This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
### 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 |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# | |
# /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 |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
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 |