Mybatis

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.song.repository.AccountRepository">
    <insert id="save" parameterType="com.song.entity.Account">
        insert into mybatis.t_account(id,username,password,age) values(#{id},#{username},#{password},#{age})
    </insert>
    <update id="update" parameterType="com.song.entity.Account">
        update mybatis.t_account set username = #{username},password=#{password},age=#{age} where id=#{id}
    </update>
    <delete id="delete" parameterType="long">
        delete from mybatis.t_account where id=#{id};
    </delete>
    <select id="findAll" resultType="com.song.entity.Account">
        select * from mybatis.t_account;
    </select>
    <select id="findById" parameterType="long" resultType="com.song.entity.Account">
        select * from mybatis.t_account where id=#{id}
    </select>
    <select id="findByName" parameterType="java.lang.String"
            resultType="com.song.entity.Account">
        select * from mybatis.t_account where username = #{username}
    </select>
    <select id="findById2" parameterType="java.lang.Long"
            resultType="com.song.entity.Account">
        select * from mybatis.t_account where id = #{id}
    </select>
    <select id="findByNameAndAge" resultType="com.song.entity.Account">
        select * from mybatis.t_account where username = #{arg0} and age = #{arg1}
    </select>

</mapper>

package com.song.repository;

import com.song.entity.Account;

import java.util.List;

public interface AccountRepository {
    public int save(Account account);
    public int update(Account account);
    public int delete(long id);
    public List<Account> findAll();
    public Account findById(long id);
    public Account findByName(String username);
    public Account findById2(Long id);
    public Account findByNameAndAge(String name,int age);
}

package com.song.Test;

import com.song.entity.Account;
import com.song.repository.AccountRepository;
import org.apache.ibatis.io.ResolverUtil;
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.InputStream;
import java.util.ArrayList;
import java.util.List;

public class test2 {
    public static void main(String[] args) {
        //调⽤接⼝的代理对象完成相关的业务操作
        InputStream inputStream = Test.class.getClassLoader().getResourceAsstream("config.xml");
        sqlSessionFactoryBuilder sqlSessionFactoryBuilder = new sqlSessionFactoryBuilder();
        sqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
        sqlSession sqlSession = sqlSessionFactory.openSession();
        AccountRepository accountRepository = sqlSession.getMapper(AccountRepository.class);
      //添加对象
//                Account account = new Account(5L,"王五","111",223);
//        accountRepository.save(account);
//        sqlSession.commit();
//        sqlSession.close();
       // 查询全部对象
//        List<Account> list = accountRepository.findAll();
//        for (Account account1:
//             list) {
//            System.out.println(account1);
//        }
//        sqlSession.close();
//        int result = accountRepository.delete(3L);
//        System.out.println(result);
//        sqlSession.commit();
//        sqlSession.close();
//        Account byId = accountRepository.findById(1L);
//        System.out.println(byId);
//        sqlSession.close();
//        List<Account> list = accountRepository.findAll();
//        for (Account account:
//             list) {
//            System.out.println(account);
//        }
//         sqlSession.close();
        //修改
//        Account account = accountRepository.findById(1L);
//        account.setAge(176);
//        account.setUsername("邹松林");
//        account.setPassword("2739sd");
//        int update = accountRepository.update(account);
//        System.out.println(update);
//        sqlSession.commit();
//        sqlSession.close();
        //通过string类 通过name查询
//        Account account = accountRepository.findByName("邹松林");
//        System.out.println(account);
        //包装类，通过 id 查询 Account
//        Account byId2 = accountRepository.findById2(1L);
//        System.out.println(byId2);
        //4、多个参数，通过 name 和 age 查询 Account
        Account account = accountRepository.findByNameAndAge("邹松林", 176);
        System.out.println(account);
    }
}

package com.song.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class Account {
    private long id;
    private String username;
    private String password;
    private int age;
}

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