SpringCloud(第 044 篇)链接Mysql数据库简单的集成Mybatis框架采用MapperXml访问数据库


声明:本文转载自https://my.oschina.net/u/162754/blog/1553495,转载目的在于传递更多信息,仅供学习交流之用。如有侵权行为,请联系我,我会及时删除。

SpringCloud(第 044 篇)链接Mysql数据库简单的集成Mybatis框架采用MapperXml访问数据库

一、大致介绍

1、前面章节讲解的是在方法上面添加sql语句操作,虽然说仅仅只是一种简单的操作,在测试期间可以多试试; 2、但是对于复杂的操作,那种简单也仅仅只是简单的自己用用而已,复杂的还是得采用xml配置; 3、因此本章节就试试采用Mybatis框架通过mapperxml进行对数据的操作; 

二、实现步骤

2.1 添加 maven 引用包

<?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>  	<artifactId>springms-provider-user-mysql-mybatis-mapper</artifactId>     <version>1.0-SNAPSHOT</version>     <packaging>jar</packaging> 	     <parent>         <groupId>com.springms.cloud</groupId>         <artifactId>springms-spring-cloud</artifactId>         <version>1.0-SNAPSHOT</version>     </parent> 	 	<dependencies>         <!-- 访问数据库模块 -->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-data-jpa</artifactId>         </dependency>          <!-- web模块 -->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-web</artifactId>         </dependency>          <!-- MYSQL -->         <dependency>             <groupId>mysql</groupId>             <artifactId>mysql-connector-java</artifactId>         </dependency>          <!-- Mybatis依赖 -->         <dependency>             <groupId>org.mybatis.spring.boot</groupId>             <artifactId>mybatis-spring-boot-starter</artifactId>             <version>1.3.1</version>         </dependency>          <!-- Mysql分页PageHelper -->         <!--<dependency>-->             <!--<groupId>com.github.pagehelper</groupId>-->             <!--<artifactId>pagehelper</artifactId>-->         <!--</dependency>-->     </dependencies>  </project> 

2.2 添加应用配置文件(springms-provider-user-mysql-mybatis-mapper\src\main\resources\application.yml)

server:   port: 8330 spring:   application:     name: springms-provider-user-mysql-mybatis-mapper  #全部小写   ##################################################################################################### # mysql 属性配置   datasource:     driver-class-name: com.mysql.jdbc.Driver     url: jdbc:mysql://ip:3306/hmilyylimh     username: username     password: password #  jpa: #    hibernate: #      #ddl-auto: create #ddl-auto:设为create表示每次都重新建表 #      ddl-auto: update #ddl-auto:设为update表示每次都不会重新建表 #    show-sql: true #####################################################################################################  ##################################################################################################### # mybatis mapper xml 配置 mybatis:   # mybatis.type-aliases-package:指定domain类的基包,即指定其在*Mapper.xml文件中可以使用简名来代替全类名(看后边的UserMapper.xml介绍)   type-aliases-package:   mapper-locations: classpath:mybatis/mapper/*.xml   config-location: classpath:mybatis/mybatis-config.xml #####################################################################################################  ##################################################################################################### # 打印日志 logging:   level:     root: INFO     org.hibernate: INFO     org.hibernate.type.descriptor.sql.BasicBinder: TRACE     org.hibernate.type.descriptor.sql.BasicExtractor: TRACE     com.springms: DEBUG #####################################################################################################  

2.3 添加mybatis配置文件(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/entity/User.java)

<?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>      <settings>         <setting name="callSettersOnNulls" value="true"/>          <setting name="cacheEnabled" value="true"/>          <setting name="lazyLoadingEnabled" value="true"/>          <setting name="aggressiveLazyLoading" value="true"/>          <setting name="multipleResultSetsEnabled" value="true"/>          <setting name="useColumnLabel" value="true"/>          <setting name="useGeneratedKeys" value="false"/>          <setting name="autoMappingBehavior" value="PARTIAL"/>          <setting name="defaultExecutorType" value="SIMPLE"/>          <setting name="mapUnderscoreToCamelCase" value="true"/>          <setting name="localCacheScope" value="SESSION"/>          <setting name="jdbcTypeForNull" value="NULL"/>      </settings>      <typeAliases>         <typeAlias alias="Integer" type="java.lang.Integer" />         <typeAlias alias="Long" type="java.lang.Long" />         <typeAlias alias="HashMap" type="java.util.HashMap" />         <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />         <typeAlias alias="ArrayList" type="java.util.ArrayList" />         <typeAlias alias="LinkedList" type="java.util.LinkedList" />          <typeAlias alias="User" type="com.springms.cloud.entity.User"/>     </typeAliases>  </configuration> 

2.4 添加用户mapperxml映射文件(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/entity/User.java)

<?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.springms.cloud.mapper.IUserMapper">       <resultMap id="result" type="User">         <id column="id" property="id" jdbcType="BIGINT"/>         <result column="username" property="username" jdbcType="VARCHAR"/>         <result column="name" property="name" jdbcType="VARCHAR"/>         <result column="age" property="age" jdbcType="TINYINT"/>         <result column="balance" property="balance" jdbcType="VARCHAR"/>     </resultMap>       <!-- 若不需要自动返回主键,将useGeneratedKeys="true" keyProperty="id"去掉即可(当然如果不需要自动返回主键,直接用注解即可) -->     <insert id="insertUser" parameterType="User" useGeneratedKeys="false" keyProperty="id" >         <![CDATA[            INSERT INTO user            (                username,                name,                age,                balance            )            VALUES            (                #{username, jdbcType=VARCHAR},                #{name, jdbcType=VARCHAR},                #{age, jdbcType=TINYINT},                #{balance, jdbcType=VARCHAR}            )         ]]>     </insert>      <select id="findUserById" resultMap="result" parameterType="Long">         select * from user         where id = #{id,jdbcType=BIGINT}     </select>      <select id="findAllUsers" resultMap="result">         select * from user     </select> </mapper> 

2.5 添加实体用户类User(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/entity/User.java)

package com.springms.cloud.entity;  public class User {    private Long id;    private String username;    private String name;    private Integer age;    private String balance;    public Long getId() {     return this.id;   }    public void setId(Long id) {     this.id = id;   }    public String getUsername() {     return this.username;   }    public void setUsername(String username) {     this.username = username;   }    public String getName() {     return this.name;   }    public void setName(String name) {     this.name = name;   }    public Integer getAge() {     return this.age;   }    public void setAge(Integer age) {     this.age = age;   }    public String getBalance() {     return this.balance;   }    public void setBalance(String balance) {     this.balance = balance;   } }  

2.6 添加用户mapper接口(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/mapper/IUserMapper.java)

package com.springms.cloud.mapper;  import com.springms.cloud.entity.User; import org.apache.ibatis.annotations.Mapper;  import java.util.List;  /**  * 用户 mybatis 接口文件。  *  * @author hmilyylimh  *  * @version 0.0.1  *  * @date 2017-10-19  *  */ public interface IUserMapper {      User findUserById(Long id);      List<User> findAllUsers();      int insertUser(User user); } 

2.7 添加用户DAO接口类(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/dao/IUserDao.java)

package com.springms.cloud.dao;  import com.springms.cloud.entity.User;  import java.util.List;  /**  * 简单用户链接Mysql数据库微服务(通过@Repository注解标注该类为持久化操作对象)。  *  * @author hmilyylimh  *  * @version 0.0.1  *  * @date 2017-10-19  *  */ public interface IUserDao {      User findUserById(Long id);      List<User> findAllUsers();      int insertUser(User user); } 

2.8 添加用户DAO接口类实现类(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/dao/impl/UserDaoImpl.java)

package com.springms.cloud.dao.impl;  import com.springms.cloud.dao.IUserDao; import com.springms.cloud.entity.User; import com.springms.cloud.mapper.IUserMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository;  import java.util.List;  /**  * 简单用户链接Mysql数据库微服务(通过@Repository注解标注该类为持久化操作对象)。  *  * @author hmilyylimh  *  * @version 0.0.1  *  * @date 2017-10-19  *  */ @Repository public class UserDaoImpl implements IUserDao {      @Autowired     private IUserMapper iUserMapper;      @Override     public User findUserById(Long id) {         return iUserMapper.findUserById(id);     }      @Override     public List<User> findAllUsers() {         return iUserMapper.findAllUsers();     }      @Override     public int insertUser(User user) {         return iUserMapper.insertUser(user);     } }  

2.9 添加用户Service接口类(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/service/IUserService.java)

package com.springms.cloud.service;  import com.springms.cloud.entity.User;  import java.util.List;  /**  * 简单用户链接Mysql数据库微服务(通过@Service注解标注该类为持久化操作对象)。  *  * @author hmilyylimh  *  * @version 0.0.1  *  * @date 2017-10-19  *  */ public interface IUserService {      User findUserById(Long id);      List<User> findAllUsers();      int insertUser(User user); }  

2.10 添加用户Service接口实现类(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/service/impl/UserServiceImpl.java)

package com.springms.cloud.service.impl;  import com.springms.cloud.dao.IUserDao; import com.springms.cloud.entity.User; import com.springms.cloud.service.IUserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;  import java.util.List;  /**  * 简单用户链接Mysql数据库微服务(通过@Service注解标注该类为持久化操作对象)。  *  * @author hmilyylimh  *  * @version 0.0.1  *  * @date 2017-10-19  *  */ @Service public class UserServiceImpl implements IUserService {      @Autowired     IUserDao iUserDao;      @Override     public User findUserById(Long id) {         return iUserDao.findUserById(id);     }      @Override     public List<User> findAllUsers() {         return iUserDao.findAllUsers();     }      @Override     public int insertUser(User user) {         return iUserDao.insertUser(user);     } } 

2.11 添加用户Web访问层Controller(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/controller/ProviderUserMysqlMybatisMapperController.java)

package com.springms.cloud.controller;  import com.springms.cloud.entity.User; import com.springms.cloud.service.IUserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*;  import java.util.List;  /**  * 用户微服务Controller。  *  * @author hmilyylimh  *  * @version 0.0.1  *  * @date 2017-10-19  *  */ @RestController public class ProviderUserMysqlMybatisMapperController {      @Autowired     private IUserService iUserService;      @GetMapping("/simple/{id}")     public User findUserById(@PathVariable Long id) {         return this.iUserService.findUserById(id);     }      @GetMapping("/simple/list")     public List<User> findUserList() {         return this.iUserService.findAllUsers();     }      /**      * 添加一个student,使用postMapping接收post请求      *      * http://localhost:8330/simple/addUser?username=user11&age=11&balance=11      *      * @return      */     @PostMapping("/simple/addUser")     public User addUser(@RequestParam(value = "username", required=false) String username, @RequestParam(value = "age", required=false) Integer age, @RequestParam(value = "balance", required=false) String balance){         User user=new User();          user.setUsername(username);         user.setName(username);         user.setAge(age);         user.setBalance(balance);          int result = iUserService.insertUser(user);         if(result > 0){             return user;         }          user.setId(0L);         user.setName(null);         user.setUsername(null);         user.setBalance(null);         return user;     } }  

2.12 添加微服务启动类(springms-provider-user-mysql-mybatis-mapper/src/main/java/com/springms/cloud/MsProviderUserMysqlMybatisMapperApplication.java)

package com.springms.cloud;  import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;  /**  * 链接Mysql数据库简单的集成Mybatis框架采用MapperXml访问数据库。  *  * @author hmilyylimh  *  * @version 0.0.1  *  * @date 2017-10-19  *  */ @SpringBootApplication @MapperScan("com.springms.cloud.mapper.**") public class MsProviderUserMysqlMybatisMapperApplication {  	public static void main(String[] args) { 		SpringApplication.run(MsProviderUserMysqlMybatisMapperApplication.class, args); 		System.out.println("【【【【【【 链接MysqlMybatisMapperXml数据库微服务 】】】】】】已启动."); 	} } 

三、测试

/****************************************************************************************  注意:Mybatis 需要加上 entity 等注解才可以使用,不然启动都会报错;  @MapperScan("com.springms.cloud.mapper.**") 或者在每个 Mapper 接口文件上添加 @Mapper 也可以;   一、简单用户链接Mysql数据库微服务(通过 mybatis 链接 mysql 并用 MapperXml 编写数据访问):   1、启动 springms-provider-user-mysql-mybatis-mapper 模块服务,启动1个端口;  2、在浏览器输入地址 http://localhost:8330/simple/10 可以看到用户ID=10的信息成功的被打印出来;   3、使用 IDEA 自带工具 Test Restful WebService 发送 HTTP POST 请求,并添加 username、age、balance三个参数,然后执行请求,并去 mysql 数据库查看数据是否存在,正常情况下 mysql 数据库刚刚插入的数据成功了:  4、使用 REST Client 执行 "/simple/list" 接口,也正常将 mysql 数据库中所有的用户信息打印出来了;  ****************************************************************************************/  

四、下载地址

https://git.oschina.net/ylimhhmily/SpringCloudTutorial.git

SpringCloudTutorial交流QQ群: 235322432

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本文发表于2017年10月19日 18:34
(c)注:本文转载自https://my.oschina.net/u/162754/blog/1553495,转载目的在于传递更多信息,并不代表本网赞同其观点和对其真实性负责。如有侵权行为,请联系我们,我们会及时删除.

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