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一个OCI程序小例子

2013-11-28 10:00 447 查看

#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_dfn1 = (OCIDefine *) 0;
static OCIDefine *p_dfn2 = (OCIDefine *) 0;
static OCIDefine *p_dfn3 = (OCIDefine *) 0;
static OCIBind *p_bnd = (OCIBind *) 0;

int main()
{
int p_bvi;
int rc;
char errbuf[100];
int errcode;
char mysql[100];
int id=0;
char name[20]={0};
char date[20]={0};

/* 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, "syt", 3, "syt", 3, "171", 3);
//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!\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 id,name,to_char(dtime, 'yyyy-mm-dd hh24:MI:SS') as dtime from teacher");
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 = 2; /* 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);
ub2 dbtype;
/* Define the select list items */
dbtype= SQLT_INT;
rc = OCIDefineByPos(p_sql, &p_dfn1, p_err, 1, (dvoid *) &id,
(sword)sizeof(int), dbtype, (dvoid *) 0, (ub2 *)0,
(ub2 *)0, OCI_DEFAULT);
dbtype= SQLT_STR;
rc = OCIDefineByPos(p_sql, &p_dfn2, p_err, 2, (dvoid *) &name,
(sword)sizeof(name), dbtype, (dvoid *) 0, (ub2 *)0,
(ub2 *)0, OCI_DEFAULT);
dbtype= SQLT_STR;
rc = OCIDefineByPos(p_sql, &p_dfn3, p_err, 3, (dvoid *) &date,
(sword)sizeof(date), dbtype, (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("%d, %s, %s\n", id, name, date);

id= 0;
memset(name, '\0', sizeof(name));
memset(date, '\0', sizeof(date));
rc= OCIStmtFetch(p_sql, p_err, 1, OCI_FETCH_NEXT, OCI_DEFAULT);
//rc=OCIStmtFetch2(p_sql, p_err, 1, OCI_FETCH_NEXT, 1, OCI_DEFAULT);
}

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 0;
}

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