初探mybatis-plus

 

添加依賴

<dependency>

   <groupId>com.baomidou</groupId>

   <artifactId>mybatis-plus</artifactId>

   <version>2.3</version>

</dependency>

配置掃描文件路徑: 

@MapperScan(value = {"com.baomidou.mybatisplus.samples.quickstart.mapper"})

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

    <property name="basePackage" value="com.baomidou.mybatisplus.samples.quickstart.springmvc.mapper"/>

</bean>

配置mapers文件加載路徑: 

mybatis-plus.mapper-locations=classpath*:mappers/*.xml

 通過XML文件配置屬性:

需要添加加載配置文件註解:@ContextConfiguration(locations = {"classpath*:config.xml"}) 以下是config.xml的內容:
<!-- H2 Data Source Config 可以是mysql、h2database等 -->
<bean id="dataSource" class="com.mysql.jdbc.jdbc2.optional.MysqlDataSource" >
<property name="databaseName" value=""/>
<property name="url" value=""/>
<property name="username" value=""/>
<property name="password" value=""/>
</bean>
<!-- SqlSessionFactory Config -->
<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="mapperLocations" value="classpath:mappers/*.xml"/>
	以下非必填配置
<property name="globalConfig" ref="globalConfig"/>
<property name="plugins">
<array>
<bean class="com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor"></bean>
</array>
</property>
</bean>
<bean id="globalConfig" class="com.baomidou.mybatisplus.core.config.GlobalConfig">
<property name="dbConfig" ref="dbConfig"/>
</bean>
<bean id="dbConfig" class="com.baomidou.mybatisplus.core.config.GlobalConfig.DbConfig">
<property name="keyGenerator" ref="keyGenerator"/>
</bean>
<bean id="keyGenerator" class="com.baomidou.mybatisplus.extension.incrementer.H2KeyGenerator"/>

簡單調用示例:

聲明Mapper

<mapper namespace="com.quickstart.mapper.UserMapper">

    <select id="selectMaxAge" resultType="java.lang.Integer">

        select max(age) from person

    </select>

</mapper>

@Mapper

public interface UserMapper extends BaseMapper<User> {Integer selectMaxAge();}

執行Mapper

@Resource

private UserMapper userMapper;

@Test

public void testSelect() {

    List<User> userList = userMapper.selectList(null);

    Integer integer = userMapper.selectMaxAge();

}

 

聲明Server

@Service

public interface UserServer extends IService<User> {List listAll();}

@Service

public class UserServerImpl extends ServiceImpl<UserMapper , User> implements UserServer {

    @Resource

    CustomMapper customMapper;

    @Override

    public List listAll() {

        return customMapper.selectList(null);

    }

}

執行Service

@Autowired

UserServer userServer;

public List test() {

    userServer.selectList(null);

    userServer.listAll();

}

代碼生成器簡介

MyBatis-Plus 從 3.0.3 之後移除了代碼生成器與模板引擎的默認依賴，需要手動添加相關依賴：添加 代碼生成器 依賴

<dependency>

    <groupId>com.baomidou</groupId>

    <artifactId>mybatis-plus-generator</artifactId>

    <version>3.3.1.tmp</version>

</dependency>

#Velocity（默認）

添加 模板引擎 依賴，MyBatis-Plus 支持 Velocity（默認）、Freemarker、Beetl，用戶可以選擇自己熟悉的模板引擎，如果都不滿足您的要求，可以採用自定義模板引擎。

<dependency>

    <groupId>org.apache.velocity</groupId>

    <artifactId>velocity-engine-core</artifactId>

    <version>2.2</version>

</dependency>

#Freemarker

<dependency>

    <groupId>org.freemarker</groupId>

    <artifactId>freemarker</artifactId>

    <version>2.3.30</version>

</dependency>

#Beetl

<dependency>

    <groupId>com.ibeetl</groupId>

    <artifactId>beetl</artifactId>

    <version>3.1.3.RELEASE</version>

</dependency>

 

// 代碼生成器

        AutoGenerator mpg = new AutoGenerator();

        // 全局配置

        GlobalConfig gc = new GlobalConfig();

        //當前文件夾

        String projectPath = System.getProperty("user.dir");

        gc.setOutputDir(projectPath + "/mybatis-plus-sample-generator/src/main/java");

        gc.setAuthor("Arnold");

//        實體類是否添加Swagger2註解

//        gc.setSwagger2(true);

        gc.setOpen(false);

        //默認不覆蓋，如果文件存在，將不會再生成，配置true就是覆蓋

        gc.setFileOverride(true);

        mpg.setGlobalConfig(gc);

        // 數據源配置

        DataSourceConfig dsc = new DataSourceConfig();

        dsc.setUrl("jdbc:mysql://localhost:3306/activity?characterEncoding=utf8&serverTimezone=UTC");

        dsc.setDriverName("com.mysql.jdbc.Driver");

        dsc.setUsername("root");

        dsc.setPassword("root");

        mpg.setDataSource(dsc);

        // 包配置

        PackageConfig pc = new PackageConfig();

        pc.setModuleName(scanner("模塊名"));

        pc.setParent("com.baomidou.mybatisplus.samples.generator");

        mpg.setPackageInfo(pc);

        // 自定義屬性注入

        InjectionConfig cfg = new InjectionConfig() {

             @Override public void initMap() { // to do nothing}

        };

        List<FileOutConfig> focList = new ArrayList<>();

        focList.add(new FileOutConfig("/templates/mapper.xml.ftl") {

            @Override public String outputFile(TableInfo tableInfo) {

                // 自定義輸入文件名稱

                return projectPath + "/mybatis-plus-sample-generator/src/main/resources/mapper/" + pc.getModuleName()

                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;

       } });

        cfg.setFileOutConfigList(focList);

        mpg.setCfg(cfg);

        mpg.setTemplate(new TemplateConfig().setXml(null));

        // 策略配置

        StrategyConfig strategy = new StrategyConfig();

        strategy.setNaming(NamingStrategy.underline_to_camel);

        strategy.setColumnNaming(NamingStrategy.underline_to_camel);

//        strategy.setSuperEntityClass("com.xxx.BaseEntity") 實體類的父類沒有則不寫;

        strategy.setEntityLombokModel(true);

//        strategy.setSuperControllerClass("com.xxx.BaseController")Controller的父類沒有則不寫;

        strategy.setInclude(scanner("表名"));

        strategy.setSuperEntityColumns("id");

        strategy.setControllerMappingHyphenStyle(true);

        strategy.setTablePrefix(pc.getModuleName() + "_");

        mpg.setStrategy(strategy);

        // 選擇 freemarker 引擎需要指定如下加，注意 pom 依賴必須有！

        mpg.setTemplateEngine(new FreemarkerTemplateEngine());

        mpg.execute();

public static String scanner(String tip) {

    Scanner scanner = new Scanner(System.in);

    StringBuilder help = new StringBuilder();

    help.append("請輸入" + tip + "：");

    System.out.println(help.toString());

    if (scanner.hasNext()) {

        String ipt = scanner.next();

        if (StringUtils.isNotEmpty(ipt)) {

            return ipt;

        }

    }

    throw new MybatisPlusException("請輸入正確的" + tip + "！");

}