From 00892fb1d4134d2629d04e3f8fbb0658a991fe5f Mon Sep 17 00:00:00 2001 From: JMARyA Date: Tue, 16 Jan 2024 09:35:22 +0100 Subject: [PATCH] refactor --- technology/applications/MongoDB.md | 74 ++++++++++++++++-------------- 1 file changed, 39 insertions(+), 35 deletions(-) diff --git a/technology/applications/MongoDB.md b/technology/applications/MongoDB.md index 5a159f2..22b4ab7 100644 --- a/technology/applications/MongoDB.md +++ b/technology/applications/MongoDB.md @@ -3,8 +3,8 @@ website: https://www.mongodb.com obj: application --- -#wip #🐇 #notnow -MongoDB is a popular NoSQL database that is document-oriented and designed for scalability and flexibility +# MongoDB +MongoDB is a popular NoSQL database that is document-oriented and designed for scalability and flexibility. You can work with MongoDB in a GUI with [MongoDB Compass](MongoDB%20Compass.md). ## Docker-Compose ```yml @@ -12,13 +12,12 @@ version: '3' services: mongo: image: mongo - container_name: mongo restart: always environment: MONGO_INITDB_ROOT_USERNAME: root MONGO_INITDB_ROOT_PASSWORD: password volumes: - - mongodb_data:/data/db + - ./db:/data/db ports: - "27017:27017" ``` @@ -63,23 +62,29 @@ To delete multiple documents: `db..deleteMany()` To delete all documents in a collection: `db..deleteMany({})` ### Filters -- $eq: The $eq operator matches documents where the value of a field equals a specified value. -- $ne: The $ne operator matches documents where the value of a field is not equal to a specified value. -- $gt: The $gt operator matches documents where the value of a field is greater than a specified value. -- $gte: The $gte operator matches documents where the value of a field is greater than or equal to a specified value. -- $lt: The $lt operator matches documents where the value of a field is less than a specified value. -- $lte: The $lte operator matches documents where the value of a field is less than or equal to a specified value. -- $in: The $in operator matches documents where the value of a field equals any value in a specified array. -- $nin: The $nin operator matches documents where the value of a field does not equal any value in a specified array. -- $and: The $and operator performs a logical AND operation on an array of two or more expressions and selects the documents that satisfy all the expressions. -- $or: The $or operator performs a logical OR operation on an array of two or more expressions and selects the documents that satisfy at least one of the expressions. -- $not: The $not operator performs a logical NOT operation on the specified expression and selects the documents that do not match the expression. -- $exists: The $exists operator matches documents where a specified field exists or does not exist. -- $type: The $type operator matches documents where a specified field has a specific BSON type. -- $regex: The $regex operator matches documents where a specified field matches a regular expression. -- $text: The $text operator performs a text search on the specified field(s). -- $elemMatch: The $elemMatch operator matches documents where a specified array field contains at least one element that matches all the specified conditions. -- $size: The $size operator matches documents where a specified array field has a specific size. +Usage: +```json +{ "field": { "$mod": "value" } } +``` + +- `$eq`: The `$eq` operator matches documents where the value of a field equals a specified value. +- `$ne`: The `$ne` operator matches documents where the value of a field is not equal to a specified value. +- `$gt`: The `$gt` operator matches documents where the value of a field is greater than a specified value. +- `$gte`: The `$gte` operator matches documents where the value of a field is greater than or equal to a specified value. +- `$lt`: The `$lt` operator matches documents where the value of a field is less than a specified value. +- `$lte`: The `$lte` operator matches documents where the value of a field is less than or equal to a specified value. +- `$in`: The `$in` operator matches documents where the value of a field equals any value in a specified array. +- `$nin`: The `$nin` operator matches documents where the value of a field does not equal any value in a specified array. +- `$and`: The `$and` operator performs a logical AND operation on an array of two or more expressions and selects the documents that satisfy all the expressions. +- `$or`: The `$or` operator performs a logical OR operation on an array of two or more expressions and selects the documents that satisfy at least one of the expressions. +- `$not`: The `$not` operator performs a logical NOT operation on the specified expression and selects the documents that do not match the expression. +- `$exists`: The `$exists` operator matches documents where a specified field exists or does not exist. +- `$type`: The `$type` operator matches documents where a specified field has a specific [BSON](../files/BSON.md) type. +- `$regex`: The `$regex` operator matches documents where a specified field matches a [regular expression](../tools/Regex.md). +- `$text`: The `$text` operator performs a text search on the specified field(s). +- `$elemMatch`: The `$elemMatch` operator matches documents where a specified array field contains at least one element that matches all the specified conditions. +- `$size`: The `$size` operator matches documents where a specified array field has a specific size. +- `$exists`: The `$exists` operator matches documents that contain or do not contain a specified field, including documents where the field value is `null`. **Example:** ```js @@ -94,20 +99,19 @@ db.users.find( ``` ### Update Modifiers -- $set: The $set operator updates the value of a field in a document. -- $unset: The $unset operator removes a field from a document. -- $inc: The $inc operator increments the value of a field in a document. -- $mul: The $mul operator multiplies the value of a field in a document. -- $min: The $min operator updates the value of a field in a document if the new value is lower than the existing value. -- $max: The $max operator updates the value of a field in a document if the new value is higher than the existing value. -- $rename: The $rename operator renames a field in a document. -- $addToSet: The $addToSet operator adds a value to an array field in a document if the value does not already exist in the array. -- $push: The $push operator appends a value to an array field in a document. -- $pull: The $pull operator removes a value from an array field in a document. -- $currentDate: The $currentDate operator sets the value of a field in a document to the current date and time. -- $each: The $each operator can be used with $addToSet and $push to append multiple values to an array field in a document. -- $sort: The $sort operator can be used with $push to sort the elements in an array field in a document. -- $addToSet: Add an element to an array +- `$set`: The `$set` operator updates the value of a field in a document. +- `$unset`: The `$unset` operator removes a field from a document. +- `$inc`: The `$inc` operator increments the value of a field in a document. +- `$mul`: The `$mul` operator multiplies the value of a field in a document. +- `$min`: The `$min` operator updates the value of a field in a document if the new value is lower than the existing value. +- `$max`: The `$max` operator updates the value of a field in a document if the new value is higher than the existing value. +- `$rename`: The `$rename` operator renames a field in a document. +- `$addToSet`: The `$addToSet` operator adds a value to an array field in a document if the value does not already exist in the array. +- `$push`: The `$push` operator appends a value to an array field in a document. +- `$pull`: The `$pull` operator removes a value from an array field in a document. +- `$currentDate`: The `$currentDate` operator sets the value of a field in a document to the current date and time. +- `$each`: The `$each`¥ operator can be used with `$addToSet` and `$push` to append multiple values to an array field in a document. +- `$sort`: The `$sort` operator can be used with `$push` to sort the elements in an array field in a document. **Example:** ```js