SpringBoot之整合MyBatis

　　今天了解一下SpringBoot如何与我们最常用的ORM框架Mybatis整合。

一、

　　需要在pom.xml文件里加入mybatis的依赖

<dependency>    <groupId>org.mybatis.spring.boot</groupId>    <artifactId>mybatis-spring-boot-starter</artifactId>    <version>1.3.2</version></dependency>

二、

　　需要在application.properties文件里加关于mybatis的配置

#mybatis配置mybatis.mapper-locations=classpath:mapper/*.xml      ------意思是mapper文件在classpath下的mapper里mybatis.type-aliases-package=com.renruibin.springbootmybatis.pojo    -------设置自定义的Pojo别名为首写字母小写的pojo

#数据源配置spring.datasource.url=jdbc:mysql://localhost:3306/springbootmybatisspring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.username=rootspring.datasource.password=rrb

三、

　　使用Ant，达到自动创建默认的Mybatis代码和生成表，需要添加以下文件，目录结构为：

1、user.xml，这是要自动生成代码的一些配置　

<?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>   <context id="user">      <jdbcConnection driverClass="${database.driver}"         connectionURL="${database.url}" userId="${database.username}"         password="${database.password}" />      <javaModelGenerator targetPackage="com.renruibin.springbootmybatis.pojo"         targetProject="${targetProject}" />      <sqlMapGenerator targetPackage="mapper"         targetProject="${targetProjRsrc}" />      <javaClientGenerator targetPackage="com.renruibin.springbootmybatis.dao"         targetProject="${targetProject}" type="XMLMAPPER" />        <table tableName="user" domainObjectName="User">        </table>   </context></generatorConfiguration>

javaModelGenerator：配置自动生成的pojo所在的位置

sqlMapGenerator：配置自动生成的mapper.xml文件所在的位置

javaClientGenerator：配置自动生成的mapper.java文件所在的位置

2、changleLog.xml，这是要自动生成表或者修改表结构的一些配置

<?xml version="1.0" encoding="UTF-8" standalone="no"?><databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd">   <changeSet id="20190113" author="rrb">      <createTable tableName="user" remarks="用户版">         <column name="id" type="varchar(32)">            <constraints nullable="false" primaryKey="true" />         </column>         <column name="username" remarks="用户名" type="varchar(50)" />         <column name="password" remarks="密码" type="varchar(50)" />         <column name="status" remarks="状态" type="int" />         <column name="createtime" remarks="创建时间" type="TIMESTAMP" />         <column name="edittime" remarks="修改时间" type="TIMESTAMP" />      </createTable>   </changeSet>   <changeSet id="20190113-2" author="rrb">      <dropColumn tableName="user" columnName="createtime"></dropColumn>      <dropColumn tableName="user" columnName="edittime"></dropColumn>   </changeSet></databaseChangeLog>

3、database.properties，这是数据源的一些配置

database.driver=com.mysql.jdbc.Driverdatabase.url=jdbc\:mysql\://127.0.0.1\:3306/springbootmybatis?useUnicode\=true&characterEncoding\=UTF-8database.username=rootdatabase.password=rrb

4、update&mybatis.xml，这是ant自动生成代码的配置

<project name="updateDatabase" default="mybatis">   <property file="database.properties">   </property>   <property name="targetProject" location="..\src\main\java">   </property>   <property name="targetProjRsrc" location="..\src\main\resources">   </property>   <path id="jdbclib">      <fileset dir="${basedir}\lib" includes="mysql-connector-java-5.1.23-bin.jar" />   </path>   <target name="mybatis" description="Generate the files">      <taskdef name="mbgenerator" classname="org.mybatis.generator.ant.GeneratorAntTask">         <classpath>            <pathelement location="${basedir}\lib\mybatis-generator-core-1.3.2.jar" />            <pathelement location="${basedir}\lib\generator-0.0.1-SNAPSHOT.jar" />            <pathelement location="${basedir}\lib\mysql-connector-java-5.1.23-bin.jar" />         </classpath>      </taskdef>      <mbgenerator overwrite="true" configfile="generator/user.xml"         verbose="true">         <propertyset>            <propertyref name="database.driver" />            <propertyref name="database.url" />            <propertyref name="database.username" />            <propertyref name="database.password" />            <propertyref name="targetProject" />            <propertyref name="targetProjRsrc" />         </propertyset>      </mbgenerator>   </target></project>

5、updateDatabase.xml，这是ant自动生成表的配置<project name="updateDatabase" default="updateDatabase">

   <property file="database.properties">   </property>   <path id="jdbclib">      <fileset dir="${basedir}\lib" includes="mysql-connector-java-5.1.23-bin.jar" />   </path>   <target name="updateDatabase">      <fail unless="database.url">database.url not set</fail>      <fail unless="database.username">database.username not set</fail>      <fail unless="database.password">database.password not set</fail>      <taskdef resource="liquibasetasks.properties">         <classpath>            <pathelement location="${basedir}\lib\snakeyaml-1.13.jar" />            <pathelement location="${basedir}\lib\liquibase.jar" />         </classpath>      </taskdef>       <updateDatabase               changeLogFile="${basedir}\changeLog.xml"               driver="${database.driver}"               url="${database.url}"               username="${database.username}"               password="${database.password}"               promptOnNonLocalDatabase="false"               dropFirst="false"               classpathref="jdbclib"              loglevel="info"       />   </target></project>

四、

　　建立dao、service、controller，目录如下：

1、先看一下dao层的代码是如何编写的吧

@Mapperpublic interface UserAtomMapper {    List<User> finaAll();}@Mapper这个注解很关键，之前用的@Repository注解，但是与springboot整合之后，这个注解就不能用了，只有@Mapper注解的时候，才可以把这个类注入到service里。

2、看一下mapper层的xml文件是如何编写的

<?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.renruibin.springbootmybatis.dao.UserAtomMapper">    <select id="finaAll" resultType="com.renruibin.springbootmybatis.pojo.User">        select * from user    </select></mapper>

3、看一下service层的代码

@Servicepublic class UserServiceImpl implements UserService {

@Autowired    private UserAtomMapper userAtomMapper;

@Override    public List<User> findAll() {        return userAtomMapper.finaAll();    }

4、看一下controller层的代码

@RestControllerpublic class UserController {    @Autowired    private UserService userService;    /**     * 获取所有的用户     * @return     */    @RequestMapping(value = "findAll",method = RequestMethod.GET)    public List<User> findAll(){        return userService.findAll();    }}使用了注解@RestController，这个注解相当于两个注解，@Controller和@ResponseBody

五、

　　接下来可以测试，在浏览器输入localhost:8080/findAll

原文地址：https://www.cnblogs.com/rrb520/p/10265745.html