安装redmine1.0版本时候，出现2个错误，处理方式如下：
1、会出现无法找到libmysql.dll错误
在Windows下，如果使用了mysql5.1，不但在安装mysql.gem时候会报ri和rdoc的错误，而且在执行rakedb:migrate时候也会报错：
这是由于mysql5.1里面所带的libmySQL.dll和rails不兼容（至少在2.3.5还是如此）。可以从网上下载一个旧版本的libmySQL.dll，将其放到ruby的bin目录即可。
下载地址：
http://instantrails.rubyforge.org/svn/trunk/InstantRails-win/InstantRails/mysql/bin/libmySQL.dll
2、安装时候，会出现Mysql::Error:BLOB/TEXTcolumn'description'can'thaveadefaultvalue:ALTERTABLE`projects`CHANGE`description``description`textDEFAULT''
这个问题可以如下解决：
Ithinkyourprobleminissuescontrollerisnotthesamequestionwithmymigrationerror.
toJPLang:
Ihaveresolvedmymigrationerrorbysomeirregularmethod.Pleasenote:
1.MySQL5.0and5.1willnotallowdefaultvalueforBLOB/TEXTcolumn.
2.IfMySQLisworkinginstrictmode,itwillreportanerroronaTEXTcolumn'sdefaultvalueandstop.Whileifitsworkmodeisnotstrictmode(maybesql_mode=""),itwilljustgiveoutawarninginsteadofanerrorandthesqlcommandwillbeexecutedsuccessfully.
3.MySQL5.0binaryinstalledonwindowswillworkinstrictmodeindefault.Whileitwillnotworkinstrictmodeonlinuxcompiledfromsource.(I'mnotsurewithlinuxbecauseIusewindowsxp)
4.Somaybemostoftheredmine'suserswouldn'tencounterthisproblem...
So,towindowsusersofredmine,ifyouhaveencounteredmyproblem,thereisasolution:
1.findyourmysqlserver'sinifile,willbe"MySQL\MySQLServer5.0\my.ini"indefault.，找到my.ini文件
2.locatethisline:sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
3.adda"#"tothehead:#sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
4.restartmysqlserver
5.runrakedb:migrate,itshouldsucceedthistime
6.changethemy.inifilebackandrestartmysqlserver