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o2o

  • 1 实体类 不能用基本类型 当为null时 会自动赋值0 有的数据不适合值为0 解决方法用引用类型
  • 2
   <plugin>
              <artifactId>maven-compiler-plugin</artifactId>
              <version>3.8.0</version>
              <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <encoding>UTF-8</encoding>
              </configuration>
            </plugin>
  • 3 RuntimeException 可以让事务回滚 终止事务 普通的 exception不能
  • 4 基本类型的传值 不改变其本身 引用类型改变其本身

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