MySQL动态修改varchar长度_MySQL
Jun 01, 2016 pm 01:26 PMbitsCN.com
虽然这种情况不应该发生,通常像我们关系型数据库,我们应该是事先设计好,以后不能改动,但是由于之前工作的疏忽,其实说实话,也不仅仅是我个人的疏忽,主要是沟通上的原因,当然数据库毕竟是我设计的,所以,还是自我批评一下。
说一下情况:MySQL字段有个varchar值字段设置的太短了,设置了30个,(我依稀记得varchar是可扩展的,当然现实并不容忍我的依稀),所以我只能找一个方法在保证数据库数据不变的情况下,动态修改varchar字段的长度,找了一段时间,终于让我找到了。
alter table 表名 modify column 字段名 varchar(数量);
这个功能还是比较强大的,但是还是提醒大家最好设计的时候就不要出现这种问题啊。
bitsCN.com
Hot Article

Hot tools Tags

Hot Article

Hot Article Tags

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Convert VirtualBox fixed disk to dynamic disk and vice versa

How does Go language implement the addition, deletion, modification and query operations of the database?

Detailed tutorial on establishing a database connection using MySQLi in PHP

How does Hibernate implement polymorphic mapping?

iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos

Analysis of the basic principles of MySQL database management system

An in-depth analysis of how HTML reads the database

Tips and practices for handling Chinese garbled characters in databases with PHP
