MySQL插入数据

使用INSERT INTO语句来向MySQL表添加新的记录

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INSERT INTO table_name (column1, column2, column3,...)
VALUES (value1, value2, value3,...)

方法基本上和创建数据表一致

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<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";

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

$conn->close();

运行结果
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新记录插入成功

avatar

面向过程

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<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDB";
 
// 创建连接
$conn = mysqli_connect($servername, $username, $password, $dbname);
// 检测连接
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
 
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
 
if (mysqli_query($conn, $sql)) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
 
mysqli_close($conn);

PDO

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<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDB";
 
try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // 设置 PDO 错误模式，用于抛出异常
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql = "INSERT INTO MyGuests (firstname, lastname, email)
    VALUES ('John', 'Doe', 'john@example.com')";
    // 使用 exec() ，没有结果返回 
    $conn->exec($sql);
    echo "新记录插入成功";
}
catch(PDOException $e)
{
    echo $sql . "<br>" . $e->getMessage();
}
 
$conn = null;

总结

  1. PHP 中 SQL 查询语句必须使用引号
  2. 在 SQL 查询语句中的字符串值必须加引号
  3. 数值的值不需要引号
  4. NULL 值不需要引号