创建数据库和表后,我们可以开始向其中添加数据。
以下是一些需要遵循的语法规则:
INSERT INTO 语句用于向 MySQL 表添加新记录:
INSERT INTO table_name (column1, column2, column3,...)
VALUES (value1, value2, value3,...)
要了解有关 SQL 的更多信息,请访问我们的SQL教程。
在上一章中,我们创建了一个名为 "MyGuests" 的空表,其中包含五列:"id"、"firstname"、"lastname"、"email" 和 "reg_date"。现在,让我们用数据填充表格。
笔记:如果列是 AUTO_INCRMENT(如 "id" 列)或默认更新为 current_timesamp 的 TIMESTAMP(如 "reg_date" 列),则无需在 SQL 查询中指定; MySQL 会自动添加该值。
以下示例将新记录添加到 "MyGuests" 表:
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
if ($conn->query($sql) === TRUE) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
?>
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$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 "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
mysqli_close($conn);
?>
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
// use exec() because no results are returned
$conn->exec($sql);
echo "New record created successfully";
} catch(PDOException $e) {
echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>
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