• springBoot+Mybatis模板代码


    目录

      1 目录结构

      2 全局配置文件

        2.1 application.properties(resources下,自动生成)

        2.2 mybatis-config.xml(resources下,手动创建)

        2.3 config文件夹(java包下,手动创建)

          2.3.1 mapper文件夹

          2.3.2 service文件夹

      3 代码流程

        3.1 第一步:Entity层

        3.2 第二步:Dao层

        3.3 第三步:Mapper配置文件

        3.4 第四部:测试Dao层类

        3.4 第五步:service层

        3.5 第六步:controller层

      4 运行效果

    1 目录结构

       

        注意:

        1)Java包下的子文件夹需要手动创建

         2)resources下的mapper文件夹和mybatis-config.xml文件需要手动创建。

    2 全局配置文件

      全局配置文件主要包括数据库配置、服务端口配置、事务配置等。

    2.1 application.properties(resources下,自动生成)

      application.properties是全局配置文件,通过修改此文件可以实现自定义配置,如端口、根路径等。

    本模板仅配置数据源配置,配置如下:

      

    #DataSource
    #数据库驱动(高版本mysql配置)
    jdbc.driver=com.mysql.cj.jdbc.Driver
    #数据库链接(高版本mysql配置)
    jdbc.url=jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone = GMT
    #数据库用户名
    jdbc.username=root
    #数据库密码
    jdbc.password=1234
    
    #Mybatis
    mybatis_config_file=mybatis-config.xml
    mapper_path=/mapper/**.xml
    # 要与包名一致
    type_alias_package=com.example.demo.entity

    2.2 mybatis-config.xml(resources下,手动创建)

      此文件需要手动创建。名称可以自定义,需要与application.properties中一致。

      配置如下:

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE configuration
            PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
        <!-- 配置全局属性 -->
        <settings>
            <!-- 使用jdbc的getGeneratedKeys获取数据库自增主键值 -->
            <setting name="useGeneratedKeys" value="true" />
    
            <!-- 使用列标签替换列别名 默认:true -->
            <setting name="useColumnLabel" value="true" />
    
            <!-- 开启驼峰命名转换:Table{create_time} -> Entity{createTime} -->
            <setting name="mapUnderscoreToCamelCase" value="true" />
        </settings>
    </configuration>

    2.3 config文件夹(java包下,手动创建)

      本项目中,config文件夹下包含两个子文件夹mapper和service

    2.3.1 mapper文件夹

      mapper文件夹中为数据源的相关配置,主要实现全局配置文件Application.properties中的配置生效。

      1)DataSourceConfiguration(数据配置类)

        代码如下:

          

    package com.example.demo.config.mapper;
    
    
    import java.beans.PropertyVetoException;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import com.mchange.v2.c3p0.ComboPooledDataSource;
    
    /**
     * 配置datasource到ioc容器里面
     *
     * @author xiangze
     *
     */
    @Configuration
    // 配置mybatis mapper的扫描路径
    @MapperScan("com.example.demo.dao")
    public class DataSourceConfiguration {
        @Value("${jdbc.driver}")
        private String jdbcDriver;
        @Value("${jdbc.url}")
        private String jdbcUrl;
        @Value("${jdbc.username}")
        private String jdbcUsername;
        @Value("${jdbc.password}")
        private String jdbcPassword;
    
        /**
         * 生成与spring-dao.xml对应的bean dataSource
         *
         * @return
         * @throws PropertyVetoException
         */
        @Bean(name = "dataSource")
        public ComboPooledDataSource createDataSource() throws PropertyVetoException {
            // 生成datasource实例
            ComboPooledDataSource dataSource = new ComboPooledDataSource();
            // 跟配置文件一样设置以下信息
            // 驱动
            dataSource.setDriverClass(jdbcDriver);
            // 数据库连接URL
            dataSource.setJdbcUrl(jdbcUrl);
            // 设置用户名
            dataSource.setUser(jdbcUsername);
            // 设置用户密码
            dataSource.setPassword(jdbcPassword);
            // 配置c3p0连接池的私有属性
            // 连接池最大线程数
            dataSource.setMaxPoolSize(30);
            // 连接池最小线程数
            dataSource.setMinPoolSize(10);
            // 关闭连接后不自动commit
            dataSource.setAutoCommitOnClose(false);
            // 连接超时时间
            dataSource.setCheckoutTimeout(10000);
            // 连接失败重试次数
            dataSource.setAcquireRetryAttempts(2);
            return dataSource;
        }
    }
    DataSourceConfiguration

      2)SessionFactoryConfiguration(数据库连接池配置类)

        代码如下:

    package com.example.demo.config.mapper;
    
    import java.io.IOException;
    
    import javax.sql.DataSource;
    
    import org.mybatis.spring.SqlSessionFactoryBean;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.core.io.ClassPathResource;
    import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
    import org.springframework.core.io.support.ResourcePatternResolver;
    
    @Configuration
    public class SessionFactoryConfiguration {
        // mybatis-config.xml配置文件的路径
        private static String mybatisConfigFile;
    
        @Value("${mybatis_config_file}")
        public void setMybatisConfigFile(String mybatisConfigFile) {
            SessionFactoryConfiguration.mybatisConfigFile = mybatisConfigFile;
        }
    
        // mybatis mapper文件所在路径
        private static String mapperPath;
    
        @Value("${mapper_path}")
        public void setMapperPath(String mapperPath) {
            SessionFactoryConfiguration.mapperPath = mapperPath;
        }
    
        // 实体类所在的package
        @Value("${type_alias_package}")
        private String typeAliasPackage;
    
        @Autowired
        private DataSource dataSource;
    
        /**
         * 创建sqlSessionFactoryBean 实例 并且设置configtion 设置mapper 映射路径 设置datasource数据源
         *
         * @return
         * @throws IOException
         */
        @Bean(name = "sqlSessionFactory")
        public SqlSessionFactoryBean createSqlSessionFactoryBean() throws IOException {
            SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
            // 设置mybatis configuration 扫描路径
            sqlSessionFactoryBean.setConfigLocation(new ClassPathResource(mybatisConfigFile));
            // 添加mapper 扫描路径
            PathMatchingResourcePatternResolver pathMatchingResourcePatternResolver = new PathMatchingResourcePatternResolver();
            String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + mapperPath;
            sqlSessionFactoryBean.setMapperLocations(pathMatchingResourcePatternResolver.getResources(packageSearchPath));
            // 设置dataSource
            sqlSessionFactoryBean.setDataSource(dataSource);
            // 设置typeAlias 包扫描路径
            sqlSessionFactoryBean.setTypeAliasesPackage(typeAliasPackage);
            return sqlSessionFactoryBean;
        }
    
    }
    SessionFactoryConfiguration(数据库连接池配置类)

    2.3.2 service文件夹

      1)TransactionManagementConfiguration(事务配置类)

        代码如下:

            

    package com.example.demo.config.service;
    
    
    import javax.sql.DataSource;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.jdbc.datasource.DataSourceTransactionManager;
    import org.springframework.transaction.PlatformTransactionManager;
    import org.springframework.transaction.annotation.EnableTransactionManagement;
    import org.springframework.transaction.annotation.TransactionManagementConfigurer;
    
    /**
     * 对标spring-service里面的transactionManager
     * 继承TransactionManagementConfigurer是因为开启annotation-driven
     *
     * @author xiangze
     *
     */
    @Configuration
    // 首先使用注解 @EnableTransactionManagement 开启事务支持后
    // 在Service方法上添加注解 @Transactional 便可
    @EnableTransactionManagement
    public class TransactionManagementConfiguration implements TransactionManagementConfigurer {
    
        @Autowired
        // 注入DataSourceConfiguration里边的dataSource,通过createDataSource()获取
        private DataSource dataSource;
    
        @Override
        /**
         * 关于事务管理,需要返回PlatformTransactionManager的实现
         */
        public PlatformTransactionManager annotationDrivenTransactionManager() {
            return new DataSourceTransactionManager(dataSource);
        }
    
    }
    TransactionManagementConfiguration(事务配置类)

    3 代码流程

      编写代码的顺序,便于快速实现和测试。

    3.1 第一步:Entity层

      实体类层,需要提前建立数据库、数据表并添加实例数据。

      代码如下:

    package com.example.demo.entity;
    
    
    import java.util.Date;
    
    /**
     * 区域信息
     * @author xiangze
     *
     */
    public class Area {
        // 主键ID
        private Integer areaId;
        // 名称
        private String areaName;
        // 权重,越大越排前显示
        private Integer priority;
        // 创建时间
        private Date createTime;
        // 更新时间
        private Date lastEditTime;
    
        public Integer getAreaId() {
            return areaId;
        }
    
        public void setAreaId(Integer areaId) {
            this.areaId = areaId;
        }
    
        public String getAreaName() {
            return areaName;
        }
    
        public void setAreaName(String areaName) {
            this.areaName = areaName;
        }
    
        public Integer getPriority() {
            return priority;
        }
    
        public void setPriority(Integer priority) {
            this.priority = priority;
        }
    
        public Date getCreateTime() {
            return createTime;
        }
    
        public void setCreateTime(Date createTime) {
            this.createTime = createTime;
        }
    
        public Date getLastEditTime() {
            return lastEditTime;
        }
    
        public void setLastEditTime(Date lastEditTime) {
            this.lastEditTime = lastEditTime;
        }
    
    }
    Area

    3.2 第二步:Dao层

      编写接口,代码如下:

    package com.example.demo.dao;
    
    import java.util.List;
    import com.example.demo.entity.Area;
    public interface AreaDao {
    
        /**
         * 列出区域列表
         *
         * @return areaList
         */
        List<Area> queryArea();
    
        /**
         * 根据Id列出具体区域
         *
         * @return area
         */
        Area queryAreaById(int areaId);
    
        /**
         * 插入区域信息
         *
         * @param area
         * @return
         */
        int insertArea(Area area);
    
        /**
         * 更新区域信息
         *
         * @param area
         * @return
         */
        int updateArea(Area area);
    
        /**
         * 删除区域信息
         *
         * @param areaId
         * @return
         */
        int deleteArea(int areaId);
    }
    AreaDao

    3.3 第三步:Mapper配置文件

      编写Dao层中的SQL语句,代码如下:

    <?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="com.example.demo.dao.AreaDao">
        <select id="queryArea" resultType="com.example.demo.entity.Area">
            SELECT area_id, area_name,
            priority, create_time, last_edit_time
            FROM tb_area
            ORDER BY priority
            DESC
        </select>
        <select id="queryAreaById" resultType="com.example.demo.entity.Area">
            SELECT area_id, area_name,
            priority, create_time, last_edit_time
            FROM tb_area
            WHERE
            area_id=#{areaId}
        </select>
        <insert id="insertArea" useGeneratedKeys="true" keyProperty="areaId"
                keyColumn="area_id" parameterType="com.example.demo.entity.Area">
            INSERT INTO
            tb_area(area_name,priority,
            create_time,last_edit_time)
            VALUES
            (#{areaName},#{priority},
            #{createTime},#{lastEditTime})
        </insert>
        <update id="updateArea" parameterType="com.example.demo.entity.Area">
            update tb_area
            <set>
                <if test="areaName != null">area_name=#{areaName},</if>
                <if test="priority != null">priority=#{priority},</if>
                <if test="lastEditTime != null">last_edit_time=#{lastEditTime}</if>
            </set>
            where area_id=#{areaId}
        </update>
        <delete id="deleteArea">
            DELETE FROM
            tb_area
            WHERE
            area_id =
            #{areaId}
        </delete>
    </mapper>
    AreaMapper.xml

    3.4 第四部:测试Dao层类

      测试Dao类是否可以正常操作数据库。代码如下:

      idea下快捷方式:选中Dao类名,按Alt+Insert(先按Alt再按Insert),勾选要测试的类。具体测试方法需要手动编写。

    package com.example.demo.dao;
    
    import static org.junit.Assert.assertEquals;
    
    import java.util.Date;
    import java.util.List;
    
    import org.junit.FixMethodOrder;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.junit.runners.MethodSorters;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    import com.example.demo.entity.Area;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    @FixMethodOrder(MethodSorters.NAME_ASCENDING) // 按方法名大小升序执行
    public class AreaDaoTest {
        //通过spring容器注入Dao的实现类
        @Autowired
        private AreaDao areaDao;
    
        @Test
        public void testAQueryArea() {
            List<Area> areaList = areaDao.queryArea();
            // 验证预期值和实际值是否相符
            assertEquals(2, areaList.size());
        }
    
        @Test
        public void testBInsertArea() {
            //创建一个区域对象
            Area area = new Area();
            area.setAreaName("测试区域");
            area.setCreateTime(new Date());
            area.setPriority(1);
            //将该对象实例添加入库
            int effectedNum = areaDao.insertArea(area);
            //检测影响行数
            assertEquals(1, effectedNum);
            //校验总数是否+1
            List<Area> areaList = areaDao.queryArea();
            assertEquals(3, areaList.size());
        }
    
        @Test
        public void testCQueryAreaById() {
            Area area = areaDao.queryAreaById(2);
            assertEquals("东苑", area.getAreaName());
        }
    
        @Test
        public void testDUpateArea() {
            List<Area> areaList = areaDao.queryArea();
            for (Area area : areaList) {
                if ("测试区域".equals(area.getAreaName())) {
                    // 对比之前的priority值
                    assertEquals(1, area.getPriority().intValue());
                    area.setPriority(2);
                    int effectedNum = areaDao.updateArea(area);
                    assertEquals(1, effectedNum);
                }
            }
        }
    
        @Test
        public void testEDeleteArea() {
            List<Area> areaList = areaDao.queryArea();
            for (Area area : areaList) {
                if ("测试区域".equals(area.getAreaName())) {
                    int effectedNum = areaDao.deleteArea(area.getAreaId());
                    assertEquals(1, effectedNum);
                }
            }
            // 重新获取一次列表,看看总数是否少1
            areaList = areaDao.queryArea();
            assertEquals(2, areaList.size());
        }
    }
    AreaDaoTest

    3.5 第四步:service层

      调用Dao层中的类实现业务逻辑,先写接口再实现,目录结构如下:

        

      代码如下:

        1)接口代码

    package com.example.demo.service;
    
    import java.util.List;
    
    import com.example.demo.entity.Area;
    public interface AreaService {
        /**
         * 获取区域列表
         *
         * @return
         */
        List<Area> getAreaList();
    
        /**
         * 通过区域Id获取区域信息
         *
         * @param areaId
         * @return
         */
        Area getAreaById(int areaId);
    
        /**
         * 增加区域信息
         *
         * @param area
         * @return
         */
        boolean addArea(Area area);
    
        /**
         * 修改区域信息
         *
         * @param area
         * @return
         */
        boolean modifyArea(Area area);
    
        /**
         * 删除区域信息
         *
         * @return
         */
        boolean deleteArea(int areaId);
    }
    AreaService

        2)实现类代码

       

    package com.example.demo.service.Impl;
    
    
    import java.io.IOException;
    import java.util.Date;
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    
    import com.example.demo.dao.AreaDao;
    import com.example.demo.entity.Area;
    import com.example.demo.service.AreaService;
    
    @Service
    public class AreaServiceImpl implements AreaService {
        @Autowired
        private AreaDao areaDao;
    
        @Override
        public List<Area> getAreaList() {
            // 返回所有的区域信息
            return areaDao.queryArea();
        }
    
        @Override
        public Area getAreaById(int areaId) {
            return areaDao.queryAreaById(areaId);
        }
    
        @Transactional
        @Override
        public boolean addArea(Area area) {
            // 空值判断,主要是判断areaName不为空
            if (area.getAreaName() != null && !"".equals(area.getAreaName())) {
                // 设置默认值
                area.setCreateTime(new Date());
                area.setLastEditTime(new Date());
                try {
                    int effectedNum = areaDao.insertArea(area);
                    if (effectedNum > 0) {
                        return true;
                    } else {
                        throw new RuntimeException("添加区域信息失败!");
                    }
                } catch (Exception e) {
                    throw new RuntimeException("添加区域信息失败:" + e.toString());
                }
            } else {
                throw new RuntimeException("区域信息不能为空!");
            }
        }
    
        @Transactional
        @Override
        public boolean modifyArea(Area area) {
            // 空值判断,主要是areaId不为空
            if (area.getAreaId() != null && area.getAreaId() > 0) {
                // 设置默认值
                area.setLastEditTime(new Date());
                try {
                    // 更新区域信息
                    int effectedNum = areaDao.updateArea(area);
                    if (effectedNum > 0) {
                        return true;
                    } else {
                        throw new RuntimeException("更新区域信息失败!");
                    }
                } catch (Exception e) {
                    throw new RuntimeException("更新区域信息失败:" + e.toString());
                }
            } else {
                throw new RuntimeException("区域信息不能为空!");
            }
        }
    
        @Transactional
        @Override
        public boolean deleteArea(int areaId) {
            if (areaId > 0) {
                try {
                    // 删除区域信息
                    int effectedNum = areaDao.deleteArea(areaId);
                    if (effectedNum > 0) {
                        return true;
                    } else {
                        throw new RuntimeException("删除区域信息失败!");
                    }
                } catch (Exception e) {
                    throw new RuntimeException("删除区域信息失败:" + e.toString());
                }
            } else {
                throw new RuntimeException("区域Id不能为空!");
            }
        }
    }
    AreaServiceImpl

        

    3.6 第五步:controller层

      controller负责接收请求和响应。

      代码如下:

    package com.example.demo.controller;
    
    
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.fasterxml.jackson.core.JsonParseException;
    import com.fasterxml.jackson.databind.JsonMappingException;
    import com.example.demo.entity.Area;
    import com.example.demo.service.AreaService;
    @RestController
    public class AreaController {
        @Autowired
        private AreaService areaService;
    
        /**
         * 获取所有的区域信息
         *
         * @return
         */
        @RequestMapping(value = "/listarea", method = RequestMethod.GET)
        private Map<String, Object> listArea() {
            Map<String, Object> modelMap = new HashMap<String, Object>();
            List<Area> list = new ArrayList<Area>();
            // 获取区域列表
            list = areaService.getAreaList();
            modelMap.put("areaList", list);
            return modelMap;
        }
    
        /**
         * 通过区域Id获取区域信息
         *
         * @return
         */
        @RequestMapping(value = "/getareabyid", method = RequestMethod.GET)
        private Map<String, Object> getAreaById(Integer areaId) {
            Map<String, Object> modelMap = new HashMap<String, Object>();
            // 获取区域信息
            Area area = areaService.getAreaById(areaId);
            modelMap.put("area", area);
            return modelMap;
        }
    
        /**
         * 添加区域信息
         *
         * @param area
         * @return
         * @throws IOException
         * @throws JsonMappingException
         * @throws JsonParseException
         */
        @RequestMapping(value = "/addarea", method = RequestMethod.POST)
        private Map<String, Object> addArea(@RequestBody Area area)
                throws JsonParseException, JsonMappingException, IOException {
            Map<String, Object> modelMap = new HashMap<String, Object>();
            // 添加区域信息
            modelMap.put("success", areaService.addArea(area));
            return modelMap;
        }
    
        /**
         * 修改区域信息,主要修改名字
         *
         * @param area
         * @return
         * @throws IOException
         * @throws JsonMappingException
         * @throws JsonParseException
         */
        @RequestMapping(value = "/modifyarea", method = RequestMethod.POST)
        private Map<String, Object> modifyArea(@RequestBody Area area)
                throws JsonParseException, JsonMappingException, IOException {
            Map<String, Object> modelMap = new HashMap<String, Object>();
            // 修改区域信息
            modelMap.put("success", areaService.modifyArea(area));
            return modelMap;
        }
    
        @RequestMapping(value = "/removearea", method = RequestMethod.GET)
        private Map<String, Object> removeArea(Integer areaId) {
            Map<String, Object> modelMap = new HashMap<String, Object>();
            System.out.println(areaId);
            // 修改区域信息
            modelMap.put("success", areaService.deleteArea(areaId));
            return modelMap;
        }
    }
    AreaServiceImpl

    4 运行效果

      

  • 相关阅读:
    微信小程序中样式问题
    根据后台数据,渲染多个坐标在小程序中
    配置vscode同步大神玺哥的配置
    vue总结
    回文数
    Pytorch的runtime error
    PyTorch图像预处理
    python isinstance()函数
    Java实现weightedUF
    Java Iterator
  • 原文地址:https://www.cnblogs.com/qingkongwuyun/p/12935731.html
Copyright © 2020-2023  润新知