spingBoot整合mybatis+generator+pageHelper

水深无声 2021-12-15 08:37 254阅读 0赞

## 环境/版本一览： ##

*  开发工具：Intellij IDEA 2018.1.4
 *  springboot: 2.0.4.RELEASE
 *  jdk：1.8.0\_40
 *  maven:3.3.9
 *  alibaba Druid 数据库连接池：1.1.9

### 额外功能： ###

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

## 开始搭建： ##

### 创建项目： ###

![1419013-20180907150053099-1344401562.png][]

![1419013-20180907150257549-92116291.png][]

![1419013-20180907150359105-1415851617.png][]

![1419013-20180907150422563-142861242.png][]

看一下文件结构：

![1419013-20180907151012757-505574023.png][]

查看一下pom.xml：

补齐依赖：

<?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.denwgei</groupId>
        <artifactId>springbootmybatis</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>springbootmybatis</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/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jdbc</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.2</version>
            </dependency>
    
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>3.4</version>
            </dependency>
    
    
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-core</artifactId>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.datatype</groupId>
                <artifactId>jackson-datatype-joda</artifactId>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.module</groupId>
                <artifactId>jackson-module-parameter-names</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper-spring-boot-starter</artifactId>
                <version>1.2.5</version>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid-spring-boot-starter</artifactId>
                <version>1.1.9</version>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
                
                <plugin>
                    <groupId>org.mybatis.generator</groupId>
                    <artifactId>mybatis-generator-maven-plugin</artifactId>
                    <version>1.3.2</version>
                    <configuration>
                        <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                        <overwrite>true</overwrite>
                        <verbose>true</verbose>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    
    </project>

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：

注意application.yml 要放在resource的一级目录下，否则会找不到，报错。![1419013-20180907152808298-382657694.png][]

application.yml

server:
      port: 8080
    
    
    spring:
        datasource:
            name: mysql_test
            type: com.alibaba.druid.pool.DruidDataSource
            #druid相关配置
            druid:
              #监控统计拦截的filters
              filters: stat
              driver-class-name: com.mysql.jdbc.Driver
              #基本属性
              url: jdbc:mysql://127.0.0.1:3306/floor_shop
              username: root
              password: admin
              #配置初始化大小/最小/最大
              initial-size: 1
              min-idle: 1
              max-active: 20
              #获取连接等待超时时间
              max-wait: 60000
              #间隔多久进行一次检测，检测需要关闭的空闲连接
              time-between-eviction-runs-millis: 60000
              #一个连接在池中最小生存的时间
              min-evictable-idle-time-millis: 300000
              validation-query: SELECT 'x'
              test-while-idle: true
              test-on-borrow: false
              test-on-return: false
              #打开PSCache，并指定每个连接上PSCache的大小。oracle设为true，mysql设为false。分库分表较多推荐设置为false
              pool-prepared-statements: false
              max-pool-prepared-statement-per-connection-size: 20
    ## 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
    mybatis:
      mapper-locations: classpath:mapper/*.xml #注意：一定要对应mapper映射xml文件的所在路径
      type-aliases-package: com.springbootdemo3.sbmybatis.model  # 注意：对应实体类的路径
    
    #pagehelper
    pagehelper:
        helperDialect: mysql
        reasonable: true
        supportMethodsArguments: true
        params: count=countSql
        returnPageInfo: check

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

![1419013-20180907152548592-1524365759.png][]

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     
     7     <classPathEntry  location="F:\lib\mybatis\mysql-connector-java-5.1.11.jar"/>
     8     <context id="DB2Tables"  targetRuntime="MyBatis3">
     9         <commentGenerator>
    10             <property name="suppressDate" value="true"/>
    11             
    12             <property name="suppressAllComments" value="true"/>
    13         </commentGenerator>
    14         
    15         <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/floor_shop"
    16                         userId="root" password="admin">
    17         </jdbcConnection>
    18         <javaTypeResolver>
    19             <property name="forceBigDecimals" value="false"/>
    20         </javaTypeResolver>
    21         
    22         <javaModelGenerator targetPackage="com.denwgei.springbootmybatis.model" targetProject="src/main/java">
    23             <property name="enableSubPackages" value="true"/>
    24             <property name="trimStrings" value="true"/>
    25         </javaModelGenerator>
    26         
    27         <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
    28             <property name="enableSubPackages" value="true"/>
    29         </sqlMapGenerator>
    30         
    31         <javaClientGenerator type="XMLMAPPER" targetPackage="com.denwgei.springbootmybatis.Dao" targetProject="src/main/java">
    32             <property name="enableSubPackages" value="true"/>
    33         </javaClientGenerator>
    34         
    35         <table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false"
    36                enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    37     </context>
    38 </generatorConfiguration>

*  点击run-Edit Configurations

![1419013-20180907153202788-23709134.png][]

![1419013-20180907153449102-306506010.png][]

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

![1419013-20180907153609821-1695712303.png][]

最后生成的文件及结构：

![1419013-20180907154025189-599931982.png][]

UserMapper:

1 package com.denwgei.springbootmybatis.Dao;
     2 
     3 import com.denwgei.springbootmybatis.model.User;
     4 
     5 public interface UserMapper {
     6     int deleteByPrimaryKey(Integer id);
     7 
     8     int insert(User record);
     9 
    10     int insertSelective(User record);
    11 
    12     User selectByPrimaryKey(Integer id);
    13 
    14     int updateByPrimaryKeySelective(User record);
    15 
    16     int updateByPrimaryKey(User record);

//自己加的
        public List<User> queryAll();

17 }

User :

1 package com.denwgei.springbootmybatis.model;
     2 
     3 import java.util.Date;
     4 
     5 public class User {
     6     private Integer id;
     7 
     8     private Integer userId;
     9 
    10     private String userName;
    11 
    12     private String passWord;
    13 
    14     private String state;
    15 
    16     private String type;
    17 
    18     private Date updateTime;
    19 
    20     private Date createTime;
    21 
    22     public Integer getId() {
    23         return id;
    24     }
    25 
    26     public void setId(Integer id) {
    27         this.id = id;
    28     }
    29 
    30     public Integer getUserId() {
    31         return userId;
    32     }
    33 
    34     public void setUserId(Integer userId) {
    35         this.userId = userId;
    36     }
    37 
    38     public String getUserName() {
    39         return userName;
    40     }
    41 
    42     public void setUserName(String userName) {
    43         this.userName = userName == null ? null : userName.trim();
    44     }
    45 
    46     public String getPassWord() {
    47         return passWord;
    48     }
    49 
    50     public void setPassWord(String passWord) {
    51         this.passWord = passWord == null ? null : passWord.trim();
    52     }
    53 
    54     public String getState() {
    55         return state;
    56     }
    57 
    58     public void setState(String state) {
    59         this.state = state == null ? null : state.trim();
    60     }
    61 
    62     public String getType() {
    63         return type;
    64     }
    65 
    66     public void setType(String type) {
    67         this.type = type == null ? null : type.trim();
    68     }
    69 
    70     public Date getUpdateTime() {
    71         return updateTime;
    72     }
    73 
    74     public void setUpdateTime(Date updateTime) {
    75         this.updateTime = updateTime;
    76     }
    77 
    78     public Date getCreateTime() {
    79         return createTime;
    80     }
    81 
    82     public void setCreateTime(Date createTime) {
    83         this.createTime = createTime;
    84     }
    85 }

UserMapper.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="com.dengwei.day01springboot.dao.UserMapper" >
      <resultMap id="BaseResultMap" type="com.dengwei.day01springboot.model.User" >
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="user_id" property="userId" jdbcType="INTEGER" />
        <result column="user_name" property="userName" jdbcType="VARCHAR" />
        <result column="pass_word" property="passWord" jdbcType="VARCHAR" />
        <result column="state" property="state" jdbcType="VARCHAR" />
        <result column="type" property="type" jdbcType="VARCHAR" />
        <result column="update_time" property="updateTime" jdbcType="TIMESTAMP" />
        <result column="create_time" property="createTime" jdbcType="TIMESTAMP" />
      </resultMap>
      <sql id="Base_Column_List" >
        id, user_id, user_name, pass_word, state, type, update_time, create_time
      </sql>
      <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
        select 
        <include refid="Base_Column_List" />
        from user
        where id = #{id,jdbcType=INTEGER}
      </select>
      <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
        delete from user
        where id = #{id,jdbcType=INTEGER}
      </delete>
      <insert id="insert" parameterType="com.dengwei.day01springboot.model.User" >
        insert into user (id, user_id, user_name, 
          pass_word, state, type, 
          update_time, create_time)
        values (#{id,jdbcType=INTEGER}, #{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, 
          #{passWord,jdbcType=VARCHAR}, #{state,jdbcType=VARCHAR}, #{type,jdbcType=VARCHAR}, 
          #{updateTime,jdbcType=TIMESTAMP}, #{createTime,jdbcType=TIMESTAMP})
      </insert>
      <insert id="insertSelective" parameterType="com.dengwei.day01springboot.model.User" >
        insert into user
        <trim prefix="(" suffix=")" suffixOverrides="," >
          <if test="id != null" >
            id,
          </if>
          <if test="userId != null" >
            user_id,
          </if>
          <if test="userName != null" >
            user_name,
          </if>
          <if test="passWord != null" >
            pass_word,
          </if>
          <if test="state != null" >
            state,
          </if>
          <if test="type != null" >
            type,
          </if>
          <if test="updateTime != null" >
            update_time,
          </if>
          <if test="createTime != null" >
            create_time,
          </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides="," >
          <if test="id != null" >
            #{id,jdbcType=INTEGER},
          </if>
          <if test="userId != null" >
            #{userId,jdbcType=INTEGER},
          </if>
          <if test="userName != null" >
            #{userName,jdbcType=VARCHAR},
          </if>
          <if test="passWord != null" >
            #{passWord,jdbcType=VARCHAR},
          </if>
          <if test="state != null" >
            #{state,jdbcType=VARCHAR},
          </if>
          <if test="type != null" >
            #{type,jdbcType=VARCHAR},
          </if>
          <if test="updateTime != null" >
            #{updateTime,jdbcType=TIMESTAMP},
          </if>
          <if test="createTime != null" >
            #{createTime,jdbcType=TIMESTAMP},
          </if>
        </trim>
      </insert>
      <update id="updateByPrimaryKeySelective" parameterType="com.dengwei.day01springboot.model.User" >
        update user
        <set >
          <if test="userId != null" >
            user_id = #{userId,jdbcType=INTEGER},
          </if>
          <if test="userName != null" >
            user_name = #{userName,jdbcType=VARCHAR},
          </if>
          <if test="passWord != null" >
            pass_word = #{passWord,jdbcType=VARCHAR},
          </if>
          <if test="state != null" >
            state = #{state,jdbcType=VARCHAR},
          </if>
          <if test="type != null" >
            type = #{type,jdbcType=VARCHAR},
          </if>
          <if test="updateTime != null" >
            update_time = #{updateTime,jdbcType=TIMESTAMP},
          </if>
          <if test="createTime != null" >
            create_time = #{createTime,jdbcType=TIMESTAMP},
          </if>
        </set>
        where id = #{id,jdbcType=INTEGER}
      </update>
      <update id="updateByPrimaryKey" parameterType="com.dengwei.day01springboot.model.User" >
        update user
        set user_id = #{userId,jdbcType=INTEGER},
          user_name = #{userName,jdbcType=VARCHAR},
          pass_word = #{passWord,jdbcType=VARCHAR},
          state = #{state,jdbcType=VARCHAR},
          type = #{type,jdbcType=VARCHAR},
          update_time = #{updateTime,jdbcType=TIMESTAMP},
          create_time = #{createTime,jdbcType=TIMESTAMP}
        where id = #{id,jdbcType=INTEGER}
      </update>
    </mapper>

#### 项目启动类： ####

package com.denwgei.springbootmybatis;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    @MapperScan("com.denwgei.springbootmybatis.Dao")
    public class SpringbootmybatisApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SpringbootmybatisApplication.class, args);
        }
    }

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

新建service层 ：

IUserService :

1 package com.denwgei.springbootmybatis.service;
    2 
    3 import com.denwgei.springbootmybatis.model.User;
    4 import com.github.pagehelper.PageInfo;
    5 
    6 public interface IUserService {
    7     public PageInfo<User> queryAll(int pageNum, int pageSize);
    8 }

impl ：UserService :

1 package com.denwgei.springbootmybatis.service.impl;
     2 
     3 import com.denwgei.springbootmybatis.Dao.IUserMapper;
     4 import com.denwgei.springbootmybatis.model.User;
     5 import com.denwgei.springbootmybatis.service.IUserService;
     6 import com.github.pagehelper.PageHelper;
     7 import com.github.pagehelper.PageInfo;
     8 import org.springframework.beans.factory.annotation.Autowired;
     9 import org.springframework.stereotype.Service;
    10 
    11 import java.util.List;
    12 @Service
    13 public class UserService implements IUserService {
    14     @Autowired  //或则@Resource
    15     private IUserMapper userMapper;  //这里报错是正常的
    16 
    17     /*
    18      * 这个方法中用到了我们开头配置依赖的分页插件pagehelper
    19      * 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；
    20      * pageNum 开始页数
    21      * pageSize 每页显示的数据条数
    22      * */
    23     @Override
    24     public PageInfo<User> queryAll(int pageNum, int pageSize) {
    25         //将参数传给这个方法就可以实现物理分页了，非常简单。
    26         PageHelper.startPage(pageNum, pageSize);
    27         List<User> users = userMapper.queryAll();
    28         PageInfo result = new PageInfo(users);
    29         return result;
    30     }
    31 }

userController :

1 package com.denwgei.springbootmybatis.Controller;
     2 
     3 import com.denwgei.springbootmybatis.model.User;
     4 import com.denwgei.springbootmybatis.service.impl.UserService;
     5 import com.github.pagehelper.PageInfo;
     6 import org.springframework.beans.factory.annotation.Autowired;
     7 import org.springframework.stereotype.Controller;
     8 import org.springframework.web.bind.annotation.RequestMapping;
     9 import org.springframework.web.bind.annotation.ResponseBody;
    10 
    11 @Controller
    12 @RequestMapping("/user")
    13 public class UserController {
    14     @Autowired
    15 //    @Resource
    16     private UserService userService;
    17     @RequestMapping("/allUser")
    18     @ResponseBody
    19     public PageInfo<User> queryAllUser(){
    20         PageInfo<User> userPageInfo = userService.queryAll(1, 3);
    21         return userPageInfo;
    22     }
    23

启动springBoot的启动程序：

![1419013-20180907161355731-1849128795.png][]

启动成功：

![1419013-20180907161240053-189136447.png][]

好的，试试吧！！！！

转载于:https://www.cnblogs.com/dw3306/p/9605418.html

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