CREATE TABLE `create_id` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '生成自增user_id', `v` varchar(1) NOT NULL COMMENT '用于生成新的id', PRIMARY KEY (`id`), UNIQUE KEY `v` (`v`)) ENGINE=MyISAM DEFAULT CHARSET=utf8 ;replace into `create_id` set `v`='1' ;
执行这条sql之后,用mysql_insert_id无法获得insert id。有什么方法/函数能获得replace into产生的新id?
回复讨论(解决方案)
replace 指令可能产生,也可能不产生新的 id
所以获取不到是正常的
那么 有什么方法/函数能获得replace into产生的新id?
答案是没有,但你可以指定 id
replace 指令可能产生,也可能不产生新的 id
所以获取不到是正常的
那么 有什么方法/函数能获得replace into产生的新id?
答案是没有,但你可以指定 id
按照我的表结构,且每次均执行同一个sql,也有可能不产生新的id?
v是唯一的,我每次都reaplace into同一个值,id应该会每次都自增1才对呀?
被你忽悠了!
刚才测试了一下,是能取到的
而且我看到php手册里有这么一段提示:
Warning
mysql_insert_id() 将 MySQL 内部的 C API 函数 mysql_insert_id() 的返回值转换成 long(PHP 中命名为 int)。如果 AUTO_INCREMENT 的列的类型是 BIGINT,则 mysql_insert_id() 返回的值将不正确。可以在 SQL 查询中用 MySQL 内部的 SQL 函数 LAST_INSERT_ID() 来替代。
replace into `create_id` set `v`='1';select LAST_INSERT_ID() as `id` from `create_id`;
这样确实能返回最新的id呀。
select LAST_INSERT_ID() as `id` from `create_id`;
?
select id from `create_id` order by id desc limit 1
不是一???
被你忽悠了!
刚才测试了一下,是能取到的
呃。。。我看php手册里面有一个老外这么写到:
athies at gmail dot com 21-Jul-2005 11:36
Just a quick note. mysql_insert_id() does work with REPLACE.
select LAST_INSERT_ID() as `id` from `create_id`;
?
select id from `create_id` order by id desc limit 1
不是一???
并发的情况下, order by id desc 可能就是别人的id了
LAST_INSERT_ID() 是在某个数据库连接的范围内吗?
原来这样也可以获id,学习了
select id from tb order by id desc limit 1
select id from tb order by id desc limit 1
这个只可以获取库里面的id吧?楼主是在插入数据的时候,要获取当前id。我用TP写的:
$Form=M('member');
$sql="show table status where Name='fht_member'";
$rs=$Form->query($sql);
$Mid=$rs[0]['Auto_increment'];
返回记录集有个['Auto_increment'],就是当前插入的自增id
后来发现mysql_insert_id()真能取到,感谢各位的踊跃发言

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Atom editor mac version download
The most popular open source editor