php语言之mysql操作
时间: 2023-07-22 14:33:06 浏览: 43
PHP语言可以使用MySQLi和PDO两种方式来操作MySQL数据库。
使用MySQLi:
连接MySQL数据库:
```
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB"; // 数据库名称
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接是否成功
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
```
插入数据:
```
$sql = "INSERT INTO myTable (id, name, age) VALUES (1, 'John', 25)";
if ($conn->query($sql) === TRUE) {
echo "新记录插入成功";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
```
查询数据:
```
$sql = "SELECT id, name, age FROM myTable";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Age: " . $row["age"]. "<br>";
}
} else {
echo "0 结果";
}
```
关闭连接:
```
$conn->close();
```
使用PDO:
连接MySQL数据库:
```
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB"; // 数据库名称
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// 设置 PDO 错误模式为异常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "连接成功";
}
catch(PDOException $e)
{
echo "连接失败: " . $e->getMessage();
}
```
插入数据:
```
$sql = "INSERT INTO myTable (id, name, age) VALUES (1, 'John', 25)";
try {
// 使用 exec(),因为没有结果返回
$conn->exec($sql);
echo "新记录插入成功";
}
catch(PDOException $e)
{
echo $sql . "<br>" . $e->getMessage();
}
```
查询数据:
```
$sql = "SELECT id, name, age FROM myTable";
$stmt = $conn->prepare($sql);
$stmt->execute();
// 设置结果集为关联数组
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
while ($row = $stmt->fetch()) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Age: " . $row["age"]. "<br>";
}
```
关闭连接:
```
$conn = null;
```