色婷婷狠狠18禁久久YY,CHINESE性内射高清国产,国产女人18毛片水真多1,国产AV在线观看

mysql 增刪

MySQL是一種常用的關(guān)系型數(shù)據(jù)庫管理系統(tǒng)。它支持增加、刪除、修改等基本操作。本文將介紹MySQL如何進行增加和刪除的操作。

// 連接數(shù)據(jù)庫
$conn = mysqli_connect("localhost", "root", "", "test");
// 檢查是否連接成功
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
// 設(shè)置編碼格式
mysqli_set_charset($conn,"utf8");

增加新數(shù)據(jù):

// 插入數(shù)據(jù)到表中
$sql = "INSERT INTO students (name, age) VALUES ('John',20)";
if (mysqli_query($conn, $sql)) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "
" . mysqli_error($conn); }

刪除數(shù)據(jù):

// 刪除一條數(shù)據(jù)
$sql = "DELETE FROM students WHERE name='John'";
if (mysqli_query($conn, $sql)) {
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . mysqli_error($conn);
}

以上是MySQL的增加和刪除操作,這些操作是數(shù)據(jù)庫管理中非常基礎(chǔ)和常見的操作。