SSM学习33：Spring整合MyBatis（重点）

数据库准备工作

1.先创建数据库

use mybatis;
create table tbl_account
(
    id INT(11),
    name VARCHAR(25),
    money double
);
insert into tbl_account (id, name, money)
values (1,'郭浩康',100);
select *
from tbl_account;

2.创建实体类Account.class

package com.itheima.domain;
 
import java.io.Serializable;
 
public class Account implements Serializable {
 
    private Integer id;
    private String name;
    private Double money;
 
    public Integer getId() {
        return id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public Double getMoney() {
        return money;
    }
 
    public void setMoney(Double money) {
        this.money = money;
    }
 
    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

 3.创建连接文件jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useSSL=false
jdbc.username=root
jdbc.password=root

4.创建配置类JdbcConfig.class

package com.itheima.config;
 
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
import javax.sql.DataSource;
 
 
public class JdbcConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String userName;
    @Value("${jdbc.password}")
    private String password;
 
    @Bean
    public DataSource dataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(driver);
        ds.setUrl(url);
        ds.setUsername(userName);
        ds.setPassword(password);
        return ds;
    }
}

5.MybatisConfig.class

/*MybatisConfig
* 连个bean
* SqlSessionFactoryBean和代理MapperScannerConfigurer
* */

package com.itheima.config;
 
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
 
import javax.sql.DataSource;
 
/*MybatisConfig
* 连个bean
* SqlSessionFactoryBean和代理MapperScannerConfigurer
* */
public class MybatisConfig {
    //定义bean，SqlSessionFactoryBean，用于产生SqlSessionFactory对象
    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
        SqlSessionFactoryBean ssfb=new SqlSessionFactoryBean();
        ssfb.setTypeAliasesPackage("com.itheima.domain");
        ssfb.setDataSource(dataSource);
        return ssfb;
    }
//
    //定义bean，返回MapperScannerConfigurer对象
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.itheima.dao");
        return msc;
    }
}
 
 
 

Spring准备工作

1创建MyBatis注解的数据层接口AccountDao.class

package com.itheima.dao;
 
import com.itheima.domain.Account;
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 AccountDao {
 
    @Insert("insert into tbl_account(name,money)values(#{name},#{money})")
    void save(Account account);
 
    @Delete("delete from tbl_account where id = #{id} ")
    void delete(Integer id);
 
    @Update("update tbl_account set name = #{name} , money = #{money} where id = #{id} ")
    void update(Account account);
 
    @Select("select * from tbl_account")
    List findAll();
 
    @Select("select * from tbl_account where id = #{id} ")
    Account findById(Integer id);
}

2.创建业务层接口和实现类

2.1 AccountService.class

package com.itheima.service;
 
import com.itheima.domain.Account;
 
import java.util.List;
 
public interface AccountService {
 
    void save(Account account);
 
    void delete(Integer id);
 
    void update(Account account);
 
    List findAll();
 
    Account findById(Integer id);
 
}

2.2 AccountServiceImpl.class

package com.itheima.service.impl;
 
import com.itheima.dao.AccountDao;
import com.itheima.domain.Account;
import com.itheima.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import java.util.List;
@Service
public class AccountServiceImpl implements AccountService {
 
    @Autowired
    private AccountDao accountDao;
 
    public void save(Account account) {
        accountDao.save(account);
    }
 
    public void update(Account account){
        accountDao.update(account);
    }
 
    public void delete(Integer id) {
        accountDao.delete(id);
    }
 
    public Account findById(Integer id) {
        return accountDao.findById(id);
    }
 
    public List findAll() {
        return accountDao.findAll();
    }
}

   3. 创建配置类SpringConfig.class

package com.itheima.config;
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
 
//SpringConfig创建步骤（4步）
// 申明配置类@Configuration
//扫描包@ComponentScan("com.itheima")
//加载jdbc文件@PropertySource("classpath:jdbc.properties")
//导入jdbc类@Import({JdbcConfig.class,MybatisConfig.class})
@Configuration
@ComponentScan("com.itheima")
//@PropertySource：加载类路径jdbc.properties文件
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
public class SpringConfig {
 
}

4.创建测试类App2.class

import com.itheima.config.SpringConfig;
import com.itheima.domain.Account;
import com.itheima.service.AccountService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 
public class App2 {
    public static void main(String[] args) {
        //加载Spring配置文件
        ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
 
        AccountService accountService = ctx.getBean(AccountService.class);
 
        Account ac = accountService.findById(1);
        System.out.println(ac);
    }
}