【笔记】Spring整合MyBatis

Spring整合MyBatis学习笔记

pom.xml

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>5.2.10.RELEASE</version>
</dependency>

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.30</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</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.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>1.3.0</version>
</dependency>

<!-- 数据库连接池 -->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.1.16</version>
</dependency>

定义JDBC配置类

• 利用数据库连接池druid创建类型为DataSource的bean对象

src/main/java/com/conf/JDBCConfig.java

package com.conf;

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

import javax.sql.DataSource;

public class JDBCConfig {

@Bean
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dataSource.setUrl("");
        dataSource.setUsername("");
        dataSource.setPassword("");
        return dataSource;
    }
}

定义MyBatis配置类

sqlSessionFactoryBean.setTypeAliasesPackage("");：利用包扫描自动配置返回值类型别名。想当于<typeAliases><package name="com.pojo"/></typeAliases>配置
mapperScannerConfigurer.setBasePackage("");：配置Mapper扫描的包名

package com.conf;

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MyBatis配置的bean
     */
    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean (DataSource dataSource) {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setTypeAliasesPackage("com.pojo");
        sqlSessionFactoryBean.setDataSource(dataSource);
        return sqlSessionFactoryBean;
    }

/**
     * 定义Mapper扫描的bean
     */
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(DataSource dataSource) {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setBasePackage("com.dao");
        return mapperScannerConfigurer;
    }
}

定义全局配置类

• 引入JDBC配置
• 引入MyBatis配置

src/main/java/com/conf/SpringConfig.java

@ComponentScan("")：包扫描
@Import()：引入配置类

package com.conf;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

@Configuration
@ComponentScan("com")
@Import({JDBCConfig.class, MybatisConfig.class})
public class SpringConfig {
}

src/main/java/com/pojo/User.java

package com.pojo;

public class User {

private Integer id;
    private String name;

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;
    }

@Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

src/main/java/com/dao/UserDao.java

package com.dao;

import com.pojo.User;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public interface UserDao {

@Select("SELECT * FROM user")
    List<User> selectAll();
}

src/main/java/com/Application.java

package com;

import com.conf.SpringConfig;
import com.dao.UserDao;
import com.pojo.User;
import com.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.util.List;

public class Application {

public static void main(String[] args) {
        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(SpringConfig.class);
        UserDao userDao = applicationContext.getBean(UserDao.class);
        List<User> users = userDao.selectAll();
        System.out.println(users);
    }
}

哔哩哔哩——黑马程序员

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