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| ### Editing ### | |
| `Ctrl + Space` 基本代码完成(任意类的，方法的或者变量的名称) | |
| `Ctrl + Shift + Enter` 补全当前语句 | |
| `Ctrl + P` Parameter info (within method call arguments) | |
| `Ctrl + Q` 快速查找文档 | |
| `Ctrl + 鼠标滑过` 简明信息查看 | |
| `Ctrl + F1` 在插入符号处显示错误或者警告信息 | |
| `Alt + Insert` 生成代码...(Getters,Setters,Constructors) | |
| `Ctrl + O` 重写方法 | |
| `Ctrl + I` 实现方法 |
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| # | |
| # /etc/sysctl.conf - Configuration file for setting system variables | |
| # See /etc/sysctl.d/ for additonal system variables | |
| # See sysctl.conf (5) for information. | |
| # | |
| #kernel.domainname = example.com | |
| # Uncomment the following to stop low-level messages on console | |
| #kernel.printk = 3 4 1 3 |
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| TRANSACTION（事务隔离级别） | |
| 1. ISOLATION_DEFAULT：这是一个PlatfromTransactionManager默认的隔离级别，使用数据库默认的事务隔离级别。 | |
| 每种数据库的默认隔离级别是不同的，例如SQL Server、Oracle默认Read Commited，MySQL默认Repeatable Read。 | |
| 另外四个与JDBC的隔离级别相对应，不同的隔离级别采用不同的锁类型来实现，在四种隔离级别中，Serializable的 | |
| 隔离级别最高，Read Uncommited的隔离级别最低。 | |
| 2. ISOLATION_READ_UNCOMMITTED：读未提交数据，这是事务最低的隔离级别，在并发的事务中，它充许一个事务可以 | |
| 读到另一个事务未提交的更新数据。（会出现脏读，不可重复读和幻读） | |
| 3. ISOLATION_READ_COMMITTED：读已提交数据，保证在并发的事务中，一个事务修改的数据提交后才能被另外一个事 |