在上述代码中,我们首先连接到MongoDB数据库,并选择要操作的数据库和集合。然后,我们定义了一个名为add_timestamps的钩子函数,该函数在插入或更新文档时会自动为文档添加created_at和updated_at字段,并将当前时间作为值。最后,我们通过调用register_write_hook方法将钩子函数注册到集合中。 在插入文档和更新文档...
created_at:newDate()},{name:"Bob",created_at:newDate()},{name:"Charlie",created_at:newDate()}]);// 使用$set操作符更新时间字段db.users.updateOne({name:"Alice"},{$set:{updated_at:newDate()}});// 使用$currentDate操作符更新时间字段db.users.updateOne({name:"...
timestamp: { $subtract: [ { $toDate: "$dateField" }, new Date("1970-01-01") ] } } } ]) 这将返回一个新的字段timestamp,其中包含dateField字段的时间戳。 使用Date对象的getTime方法:在Mongodb的查询语言中,可以使用Date对象的getTime方法获取日期的时间戳。例如: 代码语言:txt 复制 db.collect...
"history store table on-disk size": 0, "history store table out-of-order resolved updates that lose their durable timestamp": 0, "history store table out-of-order updates that were fixed up by moving existing records": 0, "history store table out-of-order updates that were fixed up du...
created_at_timestamp = True # < Provide a DateTimeField for document creation updated_at_timestamp = True # < Provide a DateTimeField for document updates class UserModelRequest(BaseModel): username: str = Field(example="johndoe") email
pidfile is created) --timeZoneInfo arg Full path to time zone info directory, e.g. /usr/share/zoneinfo -v [ --verbose ] [=arg(=v)] Be more verbose (include multiple times for more verbosity e.g. -vvvvv) --quiet Quieter output --logpath arg Log file to send write to...
In addition, you'll notice extra fields such as created_at and other timestamp-related data that could be helpful behind the scenes. For achievements, an array of objects might be a good idea because the achievements might change over time, and each player will likely receive more ...
Timestamp 时间戳。记录文档修改或添加的具体时间。 Object 用于内嵌文档。 Null 用于创建空值。 Symbol 符号。该数据类型基本上等同于字符串类型,但不同的是,它一般用于采用特殊符号类型的语言。 Date 日期时间。用 UNIX 时间格式来存储当前日期或时间。你可以指定自己的日期时间:创建 Date 对象,传入年月日信息。
columns: '"MOVIES"."ID"[RAW,4000], "CREATED_ON"[TIMESTAMP,11], "LAST_MODIFIED"[TIMESTAMP,11], "VERSION"[VARCHAR2,255], "DATA" /*+ LOB_BY_VALUE */ [JSON,8200]', inputStage: { stage: 'INDEX', options: 'RANGE SCAN',
Time series collections ignore the global default compression algorithm,snappy, in favor ofzstd, unless a different compression algorithm is specified using thestorageEngineoption when the collection was created. For example, to change the compression algorithm tosnappyfor a newweathercollection, add the...