1.27、deleteById 根据id删除数据

package com.wzy.text;
import com.baomidou.mybatisplus.plugins.Page;
import com.wzy.mapper.EmployeeMapper;
import com.wzy.pojo.Employee;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.sql.SQLException;
public class TestS {
    ApplicationContext applicationContext =
            new ClassPathXmlApplicationContext("applicationContext.xml");
    EmployeeMapper employeeMapper =
            applicationContext.getBean("employeeMapper",EmployeeMapper.class);
    @Test
    public void test11() throws SQLException {
        //根据id删除数据
        Integer result = employeeMapper.deleteById(21);
        System.out.println(result);
    }
}