删除数据从一个MySQL表使用的MySQLi和PDO
DELETE语句用来从表中删除记录:
DELETE FROM table_name
WHERE some_column = some_value
注意:在删除语法WHERE子句:WHERE子句指定哪些记录或应该被删除的记录。 如果省略WHERE子句,所有记录都将被删除!
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让我们来看看"MyGuests"表:
ID | 名字 | 姓 | 电子邮件 | reg_date |
---|---|---|---|---|
1 | 约翰 | 母鹿 | [email protected] | 2014年10十四时26分15秒 |
2 | 玛丽 | 萌 | [email protected] | 2014年10月23日十时22分30秒 |
3 | 朱丽叶 | 杜利 | [email protected] | 2014年10月26日10时48分23秒 |
下面的实施例删除与ID = 3的记录在"MyGuests"表:
实施例(MySQLi Object-oriented)
<?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 to delete a record
$sql
= "DELETE FROM MyGuests WHERE id=3";
if ($conn->query($sql) === TRUE) {
echo "Record
deleted successfully";
} else {
echo
"Error deleting record: " . $conn->error;
}
$conn->close();
?>
实施例(MySQLi Procedural)
<?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 to delete a
record
$sql
= "DELETE FROM MyGuests WHERE id=3";
if (mysqli_query($conn, $sql)) {
echo "Record deleted
successfully";
} else {
echo "Error
deleting record: " . mysqli_error($conn);
}
mysqli_close($conn);
?>
实施例(PDO)
<?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 to delete a record
$sql
= "DELETE FROM MyGuests WHERE id=3";
// use exec() because no
results are returned
$conn->exec($sql);
echo "Record deleted successfully";
}
catch(PDOException $e)
{
echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>
记录被删除后,该表将是这样的:
ID | 名字 | 姓 | 电子邮件 | reg_date |
---|---|---|---|---|
1 | 约翰 | 母鹿 | [email protected] | 2014年10十四时26分15秒 |
2 | 玛丽 | 萌 | [email protected] | 2014年10月23日十时22分30秒 |