在使用MYSQL時，插入中文字符出現亂碼，中文全被用?代替。馬上google以下。原來是出現這種情況的原因是字符集不匹配造成的。
在MYSQL中，如果使用缺省的字符集，在建庫、建表時，默認使用的是latin1字符集，爲ISO 8859-1西歐字符集。插入中文字符時，與之不匹配，就會出現亂碼。
要解決此問題，就必須手動將數據庫Server和Client的字符編碼改爲gb2312。配置方法如下：
打開MYSQL安裝目錄下的my.ini文件，找到如下段落：
[client]
port=3306
[mysql]
default-character-set=latin1
將latin1改爲gb2312.
# SERVER SECTION
# ----------------------------------------------------------------------
#
# The following options will be read by the MySQL Server. Make sure that
# you have installed the server correctly (see above) so it reads this
# file.
#
[mysqld]
# The TCP/IP Port the MySQL Server will listen on
port=3306
#Path to installation directory. All paths are usually resolved relative to
this.
basedir="C:/Program Files/MySQL/MySQL Server 5.1/"
#Path to the database root
datadir="C:/Documents and Settings/All Users/Application Data/MySQL/MySQL
Server 5.1/Data/"
# The default character set that will be used when a new schema or table is
# created and no character set is defined
default-character-set=latin1
將其中的default-character-set=latin1改爲default-character-set=gb2312,然後重啓MYSQL(以前已經亂碼的數據庫要重建).