Data extraction in Yii framework: getting data from different data sources

With the rapid development of the Internet, data has become an important resource for enterprise development. In order to make better use of data, we need to extract data from different data sources for analysis and processing. In this article, we will focus on how to get data from different data sources in Yii framework.

1. Extract data from MySQL database

MySQL is one of the most popular relational databases at present, and its installation and use are very simple. Below we will introduce how to extract data from MySQL database in Yii framework.

Step One: Connect to the Database

To extract data from the MySQL database, we must first connect to the database. In the Yii framework, we can use the CDbConnection class to connect to the database. In the configuration file, we can configure the relevant information of the database as follows:

'components' =>[
'db' => [

  'class' => 'CDbConnection',
  'connectionString' => 'mysql:host=localhost;dbname=test',
  'username' => 'root',
  'password' => '123456',
  'charset' => 'utf8',

],
],

In the above code, we specify the database type, address, database name and other information through the connectionString attribute, and specify the username and password of the database through the username and password attributes.

Step 2: Execute the query statement

After connecting to the database, we can execute the query statement to extract data. In the Yii framework, we can use the CDbCommand class to execute query statements. For example, we can execute the following code to query all data in the user table:

$command = Yii::app()->db->createCommand('SELECT * FROM user');
$data = $command->queryAll();

In the above code, we first obtain the database connection object through Yii::app()->db, and then use the createCommand method to create a query object , use the queryAll method to execute the query, and save the query results to the $data variable.

2. Extract data from MongoDB database

MongoDB is a NoSQL database that uses document storage to better store large amounts of unstructured data. In the Yii framework, we can use the YiiMongoDbSuite extension to operate the MongoDB database.

Step One: Connect to the Database

To extract data from the MongoDB database, we first need to connect to the database. In the Yii framework, we can configure database-related information through the configuration file, as shown below:

'mongodb' => [
'class' => 'EMongoClient',
'server' => 'mongodb://localhost:27017',
'db' => 'test',
],

In the above code, we specify it through the class attribute Use the EMongoClient class, use the server attribute to specify the address and port number of the database, and use the db attribute to specify the name of the database to be operated.

Step 2: Execute the query statement

After connecting to the MongoDB database, we can execute the query statement to extract data. In the Yii framework, we can use the EMongoCriteria class to construct query conditions and the EMongoDocument class to execute query statements. For example, we can execute the following code to query all data in the user table:

$criteria = new EMongoCriteria();
$data = User::model()->findAll($criteria) ;

In the above code, we use the EMongoCriteria class to construct the query conditions, then obtain the User model object through User::model(), use the findAll method to execute the query, and save the query results to the $data variable middle.

3. Extract data from API interface

With the increasing development of website construction, more and more companies and institutions provide API interfaces to provide data. In the Yii framework, we can use the CUrlManager class to access the API interface and obtain data.

Step 1: Configure the API interface URL

To access the API interface, we first need to know the URL address of the API interface. In the Yii framework, we can configure the URL address of the API interface in the configuration file, as follows:

'urlManager' => [
'urlFormat' => 'path',
'showScriptName' => false,
'rules' => [

  'api/data' => 'site/getData',

],
],

In the above code, we pass the rules attribute to the API The URL of the interface is mapped to the getData method of the SiteController controller.

Step 2: Request the API interface and obtain data

After configuring the API interface URL, we can access the API interface through the CUrlManager class and obtain data. For example, we can execute the following code to request the API interface:

$url = 'http://api.example.com/data';
$ch = curl_init();
curl_setopt( $ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$data = curl_exec($ch);
curl_close($ch);

Above In the code, we first use the curl_init function to initialize a curl session, then use the curl_setopt function to set the URL address of the request and the type of the returned result, and finally execute the request through the curl_exec function and save the result to the $data variable.

in conclusion

In the Yii framework, we can use a variety of ways to extract data from different data sources. If we need to extract data from the MySQL database, we can use the CDbConnection and CDbCommand classes; if we need to extract data from the MongoDB database, we can use the EMongoClient and EMongoCriteria classes; if we need to extract data from the API interface, we can use the CUrlManager class. No matter which data source we extract data from, we need to first connect to the data source, then execute the query statement, and finally save the results to a variable. Hope this article can help you better understand data extraction in Yii framework.

The above is the detailed content of Data extraction in Yii framework: getting data from different data sources. For more information, please follow other related articles on the PHP Chinese website!