講解查看MySQL數據庫錯誤碼的三個方法

查看MySQL數據庫錯誤碼（error code）的三個方法：

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

◆2. 查看頁面：http://dev.MySQL.com/doc/refman/5.0/en/error-handling.Html

◆3. MySQL的bin目錄下提供了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)