Mongodb simple operation
1. After performing mongod.exe server startup, you can follow the parameters to describe the database and logs that are started.
Eg:
Mongod.exe-bind_ip 127.0.0.1-logpath "F:\ data\ dbConf\ mongodb.log"-- logappend-- dbpath "F:\ data\ db"-- port 19901-- serviceName "mongodb1"-- serviceDisplayName "mongodbAll"-- install
2. Perform mongo.exe client connection
View all databases: show dbs
Syntax format for creating a database: use DATABASE_NAME
Delete the current database: db.dropDatabase ()
Switch to database: use DATABASE_NAME
Delete collection: db.collection.drop ()
MongoDB uses the insert () or save () methods to insert documents into the collection:
Db.COLLECTION_NAME.insert (document)
MongoDB uses the update () and save () methods to update documents in the collection:
The update () method is used to update existing documents. The syntax format is as follows:
Db.collection.update (
, / / query: the query condition of update, which is similar to that after where in the sql update query.
, / / update: the object of update and some updated operators (such as $, $inc...), etc., can also be understood as the following set in the sql update query
{
Upsert: / / upsert: optional, this parameter means that if there is no record of update, whether to insert objNew,true is insert, default is false, do not insert.
Multi: / / multi: optional. Mongodb defaults to false. Only the first record found is updated. If this parameter is true, all records found by condition will be updated.
WriteConcern: / / writeConcern: optional, the level at which the exception is thrown.
}
)
The save () method replaces an existing document with an incoming document. The syntax format is as follows:
Db.collection.save (
{
WriteConcern:
}
)
Db.col.update ({'title':'MongoDB tutorial'}, {$set: {'title':'MongoDB'}})
MongoDB deletes a document
Parameter description:
Document: document data.
WriteConcern: optional, the level at which the exception is thrown.
The basic syntax format of the remove () method is as follows:
Db.collection.remove (
)
Remove all data: db.col.remove ({})
The syntax format of MongoDB query data is as follows:
Db.COLLECTION_NAME.find ()
Read data in a readable manner
Db.col.find () .pretty ()
Similar statements in the example RDBMS of the action format
Equals {:} db.col.find ({"by": "Rookie tutorial"}) .pretty () where by = "Rookie tutorial"
Less than {: {$lt:} db.col.find ({"likes": {$lt:50}}) .pretty () where likes
< 50 小于或等于 {:{$lte:}} db.col.find({"likes":{$lte:50}}).pretty() where likes 50 大于或等于 {:{$gte:}} db.col.find({"likes":{$gte:50}}).pretty() where likes >= 50
Not equal to {: {$ne:} db.col.find ({"likes": {$ne:50}}) .pretty () where likes! = 50
The conditional operators in MongoDB are:
(>) greater than-$gt
(=) greater than or equal to-$gte
(100)
I wrote down the above while typing the website myself.
