c oracle分页

5 6 OCIEnv envhp; 7 OCIError errhp; 8 OCISvcCtx svchp; 9 OCIStmt stmthp; 10 OCIDefine defhp; 11 12 char username = "scott"; 13 char password = "tiger"; 14 char dbname = "orcl"; 15 16 void error_report(OCIError errhp) { 17 text bufp; 18 sb4 errcode; 19 OCIErrorGet((dvoid )errhp, 1, NULL, &errcode, bufp, (ub4)sizeof(bufp), (ub4)OCI_HTYPE_ERROR); 20 printf("Error code = %d, Error message = %s\n", errcode, bufp); 21 } 22 23 int main() { 24 int result_count = 10; 25 int page_count = 1; 26 int total_count; 27 int i = 0; 28 char query_string[1024]; 29 text sqlstmt; 30 int sqlstmt_size; 31 int status; 32 33 OCIInitialize((ub4) OCI_DEFAULT, (dvoid )0, (dvoid ()(dvoid , size_t))0, 34 (dvoid ()(dvoid , dvoid , size_t))0, (void ()(dvoid , dvoid ))0); 35 OCIEnvInit(&envhp, OCI_DEFAULT, 0, 0); 36 OCIHandleAlloc((dvoid )envhp, (dvoid )&errhp, OCI_HTYPE_ERROR, 0, 0); 37 OCIHandleAlloc((dvoid *)envhp, (dvoid *)&svchp, OCI_HTYPE_SVCCTX, 0, 0); 38 OCIHandleAlloc((dvoid )envhp, (dvoid )&stmthp, OCI_HTYPE_STMT, 0, 0); 39 40 if (OCILogon(envhp, errhp, &svchp, (OraText )username, (ub4)strlen(username), (OraText )password, (ub4)strlen(password), (OraText )dbname, (ub4)strlen(dbname)) != OCI_SUCCESS) { 41 error_report(errhp); 42 return 1; 43 } 44 45 sprintf(query_string, "SELECT COUNT() FROM person"); 46 OCIStmtPrepare(stmthp, errhp, (OraText )query_string, (ub4)strlen(query_string), (ub4)OCI_NTV_SYNTAX, (ub4)OCI_DEFAULT); 47 status = OCIStmtExecute(svchp, stmthp, errhp, (ub4)1, (ub4)0, (CONST OCISnapshot)NULL, (OCISnapshot)NULL, (ub4)OCI_DEFAULT); 48 49 if (status != OCI_SUCCESS) { 50 error_report(errhp); 51 return 1; 52 } 53 54 OCIHandleAlloc((dvoid )envhp, (dvoid *)&defhp, OCI_HTYPE_DEFINE, 0, 0); 55 OCIStmtBindByName(stmthp, &defhp, errhp, (OraText )"COUNT()", -1, (dvoid ) &total_count, sizeof(total_count), SQLT_INT, (dvoid )0, (ub2 )0, (ub2 )0, 0, (ub4)OCI_DEFAULT); 56 OCIStmtFetch(stmthp, errhp, 1, OCI_FETCH_NEXT, OCI_DEFAULT); 57 58 if (result_counttotal_count) { 62 result_count = total_count; 63 } 64 65 page_count = (total_count + result_count - 1) / result_count; 66 67 sprintf(query_string, "SELECT FROM person WHERE rownum >= %d AND rownum

以上代码中，我们首先使用OCI函数OCILogon连接Oracle数据库。然后使用OCI函数OCIStmtPrepare准备需要执行的SQL语句。接下来，我们可以使用OCI函数OCIStmtExecute执行SQL语句并返回结果集。这里需要注意的是，对于分页操作，我们需要使用rownum来筛选结果集，并且需要计算出总页数。

可以看到，C Oracle分页的实现并不复杂，只需要使用几个简单的API函数即可。当然，在实际的应用中，根据具体情况需要做出相应的修改。

总之，C Oracle分页是一个非常实用的技术，可以让我们更加方便地处理数据库中的大型数据集合。希望本文能够对您有所帮助！