MyBatis高级 注解开发

package com.itheima.mapper;

import com.itheima.bean.Student;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import java.util.List;

public interface StudentMapper {
    //查询全部
    @Select("select * from Student")
    public abstract List<Student> selectAll();
    //新增操作
    @Insert("insert into Student values(#{id},#{name},#{age})")
    public abstract Integer insert(Student stu);
    //修改操作
    @Update("update Student set name=#{name},age=#{age} where id=#{id}")
    public abstract Integer update(Student stu);
    //删除操作
    @Delete("delete from Student where id=#{id}")
    public abstract Integer delete(Integer id);
}

package com.itheima.test;

import com.itheima.bean.Student;
import com.itheima.mapper.StudentMapper;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class Test01 {
       @Test
    public void selectAll() throws Exception {
        //1.加在核心配置文件
        InputStream is = Resources.getResourceAsStream("MyBatisConfig.xml");

        //2.获取SqlSession工厂对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //3.通过工厂对象获取SqlSession对象
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //4.获取StudentMapper接口的实现类对象
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //5.调用实现类对象中的方法，接受结果
        List<Student> list = mapper.selectAll();

        //6.处理结果
        for (Student student : list) {
            System.out.println(student);
        }

        //7.释放资源
        sqlSession.close();
        is.close();
    }
    @Test
    public void insert() throws Exception {
        //1.加在核心配置文件
        InputStream is = Resources.getResourceAsStream("MyBatisConfig.xml");

        //2.获取SqlSession工厂对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //3.通过工厂对象获取SqlSession对象
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //4.获取StudentMapper接口的实现类对象
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //5.调用实现类对象中的方法，接受结果
        Student stu=new Student(9,"王10",30);
        Integer insert = mapper.insert(stu);

        //6.处理结果
        System.out.println(insert);

        //7.释放资源
        sqlSession.close();
        is.close();
    }
    @Test
    public void update() throws Exception {
        //1.加在核心配置文件
        InputStream is = Resources.getResourceAsStream("MyBatisConfig.xml");

        //2.获取SqlSession工厂对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //3.通过工厂对象获取SqlSession对象
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //4.获取StudentMapper接口的实现类对象
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //5.调用实现类对象中的方法，接受结果
        Student stu=new Student(9,"王11",40);
        Integer update = mapper.update(stu);

        //6.处理结果
        System.out.println(update);

        //7.释放资源
        sqlSession.close();
        is.close();
    }
    @Test
    public void delete() throws Exception {
        //1.加在核心配置文件
        InputStream is = Resources.getResourceAsStream("MyBatisConfig.xml");

        //2.获取SqlSession工厂对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //3.通过工厂对象获取SqlSession对象
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //4.获取StudentMapper接口的实现类对象
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //5.调用实现类对象中的方法，接受结果
        Integer delete = mapper.delete(9);

        //6.处理结果
        System.out.println(delete);

        //7.释放资源
        sqlSession.close();
        is.close();
    }
}

<?xml version="1.0" encoding="UTF-8" ?>
<!--MyBatis的DTD约束-->
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">

<!--configuration 核心根标签-->
<configuration>

    <!--引入数据库连接的配置文件-->
    <properties resource="jdbc.properties"/>

    <!--配置LOG4J-->
    <settings>
        <setting name="logImpl" value="log4j"/>
    </settings>

    <!--起别名-->
    <typeAliases>
        <package name="com.itheima.bean"/>
    </typeAliases>

    <!--environments配置数据库环境，环境可以有多个。default属性指定使用的是哪个-->
    <environments default="mysql">
        <!--environment配置数据库环境  id属性唯一标识-->
        <environment id="mysql">
            <!-- transactionManager事务管理。  type属性，采用JDBC默认的事务-->
            <transactionManager type="JDBC"></transactionManager>
            <!-- dataSource数据源信息   type属性 连接池-->
            <dataSource type="POOLED">
                <!-- property获取数据库连接的配置信息 -->
                <property name="driver" value="${driver}" />
                <property name="url" value="${url}" />
                <property name="username" value="${username}" />
                <property name="password" value="${password}" />
            </dataSource>
        </environment>
    </environments>
    <!--配置映射关系-->
    <mappers>
        <package name="com.itheima.mapper"/>
    </mappers>

</configuration>

# Global logging configuration
# ERROR WARN INFO DEBUG
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://192.168.23.129:3306/db3
username=root
password=root