MongoDB for .Net Core 查詢條件之 Builders類

使用MongoDB有段時間了 今天終於有用總結下

UpdateDefinitionBuilder，SortDefinitionBuilder，ProjectionDefinitionBuilder，IndexKeysDefinitionBuilder，FilterDefinitionBuilder應用

 

Builders

//
// 摘要:
// A static helper class containing various builders.
//
// 類型參數:
// TDocument:
// The type of the document.
public static class Builders<TDocument>
{
//
// 摘要:
// Gets a MongoDB.Driver.FilterDefinitionBuilder`1.
public static FilterDefinitionBuilder<TDocument> Filter { get; }
//
// 摘要:
// Gets an MongoDB.Driver.IndexKeysDefinitionBuilder`1.
public static IndexKeysDefinitionBuilder<TDocument> IndexKeys { get; }
//
// 摘要:
// Gets a MongoDB.Driver.ProjectionDefinitionBuilder`1.
public static ProjectionDefinitionBuilder<TDocument> Projection { get; }
//
// 摘要:
// Gets a MongoDB.Driver.SortDefinitionBuilder`1.
public static SortDefinitionBuilder<TDocument> Sort { get; }
//
// 摘要:
// Gets an MongoDB.Driver.UpdateDefinitionBuilder`1.
public static UpdateDefinitionBuilder<TDocument> Update { get; }
}

 

 案例：

FilterDefinitionBuilder這個一般用作查詢條件

var builderlist = new List<FilterDefinition<BsonDocument>>();
builderlist.Add(Builders<BsonDocument>.Filter.Gte("EndTime", DateTime.UtcNow));
builderlist.Add(Builders<BsonDocument>.Filter.Eq("Type", BanType.Freeze));
builderlist.Add(Builders<BsonDocument>.Filter.Eq("RoleId", form.RoleId));
var filter = Builders<BsonDocument>.Filter.And(builderlist);

//同步

_mongoDbContext.Collection<BsonDocument>().Find(filter).SortByDescending(n => n.EndTime).ToList();

//異步
await _mongoDbContext.Collection<BsonDocument>().Find(filter).SortByDescending(n => n.EndTime).ToListAsync();

UpdateDefinitionBuilder 此類用在修改數據的時候

FilterDefinition<BsonDocument> filter = Builders<BsonDocument>.Filter.Eq("_id", id);
var list = new List<UpdateDefinition<BsonDocument>>();
list.Add(Builders<BsonDocument>.Update.Set("EndTime", DateTime.UtcNow.AddDays(day)));
list.Add(Builders<BsonDocument>.Update.Set("Operator", new UserSnapshot { Id = UserId, Name = UserName }));
list.Add(Builders<BsonDocument>.Update.Set("Remark", Remark));
list.Add(Builders<BsonDocument>.Update.Set("Category", Category));
var setfilter = Builders<BsonDocument>.Update.Combine(list);

//同步調用

_mongoDbContext.Collection<BsonDocument>().UpdateOne(filter , setfilter);

//異步調用
await _mongoDbContext.Collection<BsonDocument>().UpdateOneAsync(filter , setfilter);

 

 

 

ProjectionDefinitionBuilder  查詢指定的值

//創建約束生成器
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("RoleId");

var list = await _mongoDbContext.Collection<BsonDocument>().Find(builderFilter.Empty).Project(projection).ToListAsync();

 

//創建約束生成器
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.Exclude("RoleId");

_mongoDbContext.Collection<BsonDocument>().Find(builderFilter.Empty).Project(projection).ToListAsync();

 

 

 

SortDefinitionBuilder 排序 

FilterDefinitionBuilder<BsonDocument> builderFilter = Builders<BsonDocument>.Filter;

SortDefinitionBuilder<BsonDocument> builderSort = Builders<BsonDocument>.Sort;

//排序約束 Ascending 正序 Descending 倒序
SortDefinition<BsonDocument> sort = builderSort.Ascending("RoleId");

SortDefinition<BsonDocument> sort2 = builderSort.Descending("RoleId");

var list = await _mongoDbContext.Collection<BsonDocument>().Find(builderFilter.Empty).Sort(sort).ToListAsync();