1. 连接到MySQL数据库
$servername = "localhost";
$username = "root";
$password = "your_password";
$database = "your_database";
// 创建连接
$conn = new mysqli($servername, $username, $password, $database);
// 检查连接
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
2. 执行查询
$sql = "SELECT column1, column2 FROM your_table";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
echo "Column1: " . $row["column1"]. " - Column2: " . $row["column2"]. "<br>";
}
} else {
echo "0 results";
}
3. 插入数据
$sql = "INSERT INTO your_table (column1, column2) VALUES ('value1', 'value2')";
if ($conn->query($sql) === TRUE) {
echo "Record inserted successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
4. 更新数据
$sql = "UPDATE your_table SET column1 = 'new_value' WHERE condition";
if ($conn->query($sql) === TRUE) {
echo "Record updated successfully";
} else {
echo "Error updating record: " . $conn->error;
}
5. 删除数据
$sql = "DELETE FROM your_table WHERE condition";
if ($conn->query($sql) === TRUE) {
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . $conn->error;
}
6. 预处理语句（防止SQL注入）
$stmt = $conn->prepare("INSERT INTO your_table (column1, column2) VALUES (?, ?)");
$stmt->bind_param("ss", $value1, $value2);
// 设置参数并执行
$value1 = "new_value1";
$value2 = "new_value2";
$stmt->execute();
$stmt->close();
7. 断开连接
$conn->close();
这是一些基本的MySQLi语法，当然，对于更复杂的操作和更高级的特性，您可能需要深入了解MySQLi或者考虑使用PDO。在实际应用中，请注意防止SQL注入攻击，使用预处理语句是一种有效的防范措施。
转载请注明出处：http://www.zyzy.cn/article/detail/7978/MySQL