Mongosh查询概要

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前言

提示：这里可以添加本文要记录的大概内容：

例如：

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提示：增删改查的模板

1. createOperation
   db.collectionName.insertOne({ a document })
2. readOperation
   db.collectionName.find({query critera},{projection})
3. updateOperation
   db.collectionName.updateMany({update filter},{update action})
4. deleteOperation
   db.collectionName.deleteMany({delete filter})

1.查询

1. 查询所有

2. 指定相等条件

   # {query critera}
   {<filed1>:<value1>,..}
   

3. 使用QueryOperators指定条件
   Query Operators

   # {query critera}
   {<filed1>:{<operator1>：<value1>},..}
   

   import static com.mongodb.client.model.Filters.*;
   
   @Test
   public void find() {
       mongoTemplate.getCollection(Entity.TABLE_NAME).find(eq("name","张三"));
   }
   
   

4. 指定And

 # {query critera} 既满足field1又满足field2
 {<filed1>:<value1>,<filed2>:{<operator1>：<value1>},..}

import static com.mongodb.client.model.Filters.*;
@Test
 public void findAnd() {
     mongoTemplate.getCollection(KGCSHeadEntity.TABLE_NAME).find(and(in("name",Arrays.asList("张三","李四")),eq("age",19)));
 }

5. 指定Or

 # {query critera} field1或满足field2
 {$or:[<field1>:<value1>,<field1>:<value2>]}

import static com.mongodb.client.model.Filters.*;
@Test
 public void findAnd() {
     mongoTemplate.getCollection(KGCSHeadEntity.TABLE_NAME).find(or(in("name",Arrays.asList("张三","李四")),eq("age",19)));
 }

6. 既有And又有Or

   # {query critera} field1或满足field2
   {{<field3>:<value3>}:,$or:[<field1>:<value1>,<field2>:<value2>]}
   

   import static com.mongodb.client.model.Filters.*;
   @Test
    public void findAndOr() {
        mongoTemplate.getCollection(KGCSHeadEntity.TABLE_NAME).find(
                and(in("name",Arrays.asList("张三","李四"))
                        ,or(eq("age",19),eq("gender","male"))));
    }
   
   

1.1 nested documents

1. 匹配内嵌的文档

   # 准确匹配，值相等且field顺序也要一致
    {<field>:{<filed1>:<value1>,<filed2>:<value1>}}
   

    @Test
    public void testMatchAnEmbeddedDocument() {
        Document bson = new Document().append("h", 14).append("w", 21).append("uom", "cm");
        Document size = new Document().append("size",bson);
        List<Inventory> list = template.find(new BasicQuery(size), Inventory.class);
        System.out.println(
                JSONObject.toJSONString(list)
        );
    }
   
   

2. 查询内嵌文档的field 同上
   field字段必须使用引号括起来，用.符号标识内嵌关系"field.nestedfield"

   { <field1>: { <operator1>: <value1> }, ... }
   

   1. 相等

   db.inventory.find( { "size.uom": "in" } )
   

   @Test
    public void testQueryOnNestedField() {
        Query query = Query.query(new Criteria("size.uom").is("in"));
        List<Inventory> list = template.find(query, Inventory.class);
        System.out.println(
                JSONObject.toJSONString(list)
        );
    }
   

   2. queryOperators指定条件

   # { : { :  }, ... }
   db.inventory.find( { "size.h": { $lt: 15 } } )
   

   @Test
    public void testMatchUserQueryOperator() {
        Query query = Query.query(new Criteria("size.h").lt(15));
        List<Inventory> list = template.find(query, Inventory.class);
        System.out.println(
                JSONObject.toJSONString(list)
        );
    }
   

   3. and

   db.inventory.find( { "size.h": { $lt: 15 }, "size.uom": "in", status: "D" } )
   

   import static org.springframework.data.mongodb.core.query.Criteria.*;
   @Test
    public void testSpecifyAndCondition() {
        Query query = Query.query(new Criteria().andOperator(
           where("size.h").lt(15),
           where("size.uom").is("in"),
           where("status").is("A")
        ));
        List<Inventory> list = template.find(query, Inventory.class);
        System.out.println(
                JSONObject.toJSONString(list)
        );
    }
   

1.2 query an array

1. 匹配array

   # 匹配一个数组，只含两个元素value1,value2，且value顺序一致
   db.collectionNames.find({<field1>:[<value1>,<value2>]})
   # $all符号能够 校验array中是否含有value1和value2两个值，顺序无所谓
   db.collectionNames.find({<field1>:{$all:[<value1>,<value2>]}})
   

@Test
public void matchAnArray(){
Document document = new Document().append(“tags”, Arrays.asList(“red”,“blank”));
List list1 = template.find(new BasicQuery(document), Inventory.class);
System.out.println(
JSONObject.toJSONString(list1)
);
System.out.println(“+++++++++++++++++++++”);
Query query = Query.query(new Criteria(“tags”).all(Arrays.asList(“red”,“blank”)));
List list2 = template.find(query, Inventory.class);
System.out.println(
JSONObject.toJSONString(list2)
);
}

2. 查询array包含至少包含一个指定值
```shell
# field1中的array包含value1这个元素
db.collectionNames.find({:})

# field1中的元素
db.collectionNames.find({:{：}})

@Test
 public void testQueryAnArrayForAnElement(){
     Query query = Query.query(new Criteria("tags").is("red"));
     List<Inventory> list1 = template.find(query, Inventory.class);
     System.out.println(
             String.format("数量:%d,结果:%s",list1.size(),JSONObject.toJSONString(list1))
     );
     System.out.println("+++++++++++++++++++++");
     Query query2 = Query.query(new Criteria("dim_cm").gt(25));
     List<Inventory> list2 = template.find(query2, Inventory.class);
     System.out.println(
             String.format("数量:%d,结果:%s",list2.size(),JSONObject.toJSONString(list2))
     );
 }

3. 复杂条件
   1. 元素符合条件中的一个

      # dim_cm中元素有的元素只符合大于15，有的元素只符合小于20,或者有的元素同时满足大于15小于20，也就是说存在部分元素的组合满足了查询条件
      db.inventory.find( { dim_cm: { $gt: 15, $lt: 20 } } )
      

      @Test
      public void testQueryCompoundFilter(){
          Query query = Query.query(new Criteria().andOperator(
                  Criteria.where("dim_cm").gt(15),
                  Criteria.where("dim_cm").lt(20)
          ));
      
          List<Inventory> list2 = template.find(query, Inventory.class);
          System.out.println(
                  String.format("数量:%d\n,结果:%s",list2.size(),JSONObject.toJSONString(list2))
          );
      }
      
      

   2. 元素符合所有条件

      # 至少有一个元素，满足该条件
      db.inventory.find( { dim_cm: {$elemMatch ：{ $gt: 15, $lt: 20 } } })
      

      @Test
      public void testQueryAnArrayElementThatMeetsMultipleCriteria(){
      
          Query query = Query.query(
                  Criteria.where("dim_cm").elemMatch(
                          new Criteria().lt(30).gt(22)
                  )
          );
          List<Inventory> list2 = template.find(query, Inventory.class);
          System.out.println(
                  String.format("数量:%d\n,结果:%s",list2.size(),JSONObject.toJSONString(list2))
          );
      }
      

   3. 根据数组下标查询
      .符号，双引号括起来

      # 查询满足 数组第2个元素大于25的数据
      db.inventory.find( { "dim_cm.1": { $gt: 25 } } )
      

      @Test
      public void testQueryAnArrayByArrayIndexPosition(){
      
          Query query = Query.query(
                  Criteria.where("dim_cm.1").gt(25)
          );
          List<Inventory> list2 = template.find(query, Inventory.class);
          System.out.println(
                  String.format("数量:%d\n,结果:%s",list2.size(),JSONObject.toJSONString(list2))
          );
      }
      

   4. 根据数组长度查询

      # 
      db.inventory.find( { "tags":{$size: 3} } )
      

      @Test
      public void testQueryAnArrayByArrayLength(){
      
          Query query = Query.query(
                  Criteria.where("tags").size(3)
          );
          List<Inventory> list2 = template.find(query, Inventory.class);
          System.out.println(
                  String.format("数量:%d\n,结果:%s",list2.size(),JSONObject.toJSONString(list2))
          );
      }
      

1.3查询embedded document

1. 准确查询 equality match
   按整个document来匹配，包括field的顺序

    db.inventory.find( { "instock": { warehouse: "A", qty: 5 } } )
   

   @Test
    public void testQueryForADocumentNestedInAnArray() {
        Query query = Query.query(Criteria.where("instock").is(new Instock("A",5)));
        List<Inventory> list = template.find(query, Inventory.class);
        System.out.println(
                String.format("数量:%d\n,结果:%s",list.size(),JSONObject.toJSONString(list))
        );
    }
   

2. 查询数组中的document中的field
   1. 查询数组中的document中的某个field

   db.inventory.find( { 'instock.qty': { $lte: 20 } } )
   

   @Test
   public void testSpecifyAQueryConditionOnAFieldEmbeddedInAnArrayOfDocuments() {
       List<Inventory> list = template.find(
               Query.query(
                       Criteria.where("instock.qty").lte(20)
               )
               , Inventory.class);
       System.out.println(
               String.format("数量:%d\n,结果:%s",list.size(),JSONObject.toJSONString(list))
       );
   }
   

   2. 使用数组下标查询嵌套document的field

   # instock第0个元素的qty的值少于等于20
   db.inventory.find( { 'instock.0.qty': { $lte: 20 } } )
   

3. 多条件查询

   1. 数组中至少一个内嵌元素同时满足多个条件

        # instock中至少有一个元素有qty和warehouse字段，且值为5和A
        db.inventory.find( { "instock": { $elemMatch: { qty: 5, warehouse: "A" } } } )
        # instock中至少有一个元素有qty且大于10小于等于20
        db.inventory.find( { "instock": { $elemMatch: { qty: { $gt: 10, $lte: 20 } } } } )
      

      @Test
      public void testASingleNestedDocumentMeetsMultipleQueryConditionsOnNestedFields() {
          List<Inventory> list = template.find(
                  Query.query(
                          Criteria.where("instock").elemMatch(
                                  Criteria.where("qty").is(5).and("warehouse").is("A")
                          )
                  )
                  , Inventory.class);
          System.out.println(
                  String.format("数量:%d\n,结果:%s",list.size(),JSONObject.toJSONString(list))
          );
      
          //错误的，不好使
          List<Inventory> list2 = template.find(
                  Query.query(
                          Criteria.where("instock").elemMatch(
                                  Criteria.where("instock.qty").is(5).and("instock.warehouse").is("A")
                          )
                  )
                  , Inventory.class);
          System.out.println(
                  String.format("数量:%d\n,结果:%s",list2.size(),JSONObject.toJSONString(list2))
          );
          List<Inventory> list3 = template.find(
                Query.query(
                        Criteria.where("instock").elemMatch(
                                Criteria.where("qty").gt(10).lt(20)
                        )
                )
                , Inventory.class);
        System.out.println(
                String.format("数量:%d\n,结果:%s",list3.size(),JSONObject.toJSONString(list3))
        );
      }
      

   2. 元素的组合满足多个条件

      # instock中至少有一个元素的qty是5，至少有一个元素的warehouse是A
      db.inventory.find( { "instock.qty": 5, "instock.warehouse": "A" } )
      

      @Test
      public void testCombinationOfElementsSatisfiesTheCriteria(){
          List<Inventory> list1 = template.find(
                  Query.query(
                          Criteria.where("instock.qty").gt(10).lte(20)
                  )
                  , Inventory.class);
          System.out.println(
                  String.format("数量:%d\n,结果:%s",list1.size(),JSONObject.toJSONString(list1))
          );
      
          List<Inventory> list2 = template.find(
                  Query.query(
                          Criteria.where("instock.qty").is(5).and("instock.warehouse").is("A")
                  )
                  , Inventory.class);
          System.out.println(
                  String.format("数量:%d\n,结果:%s",list2.size(),JSONObject.toJSONString(list2))
          );
      }
      

1.4 控制返回的字段

db.collectionName.find({query critera},{projection})

1. 控制返回的字段

   # 只返回item和status和id
   db.inventory.find( { status: "A" }, { item: 1, status: 1 } )
   

   @Test
    public void testReturnSpecifiedFieldsAndThe_idFieldOnly(){
        Query query = Query.query(
                Criteria.where("status").is("A")
        );
        query.fields().include("item","status");
        List<Inventory> list1 = template.find(query, Inventory.class);
        System.out.println(
                String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
        );
    }
   

2. 不返回id字段

   # 不返回id,只返回item和status,
   db.inventory.find( { status: "A" }, { item: 1, status: 1, _id: 0 } )
   

   @Test
    public void testSuppress_idField(){
        Query query = Query.query(
                Criteria.where("status").is("A")
        );
        query.fields().include("item","status").exclude(Fields.UNDERSCORE_ID);
        List<Inventory> list1 = template.find(query, Inventory.class);
        System.out.println(
                String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
        );
    }
   

3. 返回除了个别字段的所有字段

   # 不返回status和instock
   db.inventory.find( { status: "A" }, { status: 0, instock: 0 } )
   

   @Test
    public void testReturnAllButTheExcludedFields(){
        Query query = Query.query(
                Criteria.where("status").is("A")
        );
        query.fields().exclude("status","instock");
        List<Inventory> list1 = template.find(query, Inventory.class);
        System.out.println(
                String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
        );
    }
   

4. 控制嵌入文档的返回字段

    db.inventory.find({ status: "A" },{ item: 1, status: 1, "size.uom": 1 })
   { item: 1, status: 1, size: { uom: 1 } }.
   

   @Test
    public void testReturnSpecificFieldsInEmbeddedDocument(){
        Query query = Query.query(
                Criteria.where("status").is("A")
        );
        query.fields().include("status","instock","size.uom");
        List<Inventory> list1 = template.find(query, Inventory.class);
        System.out.println(
                String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
        );
    }
   

5. 控制嵌入文档的返回字段除了XXX

   db.inventory.find({ status: "A" },{ "size.uom": 0 })
   

    @Test
    public void testProjectionOnEmbeddedDocumensInAnArray(){
        Query query = Query.query(
                Criteria.where("status").is("A")
        );
        query.fields().exclude("size.uom");
        List<Inventory> list1 = template.find(query, Inventory.class);
        System.out.println(
                String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
        );
    }
   

6. 在列表中的嵌入式文档的字段

   db.inventory.find( { status: "A" }, { item: 1, status: 1, "instock.qty": 1 } )
   

   @Test
    public void testProjectionOnEmbeddedDocumensInAnArray(){
        Query query = Query.query(
                Criteria.where("status").is("A")
        );
        query.fields().include("item","status","instock.qty");
        List<Inventory> list1 = template.find(query, Inventory.class);
        System.out.println(
                String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
        );
    }
   

7. 返回列表中的特定元素
   project operator $elemMatch $slice $

   db.inventory.find( { status: "A" }, { item: 1, status: 1, instock: { $slice: -1 } } )
   

@Test
public void testProjectSpecificArrayElementsInTheReturnedArray(){
Query query = Query.query(
Criteria.where(“status”).is(“A”)
);
query.fields().include(“item”,“status”).slice(“instock”,-1);
List list1 = template.find(query, Inventory.class);
System.out.println(
String.format(“数量:%d\n,结果:%s”,list1.size(), JSONObject.toJSONString(list1))
);
}

### 1.5 查询值为null的字段
1. equality状态
```shell
 # 查询item值是null 或item字段不存在的数据
 db.inventory.find( { item: null } )

@Test
 public void testEqualityFilter(){

     List<Inventory> list1 = template.find(
             Query.query(Criteria.where("item").is(null))
             ,Inventory.class
     );
     System.out.println(
             String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
     );
 }

2. type check

   #这个10是BSON value中null的代表，或者{$type:"null"}也可以
   # https://www.mongodb.com/docs/v5.0/reference/bson-types/
   db.inventory.find( { item : { $type: 10 } } )
   

   @Test
    public void testTypeCheck(){
   
        List<Inventory> list1 = template.find(
                Query.query(Criteria.where("item").type(JsonSchemaObject.Type.NULL))
                ,Inventory.class
        );
        System.out.println(
                String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
        );
    }
   

3. existence check

   # 查询item字段不存在的数据
   db.inventory.find( { item : { $exists: false } } )
   
   

   @Test
    public void existenceCheck(){
   
        List<Inventory> list1 = template.find(
                Query.query(Criteria.where("item").exists(false))
                ,Inventory.class
        );
        System.out.println(
                String.format("数量:%d\n,结果:%s",list1.size(), JSONObject.toJSONString(list1))
        );
    }