3.8、deleteById 通过id删除

```java package com.wzy;

import com.baomidou.mybatisplus.mapper.EntityWrapper; import com.wzy.pojo.Employees; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.Iterator; import java.util.List;

public class testActiveRecord { ApplicationContext applicationContext = new ClassPathXmlApplicationContext(“applicationContext.xml”);

@Test
public void testDeleteById(){
    Employees employees = new Employees();
    boolean b = employees.deleteById(9);
    System.out.println(b);
}

} ```