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Homephp教程php手册php 获取数据库最大的id几种方法

今天在个数据库类时一直都没法获取最后保存数据的ID了,经过反复排查还是没找到原因,不过后来总结了一些查找出mysql指定表中最后一条记录的ID或直接是说最新插入记录的ID,下面一起来看看。

开发什么的最喜欢了。写程序可以提高实力又可以收藏一些代码!的确很是不错。由于某些原因需要获取数据库最大的id值。所以出现了这段php 获取数据库最大的id代码了。这里面的max(id) 这里面的id 就是要获取最大的id了。如果是别的字段请填写为其他字段

方法一

$fh = mysql_query("select  MAX(id) from log");
$c_echo = mysql_fetch_array($fh);
echo $c_echo;

 

方法二

<?php
//执行插入数据库的语句
$getID=mysql_insert_id();//$getID即为最后一条记录的ID
?>

PHP 函数 mysql_insert_id() 是返回在最后一次执行了 INSERT 查询后,由 AUTO_INCREMENT 定义的字段的值。

方法三

msyql_query("select last_insert_id()");

last_insert_id() 是mysql 一个函数 也是 对当前链接起效

此用法 解决了 mysql_insert_id () 中遇到的 bigint 型问题


教程地址:

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