mongodb shell tutorial

Tags: io sp strong on Data BS CTI new nbsp/opt/mongodb-2.6.6/bin > MONGO1. Querying all local database names> Show DBS2. Switch to the specified database environment (if no database is specified, create a new library)> Use test;3. Created a collection called ' EMP '> db.createcollection (' emp ');{"OK": 1}4. Query all clustered collections under the current library collection (equivalent to table)> Show Collections;EmpSystem.indexes5. Inserting record

This article is part of the Linux Shell Series tutorial (17), more Linux shell tutorials: Linux Shell Tutorials Through file inclusion, you can reference the contents of other files, or you can separate complex content to make the program structure clearer. So the high-level language supports file inclusion or pa

:[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

This article is part (iv) of the Linux Shell Series tutorial, more on the Shell Tutorial: Linux Shell Series Tutorials Like many programming languages, there are annotation symbols in the shell, and today we introduce the synta

($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

. Connect to MongoDB after starting well E:mongodbbinmongo.ext E:mongodbbingt;mongo MongoDB Shell version:2.6.4 Connecting To:test Welcome to the MongoDB shell. For interactive help, type ' help '. For more comprehensive documentation http://docs.mongodb.org/ Questions? Try

Mongodb import collection step tutorial, mongodbcollection It is relatively convenient for companies to use mongodb databases. Today we need to use the RobotMongodb database tool for import. Import steps: Log on to your mongodb server. We need to install it on liunx. Connect to the server via ssh. Step 2: import the f

integer, is obtained by using the MongoDB console, changing its document record (even if the integer itself is not modified, only the other parts of the document are modified), and the console is reused to write back to the database. The data type also becomes a 64-bit floating-point number. Except that when you use the console to view a 64-bit integer, you may be unsure because some 64-bit integers cannot be accurately represented as 64-bit floating

UTF-8 string2. Cannot be an empty string3. Cannot contain \ t, $4. Cannot start with _Data typeThe official tips for MongoDB support types are as follows: NULLNull is used to represent a null value or a field that does not exist. {"Tmpkey": null} BooleanThe Boolean type has two values of ' true ' and ' false1 '. {"Tmpkey": true} 32-bit integerType is not available. JavaScript only supports 64-bit floating-point numbers, so 32-bit integers are automa

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

" } ) db.categories.insert( { _id: "Databases", parent: "Programming" } ) db.categories.insert( { _id: "Languages", parent: "Programming" } ) db.categories.insert( { _id: "Programming", parent: "Books" } ) db.categories.insert( { _id: "Books", parent: null } ) For several other tree-shaped structures, please refer to the modeling methodsModel Tree StructuresModeling a Tree in a Document Database2. Quick-Action article Download Install client https://docs.mongodb.com/manual/administration/i

This article is part of the Linux Shell Series Tutorial (16), more Linux shell tutorials: Linux Shell Tutorials The output and input redirection in the shell is a feature that is often used in the use, and is very useful for you to introduce the shell's input and output

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