MySQL是一種廣泛使用的開源關(guān)系型數(shù)據(jù)庫管理系統(tǒng)，它被廣泛應(yīng)用于Web應(yīng)用程序中。本文將介紹一些業(yè)務(wù)場景中MySQL的應(yīng)用。

//連接MySQL數(shù)據(jù)庫
$conn = mysqli_connect("localhost", "root", "password", "database");
if (!$conn) {
die("連接數(shù)據(jù)庫失敗：" . mysqli_connect_error());
}
//查詢數(shù)據(jù)
$sql = "SELECT * FROM users WHERE age >18";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) >0) {
while ($row = mysqli_fetch_assoc($result)) {
echo "名字：" . $row["username"] . ", 年齡：" . $row["age"] . "
";
}
} else {
echo "沒有符合條件的數(shù)據(jù)";
}
//插入數(shù)據(jù)
$sql = "INSERT INTO users (username, age, email) VALUES ('test', 20, 'test@test.com')";
if (mysqli_query($conn, $sql)) {
echo "插入數(shù)據(jù)成功";
} else {
echo "插入數(shù)據(jù)失敗：" . mysqli_error($conn);
}
//更新數(shù)據(jù)
$sql = "UPDATE users SET age=21 WHERE username='test'";
if (mysqli_query($conn, $sql)) {
echo "更新數(shù)據(jù)成功";
} else {
echo "更新數(shù)據(jù)失敗：" . mysqli_error($conn);
}
//刪除數(shù)據(jù)
$sql = "DELETE FROM users WHERE username='test'";
if (mysqli_query($conn, $sql)) {
echo "刪除數(shù)據(jù)成功";
} else {
echo "刪除數(shù)據(jù)失敗：" . mysqli_error($conn);
}
//關(guān)閉連接
mysqli_close($conn);

MySQL的應(yīng)用非常廣泛，不僅可以用于數(shù)據(jù)存儲，還可以用于數(shù)據(jù)分析、數(shù)據(jù)挖掘、業(yè)務(wù)流程等。在實際應(yīng)用過程中，需要根據(jù)具體業(yè)務(wù)需求靈活地使用MySQL。