SQL Server 将某些系统事件和用户定义事件记录到 SQL Server 错误日志和 Microsoft Windows 应用程序日志中。 这两种日志都会自动给所有记录事件加上时间戳。 使用 SQL Server 错误日志中的信息可以解决SQL Server的相关问题。
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System.NullReferenceException:“未将对象引用设置到对象的实例。
Lost connection to MySQL server…
[ERROR] InnoDB: Expected to open 3 undo tablespaces but was able to find only 0 undo tablespaces. Set the innodb_undo_tablespaces parameter to the correct value and retry. Suggested value is 0
ERROR 1418 (HY000): This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)
Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column.
Error 1390 (HY000): Prepared statement contains too many placeholders
设计模式 -- 单例模式(Singleton Pattern)
设计模式的六大原则