1.SQL查詢（SELECT）：

<?php
$servername = "localhost"; // MySQL服務器名稱或IP地址
$username = "root";       // MySQL用戶名
$password = "";           // MySQL密碼
$dbname = "myDB";         // 要連接的數(shù)據(jù)庫名稱
 
// 創(chuàng)建與MySQL數(shù)據(jù)庫的連接
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
 
// 編寫SQL查詢語句
$sql = "SELECT * FROM myTable";
 
// 執(zhí)行查詢并獲取結(jié)果集
$result = $conn->query($sql);
 
// 處理結(jié)果集
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. ", Name: " . $row["name"]. "<br>";
    }
} else {
    echo "No results found.";
}
 
// 關閉數(shù)據(jù)庫連接
$conn->close();
?>

2.SQL插入（INSERT）：

<?php
$servername = "localhost";   // MySQL服務器名稱或IP地址
$username = "root";          // MySQL用戶名
$password = "";              // MySQL密碼
$dbname = "myDB";            // 要連接的數(shù)據(jù)庫名稱
 
// 創(chuàng)建與MySQL數(shù)據(jù)庫的連接
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
 
// 編寫SQL插入語句
$sql = "INSERT INTO myTable (name, age) VALUES ('John', '30')";
 
// 執(zhí)行插入操作
if ($conn->query($sql) === TRUE) {
    echo "New record created successfully!";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}
 
// 關閉數(shù)據(jù)庫連接
$conn->close();
?>

3.SQL更新（UPDATE）：

<?php
$servername = "localhost";   // MySQL服務器名稱或IP地址
$username = "root";          // MySQL用戶名
$password = "";              // MySQL密碼
$dbname = "myDB";            // 要連接的數(shù)據(jù)庫名稱
 
// 創(chuàng)建與MySQL數(shù)據(jù)庫的連接
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
 
// 編寫SQL更新語句
$sql = "UPDATE myTable SET name='Jane' WHERE id=1";
 
// 執(zhí)行更新操作
if ($conn->query($sql) === TRUE) {
    echo "Record updated successfully!";
} else {
    echo "Error updating record: " . $conn->error;
}
 
// 關閉數(shù)據(jù)庫連接
$conn->close();
?>

4.SQL刪除（DELETE）：

<?php
$servername = "localhost"; // 數(shù)據(jù)庫服務器名稱
$username = "your_username"; // 數(shù)據(jù)庫用戶名
$password = "your_password"; // 數(shù)據(jù)庫密碼
$dbname = "your_database"; // 數(shù)據(jù)庫名稱
 
// 創(chuàng)建與數(shù)據(jù)庫的連接
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
//編寫SQL語句來執(zhí)行刪除操作。根據(jù)需求選擇合適的條件來指定要刪除的記錄。
//your_table應該被替換為要從其中刪除記錄的表格名稱，
//而condition則是指定要刪除的記錄的條件。
$sql = "DELETE FROM your_table WHERE condition";
if ($conn->query($sql) === TRUE) {
    echo "Record deleted successfully.";
} else {
    echo "Error deleting record: " . $conn->error;
}
//最后，斷開與數(shù)據(jù)庫的連接。
$conn->close();
?>