mongoose mongodb tutorial

Implementation tutorial of MongoDB set field matching query method, mongodb Field MongoDB is a distributed file storage-based database. This article describes how to perform matching queries on the fields integrated in MongoDB records.1. Create a Test Database use testdbdb.

Dropdatabase () methodThe MongoDB db.dropdatabase () command is used to delete an existing database.Grammar:The basic syntax for the dropdatabase () command is as follows:DB. Dropdatabase() This will delete the selected database. If you have not selected any databases, then it will delete the default ' test ' databaseExample:First, check the list database by using the command show DBS>Show dbslocal 0.78125GB0.23012GB0.23012GB> If you want t

," nmodified ": 1}) 2.3. Deleting documentsMongoDB removes the document from the collection with remove ()FormatDb. Collection_name.remove (Delletion_critteria,justone)Justone if set to TRUE or 1, only one document is deleted.ExampleDelete the document named ' User1 ' before deleting the document that exists in the collection "user" before querying all documents after deletion to determine if the deletion was successful> Db.user.find () {"_id": ObjectId ("58e1d2f0bb1bbc3245fa754b"), "name": "L

Mongodb fuzzy query tutorial, mongodb fuzzy queryUse the RockMongo client tool for fuzzy search {"Content": "$ regex": "123456 "}Fuzzy search in other cases Query contains XXX {Name:/xxx /} Query starts with XXX {Name:/^ xxx /} Query ends with XXX {Name:/xxx ^ /} Case Insensitive Query {Name:/xxx/I} Case-insensitive fuzzy search in Spring // Completely

time of the download, there is a rule that even "stable" (for example: 1.6.x,1.8.x), the base is "development" (for example: 1.7.x,1.9.x).2.2 InstallationAfter the download, after decompression, there will be three directories. The bin directory is a program file, and the other two directories are header and library files called by C + +. Here's what some of the program files in the bin directory do: Mongo.exe command-line client Tools Mongod.exe command-line service-side tools Mongodump.exe Da

Linux under the mongodb installation and data import and export tutorial# View linux distributionsCat/etc/issue# View the linux kernel version numberUname-rI,Linux under The general steps of MongoDB installation1. Go to MongoDB 's website (https://www.mongodb.org/downloads) to download the appropriate installation pac

Tags: blog div nbsp in server https Lin address everyday technologySome time ago, learning about MongoDB, in terms of client tools, the individual thinks that NoSQL Manager for MongoDB is a better experience, the function is also more complete. Unfortunately, when looking for tutorials, found it difficult to find a more detailed tutorial, nor found the Chinese cr

:[Php_mongodb]Extension=php_mongo-1.3.1-5.3-vc9.dllAdd it directly at the end of the file.To create a xxx.php fileWrite the following code:Phpinfo ();?>If the selected version is correct, open the browser to see the following:See this note that your mongodb PHP extension has been installed successfully.4. The specific test code is as follows:CONNECTION=NEWMongo("loCalHosT:27017" ); db=CONNECTION−>DEMO;// selection data base colle= $db->user; Se

There is no MONGODB test environment can be installed on the local MongoDB service, here is MongoDB in Windows under the text installation tutorial. PHP default does not open the MongoDB extension, you need to manually download the MONGO extension on the official website, f

($where,Array("\ $set" =$newdata));#$set: Make a node equal to a given value, similar to the $pull $pullAll $pop $inc, and slowly explain the usage later/** Result: * Original data * {"_id": ObjectId ("4d635ba2d549a02801000003"), "column_name": "col123", "Column_exp": "Xiaocai"}* was replaced by * {"_id": ObjectId ("4d635ba2d549a02801000003"), "column_name": "col123", "Column_exp": "Ggggggg", "Column_fid": 444}*///* * Replace update, overwrite original record **/$where=Array("column_name" = "co

"}}]) $last Gets the final document from the source document according to the grouping. Usually, this makes sense, along with some previous applications such as "$sort"-stage. Db.mycol.aggregate ([{$group: {_id: "$by _user", Last_url: {$last: "$url"}}]) Piping ConceptsThe UNIX command shell pipeline refers to the possibility of some inputs and outputs performing operations as input to the next command. The MongoDB aggr

processes from repeatedly inserting or updating duplicate values that result.Update if CurrentThis means that when the data is updated, an expected value is given in the update condition (this value is queried first) to prevent other processes from updating this value before the update. See an example: var myDocument = db.products.findOne( { sku: "abc123" } ); if ( myDocument ) { var oldQuantity = myDocument.quantity; var oldReordered = myDocument.reordered; var results = db.products

databasesMongoDB InstallationHere, the main explanation is win under Install, about Linux under installation, then add on.Download URL: Official website (https://www.mongodb.org/downloads/#production)The Win32 is used here.The author downloads The old long time only then finishes, estimated is the personal network speed question,After installation, the following directories are found in the installation directoryConfigure path PATH [OPTIONAL]The path path is configured so that you can enter

Tags: http io os ar sp file data on CTIMongoDB projection means to select only the necessary data instead of selecting the entire data for a file. If a document has 5 fields, you need to display only 3, and then select only 3 fields.Find () methodMongoDB's Find () method, which is interpreted in the MongoDB query document, accepts the second optional parameter that is the list of fields to retrieve. In MongoDB