Spring Boot + Spring Cloud 实现权限管理系统 后端篇(四):集成 MyBatis 框架

引入依赖

Spring Boot对于MyBatis的支持需要引入mybatis-spring-boot-starter的pom文件。

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>

在加添MySQL等相关依赖后,完整的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>com.louis</groupId>
    <artifactId>kitty-admin</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>kitty-admin</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <mybatis.spring.version>1.3.2</mybatis.spring.version>
    </properties>

    <dependencies>
        <!-- spring boot -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${mybatis.spring.version}</version>
        </dependency>
        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>
    
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

添加配置

1.添加MyBatis配置

添加MyBatis配置类,配置相关扫描路径,包括DAO,Model,XML映射文件的扫描。

新建com.louis.kitty.admin.config包,并创建一个MyBatis配置类,MybatisConfig.java。

package com.louis.kitty.admin.config;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

@Configuration
@MapperScan("com.louis.kitty.**.dao")    // 扫描DAO
public class MybatisConfig {
  @Autowired
  private DataSource dataSource;

  @Bean
  public SqlSessionFactory sqlSessionFactory() throws Exception {
    SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
    sessionFactory.setDataSource(dataSource);
    sessionFactory.setTypeAliasesPackage("com.louis.kitty.**.model");    // 扫描Model
    
    PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
    sessionFactory.setMapperLocations(resolver.getResources("classpath*:**/sqlmap/*.xml"));    // 扫描映射文件
    
    return sessionFactory.getObject();
  }
}

2.添加数据源配置

打开 application.yml ,添加MySQL数据源连接信息。

 

server:
  port: 8088
spring:
  datasource:
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mango?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
    username: root
    password: 123456

 

生成MyBatis模块

由于手动编写MyBatis的Model、DAO、XML映射文件比较繁琐,通常都会通过一些生成工具来生成。MyBatis官方也提供了生成工具(MyBaits Generator),另外还有一些基于官方基础上改进的第三方工具,比如MyBatis Plus就是国内提供的一款非常优秀的开源工具,网上相关教程比较多,这里就不再赘述了。

这里提供一些资料作为参考。

Mybatis Generator 官网:http://www.mybatis.org/generator/index.html

Mybatis Generator 教程:https://blog.csdn.net/testcs_dn/article/details/77881776

MyBatis Plus 官网: http://mp.baomidou.com/#/

MyBatis Plus 官网: http://mp.baomidou.com/#/quick-start

 

代码生成好之后,分別将Domain、DAO、XML映射文件拷贝到相应的包里。

 

打开Mapper,我们看到MyBatis Generator给我们默认生成了一些增删改查的方法。

package com.louis.kitty.admin.dao;

import com.louis.kitty.admin.model.SysUser;

public interface SysUserMapper {
    int deleteByPrimaryKey(Long userId);

    int insert(SysUser record);

    int insertSelective(SysUser record);

    SysUser selectByPrimaryKey(Long userId);

    int updateByPrimaryKeySelective(SysUser record);

    int updateByPrimaryKey(SysUser record);
}

编写服务接口

向 SysUserMapper 类中新一个 selectAll 方法,用于查询所有的用户信息。

package com.louis.kitty.admin.dao;

import java.util.List;

import com.louis.kitty.admin.model.SysUser;

public interface SysUserMapper {
    int deleteByPrimaryKey(Long userId);

    int insert(SysUser record);

    int insertSelective(SysUser record);

    SysUser selectByPrimaryKey(Long userId);

    int updateByPrimaryKeySelective(SysUser record);

    int updateByPrimaryKey(SysUser record);

    /**
     * 查询全部
     * @return
     */
    List<SysUser> selectAll();
}

向 SysUserMapper.xml 中加入 selectAll 的查询语句。

  <select id="selectAll" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from sys_user
  </select>

编写 SysUserService 接口,包含 selectAll 和 findByUserId 两个方法。

package com.louis.kitty.admin.sevice;

import java.util.List;

import com.louis.kitty.admin.model.SysUser;

public interface SysUserService {

    /**
     * 根据用户ID查找用户
     * @param userId
     * @return
     */
    SysUser findByUserId(Long userId);

    /**
     * 查找所有用户
     * @return
     */
    List<SysUser> findAll();

}

编写 SysUserServiceImpl 实现类,调用 SysUserMapper 方法完成查询操作。

package com.louis.kitty.admin.sevice.impl;

import java.util.List;

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

import com.louis.kitty.admin.dao.SysUserMapper;
import com.louis.kitty.admin.model.SysUser;
import com.louis.kitty.admin.sevice.SysUserService;

@Service
public class SysUserServiceImpl implements SysUserService {
    
    @Autowired
    private SysUserMapper sysUserMapper;
    
    @Override
    public SysUser findByUserId(Long userId) {
        return sysUserMapper.selectByPrimaryKey(userId);
    }

    @Override
    public List<SysUser> findAll() {
        return sysUserMapper.selectAll();
    }
}

编写 SysUserController restful 接口,返回JSON数据格式,提供外部调用。

package com.louis.kitty.admin.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.louis.kitty.admin.sevice.SysUserService;

@RestController
@RequestMapping("user")
public class SysUserController {

    @Autowired
    private SysUserService sysUserService;
    
    @GetMapping(value="/findByUserId")
    public Object findByUserId(@RequestParam Long userId) {
        return sysUserService.findByUserId(userId);
    }
    
    @GetMapping(value="/findAll")
    public Object findAll() {
        return sysUserService.findAll();
    }
}

打包资源

虽然代码编写已经完成,但此时启动运行还是会有问题的,因为在编译打包的时候,我们的XML映射文件是不在默认打包范围内的,所以需要修改一下配置。

修改 pom.xml ,在 build 标签内加入形如以下的 resource 标签的打包配置,这样代码打包时就会把映射文件也拷贝过去了。

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <!-- 打包时拷贝MyBatis的映射文件 -->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/sqlmap/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>  
                <directory>src/main/resources</directory>  
                    <includes> 
                        <include>**/*.*</include>  
                    </includes> 
                    <filtering>true</filtering>  
            </resource> 
        </resources>
    </build>

测试运行

编译启动,分别访问: http://localhost:8088/user/findAll, http://localhost:8088/user/findByUserId?userId=1,都能看到结果正常返回。

 http://localhost:8088/user/findByUserId?userId=1

http://localhost:8088/user/findAll

源码下载

后端:https://gitee.com/liuge1988/kitty

前端:https://gitee.com/liuge1988/kitty-ui.git


作者:朝雨忆轻尘
出处:https://www.cnblogs.com/xifengxiaoma/ 
版权所有,欢迎转载,转载请注明原文作者及出处。

 

posted on 2018-08-16 18:44  朝雨忆轻尘  阅读(6906)  评论(0编辑  收藏  举报