Spring整合MyBatis和Junit

系列文章目录

Spring整合MyBatis和Junit

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前言

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一、Spring整合Mybatis

spring整合mybatis主要为导入数据源的bean和创建数据库连接池（SQLSessionFactory）的bean以及Mapper代理的bean

1.将数据源进行配置

package org.example.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

public class JdbcConfig {

    @Value("${jdbc.driver}")
    private String drive;
    @Value("${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(drive);
        ds.setUrl(url);
        ds.setUsername(username);
        ds.setPassword(password);
        return ds;
    }
}

2.获取SQLSessionFactory对象和进行Mapper代理的配置

package org.example.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

public class MybatisConfig {

    //定义bean，SqlSessionFactoryBean，用于产生SqlSessionFactory对象
    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean ssfb=new SqlSessionFactoryBean();
        ssfb.setTypeAliasesPackage("org.example.domain");
        ssfb.setDataSource(dataSource);
        return ssfb;
    }

    //定义bean，返回MapperScannerConfigurer对象
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc=new MapperScannerConfigurer();
        msc.setBasePackage("org.example.dao");
        return msc;
    }
}

3.spring的核心配置类

package org.example.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;

@Configuration
@ComponentScan("org.example")
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
public class SpringConfig {
}

4.其他类

数据库的Mapper代理开发

package org.example.dao;

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 org.example.domain.Account;

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<Account> findAll();

    @Select("select * from tbl_account where id = #{id} ")
    Account findById(Integer id);
}

数据库对象持久层类

package org.example.domain;

public class Account {
    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 +
                '}';
    }
}

业务层实现类

package org.example.service.impl;

import org.example.dao.AccountDao;
import org.example.domain.Account;
import org.example.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 delete(Integer id) {
        accountDao.delete(id);
    }

    public void update(Account account) {
        accountDao.update(account);
    }

    public List<Account> findAll() {
        List<Account> accounts = accountDao.findAll();
        return accounts;
    }

    public Account findById(Integer id) {
        Account account = accountDao.findById(id);
        return account;
    }
}

业务层接口类

package org.example.service;

import org.example.domain.Account;

import java.util.List;

public interface AccountService {
    void save(Account account);

    void delete(Integer id);

    void update(Account account);

    List<Account> findAll();

    Account findById(Integer id);
}

spring加载类

import javafx.application.Application;
import org.example.config.SpringConfig;
import org.example.domain.Account;
import org.example.service.AccountService;
import org.example.service.impl.AccountServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class App2 {
    public static void main(String[] args) {
        //加载配置类
        ApplicationContext ctx=new AnnotationConfigApplicationContext(SpringConfig.class);
        //获取bean
        AccountService accountService = ctx.getBean(AccountServiceImpl.class);

        Account ac = accountService.findById(2);

        System.out.println(ac);
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>spring-02-mybatis</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!--spring的jar包-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.21</version>
        </dependency>
        <!--数据库连接池jar包-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.15</version>
        </dependency>
        <!--mybatis的jar包-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.9</version>
        </dependency>
        <!--mysql的jar包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.29</version>
        </dependency>
        <!--spring操作数据库的包-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.21</version>
        </dependency>
        <!--spring整合mybatis的包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.7</version>
        </dependency>
    </dependencies>

</project>

jdbc.properties文件

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

二、Spring整合Junit

package org.example.service;

import org.example.domain.Account;

import java.util.List;

public interface AccountService {
    void save(Account account);

    void delete(Integer id);

    void update(Account account);

    List<Account> findAll();

    Account findById(Integer id);
}

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总结

重点学习spring整合MyBatis的技术