PHP5.5基于mysqli連接MySQL數(shù)據(jù)庫和讀取數(shù)據(jù)操作實(shí)例詳解

;extension=php_mysqli.dll

extension=php_mysqli.dll

?php
  /* Connect to a MySQL server 連接數(shù)據(jù)庫服務(wù)器 */
  $link = mysqli_connect(
        'localhost', /* The host to connect to 連接MySQL地址 */
        'user',   /* The user to connect as 連接MySQL用戶名 */
        'password', /* The password to use 連接MySQL密碼 */
        'world');  /* The default database to query 連接數(shù)據(jù)庫名稱*/
  if (!$link) {
    printf("Can't connect to MySQL Server. Errorcode: %s ", mysqli_connect_error());
    exit;
  }
  /* Send a query to the server 向服務(wù)器發(fā)送查詢請(qǐng)求*/
  if ($result = mysqli_query($link, 'SELECT Name, Population FROM City ORDER BY Population DESC LIMIT 5')) {
    //print("Very large cities are: ");
    /* Fetch the results of the query 返回查詢的結(jié)果 */
    while( $row = mysqli_fetch_assoc($result) ){
      printf("%s (%s) ", $row['Name'], $row['Population']);
    }
    /* Destroy the result set and free the memory used for it 結(jié)束查詢釋放內(nèi)存 */
    mysqli_free_result($result);
  }
  /* Close the connection 關(guān)閉連接*/
  mysqli_close($link);
?>

?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 創(chuàng)建連接
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
  die("連接失敗: " . $conn->connect_error);
}
$sql = "SELECT id, firstname, lastname 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"]. "br>";
  }
} else {
  echo "0 結(jié)果";
}
$conn->close();
?>

?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 創(chuàng)建連接
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
  die("連接失敗: " . mysqli_connect_error());
}
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
  // 輸出數(shù)據(jù)
  while($row = mysqli_fetch_assoc($result)) {
    echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "br>";
  }
} else {
  echo "0 結(jié)果";
}
mysqli_close($conn);
?>

?php
echo "table style='border: solid 1px black;'>";
echo "tr>th>Id/th>th>Firstname/th>th>Lastname/th>/tr>";
class TableRows extends RecursiveIteratorIterator {
  function __construct($it) {
    parent::__construct($it, self::LEAVES_ONLY);
  }
  function current() {
    return "td style='width:150px;border:1px solid black;'>" . parent::current(). "/td>";
  }
  function beginChildren() {
    echo "tr>";
  }
  function endChildren() {
    echo "/tr>" . "\n";
  }
}
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";
try {
  $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  $stmt = $conn->prepare("SELECT id, firstname, lastname FROM MyGuests");
  $stmt->execute();
  // 設(shè)置結(jié)果集為關(guān)聯(lián)數(shù)組
  $result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
  foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) {
    echo $v;
  }
}
catch(PDOException $e) {
  echo "Error: " . $e->getMessage();
}
$conn = null;
echo "/table>";
?>