oracle 11.2.0 oci
Oracle 11.2.0 OCI是Oracle Database 11g Release 2的C语言编程接口。OCI使得开发人员可以通过使用C语言中的函数和数据结构与Oracle数据库进行通信。OCI还具有高度可扩展性和灵活性，可以支持从小型单用户应用程序到大型企业级应用程序的各种类型和规模的应用程序。
以一个简单的例子来说明OCI的应用场景。假设你的公司有一个人力资源管理系统，需要在数据库中保存员工的基本信息和工资数据。使用OCI，你可以编写代码来连接到数据库、执行访问和操作数据库的逻辑。下面我们来看看如何使用OCI来连接Oracle数据库。
#include
#include
#include
int main() {
OCIEnv* envhp;
OCIError* errhp;
sword status;
OCIServer* srvhp;
OCISession* authp;
OCISvcCtx* svchp;
// Initialize the environment
status = OCIEnvCreate(&envhp, OCI_DEFAULT, (dvoid*)0, (dvoid*(*)(dvoid*,size_t))0, (dvoid*(*)(dvoid*,dvoid*,size_t))0, (void(*)(dvoid*,dvoid*))0, 0, (dvoid**)0);
if(status != OCI_SUCCESS) {
printf("Failed to initialize OCI environment.\n");
exit(EXIT_FAILURE);
}
// Initialize the error handle
(void) OCIHandleAlloc((dvoid *) envhp, (dvoid **) &errhp, OCI_HTYPE_ERROR, (size_t) 0, (dvoid **) 0);
// Create server handle and connect to the database
(void) OCIHandleAlloc((dvoid *) envhp, (dvoid **)&srvhp, OCI_HTYPE_SERVER, 0, (dvoid **) 0);
(void) OCIHandleAlloc((dvoid *) envhp, (dvoid **)&svchp, OCI_HTYPE_SVCCTX, 0, (dvoid **) 0);
(void) OCIServerAttach(srvhp, errhp, (text *)"dbname", strlen("dbname"), OCI_DEFAULT);
(void) OCIAttrSet((dvoid *) svchp, OCI_HTYPE_SVCCTX, (dvoid *) srvhp, (ub4) 0, OCI_ATTR_SERVER, errhp);
(void) OCILogon(envhp, errhp, &svchp, (text *)"username", strlen("username"), (text *)"password", strlen("password"), (text *)"dbname", strlen("dbname"));
// Perform database operations
// ...
// Disconnect from the database
(void) OCILogoff(envhp, errhp);
// Free resources
(void) OCIHandleFree((dvoid *)authp, OCI_HTYPE_SESSION);
(void) OCIHandleFree((dvoid *)svchp, OCI_HTYPE_SVCCTX);
(void) OCIHandleFree((dvoid *)srvhp, OCI_HTYPE_SERVER);
(void) OCIHandleFree((dvoid *)errhp, OCI_HTYPE_ERROR);
(void) OCIHandleFree((dvoid *)envhp, OCI_HTYPE_ENV);
return 0;
}
