Use c # to MongoDB query (1)
1.BsonDocument objects
In the presence of a namespace MongoDB.Bson BsonDocument class, MongoDB document object, representing a section of the solid model data MongoDB irregularities. May be used BsonDocument irregular operation data, the type inherits IEnumberable <> type, that is in turn seen as a set of each entity model, we can obtain the value of the subscript embodiment of the mockup
//
// Summary:
// Gets, or sets A value by position.
//
// Parameters:
// index:
. At The position //
//
// return the result:
. // at The value
public BsonValue the override the this [int index ] {GET; SET;}
//
// summary:
// Gets, or A value sets by name.
//
// parameters:
// name:
// name of The.
//
// return the result:
// value of The.
the override BsonValue the this public [String name] {GET; SET;}
//
// summary:
// Gets the value of an element or a default value if the element is not found.
//
// 参数:
// name:
// The name of the element.
//
// defaultValue:
// The default value to return if the element is not found.
//
// 返回结果:
// Teh value of the element or a default value if the element is not found.
[Obsolete("Use GetValue(string name, BsonValue defaultValue) instead.")]
public virtual BsonValue this[string name, BsonValue defaultValue] { get; }
2. connection configuration
// connection address
Private Conn static String = "MongoDB: //192.168.11.51: 40000";
// database name
Private dbName static String = "Yan";
// set name
Private colName static String = "Demo";
// Connect server
static MongoClient Client = new new MongoClient (Conn);
// Get the specified database
static IMongoDatabase DB = client.GetDatabase (dbName);
// Get the specified database set BsonDocument document object
static IMongoCollection <BsonDocument> coll = db.GetCollection <BsonDocument> (colName);
3. Insert Data
var doc = new[]
{
new BsonDocument{
{ "DepartmentName","开发部"},
{ "People",new BsonArray
{
new BsonDocument{ { "Name", "狗娃" },{"Age",20 } },
new BsonDocument{ { "Name", "狗剩" },{"Age",22 } },
new BsonDocument{ { "Name", "铁蛋" },{"Age",24 } }
}
},
{"Sum",18 },
{ "dim_cm", new BsonArray { 14,}} 21 is
{ "the DepartmentName", "test section"},
},
new BsonDocument{
{ "People",new BsonArray
{
new BsonDocument{ { "Name", "张三" },{"Age",11 } },
new BsonDocument{ { "Name", "李四" },{"Age",34 } },
new BsonDocument{ { "Name", "王五" },{"Age",33 } }
}
}
,
{ "Sum",4 }
,
{ "dim_cm", new BsonArray { 14, 21 } }
},
new BsonDocument{
{ "DepartmentName","运维部"},
{ "People",new BsonArray
{
new BsonDocument{ { "Name", "闫" },{"Age",20 } },
new BsonDocument{ { "Name", "王" },{"Age",22 } },
new BsonDocument{ { "Name", "赵" },{"Age",24 } }
}
},
{ "Sum",2 },
{ "dim_cm", new BsonArray { 22.85, 30 } }
}
};
coll.InsertMany(doc);
4. Query
4.1 Query sector is the Ministry of Information Development
// create a constraint generator
FilterDefinitionBuilder <BsonDocument> Builders builderFilter = <BsonDocument> .Filter;
// constraint
FilterDefinition <BsonDocument> filter = builder.Eq ( "DepartmentName", " Development");
// get the data
var result = coll.Find <BsonDocument> (filter) .ToList ();
the foreach (var in Item Result)
{
// remove the entire value
Console.WriteLine (item.AsBsonValue);
}
4.2 Sum greater than the data acquisition 4
// create a constraint generator
FilterDefinitionBuilder <BsonDocument> Builders builderFIlter = <BsonDocument> .Filter;
// constraint
FilterDefinition <BsonDocument> = builder.Gt filter ( "the Sum",. 4);
var = coll.Find Result <BsonDocument> ( filter) .ToList ();
the foreach (var in Item Result)
{
// remove the entire value
Console.WriteLine (item.AsBsonValue);
}
4.3 And Constraints
// create a constraint generator
FilterDefinitionBuilder <BsonDocument> Builders builderFilter = <BsonDocument> .Filter;
// constraint
FilterDefinition <BsonDocument> filter = builder.And ( builder.Gt ( "Sum", "2"), builder.Eq ( "DepartmentName", "O & M"));
var = coll.Find Result <BsonDocument> (filter) .ToList ();
the foreach (var in Item Result)
{
// remove the entire value
Console.WriteLine (item.AsBsonValue) ;
}
4.4 query specified value
//创建约束生成器
FilterDefinitionBuilder<BsonDocument> builderFilter = Builders<BsonDocument>.Filter;
ProjectionDefinitionBuilder<BsonDocument> builderProjection = Builders<BsonDocument>.Projection;
//Include 包含某元素 Exclude 不包含某元素
ProjectionDefinition<BsonDocument> projection = builderProjection.Include("DepartmentName").Exclude("_id");
var result = coll.Find<BsonDocument>(builderFilter.Empty).Project(projection).ToList();
foreach (var item in result)
{
//取出整条值
Console.WriteLine(item.AsBsonValue);
}
4.5 Sorting
// Create generator
FilterDefinitionBuilder <BsonDocument> Builders builderFilter = <BsonDocument> .Filter;
// sequencing producer
SortDefinitionBuilder <BsonDocument> Builders builderSort = <BsonDocument> .Sort;
// Sort Ascending positive sequence restraint Descending descending
SortDefinition <BsonDocument> sort builderSort.Ascending = ( "the Sum");
var = coll.Find Result <BsonDocument> (builderFilter.Empty) .Sort (Sort) .ToList ();
the foreach (var in Item Result)
{
// remove the entire value
Console. the WriteLine (item.AsBsonValue);
}
4.6 In the query
// Create generator
FilterDefinitionBuilder <BsonDocument> Builders builderFilter = <BsonDocument> .Filter;
FilterDefinition <BsonDocument> = builderFilter.In filter ( "the DepartmentName" new new [] { "test section", "Development"});
var Result coll.Find = <BsonDocument> (filter) .ToList ();
the foreach (var in Item Result)
{
// remove the entire value
Console.WriteLine (item.AsBsonValue);
}
4.7 paging query
// Create generator
FilterDefinitionBuilder <BsonDocument> Builders builderFilter = <BsonDocument> .Filter;
// Query tab Skip Skip Limit number
var result = coll.Find <BsonDocument> ( builderFilter.Empty) .Skip (1) .Limit (1 ) .ToList ();
the foreach (var in Item Result)
{
// remove the entire value
Console.WriteLine (item.AsBsonValue);
}
4.8 The total number of entries in the query
// Create generator
FilterDefinitionBuilder <BsonDocument> Builders builderFilter = <BsonDocument> .Filter;
// total number of entries
var result = coll.Find <BsonDocument> ( builderFilter.Empty) .Count ();
4.9Linq inquiry
//创建生成器//linq
var result = from y in coll.AsQueryable() select new { DepartmentName = y["DepartmentName"], id = y["_id"] };
foreach (var item in result)
{
Console.WriteLine("DepartmentName:" + item.DepartmentName + "====Id:"+item.id);
}
4.10 grouping queries
//创建生成器
FilterDefinitionBuilder<BsonDocument> builderFilter = Builders<BsonDocument>.Filter;
//分组
var result = from y in coll.AsQueryable() group y by y["DepartmentName"] into s select new { DepartmentName = s.Key, Count = s.Count() };
foreach (var item in result)
{
Console.WriteLine("DepartmentName:" + item.DepartmentName + "====Count:"+item.Count);
}
4.11连表查询
//linq
//连表查询 在这里是自己连自己
var result = from u in coll.AsQueryable() join o in coll.AsQueryable() on u["_id"] equals o["_id"] select new { DepartmentName1 = u["DepartmentName"], DepartmentName2 = u["DepartmentName"] };
foreach (var item in result)
{
Console.WriteLine("DepartmentName1:" + item.DepartmentName1 + "====DepartmentName2:" + item.DepartmentName2);
}
Category: MongoDB