How to use and apply SQLite database using PHP

PHP is a popular server-side programming language that can interact with various databases to implement various functions. In this article, we will introduce how to use the PHP programming language to implement the use and application of SQLite database.

What is a SQLite database?

SQLite is a lightweight relational database management system. Its design goal is to provide a small, fast and reliable embedded database engine while maintaining SQL compatibility. Due to its small footprint, speed, ease of integration, and reliability, SQLite is popular with many programming languages, including PHP.

Why use PHP and SQLite?

PHP is a popular server-side scripting language that supports connections to various database management systems, including SQLite. In the process of using PHP, using SQLite as a data storage method can make the program more portable, lightweight, and have a certain degree of security.

In practical applications, through the combination of PHP and SQLite, various functions can be realized, including but not limited to: website background data management, data storage and reading, caching mechanism, data backup, etc. Below, we will introduce how to use PHP to connect and operate SQLite database.

Connecting to SQLite database

To connect and operate SQLite database in PHP, you need to use SQLite extension. The SQLite extension requires php_sqlite.dll or php_pdo_sqlite.dll for support. You can find these files in the PHP extension directory. If not, you can download and install the appropriate version of the SQLite extension on the PHP official website, and then configure support in the php.ini file. Next, let's take a look at how to connect to a SQLite database.

//Connect to the database, the file name of SQLite is databasename.db
$database_handle = new SQLite3('databasename.db');

Use the SQLite3 class to operate

After successfully connecting to the database, we need to use the SQLite3 class to perform database operations. The following are some examples of operations using the SQLite3 class:

//Query
$results = $database_handle->query('SELECT * FROM tablename');

//Insert data
$database_handle->exec("INSERT INTO tablename (column1, column2) VALUES ('value1','value2')");

//Update data
$database_handle-> exec("UPDATE tablename SET column1='new value' WHERE column2='value to find'");

//Delete data
$database_handle->exec("DELETE FROM tablename WHERE column= 'value to delete'");

//Close the connection
$database_handle->close();

Use the PDO class to operate

In addition to the above introduction In addition to the SQLite3 class, you can also use the PDO class in PHP to perform SQLite database operations. The advantage of using the PDO class is that data binding can be achieved by setting parameters, thereby reducing risks such as SQL injection.

The following are some examples of operations using the PDO class:

//Connect to the database
$database_handle = new PDO('sqlite:databasename.db');

//Query
$results = $database_handle->query('SELECT * FROM tablename');

//Insert data
$statement = $database_handle->prepare("INSERT INTO tablename (column1, column2) VALUES (:value1, :value2)");
$statement->bindParam(':value1', 'new value 1', PDO::PARAM_STR);
$statement- >bindParam(':value2', 'new value 2', PDO::PARAM_STR);
$statement->execute();

//Update data
$statement = $ database_handle->prepare("UPDATE tablename SET column1 = :newvalue WHERE column2 = :findvalue");
$statement->bindParam(':newvalue', 'new value', PDO::PARAM_STR);
$statement->bindParam(':findvalue', 'value to find', PDO::PARAM_STR);
$statement->execute();

//Delete data
$statement = $database_handle->prepare("DELETE FROM tablename WHERE column = :value");
$statement->bindParam(':value', 'value to delete', PDO::PARAM_STR);
$statement->execute();

//Close the connection
$database_handle = null;

Summary

In this article, we introduced how Use PHP programming language to realize the connection and operation of SQLite database. Whether using SQLite3 classes or PDO classes, in the process of implementing various functions, we should pay attention to the readability, maintainability and security of the code to ensure that the program can run normally and stably. Of course, for the SQLite database, due to its lightweight, fast, easy to integrate and reliable advantages, it is also a database management system that is worth promoting.

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