这两天学习了SpringBoot 与 Mybatis的整合 自己总结记录一下

1.创建一个空的SpringBoot项目,添加依赖:

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!--Web支持-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.1.1.RELEASE</version>
        </dependency>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <!--mybatis-springboot整合-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!--Mapper自动生成的generator-->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!--pagehelper-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-autoconfigure</artifactId>
            <version>1.2.3</version>
        </dependency>

2.添加逆向工程插件:

<!-- mybatis逆向工程插件 -->
     <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>1.3.5</version>
          <configuration>
              <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
              <verbose>true</verbose>
              <overwrite>true</overwrite>
          </configuration>
          <dependencies>
               <dependency>
                   <groupId>mysql</groupId>
                   <artifactId>mysql-connector-java</artifactId>
                   <version>5.1.46</version>
               </dependency>
          </dependencies>
     </plugin>

3. 第2步骤中的插件配置需要resources目录下的generatorConfig.xml文件支持,该配置文件针对数据库中的表数据和要生成的实体类进行映射,下面贴出xml文件:

<?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">
<!-- 配置生成器 -->
<generatorConfiguration>
    <!--执行generator插件生成文件的命令: call mvn mybatis-generator:generate -e -->
    <!--classPathEntry:数据库的JDBC驱动,换成你自己的驱动位置 可选 -->
    <classPathEntry location="C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.46\mysql-connector-java-5.1.46.jar" />
    <!-- 一个数据库一个context -->
    <!--defaultModelType="flat" 大数据字段,不分表 -->
    <context id="MysqlTables" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <!-- 自动识别数据库关键字,默认false,如果设置为true,根据SqlReservedWords中定义的关键字列表;
        一般保留默认值,遇到数据库关键字(Java关键字),使用columnOverride覆盖 -->
        <property name="autoDelimitKeywords" value="true" />
        <!-- 生成的Java文件的编码 -->
        <property name="javaFileEncoding" value="utf-8" />
        <!-- beginningDelimiter和endingDelimiter:指明数据库的用于标记数据库对象名的符号,比如ORACLE就是双引号,MYSQL默认是`反引号; -->
        <property name="beginningDelimiter" value="`" />
        <property name="endingDelimiter" value="`" />
        <!-- 格式化java代码 -->
        <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter"/>
        <!-- 格式化XML代码 -->
        <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/>
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
        <plugin type="org.mybatis.generator.plugins.ToStringPlugin" />
        <!-- 注释 -->
        <commentGenerator >
            <property name="suppressAllComments" value="false"/><!-- 是否取消注释 -->
            <property name="suppressDate" value="true" /> <!-- 是否生成注释代时间戳-->
        </commentGenerator>
        <!-- jdbc连接 这边换成自己的数据库和账户密码-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/dbgirl?characterEncoding=utf8"
                        userId="root"
                        password="123" />
        <!-- 类型转换 -->
        <javaTypeResolver>
            <!-- 是否使用bigDecimal, false可自动转化以下类型(Long, Integer, Short, etc.) -->
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成实体类地址 -->
        <javaModelGenerator targetPackage="pojo" targetProject="src/main/java/mybatisspringboot" >
            <property name="enableSubPackages" value="false"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成mapxml文件 -->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources" >
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <!-- 生成mapxml对应client,也就是接口dao -->
        <javaClientGenerator targetPackage="mapper" targetProject="src/main/java/mybatisspringboot" type="XMLMAPPER" >
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>
        <!-- table可以有多个,每个数据库中的表都可以写一个table,tableName表示要匹配的数据库表,也可以在tableName属性中通过使用%通配符来匹配所有数据库表,只有匹配的表才会自动生成文件 -->
        <table tableName="user" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true">
            <!--enableCountByExample="true" enableUpdateByExample="true"
            enableDeleteByExample="true" enableSelectByExample="true"
            selectByExampleQueryId="true" 这些参数配置是取消生成Example有关的Mapper代码可以自己选择-->
        </table>
    </context>
</generatorConfiguration>

4.IDEA编译器 选择Run->Run Configurations 增加Maven编译命令,选择你的Working direcroy 输入命令:

mybatis-generator:generate   保存后执行即可自动生成Mapper接口和文件。

5.接口文件生成好之后下面贴入application.properties配置  和pagehelper的配置:

application.properties:

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.url=jdbc:mysql://localhost:3306/dbgirl?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&useSSL=false 
spring.datasource.password=root 

########## Mybatis 自身配置 ##########
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.type-aliases-package=mybatisspringboot.pojo

启动类中或自几定义的配置类中加入PageHelper配置实例:楼主这里用的是PageHelper 5.1.2与4.x版本不一样,org.apache.ibatis.plugin.Interceptor接口的实现改变了

@Bean
    public PageInterceptor getPageInterceptor(){ 
        PageInterceptor interceptor=new PageInterceptor();
        Properties properties=new Properties();
        properties.setProperty("helperDialect","mysql");
        properties.setProperty("reasonable","true");
        properties.setProperty("supportMethodsArguments","true");
        properties.setProperty("params","count=countSql");
        interceptor.setProperties(properties);
        return interceptor;
    }

6.下面贴出演示代码,为了测试整合,没有什么业务逻辑,所以省掉了Service层,

Controller层:

package mybatisspringboot.controller;

import com.github.pagehelper.PageHelper;
import mybatisspringboot.mapper.UserMapper;
import mybatisspringboot.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserMapper userMapper;
    @GetMapping("/findUserByPage")
    public List<User> findUserByPage(@RequestParam(name = "pageNum") int pageNum,
                                     @RequestParam(name = "pageSize") int pageSize){
        PageHelper.startPage(pageNum,pageSize);
        List<User> list = userMapper.selectAll();
        return  list;

    }
}

 启动类要加上@MapperScan注解扫描Mapper接口,或者在接口上加上@Mapper注解即可,启动程序地址栏输入:localhost:8080/user/findUserByPage?pageNum=1&pageSize=2即可看到分页效果,如果测试分页是否可用可以把PageHelper.startPage(pageNum,pageSize)行注释掉再看效果。