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  • spring boot mybatis 整合教程

    本项目使用的环境:

    • 开发工具:Intellij IDEA 2017.1.3
    • springboot: 1.5.6
    • jdk:1.8.0_161
    • maven:3.3.9

    额外功能

    • PageHelper 分页插件
    • mybatis generator 自动生成代码插件

    步骤:

    1. 创建一个springboot项目:

    这里写图片描述

    2. 创建项目的文件结构以及jdk的版本

    这里写图片描述

    3. 选择项目所需要的依赖

    这里写图片描述

    这里写图片描述

    然后点击finish

    4. 看一下文件的结构:

    这里写图片描述

    5. 查看一下pom.xml:

      1 <?xml version="1.0" encoding="UTF-8"?>
      2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      3     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      4     <modelVersion>4.0.0</modelVersion>
      5 
      6     <groupId>com.winter</groupId>
      7     <artifactId>springboot-mybatis-demo</artifactId>
      8     <version>0.0.1-SNAPSHOT</version>
      9     <packaging>jar</packaging>
     10 
     11     <name>springboot-mybatis-demo</name>
     12     <description>Demo project for Spring Boot</description>
     13 
     14     <parent>
     15         <groupId>org.springframework.boot</groupId>
     16         <artifactId>spring-boot-starter-parent</artifactId>
     17         <version>1.5.6.RELEASE</version>
     18         <relativePath/> <!-- lookup parent from repository -->
     19     </parent>
     20 
     21     <properties>
     22         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     23         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     24         <java.version>1.7</java.version>
     25     </properties>
     26 
     27     <dependencies>
     28         <dependency>
     29             <groupId>org.mybatis.spring.boot</groupId>
     30             <artifactId>mybatis-spring-boot-starter</artifactId>
     31             <version>1.3.0</version>
     32         </dependency>
     33         <dependency>
     34             <groupId>org.springframework.boot</groupId>
     35             <artifactId>spring-boot-starter-thymeleaf</artifactId>
     36         </dependency>
     37         <dependency>
     38             <groupId>org.springframework.boot</groupId>
     39             <artifactId>spring-boot-starter-web</artifactId>
     40         </dependency>
     41 
     42         <dependency>
     43             <groupId>org.springframework.boot</groupId>
     44             <artifactId>spring-boot-starter-test</artifactId>
     45             <scope>test</scope>
     46         </dependency>
     47         <dependency>
     48             <groupId>mysql</groupId>
     49             <artifactId>mysql-connector-java</artifactId>
     50             <version>5.1.35</version>
     51         </dependency>
     52         
     53     
     54         <dependency>
     55             <groupId>com.fasterxml.jackson.core</groupId>
     56             <artifactId>jackson-core</artifactId>
     57         </dependency>
     58         <dependency>
     59             <groupId>com.fasterxml.jackson.core</groupId>
     60             <artifactId>jackson-databind</artifactId>
     61         </dependency>
     62         <dependency>
     63             <groupId>com.fasterxml.jackson.datatype</groupId>
     64             <artifactId>jackson-datatype-joda</artifactId>
     65         </dependency>
     66         <dependency>
     67             <groupId>com.fasterxml.jackson.module</groupId>
     68             <artifactId>jackson-module-parameter-names</artifactId>
     69         </dependency>
     70         <!-- 分页插件 -->
     71         <dependency>
     72             <groupId>com.github.pagehelper</groupId>
     73             <artifactId>pagehelper-spring-boot-starter</artifactId>
     74             <version>1.1.2</version>
     75         </dependency>
     76         <!-- alibaba的druid数据库连接池 -->
     77         <dependency>
     78             <groupId>com.alibaba</groupId>
     79             <artifactId>druid-spring-boot-starter</artifactId>
     80             <version>1.1.0</version>
     81         </dependency>
     82     </dependencies>
     83 
     84     <build>
     85         <plugins>
     86             <plugin>
     87                 <groupId>org.springframework.boot</groupId>
     88                 <artifactId>spring-boot-maven-plugin</artifactId>
     89             </plugin>
     90             <!-- mybatis generator 自动生成代码插件 -->
     91             <plugin>
     92                 <groupId>org.mybatis.generator</groupId>
     93                 <artifactId>mybatis-generator-maven-plugin</artifactId>
     94                 <version>1.3.2</version>
     95                 <configuration>
     96                     <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
     97                     <overwrite>true</overwrite>
     98                     <verbose>true</verbose>
     99                 </configuration>
    100             </plugin>
    101         </plugins>
    102     </build>
    103 
    104 
    105 </project>

    6. 项目不使用application.properties文件 而使用更加简洁的application.yml文件:

    将原有的resource文件夹下的application.properties文件删除,创建一个新的application.yml配置文件,

    文件的内容如下:

     1 server:
     2   port: 8080
     3 
     4 spring:
     5     datasource:
     6         name: test
     7         url: jdbc:mysql://127.0.0.1:3306/depot
     8         username: root
     9         password: root
    10         # 使用druid数据源
    11         type: com.alibaba.druid.pool.DruidDataSource
    12         driver-class-name: com.mysql.jdbc.Driver
    13         filters: stat
    14         maxActive: 20
    15         initialSize: 1
    16         maxWait: 60000
    17         minIdle: 1
    18         timeBetweenEvictionRunsMillis: 60000
    19         minEvictableIdleTimeMillis: 300000
    20         validationQuery: select 'x'
    21         testWhileIdle: true
    22         testOnBorrow: false
    23         testOnReturn: false
    24         poolPreparedStatements: true
    25         maxOpenPreparedStatements: 20
    26 
    27 ## 该配置节点为独立的节点,有很多同学容易将这个配置放在spring的节点下,导致配置无法被识别
    28 mybatis:
    29   mapper-locations: classpath:mapping/*.xml  #注意:一定要对应mapper映射xml文件的所在路径
    30   type-aliases-package: com.winter.model  # 注意:对应实体类的路径
    31 
    32 #pagehelper分页插件
    33 pagehelper:
    34     helperDialect: mysql
    35     reasonable: true
    36     supportMethodsArguments: true
    37     params: count=countSql

    7. 创建数据库:

    1 CREATE DATABASE mytest;
    2 
    3 CREATE TABLE t_user(
    4   user_id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    5   user_name VARCHAR(255) NOT NULL ,
    6   password VARCHAR(255) NOT NULL ,
    7   phone VARCHAR(255) NOT NULL
    8 ) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;

    8. 使用mybatis generator 自动生成代码:

    • 配置pom.xml中generator 插件所对应的配置文件 ${basedir}/src/main/resources/generator/generatorConfig.xml
     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <!DOCTYPE generatorConfiguration
     3         PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
     4         "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
     5 <generatorConfiguration>
     6     <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
     7     <classPathEntry  location="E:developermybatis-generator-core-1.3.2libmysql-connector-java-5.1.25-bin.jar"/>
     8     <context id="DB2Tables"  targetRuntime="MyBatis3">
     9         <commentGenerator>
    10             <property name="suppressDate" value="true"/>
    11             <!-- 是否去除自动生成的注释 true:是 : false:否 -->
    12             <property name="suppressAllComments" value="true"/>
    13         </commentGenerator>
    14         <!--数据库链接URL,用户名、密码 -->
    15         <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/mytest" userId="root" password="root">
    16         </jdbcConnection>
    17         <javaTypeResolver>
    18             <property name="forceBigDecimals" value="false"/>
    19         </javaTypeResolver>
    20         <!-- 生成模型的包名和位置-->
    21         <javaModelGenerator targetPackage="com.winter.model" targetProject="src/main/java">
    22             <property name="enableSubPackages" value="true"/>
    23             <property name="trimStrings" value="true"/>
    24         </javaModelGenerator>
    25         <!-- 生成映射文件的包名和位置-->
    26         <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources">
    27             <property name="enableSubPackages" value="true"/>
    28         </sqlMapGenerator>
    29         <!-- 生成DAO的包名和位置-->
    30         <javaClientGenerator type="XMLMAPPER" targetPackage="com.winter.mapper" targetProject="src/main/java">
    31             <property name="enableSubPackages" value="true"/>
    32         </javaClientGenerator>
    33         <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
    34         <table tableName="t_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    35     </context>
    36 </generatorConfiguration>
    • 点击run-Edit Configurations

    这里写图片描述

    • 添加配置

    这里写图片描述

    • 运行

    注意!!!同一张表一定不要运行多次,因为mapper的映射文件中会生成多次的代码,导致报错,切记

    这里写图片描述

    最后生成的文件以及结构:

    这里写图片描述

    9. 生成的文件

    UserMapper.java

     1 package com.winter.mapper;
     2 
     3 import com.winter.model.User;
     4 
     5 public interface UserMapper {
     6     int deleteByPrimaryKey(Integer userId);
     7 
     8     int insert(User record);
     9 
    10     int insertSelective(User record);
    11 
    12     User selectByPrimaryKey(Integer userId);
    13 
    14     int updateByPrimaryKeySelective(User record);
    15 
    16     int updateByPrimaryKey(User record);
    17     //这个方式我自己加的
    18     List<User> selectAllUser();
    19 }

    User.java

     1 package com.winter.model;
     2 
     3 public class User {
     4     private Integer userId;
     5 
     6     private String userName;
     7 
     8     private String password;
     9 
    10     private String phone;
    11 
    12     public Integer getUserId() {
    13         return userId;
    14     }
    15 
    16     public void setUserId(Integer userId) {
    17         this.userId = userId;
    18     }
    19 
    20     public String getUserName() {
    21         return userName;
    22     }
    23 
    24     public void setUserName(String userName) {
    25         this.userName = userName == null ? null : userName.trim();
    26     }
    27 
    28     public String getPassword() {
    29         return password;
    30     }
    31 
    32     public void setPassword(String password) {
    33         this.password = password == null ? null : password.trim();
    34     }
    35 
    36     public String getPhone() {
    37         return phone;
    38     }
    39 
    40     public void setPhone(String phone) {
    41         this.phone = phone == null ? null : phone.trim();
    42     }
    43 }

    对于sql语句这种黄色的背景,真心是看不下去了(解决方案):

    这里写图片描述

    **UserMapper.xml **

     1 <?xml version="1.0" encoding="UTF-8" ?>
     2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
     3 <mapper namespace="com.winter.mapper.UserMapper" >
     4   <resultMap id="BaseResultMap" type="com.winter.model.User" >
     5     <id column="user_id" property="userId" jdbcType="INTEGER" />
     6     <result column="user_name" property="userName" jdbcType="VARCHAR" />
     7     <result column="password" property="password" jdbcType="VARCHAR" />
     8     <result column="phone" property="phone" jdbcType="VARCHAR" />
     9   </resultMap>
    10   <sql id="Base_Column_List" >
    11     user_id, user_name, password, phone
    12   </sql>
    13   <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    14     select 
    15     <include refid="Base_Column_List" />
    16     from t_user
    17     where user_id = #{userId,jdbcType=INTEGER}
    18   </select>
    19   <!-- 这个方法是我自己加的 -->
    20   <select id="selectAllUser" resultMap="BaseResultMap">
    21     select
    22     <include refid="Base_Column_List" />
    23     from t_user
    24   </select>
    25   <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    26     delete from t_user
    27     where user_id = #{userId,jdbcType=INTEGER}
    28   </delete>
    29   <insert id="insert" parameterType="com.winter.model.User" >
    30     insert into t_user (user_id, user_name, password, 
    31       phone)
    32     values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
    33       #{phone,jdbcType=VARCHAR})
    34   </insert>
    35   <insert id="insertSelective" parameterType="com.winter.model.User" >
    36     insert into t_user
    37     <trim prefix="(" suffix=")" suffixOverrides="," >
    38       <if test="userId != null" >
    39         user_id,
    40       </if>
    41       <if test="userName != null" >
    42         user_name,
    43       </if>
    44       <if test="password != null" >
    45         password,
    46       </if>
    47       <if test="phone != null" >
    48         phone,
    49       </if>
    50     </trim>
    51     <trim prefix="values (" suffix=")" suffixOverrides="," >
    52       <if test="userId != null" >
    53         #{userId,jdbcType=INTEGER},
    54       </if>
    55       <if test="userName != null" >
    56         #{userName,jdbcType=VARCHAR},
    57       </if>
    58       <if test="password != null" >
    59         #{password,jdbcType=VARCHAR},
    60       </if>
    61       <if test="phone != null" >
    62         #{phone,jdbcType=VARCHAR},
    63       </if>
    64     </trim>
    65   </insert>
    66   <update id="updateByPrimaryKeySelective" parameterType="com.winter.model.User" >
    67     update t_user
    68     <set >
    69       <if test="userName != null" >
    70         user_name = #{userName,jdbcType=VARCHAR},
    71       </if>
    72       <if test="password != null" >
    73         password = #{password,jdbcType=VARCHAR},
    74       </if>
    75       <if test="phone != null" >
    76         phone = #{phone,jdbcType=VARCHAR},
    77       </if>
    78     </set>
    79     where user_id = #{userId,jdbcType=INTEGER}
    80   </update>
    81   <update id="updateByPrimaryKey" parameterType="com.winter.model.User" >
    82     update t_user
    83     set user_name = #{userName,jdbcType=VARCHAR},
    84       password = #{password,jdbcType=VARCHAR},
    85       phone = #{phone,jdbcType=VARCHAR}
    86     where user_id = #{userId,jdbcType=INTEGER}
    87   </update>
    88 </mapper>

    10. 打开类SpringbootMybatisDemoApplication.java,这个是springboot的启动类。我们需要添加点东西:

     1 package com.winter;
     2 
     3 import org.mybatis.spring.annotation.MapperScan;
     4 import org.springframework.boot.SpringApplication;
     5 import org.springframework.boot.autoconfigure.SpringBootApplication;
     6 
     7 @SpringBootApplication
     8 @MapperScan("com.winter.mapper")//将项目中对应的mapper类的路径加进来就可以了
     9 public class SpringbootMybatisDemoApplication {
    10 
    11     public static void main(String[] args) {
    12         SpringApplication.run(SpringbootMybatisDemoApplication.class, args);
    13     }
    14 }

    注意:@MapperScan("com.winter.mapper")这个注解非常的关键,这个对应了项目中mapper(dao)所对应的包路径,很多同学就是这里忘了加导致异常的

    11. 到这里所有的搭建工作都完成了,接下来就是测试的工作,没使用junit4进行测试:

    首先看一下完成之后的文件的结构:

    这里写图片描述

    现在controller,service层的代码都写好:

    UserController.java

     1 package com.winter.Controller;
     2 
     3 import com.winter.model.User;
     4 import com.winter.service.UserService;
     5 import org.springframework.beans.factory.annotation.Autowired;
     6 import org.springframework.stereotype.Controller;
     7 import org.springframework.web.bind.annotation.PathVariable;
     8 import org.springframework.web.bind.annotation.RequestMapping;
     9 import org.springframework.web.bind.annotation.ResponseBody;
    10 
    11 /**
    12  * Created by Administrator on 2017/8/16.
    13  */
    14 @Controller
    15 @RequestMapping(value = "/user")
    16 public class UserController {
    17 
    18     @Autowired
    19     private UserService userService;
    20 
    21     @ResponseBody
    22     @RequestMapping(value = "/add", produces = {"application/json;charset=UTF-8"})
    23     public int addUser(User user){
    24         return userService.addUser(user);
    25     }
    26 
    27     @ResponseBody
    28     @RequestMapping(value = "/all/{pageNum}/{pageSize}", produces = {"application/json;charset=UTF-8"})
    29     public Object findAllUser(@PathVariable("pageNum") int pageNum, @PathVariable("pageSize") int pageSize){
    30         
    31         return userService.findAllUser(pageNum,pageSize);
    32     }
    33 }

    UserService.java

     1 package com.winter.service;
     2 
     3 import com.winter.model.User;
     4 
     5 import java.util.List;
     6 
     7 /**
     8  * Created by Administrator on 2017/8/16.
     9  */
    10 public interface UserService {
    11 
    12     int addUser(User user);
    13 
    14     List<User> findAllUser(int pageNum, int pageSize);
    15 }

    UserServiceImpl.java

     1 package com.winter.service.impl;
     2 
     3 import com.github.pagehelper.PageHelper;
     4 import com.winter.mapper.UserMapper;
     5 import com.winter.model.User;
     6 import com.winter.service.UserService;
     7 import org.springframework.beans.factory.annotation.Autowired;
     8 import org.springframework.stereotype.Service;
     9 
    10 import java.util.List;
    11 
    12 /**
    13  * Created by Administrator on 2017/8/16.
    14  */
    15 @Service(value = "userService")
    16 public class UserServiceImpl implements UserService {
    17 
    18     @Autowired
    19     private UserMapper userMapper;//这里会报错,但是并不会影响
    20 
    21     @Override
    22     public int addUser(User user) {
    23 
    24         return userMapper.insertSelective(user);
    25     }
    26 
    27     /*
    28     * 这个方法中用到了我们开头配置依赖的分页插件pagehelper
    29     * 很简单,只需要在service层传入参数,然后将参数传递给一个插件的一个静态方法即可;
    30     * pageNum 开始页数
    31     * pageSize 每页显示的数据条数
    32     * */
    33     @Override
    34     public List<User> findAllUser(int pageNum, int pageSize) {
    35         //将参数传给这个方法就可以实现物理分页了,非常简单。
    36         PageHelper.startPage(pageNum, pageSize);
    37         return userMapper.selectAllUser();
    38     }
    39 }

    如果强迫症看不下去那个报错:(解决方法)

    这里写图片描述

    测试我使用了idea一个很用心的功能。

    可以发http请求的插件

    这里写图片描述

    这里写图片描述

    点击左侧的运行按钮就可以发送请求了;

    如果返回值正确 说明你已经搭建成功了!!

    ps:如果出现mapper注入不了的情况,请检查版本,当前博客的搭建方法只适合1.5.*版本的。

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  • 原文地址:https://www.cnblogs.com/aishangJava/p/10353694.html
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