崛起于Springboot2.X + Mybatis-plus（62）

《SpringBoot2.X心法总纲》

项目Git地址：https://gitee.com/mdxl/blog.git

1、项目结构

2、pom依赖

      勾选web、jdbc、mysql、lombok依赖，然后添加其他依赖

<!--mybatis-plus配置依赖-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.2.0</version>
</dependency>
<!--mybatis-plus 代码生成器-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-generator</artifactId>
    <version>3.2.0</version>
</dependency>
<!--辅助 mybatis-plus 代码生成器前端模版引擎插件-->
<dependency>
    <groupId>org.freemarker</groupId>
    <artifactId>freemarker</artifactId>
    <version>2.3.29</version>
</dependency>

3、配置类

@EnableTransactionManagement
@Configuration
@MapperScan("com.mybatis.plus.service.*.mapper*")
public class MybatisPlusConfig {
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        return paginationInterceptor;
    }
}

4、启动类

添加注解，扫描mapper.java

@MapperScan("com.mybatis.plus.mapper")

5、Mapper

public interface UserMapper extends BaseMapper<UserEntity> {

    @Select({
            "select name from osc_user where id = 2 "
    })
    String kuozhan();

    String kuozhan2();
}

6、Service

public interface UserService extends IService<UserEntity> {

    String kuozhan();

    String kuozhan2();

    IPage<UserEntity> pageList(Page<UserEntity> page, LambdaQueryWrapper<UserEntity> queryWrapper);
}

7、ServiceImpl

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.mybatis.plus.entity.UserEntity;
import com.mybatis.plus.mapper.UserMapper;
import com.mybatis.plus.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, UserEntity> implements UserService {

    @Autowired
    UserMapper userMapper;

    /**
     * 自己额外扩展的service，用注解方式测试
     */
    @Override
    public String kuozhan() {
        return userMapper.kuozhan();
    }

    @Override
    public String kuozhan2() {
        return userMapper.kuozhan2();
    }

    @Override
    public IPage<UserEntity> pageList(Page<UserEntity> page, LambdaQueryWrapper<UserEntity> queryWrapper) {
        return userMapper.selectPage(page,queryWrapper);
    }
}

8、Controller

User1Controller使用的是Mybatis-plus自带提供方法

@RestController
@RequestMapping(value = "/useMapper")
@Slf4j
public class User1Controller {

    @Autowired
    UserMapper userMapper;
    @GetMapping(value = "/insertUser")
    public void insertUser(){
        userMapper.insert(new UserEntity("赵匡胤",21,"北京","篮球"));
    }
}

User2Controller使用的是自定义方法

@RequestMapping(value = "/userService")
@RestController
@Slf4j
public class User2Controller {

    @Autowired
    UserService userService;

    @GetMapping(value = "/save")
    public void save(){
        userService.save(new UserEntity("烙铁",22,"河北","乒乓球"));
    }

    @GetMapping(value = "/getOne")
    public void getOne(){
        // 使用lambda方式查询，当查询结果为多个报异常，false为查询其中的第一个
        UserEntity userEntity1 = userService.getOne(Wrappers.<UserEntity>lambdaQuery().eq(UserEntity::getAge,21),false);

        // 使用正常方式查询
        QueryWrapper<UserEntity> wrapper = Wrappers.query();
        wrapper.eq("age",21);
        UserEntity userEntity2 = userService.getOne(wrapper,false);

        log.info(userEntity1.toString());
        log.info(userEntity2.toString());
    }

    /**
     * 自定义扩展service
     */
    @GetMapping(value = "/getName")
    public void getName(){
        // 注解方式：自定义扩展service
        log.info(userService.kuozhan());
        // xml方式： 自定义扩展service
        log.info(userService.kuozhan2());
    }

    /**
     * 分页测试
     */
    @GetMapping(value = "/page")
    public void page(){
        Page<UserEntity> page = new Page<>(2,2);
        IPage<UserEntity> re = userService.pageList(page,Wrappers.<UserEntity>lambdaQuery());
        re.getRecords().stream().forEach(userEntity -> System.out.println(userEntity.getName()));
    }
}

9、实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
@TableName(value = "osc_user")
@ToString
public class UserEntity {
    // 主键,自增长
    @TableId(value = "id",type = IdType.AUTO)
    private int id;
    // 姓名
    private String name;
    // 年龄
    private int age;
    // 地址
    private String address;
    // 爱好
    private String hobby;

    public UserEntity(String name, int age, String address, String hobby) {
        this.name = name;
        this.age = age;
        this.address = address;
        this.hobby = hobby;
    }
}

10、代码生成接口

@RestController
public class CodeGenerator {

    @Value("${spring.datasource.url}")
    private String url;
    @Value("${spring.datasource.username}")
    private String username;
    @Value("${spring.datasource.password}")
    private String password;
    @Value("${spring.datasource.driver-class-name}")
    private String driverClassName;

    /**
     * @param tableName 输入表名，生成对应controller、service、mapper以及xml
     */
    @GetMapping(value = "/codeGenerator")
    public void codeGenerator(String tableName){
        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();
        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/src/main/java");
        gc.setAuthor("mujiutian");
        gc.setOpen(false);
        mpg.setGlobalConfig(gc);
        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl(url);
        dsc.setDriverName(driverClassName);
        dsc.setUsername(username);
        dsc.setPassword(password);
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("com.mybatis.plus");
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {}
        };

        // 使用模板引擎 freemarker
        String templatePath = "/templates/mapper.xml.ftl";
        // 自定义输出配置
        List<FileOutConfig> focList = new ArrayList<>();
        // 自定义配置会被优先输出
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
                return projectPath + "/src/main/resources/mapper/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();
        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);
        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(false);
        strategy.setInclude(tableName);
        strategy.setControllerMappingHyphenStyle(false);
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }
}

11、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.mybatis.plus.mapper.UserMapper">
    <select id="kuozhan2" resultType="java.lang.String">
        select name from osc_user where id = 2
    </select>

</mapper>

12、application.properties

# 端口
server.port=8085
# mysql 连接
spring.datasource.url=jdbc:mysql://localhost:3306/shiro?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#mybatis-plus
mybatis-plus.mapper-locations=classpath*:/mapper/*.xml
mybatis-plus.type-aliases-package=com.mybatis.plus.entity
mybatis-plus.configuration.map-underscore-to-camel-case= true

13、测试

分别都成功，然后代码生成器可能延迟几秒，但是也能成功！

 

来源：oschina

链接：https://my.oschina.net/mdxlcj/blog/3136357