Spring整合MyBatis

案例介绍

使用spring整合mybatis技术，完成账户模块（Account）的基础增删改查功能

表结构如下

列名	类型
id	int	主键、自增
name	varchar(24)	姓名,字符串，最多24个字符
money	double(10,2)	账户余额,最大值99999999.99。小数点前最多8位，小数点后最多2位。本案例使用double类型，实际开发中使用decimal(10,2)

XML方式整合

第一步 引入依赖

需要引入mysql,mybatis,spring,druid连接池,以及整合mybatis和spring的依赖

<dependencies>
    <!--Lombok-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.4</version>
    </dependency>
    <!--Spring核心-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.0.5.RELEASE</version>
    </dependency>
    <!--Spring集成Junit测试-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>5.0.5.RELEASE</version>
    </dependency>
    <!--Spring集成Aspect切面-->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.13</version>
    </dependency>
    <!--Spring 事物-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>5.0.5.RELEASE</version>
    </dependency>
    <!--mybatis-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.3</version>
    </dependency>
    <!--mysql-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.46</version>
    </dependency>
    <!--spring连接数据库-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.6.RELEASE</version>
    </dependency>
    <!--数据库连接池-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.21</version>
    </dependency>
    <!--spring集成mybatis-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.0</version>
    </dependency>
    <!--junit-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
</dependencies>

第二步 创建数据库

/*
SQLyog Ultimate v12.09 (64 bit)
MySQL - 5.5.40 : Database - spring01
*********************************************************************
*/


/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/`spring01` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `spring01`;

/*Table structure for table `account` */

DROP TABLE IF EXISTS `account`;

CREATE TABLE `account` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(24) DEFAULT NULL,
  `money` double(10,2) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

/*Data for the table `account` */

insert  into `account`(`id`,`name`,`money`) values (1,'jack',1000.00),(2,'tom',1000.00),(3,'rose',1000.00);

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

第三步 创建dao\service\domain

创建实体类 Account

package cn.itcast.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Account {
    private Integer id;
    private String name;
    private Double money;
}

创建 Dao

package cn.itcast.dao;

import cn.itcast.domain.Account;

import java.util.List;

public interface AccountDao {
    List<Account> findAll();
}

创建Service

package cn.itcast.service;

import cn.itcast.domain.Account;

import java.util.List;

public interface AccountService {
    List<Account> findAll() ;
}

创建Service实现类

package cn.itcast.service.impl;

import cn.itcast.dao.AccountDao;
import cn.itcast.domain.Account;
import cn.itcast.service.AccountService;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;


public class AccountServiceImpl implements AccountService {
    private AccountDao accountDao;

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

    public AccountDao getAccountDao() {
        return accountDao;
    }

    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }
}

第四步 创建jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring01
jdbc.username=root
jdbc.password=root

第五步 创建mapper映射文件

映射文件的编写必须遵循下面两个原则：

1. 该映射文件必须和dao在相同的目录(包)下,比如接口在src/cn/itcast/dao目录下，那么配置文件也必须在resource/cn/itcast/dao目录下。
2. 配置文件的名字和dao接口名保持一致,这里叫AccountDao.xml。比如接口叫AccountDao.java,那么配置文件的名字必须叫AccountDao.xml

<?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="cn.itcast.dao.AccountDao">
    <!--配置查询所有-->
    <select id="findAll" resultType="account">
        select * from account
    </select>
</mapper>

第六步 创建 spring主配置文件

主配置文件名叫applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
                           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
">
    <!--1.集成数据库连接池-->
    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
    <bean id="ds" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!--2.集成mybatis-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--为mybatis配置数据库连接池-->
        <property name="dataSource" ref="ds"></property>
        <!--给指定包下的实体类起别名-->
        <property name="typeAliasesPackage" value="cn.itcast.domain"></property>
    </bean>

    <!--3.将dao的创建交给spring容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--表示dao目录下的接口的实现类对象会交给spring容器管理，并且spring容器在将实现类添加到容器中的时候，会自动给id赋值，我们不需要创建实现类-->
       <property name="basePackage" value="cn.itcast.dao"></property> 
    </bean>

    <!--4.将service的创建交给spring容器-->
    <bean class="cn.itcast.service.impl.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"></property>
    </bean>
</beans>

第七步 创建测试类

public class App {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        AccountService accountService = classPathXmlApplicationContext.getBean(AccountService.class);
        List<Account> all = accountService.findAll();
        System.out.println(all);
    }
}

注解方式整合

第一步 引入依赖

需要引入mysql,mybatis,spring,druid连接池,以及整合mybatis和spring的依赖

<dependencies>
    <!--Lombok-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.4</version>
    </dependency>
    <!--Spring核心-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.0.5.RELEASE</version>
    </dependency>
    <!--Spring集成Junit测试-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>5.0.5.RELEASE</version>
    </dependency>
    <!--Spring集成Aspect切面-->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.13</version>
    </dependency>
    <!--Spring 事物-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>5.0.5.RELEASE</version>
    </dependency>
    <!--mybatis-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.3</version>
    </dependency>
    <!--mysql-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.46</version>
    </dependency>
    <!--spring连接数据库-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.6.RELEASE</version>
    </dependency>
    <!--数据库连接池-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.21</version>
    </dependency>
    <!--spring集成mybatis-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.0</version>
    </dependency>
</dependencies>

第二步 创建数据库

/*
SQLyog Ultimate v12.09 (64 bit)
MySQL - 5.5.40 : Database - spring01
*********************************************************************
*/


/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/`spring01` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `spring01`;

/*Table structure for table `account` */

DROP TABLE IF EXISTS `account`;

CREATE TABLE `account` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(24) DEFAULT NULL,
  `money` double(10,2) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

/*Data for the table `account` */

insert  into `account`(`id`,`name`,`money`) values (1,'jack',1000.00),(2,'tom',1000.00),(3,'rose',1000.00);

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

第三步 创建dao\service\domain

创建实体类 Account

package cn.itcast.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Account {
    private Integer id;
    private String name;
    private Double money;
}

创建 Dao

package cn.itcast.dao;

import cn.itcast.domain.Account;
import org.apache.ibatis.annotations.Select;

import java.util.List;

public interface AccountDao {
    @Select("select * from account")
    List<Account> findAll();
}

创建Service

package cn.itcast.service;

import cn.itcast.domain.Account;

import java.util.List;

public interface AccountService {
    List<Account> findAll() ;
}

创建Service实现类

package cn.itcast.service.impl;

import cn.itcast.dao.AccountDao;
import cn.itcast.domain.Account;
import cn.itcast.service.AccountService;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;


public class AccountServiceImpl implements AccountService {
    private AccountDao accountDao;

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

    public AccountDao getAccountDao() {
        return accountDao;
    }

    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }
}

第四步 创建jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring01
jdbc.username=root
jdbc.password=root

第五步 创建数据库连接池的配置文件

package cn.itcast.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 org.springframework.context.annotation.PropertySource;

import javax.sql.DataSource;
//声明当前java类是配置文件
@Configuration
//引入jdbc.properties配置文件
@PropertySource("jdbc.properties")
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;


    //创建数据库连接池的bean对象，并交给srping容器管理
    @Bean
    public DataSource getDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setUsername(this.username);
        druidDataSource.setPassword(this.password);
        druidDataSource.setUrl(this.url);
        druidDataSource.setDriverClassName(this.driver);
        return druidDataSource;
    }
}

第六步 创建整合MyBatis的配置文件

package cn.itcast.config;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

@Configuration
public class MyBatisConfig {
    @Bean
    public SqlSessionFactoryBean getSqlSessionFactoryBean(@Autowired DataSource dataSource){
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setTypeAliasesPackage("cn.itcast.domain");
        sqlSessionFactoryBean.setDataSource(dataSource);
        return sqlSessionFactoryBean;
    }
    @Bean
    public MapperScannerConfigurer getMapperScannerConfigurer(){
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setBasePackage("cn.itcast.dao");
        return mapperScannerConfigurer;
    }
}

第七步 创建主配置文件

package cn.itcast.config;

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

@Configuration
@ComponentScan("cn.itcast")
@Import({JdbcConfig.class,MyBatisConfig.class})
public class AppConfig {
}

第八步 配置Service层

自定义类，如果需要交由Spring管理，添加 @Component,@Controller,@Service,@Repository 等注解

本案例在Service的实现类上添加注解

package cn.itcast.service.impl;

import cn.itcast.dao.AccountDao;
import cn.itcast.domain.Account;
import cn.itcast.service.AccountService;
import lombok.Data;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service("accountService")
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao ;
    public List<Account> findAll() {
        return accountDao.findAll();
    }

    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }
}

第九步 编写测试类

import cn.itcast.config.AppConfig;
import cn.itcast.domain.Account;
import cn.itcast.service.AccountService;
import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class AppTest {
    @Test
    public void findAll(){
        AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
        AccountService accountService = applicationContext.getBean(AccountService.class);
        List<Account> all = accountService.findAll();
        System.out.println(all);
    }
}