Spring-Boot学习（3）之集成mybatis及自动生成代码插件（基于IntellijIDEA）

项目需要连接数据库，集成目前流行的mybatis。在上篇博客项目的基础上去集成。

这东西在学习的时候，各种报错，功夫不负有心人最后还是集成了！接下来进入正题。

1.先删掉项目中resources下的application.propties文件，并新建application.yml文件，文件中写入如下配置：

server:
  port: 8080
  servlet:
    context-path: /

spring:
  mvc:
    view:
      prefix: /
      suffix: .html
  datasource:
    url: jdbc:mysql://47.105.163.133:3306/test
    username: root
    password: Some_Pass1
    # 使用druid数据源
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver


## 该配置节点为独立的节点，不是在在spring的节点下
mybatis:
  mapper-locations: classpath:mapping/*.xml  #注意：一定要对应mapper映射xml文件的所在路径
  type-aliases-package: com.sid.model  # 注意：对应实体类的路径
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #控制台打印sql

#pagehelper分页插件
pagehelper:
  helperDialect: mysql
  reasonable: true
  supportMethodsArguments: true
  params: count=countSql

在该目录下新建文件夹generator,在该文件夹下新建generatorConfig.xml文件,写入如下内容：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
    <classPathEntry  location="C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.39\mysql-connector-java-5.1.39.jar"/>
    <context id="context"  targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库链接URL，用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://47.105.163.133:3306/test" userId="root" password="Some_Pass1">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成模型的包名和位置-->
        <javaModelGenerator targetPackage="com.example.springboot.pojo" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置-->
        <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources/mapper">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.example.springboot.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
        <table tableName="users" domainObjectName="Users" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

2.在Pom文件中集成mybatis,连接池，分页工具，代码自动生成工具：

<?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>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.1.3.RELEASE</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.example</groupId>
   <artifactId>spring-boot</artifactId>
   <version>0.0.1</version>
   <name>spring-boot</name>
   <description>Demo project for Spring Boot</description>

   <properties>
      <java.version>1.8</java.version>
      <docker.image.prefix>springboot</docker.image.prefix>
   </properties>

   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter</artifactId>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </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>
         <version>5.1.38</version>
      </dependency>

      <!-- alibaba的druid数据库连接池 -->
      <dependency>
         <groupId>com.alibaba</groupId>
         <artifactId>druid-spring-boot-starter</artifactId>
         <version>1.1.9</version>
      </dependency>

      <!-- mybatis分页插件 -->
      <dependency>
         <groupId>com.github.pagehelper</groupId>
         <artifactId>pagehelper-spring-boot-starter</artifactId>
         <version>1.2.5</version>
      </dependency>

   </dependencies>

   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
         <!-- Docker maven plugin -->
         <plugin>
            <groupId>com.spotify</groupId>
            <artifactId>docker-maven-plugin</artifactId>
            <version>1.0.0</version>
            <configuration>
               <imageName>${docker.image.prefix}/${project.artifactId}</imageName>
               <dockerDirectory>src/main/docker</dockerDirectory>
               <resources>
                  <resource>
                     <targetPath>/</targetPath>
                     <directory>${project.build.directory}</directory>
                     <include>${project.build.finalName}.jar</include>
                  </resource>
               </resources>
            </configuration>
         </plugin>
         <!-- Docker maven plugin -->
         <!-- mybatis generator 自动生成代码插件 -->
         <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>

红色部分为添加内容。项目结构如下图：

注意：修改Application.java文件，添加红色部分代码

package com.example.springboot;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.example.mapper")
public class Application {

   public static void main(String[] args) {

      SpringApplication.run(Application.class, args);
   }

}

3.执行代码自动生成工具。

选择这个点击

找到maven,创建

运行如下图的组件，就会自动生成代码了：

接下来你可以写一些简单的业务。