Detailed explanation of how php7 implements MongoDB fuzzy query

How to implement MongoDB fuzzy query in php7? I believe that the MongoDB fuzzy query statement is familiar to everyone. This article mainly introduces the method of implementing fuzzy query in MongoDB in PHP 7. The article gives a detailed introduction and sample code, which has certain reference and learning value for everyone. I hope to be helpful.

Preface

In actual development, there are many scenarios where fuzzy query needs to be used. MongoDB shell fuzzy query is very simple:

db.collection.find({'_id': /^5101/})

The above sentence is the content of query_id starting with '5101'.

Fuzzy query is quite simple in the old MogoDB. Here is a brief record of the operation method of fuzzy query:

Under the command line:

db.letv_logs.find({"ctime":/uname?/i});

php operation

$query=array("name"=>new MongoRegex("/.*”.$name.".*/i"));
$db->find($query);

The following mainly talks about how to query in the new PHP driver:

$query = new \MongoDB\Driver\Query('_id' => ['$regex' => '^5101']);
$this->getManager()->executeQuery($this->dbname . $this->collection, $query);

The above is the implementation of fuzzy query in the new driver. To be honest, I really complain about this new driver. Compared with the old driver, the function name is too long. . . It’s almost more than Swift’s function names. Moreover, many functions of the old driver have been removed from the new driver. Although a mongodb php library class library is provided for operation, there are more than 60 files in this library, sometimes more than my project files. What's wrong with this. I recommend encapsulating a Driver class yourself for use.

The above complaint is a bit off topic. In addition to direct fuzzy query, when using it with $in or $nin, you need to pay special attention to:

$filter = ['_id' => ['$in' => ['$regex' => '^5101']]];

If you write the filter as above, a fatal error will be thrown during execution:

PHP Fatal error: Uncaught MongoDB\Driver\Exception\ConnectionException: $in needs an array in filename

It says that $in needs to provide a Array, then we change the above $filter and give it an array:

$filter = ['_id' => ['$in' => [['$regex' => '^5101']]];

But unfortunately, we still cannot successfully get the desired result:

PHP Fatal error: Uncaught MongoDB\Driver\Exception\ConnectionException: cannot nest $ under $in in filename

It says $ cannot appear in $in, so what should I do? In fact, to use fuzzy matching in $in or $nin, you need to use an instance of the \MongoDB\BSON\Regex class:

$filter = ['_id' => ['$in' => [new \MongoDB\BSON\Regex('^5101','i')]]];

This time we finally got the results we wanted.

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