springboot集成

1.springboot集成mybatis-plus

1.1添加数据库驱动依赖和mybatis-plus依赖

<!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.0</version>
        </dependency>

添加lombok依赖，简化开发，不是必须的

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

 

1.2 配置mybatis-plus（数据库连接配置）

datasource:
    url: jdbc:mysql://localhost:3306/time?useUnicode=true&characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=GMT%2B8
    username: root
    password:
    driver-class-name: com.mysql.cj.jdbc.Driver

1.3 集成Swagger

导入依赖：springfox-swagger2；springfox-swagger-ui

<!--swagger-->
        <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.0</version>
        </dependency>

 编写SwaggerConfig配置类：

@Configuration  //配置类
@EnableSwagger2   //开启Swagger2
public class SwaggerConfig {
    //配置Swagger的docket的bean实例
    @Bean
    public Docket ccaApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("task")
                .genericModelSubstitutes(DeferredResult.class)
                .useDefaultResponseMessages(false)
                .forCodeGeneration(true)
                //过滤路径
                .pathMapping("/")
                .select()
                //扫描包名
                .apis(RequestHandlerSelectors.basePackage("com.example.demo.controller"))
                .build()
                .apiInfo(taskApiInfo());
    }

    private ApiInfo taskApiInfo() {
        return new ApiInfoBuilder()
                .title("测试服务接口列表")//大标题
                .version("1.0")//版本
                .build();}
}

访问路径：http://localhost:8081/swagger-ui.html

http://localhost:8080/doc.html#/home  (knife4j)

1.4 配置mybatis-plus 日志

 

在yml文件中配置

mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

1.5  集成自动填充：

 同步实体类：

@TableField(fill = FieldFill.INSERT)
    private LocalDateTime gmtCreat;

    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime gmtModified;

 编写处理类：MyMetaObjectHandler

@Slf4j
@Component//把处理器加入到IOC容器中
public class MyMetaObjectHandler implements MetaObjectHandler {
    //插入时的填充策略
    @Override
    public void insertFill(MetaObject metaObject) {
        log.info("start insert fill...");
        this.strictInsertFill(metaObject, "gmtCreat", LocalDateTime.class, LocalDateTime.now());
        this.strictUpdateFill(metaObject, "gmtModified", LocalDateTime.class, LocalDateTime.now());
    }
    //更新时的填充策略
    @Override
    public void updateFill(MetaObject metaObject) {
        log.info("start update fill...");
        this.strictUpdateFill(metaObject, "gmtModified", LocalDateTime.class, LocalDateTime.now());
    }
}

1.6 乐观锁

同步实体类：

@Version
    private Integer version;

编写配置类：MyBatisPlusConfig

注册组件：//新版本弃用，直接加@version就可以使用乐观锁

1.7分页查询

导入分页插件

 @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        // 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求  默认false
        // paginationInterceptor.setOverflow(false);
        // 设置最大单页限制数量，默认 500 条，-1 不受限制
        // paginationInterceptor.setLimit(500);
        // 开启 count 的 join 优化,只针对部分 left join
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
        return paginationInterceptor;
    }

使用Page对象

 1.8 逻辑删除：

1 同步实体类

@TableLogic
    private Integer deleted;

2 逻辑删除配置

mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  global-config:
    db-config:
      logic-delete-field: flag  # 全局逻辑删除的实体字段名(since 3.3.0,配置后可以忽略不配置步骤2即在字段添加@TableLogic注解)
      logic-delete-value: 1 # 逻辑已删除值(默认为 1)
      logic-not-delete-value: 0 # 逻辑未删除值(默认为 0)