Mongodb的数组操作

数组存储是Mongodb的一个非常遍历的地方，可以不用存储上下文关联关系，直接级联删除。本文这里简单的介绍下数组的用法：

数据：

var record = new
{
Id = “t1”,
Name = “tt1”,
SubTypes = new object[]
{
new {Id = “s1”, Value = “11”},
new {Id = “s2”, Value = “l22”},
}
};

table.InsertOne(record.ToBsonDocument());

插入：

var filter = new {Id = “t1”}.ToBsonDocument();

var push = Builders<BsonDocument>.Update.Push(“SubTypes”, new { Id = “s3”, Value = “333” });
table.UpdateOne(filter, push);

删除：

var filter = new {Id = “t1”}.ToBsonDocument();

var pull = Builders<BsonDocument>.Update.Pull(“SubTypes”, new { Id = “s2” });
table.UpdateOne(filter, pull);

更新：

更新则要复杂些：

var filter = new BsonDocument()
{
[“_id”] = “t1”,
[“SubTypes._id”] = “s1”
};

var set = Builders<BsonDocument>.Update.Set(“SubTypes.$.Value”, “v3”);
table.UpdateOne(filter, set);

参考文档：

https://docs.mongodb.com/manual/reference/operator/update-array/