PHP development skills: How to implement data import and export functions

PHP development skills: How to implement data import and export functions

Importing and exporting data is one of the commonly used functions in web development. In many projects, we need to import data from external data sources into the database, or export data in the database to files in different formats. This article will introduce how to use PHP to implement data import and export functions, and give specific code examples.

1. Database import function

The database import function is usually used to import data from external data sources into the database. The following is a sample code that uses PHP to implement the database import function:

<?php
// 导入数据库配置文件
require_once 'config.php';

// 连接数据库
$conn = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

// 检测数据库连接是否成功
if ($conn->connect_error) {
    die("数据库连接失败：" . $conn->connect_error);
}

// 读取外部数据源文件，例如CSV文件
$csvFile = 'data.csv';
$handle = fopen($csvFile, 'r');

// 逐行读取CSV文件内容，并插入数据库中
while (($data = fgetcsv($handle, 1000, ',')) !== false) {
    $sql = "INSERT INTO `tablename` (`column1`, `column2`, `column3`) VALUES ('".$data[0]."', '".$data[1]."', '".$data[2]."')";
    if ($conn->query($sql) === false) {
        echo "数据导入失败：" . $conn->error;
    }
}

// 关闭文件句柄
fclose($handle);

// 关闭数据库连接
$conn->close();
?>

In the above code, we first introduce the database configuration file and then establish the database connection. Next, we use the fopen function to open the external data source file and the fgetcsv function to read the CSV file line by line. The process of inserting the read data into the database is implemented by assembling SQL statements, and finally closing the file handle and database connection.

2. Database export function

The database export function is usually used to export data in the database to files in different formats, such as CSV, Excel, etc. The following is a sample code that uses PHP to implement the database export function:

<?php
// 导入数据库配置文件
require_once 'config.php';

// 连接数据库
$conn = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

// 检测数据库连接是否成功
if ($conn->connect_error) {
    die("数据库连接失败：" . $conn->connect_error);
}

// 查询数据库中的数据
$sql = "SELECT * FROM `tablename`";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 创建CSV文件并写入表头
    $filename = 'data.csv';
    $handle = fopen($filename, 'w');
    fputcsv($handle, array('Column 1', 'Column 2', 'Column 3'));

    // 写入数据行
    while ($row = $result->fetch_assoc()) {
        fputcsv($handle, array($row['column1'], $row['column2'], $row['column3']));
    }

    // 关闭文件句柄
    fclose($handle);

    echo "数据导出成功！";
} else {
    echo "数据库中无数据！";
}

// 关闭数据库连接
$conn->close();
?>

In the above code, we also introduce the database configuration file and establish a database connection. Then, we use the SELECT statement to query the data in the database, and use the fputcsv function to write the query results to a CSV file. Finally, close the file handle and database connection.

Summary:

This article introduces how to use PHP to implement data import and export functions, and gives specific code examples. By using PHP's file operation and database operation related functions, we can easily implement data import and export functions. I hope this article can help you develop data import and export functions in actual projects.

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