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Find in mongodb php

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Mongodb is very popular open source, document based NoSQL database. In this article following tasks are done: 1. Create a database in mongoDB. In order to insert records to mongodb collection insert method is used.

SEE VIDEO BY TOPIC: Insert data in mongodb from html form with php

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Querying for documents with Doctrine is just as simple as if you weren't using Doctrine at all. Of course you always have your traditional find and findOne methods but you also have a Query object with a fluent API for defining the query that should be executed.

You have a few different ways to find documents. You can use the find method to find a document by its identifier:. The find method checks the local in memory identity map for the document before querying the database for the document. The first and only argument is optional, you can specify it later with the find , update deprecated , updateOne , updateMany or remove method:.

You can execute a query by getting a Query through the getQuery method:. Now you can execute that query and it will return an Iterator for you to iterate over the results:.

While building not complicated queries is really simple sometimes it might be hard to wrap your head around more sophisticated queries that involves building separate expressions to work properly. If you are not sure if your the query constructed with Builder is in fact correct you may want to debug it.

At this point your query is prepared - that means ODM done all its job in renaming fields to match their database name, added discriminator fields, applied filters, created correct references and all other things you employ ODM to.

If you want to just get a single result you can use the Query getSingleResult method:. You can limit the fields that are returned in the results by using the select method:. You can force MongoDB to use a specific index for a query with the hint method see hint. Combining select and hint on appropriate indexes can result in very fast covered queries. Sometimes you may want to get an array of distinct values in a collection. You can accomplish this using the distinct method:.

MongoDB's distinct command does not support sorting, so you cannot combine distinct with sort. If you would like to sort the results of a distinct query, you will need to do so in PHP after executing the query. When a query e. In this case, a managed document's data may differ from whatever was just returned by the database query. The query builder's refresh method may be used to instruct ODM to override the managed document with data from the query result.

This is comparable to calling DocumentManager::refresh for a managed document. The document's changeset will be reset in the process. Similar to refresh , readOnly instructs ODM to not only hydrate the latest data but also to create new document's instance i. This technique can prove especially useful when using select with no intent to update fetched documents. Read-only mode is not deep, i. This is a shortcoming of current implementation, may change in future and will not be considered a BC break will be treated as a feature instead.

For find queries the results by default are hydrated and you get document objects back instead of arrays. You can disable this and get the raw results directly back from mongo by using the hydrate false method:.

You can limit results similar to how you would in a relational database with a limit and offset by using the limit and skip method. If you want to an additional sort you can call sort again. The calls are stacked and ordered in the order you call the method:. The conditional operators in Mongo are available to limit the returned results through a easy to use API. Doctrine abstracts this to a fluent object oriented interface with a fluent API. Read more about conditional operators in the Mongo docs.

The references method may be used to query the owning side of a ReferenceOne relationship. In the following example, we query for all articles written by a particular user. The includesReferenceTo method may be used to query the owning side of a ReferenceMany relationship. In the following example, we query for the user s that have access to a particular account.

To do so, create a document with a text index:. You can use the conditional operations in combination with the ability to change document field values atomically. Additionally if you are modifying a field that is a reference you can pass managed document to the Builder and let ODM build DBRef object for you. You have several modifier operations available to you that make it easy to update documents in Mongo:.

By default Mongo updates only one document unless multi option is provided and true. In ODM the distinction is done by explicitly calling updateMany method of the builder:. If you want to just set the values of an entirely new object you can do so by passing false as the third argument of set to tell it the update is not an atomic one:.

In addition to updating you can also issue queries to remove documents from a collection. It works pretty much the same way as everything else and you can use the conditional operations to specify which documents you want to remove. Translate Loading Table of Contents 2. Finding Documents You have a few different ways to find documents. Debugging Queries While building not complicated queries is really simple sometimes it might be hard to wrap your head around more sophisticated queries that involves building separate expressions to work properly.

Selecting Distinct Values Sometimes you may want to get an array of distinct values in a collection. Refreshing Documents When a query e. Fetching Documents as Read-Only Similar to refresh , readOnly instructs ODM to not only hydrate the latest data but also to create new document's instance i. Disabling Hydration For find queries the results by default are hydrated and you get document objects back instead of arrays.

Limiting Results You can limit results similar to how you would in a relational database with a limit and offset by using the limit and skip method. Conditional Operators The conditional operators in Mongo are available to limit the returned results through a easy to use API.

Updating multiple documents By default Mongo updates only one document unless multi option is provided and true. Remove Queries In addition to updating you can also issue queries to remove documents from a collection.

MongoDB\Collection::find()

In addition to its ability to map tables in relational databases, Phalcon can map documents from NoSQL databases. It must be placed in the models directory. A model file must contain a single class; its class name should be in camel case notation:. By default model Robots will refer to the collection robots. If you want to manually specify another name for the mapping collection, you can use the setSource method:.

The number of documents to return in the first batch. Defaults to

MongoDB is an open-source document database that provides high performance, high availability and automatic scaling. MongoDB tries to avoid the traditional table-based relational database structure in favor of JSON-like documents with dynamic schemas MongoDB calls the format BSON , making the integration of data in certain types of applications easier and faster. Then, to install it all you needl to do is to extract the files from the zip and place the bin folder somewhere on your system. As you can see in the figure below, I put it in C:wampbinmongomongo2.

ODM (Object-Document Mapper)

The maximum number of documents to return. If unspecified, then defaults to no limit. A limit of 0 is equivalent to setting no limit. A negative limit is similar to a positive limit but closes the cursor after returning a single batch of results. As such, with a negative limit, if the limited result set does not fit into a single batch, the number of documents received will be less than the specified limit. By passing a negative limit, the client indicates to the server that it will not ask for a subsequent batch via getMore. The number of documents to return in the first batch. Defaults to A batchSize of 0 means that the cursor will be established, but no documents will be returned in the first batch. Unlike the previous wire protocol version, a batchSize of 1 for the find command does not close the cursor.

How to Sort Queries in MongoDB Using PHP

Querying for documents with Doctrine is just as simple as if you weren't using Doctrine at all. Of course you always have your traditional find and findOne methods but you also have a Query object with a fluent API for defining the query that should be executed. You have a few different ways to find documents. You can use the find method to find a document by its identifier:.

Collection provides the basic interface for the Mongo queries, mostly: insert, update, delete operations. For example:.

MongoCollection::findOne — Queries this collection, returning a single element. As opposed to MongoCollection::find , this method will return only the first result from the result set, and not a MongoCursor that can be iterated over. MongoDB's query language is quite extensive.

MongoCollection::findOne

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. So I've got this simple login function that is trying to match email address with a password in the database and compare it with the user entered data via form. I'm obviously not getting the paramaters correct for the find and findOne queries.

SEE VIDEO BY TOPIC: PHP + MongoDB EP 01 CRUD Connect, Update, Delete, Select, Insert

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Mongodb find query examples with PHP

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Restart all the services from Wamp and go on Localhost page, then you should now see a section entitled 'mongo' this means that the PHP MONGO extension is.

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