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mysql和php實現(xiàn)增刪差改

錢艷冰2年前9瀏覽0評論

MySQL是一種關(guān)系型數(shù)據(jù)庫,PHP是一種用于服務(wù)器端的腳本語言,它們兩者結(jié)合起來可以實現(xiàn)增刪查改操作。以下是一些示例代碼:

連接數(shù)據(jù)庫:

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 創(chuàng)建連接
$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}

插入數(shù)據(jù):

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
if ($conn->query($sql) === TRUE) {
echo "插入成功";
} else {
echo "插入失敗: " . $sql . "
" . $conn->error; }

查詢數(shù)據(jù):

$sql = "SELECT * FROM MyGuests";
$result = $conn->query($sql);
if ($result->num_rows >0) {
// 輸出數(shù)據(jù)
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "
"; } } else { echo "0 結(jié)果"; }

更新數(shù)據(jù):

$sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";
if ($conn->query($sql) === TRUE) {
echo "更新成功";
} else {
echo "更新失敗: " . $conn->error;
}

刪除數(shù)據(jù):

$sql = "DELETE FROM MyGuests WHERE id=3";
if ($conn->query($sql) === TRUE) {
echo "刪除成功";
} else {
echo "刪除失敗: " . $conn->error;
}

總之,MySQL和PHP是一對強大的組合,可以用來管理和處理大量數(shù)據(jù)。上面的示例代碼只是介紹了一些基本操作,但在實際應(yīng)用中,我們還可以使用更為復(fù)雜的查詢語句和數(shù)據(jù)處理方式。