如何实现?主要分为以下两步骤
- 1.通过 Mapper 代理实现⾃定义接口
- 2.编写与方法相对应的 Mapper.xml
1.自定义接口AccountRepository
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package repository;
import entity.Account;
import java.util.List;
public interface AccountRepository {
public int save(Account account);
public int update(Account account);
public int deleteById( long id);
public List<Account> findAll();
public Account findById( long id);
}
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2.创建接⼝对应的 Mapper.xml,定义接口方法对应的 SQL 语句。
statement 标签可根据 SQL 执⾏的业务选择 insert、delete、update、select。 MyBatis 框架会根据规则⾃动创建接⼝实现类的代理对象
规则:
- Mapper.xml 中 namespace 为接⼝的全类名。
- Mapper.xml 中 statement 的 id 为接⼝中对应的⽅法名。
- Mapper.xml 中 statement 的 parameterType 和接⼝中对应⽅法的参数类型⼀致。
- Mapper.xml 中 statement 的 resultType 和接⼝中对应⽅法的返回值类型⼀致。
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<? 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 = "repository.AccountRepository" >
< insert id = "save" parameterType = "entity.Account" >
insert into t_account(username,password,age) values (#{username},#{password},#{age});
</ insert >
< update id = "update" parameterType = "entity.Account" >
update t_account set username=#{username},password=#{password},age=#{age} where id=#{id};
</ update >
< delete id = "deleteById" parameterType = "long" >
delete from t_account where id=#{id};
</ delete >
< select id = "findAll" resultType = "entity.Account" >
select * from t_account;
</ select >
< select id = "findById" parameterType = "long" resultType = "entity.Account" >
select * from t_account where id =#{id};
</ select >
</ mapper >
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3.在 config.xml 中注册 AccountRepository.xml
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< mappers >
< mapper resource = "mapper/AccountMapper.xml" ></ mapper >
< mapper resource = "repository/AccountRepository.xml" ></ mapper >
</ mappers >
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4.调用接⼝的代理对象完成相关的业务操作
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package Test;
import entity.Account;
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 repository.AccountRepository;
import java.io.InputStream;
import java.util.List;
public class Test1 {
public static void main(String[] args) {
InputStream inputStream= ResolverUtil.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 );
// List<Account> list=accountRepository.findAll();
// for(Account account:list){
// System.out.println(account);
// }
// sqlSession.close();
//添加
// Account account=new Account(3L,"wangwu","555555",122);
// accountRepository.save(account);
// sqlSession.commit();
//通过id查找对象
// Account account=accountRepository.findById(3L);
// System.out.println(account);
// sqlSession.close();
//通过id改对象
// Account account=accountRepository.findById(2L);
// account.setUsername("alibaba");
// account.setPassword("12345678");
// account.setAge(11);
// int result=accountRepository.update(account);
// sqlSession.commit();
// System.out.println(result);
// sqlSession.close();
//删除
int result=accountRepository.deleteById(3L);
sqlSession.commit();
System.out.println(result);
sqlSession.close();
}
}
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以上就是java应用开发之Mybatis通过Mapper代理自定义接口的实现的详细内容,更多关于Mybatis通过Mapper代理自定义接口的资料请关注服务器之家其它相关文章!
原文链接:https://blog.csdn.net/DrLai/article/details/119682671