php对mysql实现增删改查
时间: 2023-06-29 16:02:50 浏览: 75
PHP可以通过MySQLi和PDO两种方式来实现对MySQL的增删改查操作。
使用MySQLi:
连接MySQL数据库:
```
$servername = "localhost";
$username = "yourusername";
$password = "yourpassword";
$dbname = "yourdbname";
// 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);
}
```
插入数据:
```
$sql = "INSERT INTO yourtable (column1, column2, column3)
VALUES ('value1', 'value2', 'value3')";
if ($conn->query($sql) === TRUE) {
echo "新记录插入成功";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
```
更新数据:
```
$sql = "UPDATE yourtable SET column1='newvalue1' WHERE id=1";
if ($conn->query($sql) === TRUE) {
echo "记录更新成功";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
```
删除数据:
```
$sql = "DELETE FROM yourtable WHERE id=1";
if ($conn->query($sql) === TRUE) {
echo "记录删除成功";
} else {
echo "Error deleting record: " . $conn->error;
}
```
查询数据:
```
$sql = "SELECT * FROM yourtable";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输出每行数据
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - column1: " . $row["column1"]. " - column2: " . $row["column2"]. "<br>";
}
} else {
echo "0 结果";
}
```
使用PDO:
连接MySQL数据库:
```
$servername = "localhost";
$username = "yourusername";
$password = "yourpassword";
$dbname = "yourdbname";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$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 yourtable (column1, column2, column3)
VALUES ('value1', 'value2', 'value3')";
$conn->exec($sql);
echo "新记录插入成功";
```
更新数据:
```
$sql = "UPDATE yourtable SET column1='newvalue1' WHERE id=1";
$conn->exec($sql);
echo "记录更新成功";
```
删除数据:
```
$sql = "DELETE FROM yourtable WHERE id=1";
$conn->exec($sql);
echo "记录删除成功";
```
查询数据:
```
$sql = "SELECT * FROM yourtable";
$result = $conn->query($sql);
if ($result->rowCount() > 0) {
// 输出每行数据
while($row = $result->fetch()) {
echo "id: " . $row["id"]. " - column1: " . $row["column1"]. " - column2: " . $row["column2"]. "<br>";
}
} else {
echo "0 结果";
}
```
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