Home Database Mysql Tutorial MySQL乱码问题深层分析

MySQL乱码问题深层分析

Jun 07, 2016 pm 04:54 PM
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公司新购了一批PC,准备把几个性能较优的PC升级为数据库服务器,替换老旧的机器。公司有套POS终端软件,后台数据存储是 MySQ

一、概述

  公司新购了一批PC,准备把几个性能较优的PC升级为数据库服务器,替换老旧的机器。公司有套POS终端软件,后台数据存储是 MySQL 3.23 版。我准备硬件升级的同时升级数据库软件。但是升级过程中遇到闻名的 MySQL 的乱码问题。经过查找资料,加上自己的摸索和经验,终于完美地解决这个问题。

  MySQL 的乱码问题(不仅仅包括中文乱码,也包括其它语言的乱码,以下称之为乱码问题)只存在于4.1及其以上版本。4.1之前的 MySQL 不支持多语言,所以它会将你给它的数据“原封不动”地保存,再“原封不动”地读出来。从字节的角度来看,数据在这一过程中不会产生任何变化,,因此不会有乱码。

  4.1及以后的版本开始支持多语言,这个所谓的多语言,就是在输入输出时 MySQL 会替你做编码转换。而这个转换规则就是由客户端编码和服务器端编码来决定的。

  编码转换的规则就是,在输入数据时将编码由“客户端编码”转换为“服务器端编码”,输出时将数据由“服务器端编码”转换为“客户端编码”。 

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