ConnPool*)pool, NULL);
  if(cn)
  {
   std::cout<<" the current busy cnt : "<     OCI_PoolGetMax(pool)<<"---"<     <     <     <

   OCI_ConnectionFree(cn);
  }
 }

 std::cout<<"-------------------------------------"<  OCI_PoolFree(pool);
 OCI_Cleanup();
 getchar();

 return EXIT_SUCCESS;
}

 

小结如下：

1.oci连接池，总是反复利用已经创建的连接，除非连接不够用才会创建新连接

2.OCI连接池支持ORACLE RAC模式，并且连接的时候，会从rac的配置文件中，依次读取配置ip等信息，进行连接测试，直到找到可用的IP/域名等信息为止