spring boot 整合 mongodb springboot整合mangodb

1.引入maven 依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
2.在application.yml进行连接信息配置
srpring:    
  data:
    mongodb:
      uri: mongodb://yangxiaohui:Yangxiaohui227@106.52.85.248:27017/shopdb?maxPoolSize=256        -- 注释:uri的格式:mongodb://username:password@IP:port/database?maxPoolSize=256

 3.mysql中的一张表,在mysql数据库中会有一个实体(entiy/pojo/domain)跟其对应,同理mango中的collection(表) 也会有一个实体跟其对应:

//创建一个order表如下:

@Document(collection = "order")  //贴有该注解的字符会被映射为对应的集合名字

public class ShopMongoOrder {
@Id   //贴有Id注解,生成mongodb的collection对象后,被贴注解的字段就是唯一主键,不能重复
    private String orderId;

    private String orderTitle;

    private BigDecimal orderTotalAmount;

    private BigDecimal orderPayAmount;

    private String createTime;

    private String finishTime;

    private String deliveryTime;
    @Indexed(unique = false) //索引的创建
    private  Integer orderStatus;
    @Field(value ="paymentStatus" )  //如果没添加这个注解的话,在mongodb中使用的是payStatus字段名称
    private Integer payStatus;

    private String customerId;

    /**
     * 日期格式如果不想用String类型表示,可以用下面的格式化方式
     * @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
       private Date updateTime;//最新浏览时间
     *
     *
     */

    public String getCustomerId() {
return customerId;
    }

public void setCustomerId(String customerId) {
this.customerId = customerId;
    }

public String getOrderId() {
return orderId;
    }

public void setOrderId(String orderId) {
this.orderId = orderId;
    }

public String getOrderTitle() {
return orderTitle;
    }

public void setOrderTitle(String orderTitle) {
this.orderTitle = orderTitle;
    }

public BigDecimal getOrderTotalAmount() {
return orderTotalAmount;
    }

public void setOrderTotalAmount(BigDecimal orderTotalAmount) {
this.orderTotalAmount = orderTotalAmount;
    }

public BigDecimal getOrderPayAmount() {
return orderPayAmount;
    }

public void setOrderPayAmount(BigDecimal orderPayAmount) {
this.orderPayAmount = orderPayAmount;
    }

public String getCreateTime() {
return createTime;
    }

public void setCreateTime(String createTime) {
this.createTime = createTime;
    }

public String getFinishTime() {
return finishTime;
    }

public void setFinishTime(String finishTime) {
this.finishTime = finishTime;
    }

public String getDeliveryTime() {
return deliveryTime;
    }

public void setDeliveryTime(String deliveryTime) {
this.deliveryTime = deliveryTime;
    }

public Integer getOrderStatus() {
return orderStatus;
    }

public void setOrderStatus(Integer orderStatus) {
this.orderStatus = orderStatus;
    }

public Integer getPayStatus() {
return payStatus;
    }

public void setPayStatus(Integer payStatus) {
this.payStatus = payStatus;
    }
}

//单条插入

@Service
public class MangodbService {
    @Autowired
    private MongoTemplate mongoTemplate;
    @Autowired
    private ShopOrderMastMapper orderMastMapper;
    //新增
    public void insertOrder(String orderId){
        ShopMongoOrder shopMongoOrder = orderMastMapper.selectMongoOrderByOrderId(orderId);
        if(null!=shopMongoOrder){
            mongoTemplate.insert(shopMongoOrder); //调用的是insert(T objectToSave)该方法,因为T是实体类,通过注解就知道查到哪个collection了,mango不像mysql一样需要先创建表,它不用,第一条插入的数据,发现没有对应的collection就会创建
        }
    }
}

//插入第一条数据后:

重复插入后会报错:

//批量新增

//批量插入
    public void insertAll(){
        List<ShopMongoOrder> shopMongoOrders = orderMastMapper.selectOrderList();
        Collection<ShopMongoOrder> mongoOrders = mongoTemplate.insertAll(shopMongoOrders);
        return ;
    }

//删除单条数据

//删除单条
    public void deleteByOrderId(String orderId){
        ShopMongoOrder shopMongoOrder = orderMastMapper.selectMongoOrderByOrderId(orderId);
        mongoTemplate.remove(shopMongoOrder);
    }

//根据条件删除数据

public void deleteByOrderId(String orderId){
        Criteria c = Criteria.where("orderId").is(orderId); //相当于mysql的where orderId="ddd"
        Query query = new Query(c);
        DeleteResult ret = mongoTemplate.remove(query,ShopMongoOrder.class);
    }

 //单条修改

//更新订单
    public void updateByOrderId(String orderId){
       //使用updateFirst(Query query, Update update, Class<?> entityClass)该方法,updateFirst和update方法的区别是:updateFirst只更改查询到的第一条,update是更改所有满足条件的
        //new Update().set("orderTitle", "iphone").set("a","b") 可以使用链式表达式
        UpdateResult updateResult = mongoTemplate.updateFirst(new Query(Criteria.where("orderId").is(orderId)), new Update().set("orderTitle", "iphone"), ShopMongoOrder.class);
      
    }

//查找单条数据

//查找
    public ShopMongoOrder selectOrderId(String orderId){
        //findOne(Query query, Class<T> entityClass)
        ShopMongoOrder mongoOrder = mongoTemplate.findOne(new Query(Criteria.where("orderId").is(orderId)), ShopMongoOrder.class);
        return mongoOrder;
    }

 

//高级查询: 排序 分页 
 public List<ShopMongoOrder> getList(){
        Query query = new Query();
        Criteria criteria =new Criteria();

        //下面条件相当于select * from order where orderStatus in(16,32) and payStatus=4 and finishTime<=2019-07-05 00:00:00 and (customerId=139 or customerId=1360)
        criteria.and("orderStatus").in(16, 32).andOperator(Criteria.where("payStatus").is(4)).and("finishTime").lte("2019-07-05 00:00:00")
               .orOperator(Criteria.where("customerId").is("139"),Criteria.where("customerId").is("1360"));

        //1360
        query.addCriteria(criteria);
        System.out.println(JSON.toJSONString(criteria));
        long count = mongoTemplate.count(query, ShopMongoOrder.class); //计算总数,用于算法分页数
        System.out.println(count);


        int pageNum=1;
        int pageSize=20;
        int pageTotal=(int) (count%pageSize==0?count/pageSize:count/pageSize+1); //总页数
        System.out.println(pageTotal);
        int offset=(pageNum-1)*pageSize;
        query.with(Sort.by(Sort.Order.desc("deliveryTime"))); //排序逻辑
        query.skip(offset).limit(pageSize); // 分页逻辑
        List<ShopMongoOrder> shopMongoOrders = mongoTemplate.find(query, ShopMongoOrder.class);

//List<String> customerId = mongoTemplate.findDistinct(query, "customerId", ShopMongoOrder.class, String.class); //查询用户编号,去重

return shopMongoOrders;
 }

 //聚合操作

public void aggress(){
        //java的bigDeciaml类型在mongodb中会变成字符串,所以对bigDeciaml进行sum操作,永远都是返回0
        //match是条件:match在group后面就相当于where 语句,在后面相当于having语句,sort要在group后面才有意义
        Aggregation aggregation = Aggregation.newAggregation(
                Aggregation.group("orderStatus").count().as("total")
                        .sum("orderPayAmount").as("payAmount")
                        .first("orderStatus").as("orderStatus")

        ).withOptions(Aggregation.newAggregationOptions().allowDiskUse(true).build());
        //如果不加first的时候,取不到orderStatus的值,所以加了后,分组的值才会有数据
        //Aggregation.newAggregationOptions().allowDiskUse(true)是用来解除mongodb 查询数据默认占用最大内存的(默认100M).不然会抛出异常:
        AggregationResults<OrderComputeInfo> order = mongoTemplate.aggregate(aggregation, "order", OrderComputeInfo.class);
        List<OrderComputeInfo> mappedResults = order.getMappedResults();
        System.out.println(mappedResults);
        System.out.println(order);


    }