spring整合Mybatis | Postgresql为例

1.创建配置文件jdbc.properties

jdbc.url=jdbc:postgresql://localhost:5432/postgis_hy?useSSL=false
jdbc.username=postgres
jdbc.password=arcgis

2.相关依赖

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.6</version>
    </dependency>
    <dependency>
      <groupId>org.postgresql</groupId>
      <artifactId>postgresql</artifactId>
      <version>42.2.19</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.14.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.6</version>
    </dependency>

3.目录结构

a.配置类

// SpringConfig.java
package com.hye.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("com.hye")
@PropertySource("classpath:jdbc.properties")
@Import({JDBCConfig.class,MybatisConfig.class})
public class SpringConfig {
}

// JDBCConfig.java
package com.hye.config;

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

import javax.sql.DataSource;

public class JDBCConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;

    @Bean
    public DataSource dataSource(){
        PGSimpleDataSource pg = new PGSimpleDataSource();
        pg.setUrl(url);
        pg.setUser(username);
        pg.setPassword(password);
        return pg;
    }
}

// MybatisConfig.java
package com.hye.config;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

public class MybatisConfig {
    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
        ssfb.setTypeAliasesPackage("com.hye.entity");
        ssfb.setDataSource(dataSource);
        return ssfb;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.hye.dao");
        return msc;
    }
}

b.接口类

package com.hye.dao;

import com.hye.entity.Person;
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 PersonDao {
    @Insert("INSERT INTO test.posttest(name, age, sex) VALUES (#{name},#{age},#{sex})")
    void save(Person person);
    @Delete("delete from test.posttest where name=#{name}")
    void delete(String name);
    @Update("update test.posttest set name = #{name},age = #{age},sex = #{sex} where name = #{name}")
    void update(Person person);
    @Select("select * from test.posttest")
    List<Person> findAll();
    @Select("select * from test.posttest where name = #{name}")
    Person findByName(String name);
}

c.对象类

package com.hye.entity;

import org.springframework.beans.factory.annotation.Autowired;

import java.io.Serializable;

public class Person implements Serializable {
    @Autowired
    private String name;
    @Autowired
    private Integer age;
    @Autowired
    private String sex;

    @Override
    public String toString() {
        return "Person{"+
                "姓名="+name+
                ",年龄="+age+
                ",性别="+sex+
                "}";
    }
}

d.服务类

// PersonService.java
package com.hye.service;

import com.hye.entity.Person;

import java.util.List;

public interface PersonService {
    void save(Person person);
    void delete(String name);
    void update(Person person);
    List<Person> findAll();
    Person findByName(String name);
}

// PersonServiceImpl.java
package com.hye.service.impl;

import com.hye.dao.PersonDao;
import com.hye.entity.Person;
import com.hye.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class PersonServiceImpl implements PersonService {

    @Autowired
    private PersonDao personDao;
    public void save(Person person) {
        personDao.save(person);
    }

    public void update(Person person) {personDao.update(person);}

    public void delete(String name) {personDao.delete(name);}

    public Person findByName(String name) {
        return personDao.findByName(name);
    }

    public List<Person> findAll() {
        return personDao.findAll();
    }
}

e.主程序

package com.hye;

import com.hye.config.SpringConfig;
import com.hye.entity.Person;
import com.hye.service.PersonService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.GenericApplicationContext;

import java.util.List;

public class App {
    public static void main(String[] args) {
        ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        PersonService p = ctx.getBean(PersonService.class);
        Person all = p.findByName("小明");
        System.out.println(all);

    }
}

四、数据及运行结果

a.数据表

b.运行结果

箴言：因为这些东西是非常简单的。不要抱怨自己学不会，那是因为你没有足够用心。