MYSQLÖÐͳ¼Æ²éѯ½á¹û×ÜÐÐÊýµÄ±ã½Ý·½·¨¡¾×ªÔØ¡¿
ת×Ô£ºhttp://ginew.blog.163.com/
½ñÌìÔĶÁ wordpress´úÂëʱ£¬·¢ÏÖÒ»¸öMYSQLµÄ¹Ø¼ü´Ê SQL_CALC_FOUND_ROWS ²é¿´ÊÖ²áºó·¢Ïִ˹ؼü´ÊµÄ×÷ÓÃÊÇÔÚ²éѯʱͳ¼ÆÂú×ã¹ýÂËÌõ¼þºóµÄ½á¹ûµÄ×ÜÊý£¨²»ÊÜ Limit µÄÏÞÖÆ£©
ÀýÈ磺 SELECT SQL_CALC_FOUND_ROWS tid from cdb_threads WHERE fid=14 LIMIT 1,10;
¼ÙÉèÂú×ãÌõ¼þµÄÓÐ1000Ìõ£¬ÕâÀï·µ»Ø10Ìõ¡£Á¢¼´Ê¹Óà SELECT found_rows() AS rowcount; Ôò·µ»ØµÄ rowcount Ϊ1000£»
ÕâÑù½ÚÊ¡ÁËSELECT count(*) AS rowcountµÄÖØ¸´²éѯ£¬¿ÉÒÔ½ÚÊ¡±È½Ï¿É¹ÛµÄʱ¼ä
===============================
ÒÔÏÂÊǸ÷ÅÔÚÔÚÓÎζÖеÄÓ¦Óãº
function mail_list_sent($uid, $start)
{
// ×¢ÒâSQL_CALC_FOUND_ROWS uidÖ®¼äûÓжººÅ
$query = "SELECT SQL_CALC_FOUND_ROWS uid, real_name, current_city, msg_uid, sender_flag, msg_title, msg_content from ".TT_DBTABLEPRE."mailbox as mb1, ".TT_DBTABLEPRE."user as usr1 WHERE mb1.sender_id=usr1.uid AND mb1.sender_id=$uid AND sender_flag > 0 LIMIT $start, ".TT_PAGESIZE;
$mails = $this->db->fetch_all($query);
//²éѯSELECTÖÐÂú×ãÌõ¼þµÄÐÐÊý£¬ÓëLIMIT×Ó¾äÎÞ¹Ø
$max_count = $this->db->fetch_first("SELECT found_rows() AS rowcount");
$tmp['state_code'] = 200;
$tmp['info'] = "OK";
$tmp['list'] = $mails;
$data = json_encode($tmp);
return $data;
}
¸Ðл×÷Õß·ÖÏí£¡
Ïà¹ØÎĵµ£º
ÔÚ´¦ÀíÒ»¸ö´óÊý¾ÝÁ¿Êý¾Ý¿âµÄʱºò
ͻȻ·¢ÏÖmysql¶ÔÓÚcount(*)µÄ²»Í¬´¦Àí»áÔì³É²»Í¬µÄ½á¹û
±ÈÈçÖ´ÐÐ
SELECT count(*) from tablename
¼´Ê¹¶ÔÓÚǧÍò¼¶±ðµÄÊý¾ÝmysqlÒ²Äܷdz£Ñ¸Ëٵķµ»Ø½á¹û
¶ø¶ÔÓÚ
SELECT count(*) from tablename WHERE…..
mysqlµÄ²éѯʱ¼ä¿ªÊ¼ÅÊÉý
×Ðϸ²éÔÄÀÛÏÂÊÖ²á,·¢ÏÖµ±Ã»ÓÐWHEREÓï¾ä¶ÔÓÚÕ ......
1¡¢Ñ¡È¡×îÊÊÓõÄ×Ö¶ÎÊôÐÔ
MySQL ¿ÉÒԺܺõÄÖ§³Ö´óÊý¾ÝÁ¿µÄ´æÈ¡£¬µ«ÊÇÒ»°ã˵À´£¬Êý¾Ý¿âÖеıíԽС£¬ÔÚËüÉÏÃæÖ´ÐеIJéѯҲ¾Í»áÔ½¿ì¡£Òò´Ë£¬ÔÚ´´½¨±íµÄʱºò£¬ÎªÁË»ñµÃ¸üºÃµÄÐÔÄÜ£¬ÎÒÃÇ¿ÉÒÔ½«±íÖÐ×ֶεĿí¶ÈÉèµÃ¾¡¿ÉÄÜС¡£ÀýÈ磬ÔÚ¶¨ÒåÓÊÕþ±àÂëÕâ¸ö×Ö¶Îʱ£¬Èç¹û½«ÆäÉèÖÃΪCHAR(255),ÏÔÈ»¸øÊý¾Ý¿âÔö¼ÓÁ˲»±ØÒªµÄ¿Õ¼ä£¬ÉõÖÁʹÓÃV ......
¿´µ½²»ÉÙÓû§·´Ó³×ª»»ÍêÒÔºóÊÇÂÒÂëµÄÇé¿ö,³öÏÖÕâÖÖÏÖÏóµÄÖ÷ÒªÔÒòÊÇÕâÀàÓû§Ê¹ÓõͼÊÇmysql4.1ÒÔÉϵİ汾.ÏÂÃæ×÷Ò»¸ö˵Ã÷,Ï£Íû³öÏÖÕâ¸öÎÊÌâµÄÅóÓѶ¼ÄÜÄÍÐĵİÑÕâ¸öÎĵµ¿´Íê!!!
MySQL 4.1¿ªÊ¼£¬¶Ô¶àÓïÑÔµÄÖ§³ÖÓÐÁ˺ܴó±ä»¯ (Õâµ¼ÖÂÁËÎÊÌâµÄ³öÏÖ)¡£¾¡¹Ü´ó²¿·ÖµÄµØ·½ (°üÀ¨¸öÈËʹÓúÍÖ÷»úÌṩÉÌ)£¬MySQL 3¡¢4.0 ÈÔȻռÖ÷µ¼µØ ......
ÓÉÓÚǰ¶Îʱ¼äÒªÓÃpowerdesignerÉè¼ÆÊý¾Ý¿â£¬¿ÉÊý¾Ý¿âÉè¼ÆºÃºóºÃµ¼ÈëMysQLʱÐèÒªODBCÁ¬½Ó£¬¶øMysQL5.0ÒÔÉϵľùÒªÐÞ¸ÄÃÜÂ루ÎÒÔÚÍøÉϲé¹ý£©£¬°´ËûÃǵÄÒâ˼ÐÞ¸ÄÁËrootÃÜÂ룬½á¹ûÊÇÖ±½Ó½ø²»ÁËMysQLÁË£¬ÎÒÄǸöÓôÃÆ£¬ÔÚÍøÉϲéÕÒ×ÊÁÏ£¬Ò²°´ËûÃǵķ½·¨×öÁË£¬¿É»¹ÊDz»ÐУ¨±¾È˶Ôdos²»Ê죩¡£µ«×îÖÕ»¹ÊÇ¿ÉÒÔÁË£¬ÏÂÃæËµÏ¾ßÌå·½·¨
1¡¢w ......
ÔÚFC8ÖÐĬÈϰ²×°µÄÓÐmysql£¬Ã»Óеϰ¿ÉÒԺܷ½±ãµÄ°²×°Ï¡£
ĬÈϵÄmysqlµÄincludeÎļþĿ¼ÔÚ/usr/include/mysql
ĬÈϵÄmysqlµÄlibÎļþ¼ÐÔÚ/usr/lib/mysql
ÕâÁ½¸öĿ¼ÔÚÎÒÃDZàÒëʱºòÐèÒªµ½¡£
ÎҵIJâÊÔÓõÄC´úÂëΪ£º
££include <stdio.h>
#include <stdlib.h>
#include <mysql.h>
#define CONN_HOST ......