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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <oci.h>

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;
}