linux下用C编写的OCI连接Oracle数据库程序代码

在Oracle 建立数据库

create table employees(employee_id number(3), name varchar2(20), sex varchar2(5), birthday date);
alter session set nls_date_format = 'yyyy-mm-dd';
insert into employees values('101', '耳温枪 ', 'na', '1999-05-03');
insert into employees values('102', 'xiaoli ', 'na', '1999-02-03');
insert into employees values('103', 'xiaozhang ', '男 ', '1999-02-03');
insert into employees values('104', '五千万 ', '男 ', '1999-02-03');
insert into employees values('105', '问问 ', '女 ', '1999-02-03');
insert into employees values('106', '阿散酸 ', '女 ', '1999-02-03');
insert into employees values('107', '阿斯顿 ', '男 ', '1999-02-03');
insert into employees values('108', '撒旦 ', 'na', '2001-5-05');
insert into employees values ('001','张三 ','三 ','2001-07-05');
insert into employees values('111','张三 ','一 ','2003-02-08');

OCI代码：

/*gcc -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I${ORACLE_HOME}/rdbms/public -I${ORACLE_HOME}/rdbms/demo -L${ORACLE_HOME}/lib -lclntsh -o oracle_test oracle_test.c
*/
#include
#include
#include
#include

static OCIEnv           *p_env;
static OCIError         *p_err;
static OCISvcCtx        *p_svc;
static OCIStmt          *p_sql;
static OCIDefine        *p_dfn    = (OCIDefine *) 0;
static OCIBind          *p_bnd    = (OCIBind *) 0;

int main()
{
   int             p_bvi;
   char            *p_sli;
   char     *p_sli1;
   int             rc;
   char            errbuf[100];
   int             errcode;
   char            mysql[20];
 
   p_sli=(char *)malloc(20);
   memset(p_sli,0,20);
   p_sli1=(char *)malloc(20);
   memset(p_sli1,0,20);
 
   /* Initialize OCI evironment*/
   rc = OCIEnvCreate((OCIEnv **) &p_env,OCI_DEFAULT,(dvoid *)0,
          (dvoid * (*)(dvoid *, size_t)) 0,
          (dvoid * (*)(dvoid *, dvoid *, size_t))0,
          (void (*)(dvoid *, dvoid *)) 0,     
          (size_t) 0, (dvoid **) 0);
 
   /* Initialize handles */
   rc = OCIHandleAlloc( (dvoid *) p_env, (dvoid **) &p_err, OCI_HTYPE_ERROR,
           (size_t) 0, (dvoid **) 0);
   rc = OCIHandleAlloc( (dvoid *) p_env, (dvoid **) &p_svc, OCI_HTYPE_SVCCTX,
           (size_t) 0, (dvoid **) 0);

   /* Connect to database server */
   rc = OCILogon(p_env, p_err, &p_svc, "scott", 5, "tiger", 5, "orcl", 4);
   //rc = OCILogon(p_env, p_err, &p_svc, "hr/hr@orcl", 10, NULL, -1, NULL, -1);
   if (rc != 0) {
      OCIErrorGet((dvoid *)p_err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);
      printf("Error - %.*s/n", 512, errbuf);
      exit(8);
   }
   else
   {
    printf("Connect to orcl successful! 已连接！/n");
   }

   /* Allocate and prepare SQL statement */
   rc = OCIHandleAlloc((dvoid *) p_env, (dvoid **) &p_sql,
           OCI_HTYPE_STMT, (size_t) 0, (dvoid **) 0);

   /* set my sql statement */
//   strcpy(mysql,"select name from employees where emploee_id=:x");
   strcpy(mysql, "select * from employees ");
//     strcpy(mysql, "insert into employees values('109', 'x12er', 'na', '1888-06-08')");
     //strcpy(mysql,"delete from employees where emploee_id='108'");
//   strcpy(mysql,"desc employees;");
   rc = OCIStmtPrepare(p_sql, p_err, mysql,
           (ub4) strlen(mysql), (ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT);

   /* Bind the values for the bind variables */
  // p_bvi = 101;  /* Use employee_id=102 */
  // rc = OCIBindByName(p_sql, &p_bnd, p_err, (text *) ":x",
  //        -1, (dvoid *) &p_bvi, sizeof(int), SQLT_INT, (dvoid *) 0,
  //         (ub2 *) 0, (ub2 *) 0, (ub4) 0, (ub4 *) 0, OCI_DEFAULT);

   /* Define the select list items */
   rc = OCIDefineByPos(p_sql, &p_dfn, p_err, 1, (dvoid *) p_sli,
           (sword) 20, SQLT_STR, (dvoid *) 0, (ub2 *)0,
           (ub2 *)0, OCI_DEFAULT);
   rc = OCIDefineByPos(p_sql, &p_dfn, p_err, 2, (dvoid *) p_sli1,
           (sword) 20, SQLT_STR, (dvoid *) 0, (ub2 *)0,
           (ub2 *)0, OCI_DEFAULT);

   /* Execute the SQL statment */
   rc = OCIStmtExecute(p_svc, p_sql, p_err, (ub4) 1, (ub4) 0,
           (CONST OCISnapshot *) NULL, (OCISnapshot *) NULL, OCI_DEFAULT);
 

  while (rc != OCI_NO_DATA) {             /* Fetch the remaining data */
      printf("%s   %s/n",p_sli,p_sli1);
      rc = OCIStmtFetch(p_sql, p_err, 1, 0, 0);
  }
  
/*   if(rc != OCI_SUCCESS && rc != OCI_SUCCESS_WITH_INFO){
 printf("insert error!/n");
 OCIErrorGet((dvoid *)p_err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);
 }
   else
 printf("insert success!/n");
*/
   rc = OCILogoff(p_svc, p_err);                           /* Disconnect */
   rc = OCIHandleFree((dvoid *) p_sql, OCI_HTYPE_STMT);    /* Free handles */
   rc = OCIHandleFree((dvoid *) p_svc, OCI_HTYPE_SVCCTX);
   rc = OCIHandleFree((dvoid *) p_err, OCI_HTYPE_ERROR);

   return;
}