讲解查看MySQL数据库错误码的三个方法

查看MySQL数据库错误码（error code）的三个方法：

◆1. MySQL Reference Manual有Appendix B. Error Codes and Messages

◆2. 查看页面：http://dev.mysql.com/doc/refman/5.0/en/error-handling.html

◆3. MySQL的bin目录下提供了perror.exe工具，使用方法如下：

# /usr/local/mysql/bin/perror 10
Error code 10: No child processes

# /usr/local/mysql/bin/perror 127
Error code 127: Network is down
127 = Record-file is crashed

# /usr/local/mysql/bin/perror 134
Error code 134: Transport endpoint is not connected
134 = Record was already deleted (or record file crashed)