unixodbc-使用Log4cxx日志输出至MySQL, 无法找到驱动错误
unixodbcmysqllog4cxx
Hi, guys!
用log4cxx日志框架对log内容输出至数据库（MySQL）一直未成功，不知道是什么步骤出现了问题。希望大伙们能帮帮忙，或者有什么更好的日志系统可以推荐，谢谢各位了。 ^_^
运行环境: Ubuntu 12.04 32bit + Eclipse CDT
log4cxx : apache-log4cxx-0.10.0
log4cxx支持两种ODBC选项（iODBC/unixODBC），这里选择了unixODBC形式进行管理
通过添加选项 ./configure --with-ODBC=unixODBC，编译通过.
之后对unixODBC的驱动和数据源进行配置，可以通过终端 isql log4cxx 成功建立连接
但是代码中使用Log4cxx进行输出的时候一直报下面的错误
<code>log4cxx: Failed to connect to database. - [unixODBC][Driver Manager]Data source name not found, and no default driver specified</code>
怀疑一:
Ecplise中是否没有加环境变量；
查阅ODBC资料，在Eclipse中加入ODBCSYSINI，ODBCINSTINI，ODBCINI变量后，还是没有效果.
怀疑二:
log4cxx配置写的不对；这个有没有什么官方的写法，晕呐!
配置内容:
/etc/odbcinst.ini
<code>[MySQL]Description = MySQLDriver = /usr/lib/i386-linux-gnu/odbc/libmyodbc.soSetup = /usr/lib/i386-linux-gnu/odbc/libodbcmyS.soFileUsage = 1 </code>/etc/odbc.ini
<code>[log4cxx]Description = The Database for Logging SystemTrace = onTraceFile = stderrDriver = MySQLSERVER = localhostPORT = 3306DATABASE = logUSER = root PASSWORD = 56789</code>log4cxx.xml
<code><appender name="OdbcMysqlAppender" class="org.apache.log4j.odbc.ODBCAppender"> <param name="URL" value="Driver={MySQL};Server=localhost;Database=log;User=root;Password=56789;"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="INSERT INTO logs (message) VALUES ('%d - %c - %p - %m')"> </layout></appender><root> <priority value="all"></priority> <appender-ref ref="OdbcMysqlAppender"></appender-ref></root></code>进展: _Time: 20150702_
查看Log4cxx源码，采用数据库方式记录Log，使用的是ODBCAppender src/main/cpp/odbcappender.cpp 作者原先的代码采用的是 SQLxxxW() 进行DriverConnect和SQLExecDirect操作，根据ODBC的描述，有 W 修饰是采用Unicode编码方式。总之我一直陷在这，一直报找不到数据源。于是乎我将 SQLxxxW() 修改成 SQLxxx() 方式的调用，同时将原先SQLWCHAR 修改成对应 SQLCHAR，即采用非宽字节的操作方式，成功的找到数据源，并且可以进行调用。
不过这就导致了中文的问题了.
疑惑
在odbcinst.ini中配置的Driver确实是libmyodbc5w.so，即驱动使用Unicode方式的呀！ (*与之相对应的是libmyodbc5a.so*). 至今还不知道自己是哪里出错，作者不可能毫无依据的就采用 SQLxxxW() 形式进行ODBC连接的吧.
我在ODBCAppender.cpp中添加了
#define SQL_WCHART_CONVERT，否则make的时候过不去， 即
<code>#if !defined(LOG4CXX)#define LOG4CXX 1#endif#include <log4cxx>#if LOG4CXX_HAVE_ODBC#if defined(WIN32) || defined(_WIN32)#include <windows.h>#endif#define SQL_WCHART_CONVERT#include <sqlext.h>#endif</sqlext.h></windows.h></log4cxx></code>
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