How to insert data into the database in php (detailed steps)

PHP is a popular web programming language that is extremely suitable for working with databases. PHP code can use various databases (such as MySQL, Oracle, SQLite, etc.) to connect, query and operate to achieve data storage and retrieval. Among them, inserting database records is a very common operation. Next, we will introduce how to use PHP to insert data into the database.

1. Connect to the database

Before doing any database operations, we need to connect to the database first. It is possible to connect using existing PHP libraries such as MySQLi or PDO. The following is a sample code for connecting using MySQLi:

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

Note that we need to replace the "$servername", "$username", "$password" and "$dbname" variables in the above sample code with actual of sensitive information.

2. Building SQL Statements

Once we have accurately connected to the database, we can start performing actual database operations. In this case we want to add some data to the database. To do this, we need to build an insert query using SQL statements to insert the required data into the table. The following is an example of an insert query:

$sql = "INSERT INTO table_name (column1, column2, column3,...)
VALUES (value1, value2, value3,...)";

Please note that "table_name" should be replaced with the actual table name, and "column1", "column2", "column3", etc. should be replaced with the actual existing column names. Likewise, "value1", "value2", etc. should be replaced with the actual values.

It is worth mentioning that we need to ensure that the value provided is properly formatted to prevent any form of SQL injection attack.

3. Execute the query

Once we have constructed the SQL query, we can execute the query in PHP using the database connection created in the first step. Using MySQLi, we can execute a query using the following code:

if ($conn->query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

As mentioned above, we check if there are any errors after the query and if there are errors, we return them to the user.

4. Release resources and close connections

Finally, we need to release any resources that have been allocated to us. If not released, it may cause memory leaks or other resource exhaustion issues. Using MySQLi, we can do this using the following code:

// 关闭连接
$conn->close();

Summary

Before inserting data into the database using PHP, we need to make sure we are connected to the correct database and ensure all The values ​​are all formatted correctly. Once we execute the insert query and release the resources, we can manipulate the application's data over the network or other means. While the steps to insert data into a database may seem very simple, making sure you take the necessary security measures and perform these steps correctly can ensure the integrity and availability of your data.

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