MongoDB stores data in flexible, JSON-like documents, meaning fields can vary from document to document and data structure can be changed over time.
- MongoDB Manual;
- About mongodb @ stackoverflow;
-
docs
MongoDB Examples - Structuring Document Data
- Stack Overflow;
- MongoDB Architecture Guide;
命令
- 在 linux 下将
/usr/local/mongodb/bin/加到PATH。 -
mongo即可进入 - 示例如下，详解见后。
> help
> db.help()
> db.mycoll.help()
> db.d_321100.find( {"VALUE": new BinData(0,"MzIxMTkxMjEwMDAxNDk=") } ).sort({TM:-1}).limit(1)
> db.d_321100.find( {SN: { $regex: /-32119121000149-/ }, TYPE: 101 } ).sort({TM:-1}).limit(1).pretty()
> db.d_321100.find( {SN: { $regex: /-32119121000149-/ }, TYPE: {$in:[101,102]} } ).sort({TM:-1}).limit(1)
> db.d_321100.find( {SN: { $regex: /-32119121000149-/ }, TYPE: {$in:[101,102]} } ).count()
库 libmongoc
- A Cross Platform MongoDB Client Library for C. 站内搜索做的好，可以很方便查看 数据结构和函数说明。
help
-
> help
MongoDB help > db.help()-
> db.mycoll.help()指定的 mycoll 集合的方法
help on collection methods -
db.d_320100.getIndexes查当前索引
db.d_320100.getIndexes()
示例
- 以 PAIBO 标准为示例。
- 指定场所是否有场所心跳数据？
由于场所心跳UDP数据包的内容就是场所编码，因此直接搜索所存储的二进制数据即可： - MongoDB Shell: find by BinData。
- 场所编码 32119121000149（base64值：MzIxMTkxMjEwMDAxNDk=）最近一条场所心跳数据：
db.d_321100_XXXXXXXXX.find( {"VALUE": new BinData(0,"MzIxMTkxMjEwMDAxNDk=") } ).sort({TM:-1}).limit(1)
{ "_id" : ObjectId("5c46c6cda1b9402f388908ad"),
"SN" : "321100---0-7621138-SITESTATUS-0",
"TM" : NumberLong("1548142285103"),
"UTM" : NumberLong("1548142285518"),
"FLAG" : NumberLong(200),
"TYPE" : 105,
"VALUE" : BinData(0,"MzIxMTkxMjEwMDAxNDk=")
}
pretty 格式示例
- 场所编码 32119121000149（位于 SN 中），终端上下线（TYPE 101）的最近一条格式化数据
> db.d_321100_XXXXXXXXX.find( {SN: { $regex: /-32119121000149-/ }, TYPE: 101 } ).sort({TM:-1}).limit(1).pretty()
{
"_id" : ObjectId("5c46f3eca1b9402f38b06e8f"),
"SN" : "321100-32119121000149-XXXXXXXXX749D79E98850-1548152023-7876037-WA_SOURCE_FJ_0001",
"TM" : NumberLong("1548153836614"),
"UTM" : NumberLong("1548153836707"),
"FLAG" : NumberLong(200),
"TYPE" : 101,
"VALUE" : BinData(0,"Vjk2dDVyd1VRdmp2V0VNcjVRPT0=")
}
注：示例中的 VALUE 字段值经过裁剪。即使未经裁剪，也是加密过的数据。
- 场所编码 32119121000149（位于 SN 中），终端上下线（TYPE 101）或者虚拟身份（102）的最近一条数据：
> db.d_321100_XXXXXXXXX.find( {SN: { $regex: /-32119121000149-/ }, TYPE: {$in:[101,102]} } ).sort({TM:-1}).limit(1)
- 场所编码 32119121000149（位于 SN 中），终端上下线（TYPE 101）或者虚拟身份（102）一共有多少条数据：
> db.d_321100_XXXXXXXXX.find( {SN: { $regex: /-32119121000149-/ }, TYPE: {$in:[101,102]} } ).count()
1580
正则搜索
- Selects documents where values match a specified regular expression.
- Provides regular expression capabilities for pattern matching strings in queries. MongoDB uses Perl compatible regular expressions (i.e. “PCRE” ) version 8.41 with UTF-8 support.
文本搜索
-
Text Search
Performs text search. - MongoDB supports query operations that perform a text search of string content. To perform text search, MongoDB uses a text index and the
$textoperator. - A collection can only have one text search index, but that index can cover multiple fields.
