Spirngboot+Spring Data mongodb(一) 环境搭建

        org.springframework.boot
        spring-boot-starter-parent
        2.3.8.RELEASE
    

    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-data-mongodb
        
        
            org.projectlombok
            lombok
            true
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            com.alibaba
            fastjson
            1.2.75
        
    

server:
  port: 8081

spring:
  data:
    mongodb:
      host: 192.168.70.149
      port: 27017
      database: dev
      ## 开启自动驼峰命名，低于 @Feild优先级
      field-naming-strategy: org.springframework.data.mapping.model.SnakeCaseFieldNamingStrategy

## 打印nosql日志
logging:
  level:
    org:
      springframework:
        data:
          mongodb:
            core: debug

添加java配置类

@Configuration
public class MongoConfig {
    
    @Bean
    public MappingMongoConverter mappingMongoConverter(MongoDatabaseFactory mongoDbFactory, MongoMappingContext mongoMappingContext) {
        DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory);
        MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mongoMappingContext);
        converter.setTypeMapper(new DefaultMongoTypeMapper(null));
        return converter;
    }

import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.Data;
import org.springframework.data.mongodb.core.mapping.document;
import org.springframework.data.mongodb.core.mapping.Field;

import java.time.LocalDateTime;
import java.util.List;

@document("bill")
@Data
@JsonInclude(JsonInclude.Include.NON_NULL)
public class BillDetail {

    private String id;

    private String billNo;

    private String province;

    private String city;

    private String county;

    private LocalDateTime createdTime;

    private Integer price;

    private String username;

    private String sex;

    @Field("productInfos")
    private List productInfos;
}

注意，实体对象的基本类型 一定要用包装类型，用Integer 而 不用Int，原因Integer默认值为Null，Int默认值0，新增对象时若不显式复制，int类型price会默认插入0，而Integer类型时，不会插入。

        BillDetail billDetail = new BillDetail();
        String suffix = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmssSSSSS"));
        billDetail.setBillNo("0304"+ suffix);
        billDetail.setCity("深圳市");
        billDetail.setProvince("广东省");
        BillDetail insert = mongoTemplate.insert(billDetail);
        String id = insert.getId();
        log.info("插入文档返回id:{}",id);

 当price类型为Int时，本次执行效果

{ _id: ObjectId("616e85fd4d87d14b28004360"),
  bill_no: '03042021101916465376100',
  province: '广东省',
  city: '深圳市',
  price: 0,
  sex: 0,
  _class: 'com.vm.data.entity.BillDetail' }

当price类型为Int时，本次执行效果

{ _id: ObjectId("616e8eafb592682589d63af8"),
  bill_no: '03042021101917235899000',
  province: '广东省',
  city: '深圳市',
  _class: 'com.vm.data.entity.BillDetail' }