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Database connect formulieren 1 februari 2016
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Example – show data in the tables
Function: list all tables in your database. Users can select one of tables, and show all contents in this table. second.php showtable.php Mysqli = depreciated PDO-CONNECT
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second.php <html><head><title>MySQL Table Viewer</title></head><body> <?php // change the value of $dbuser and $dbpass to your username and password $dbhost = 'hercules.cs.kent.edu:3306'; $dbuser = 'nruan'; $dbpass = ‘*****************’; $dbname = $dbuser; $table = 'account'; $conn = mysqli_connect($dbhost, $dbuser, $dbpass); if (!$conn) { die('Could not connect: ' . mysqli_error()); } if (!mysqli_select_db($dbname)) die("Can't select database");
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second.php (cont.) $result = mysql_query("SHOW TABLES");
if (!$result) { die("Query to show fields from table failed"); } $num_row = mysqli_num_rows($result); echo "<h1>Choose one table:<h1>"; echo "<form action=\"showtable.php\" method=\"POST\">"; echo "<select name=\"table\" size=\"1\" Font size=\"+2\">"; for($i=0; $i<$num_row; $i++) { $tablename=mysqli_fetch_row($result); echo "<option value=\"{$tablename[0]}\" >{$tablename[0]}</option>"; echo "</select>"; echo "<div><input type=\"submit\" value=\"submit\"></div>"; echo "</form>"; mysqli_free_result($result); mysqli_close($conn); ?> </body></html>
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showtable.php <html><head>
<title>MySQL Table Viewer</title> </head> <body> <?php $dbhost = 'hercules.cs.kent.edu:3306'; $dbuser = 'nruan'; $dbpass = ‘**********’; $dbname = 'nruan'; $table = $_POST[“table”]; $conn = mysqli_connect($dbhost, $dbuser, $dbpass); if (!$conn) die('Could not connect: ' . mysql_error()); if (!mysqli_select_db($dbname)) die("Can't select database"); $result = mysqli_query("SELECT * FROM {$table}"); if (!$result) die("Query to show fields from table failed!" . mysqli_error());
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showtable.php (cont.) $fields_num = mysql_num_fields($result);
echo "<h1>Table: {$table}</h1>"; echo "<table border='1'><tr>"; // printing table headers for($i=0; $i<$fields_num; $i++) { $field = mysqli_fetch_field($result); echo "<td><b>{$field->name}</b></td>"; } echo "</tr>\n"; while($row = mysqli_fetch_row($result)) { echo "<tr>"; // $row is array... foreach( .. ) puts every element // of $row to $cell variable foreach($row as $cell) echo "<td>$cell</td>"; mysqli_free_result($result); mysqli_close($conn); ?> </body></html>
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Functions Covered mysqli_connect() mysqli_select_db() include()
mysqli_query() mysqli_num_rows() mysqli_fetch_array() mysqli_close()
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PDO-connect voorbeeld
try { $dbh = new PDO('mysql:host=‘localhost’;dbname=werknemers', $user, $password); // read rows from select statement foreach($dbh->query('SELECT * from werknemers') as $row) { // show results echo "<tr> <td>$row[id]</th> <td>$row[voornaam]</th> <td>$row[achternaam]</th> <td>$row[kamer]</th> <td>$row[toestel]</th> </tr>"; } $dbh = null;
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PDO-connect // PDO connect Try { .. } catch (PDOException $e) {
print "Error!: " . $e->getMessage() . "<br/>"; die(); }
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PDO-connect MYSQLi-connect is feitelijk alleen voor MYSQL databases maar wat nu indien je het programma PHP wilt behouden en een andere database engine wilt benaderen? PDO-connect is database onafhankelijk zodat je een minimale aanpassing hebt. <?php $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); ?> $dbh = de verbinding naar de database bakker 2016
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PDO-connect <?php // variabelen $host = ‘localhost’;
$database=‘test’; $user = ‘root’; $pass = ‘ ’; $dbh = new PDO(“mysql:host=$host;dbname=$database”, $user, $pass); ?> Om een verbinding te maken heb je nodig: Host Database User Password $dbh is een object ook wel DataBaseHandler genoemd bakker 2016
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PDO-connect <?php // variabelen $host = ‘localhost’;
$database=‘test’; $user = ‘root’; $pass = ‘ ’; $dbh = new PDO(“mysql:host=$host;dbname=$database”, $user, $pass); ?> Met de verbinding ga je verbinden naar de tabel $dbh->query('SELECT * from FOO’) $query = “SELECT * from FOO”; $dbh->query($query) // dit geeft een aantal rijen PDO::query bakker 2016
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PDO-connect Try en Catch
Een database kan een connectie fout geven waardoor het programma ‘hangt’. <?php try { $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); foreach($dbh->query('SELECT * from FOO') as $row) { print_r($row); } $dbh = null; } catch (PDOException $e) { print "Error!: " . $e->getMessage() . "<br/>"; die(); } ?> bakker 2016
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PDO-connect Foreach Regel voor regel ophalen en verwerken
$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); foreach($dbh->query('SELECT * from FOO') as $row) { print $row[‘voornaam'] . "\t"; print $row[‘achternaam'] . "\t"; print $row[‘telefoon'] . "\n"; print_r($row); } bakker 2016
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PDO-connect While Is er wel iets gevonden, test op $row blijf verwerken $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); $query=“Select vn, an from users”; $qres = $dbh->prepare($query); $qres->execute($query); while ( $row = $qres->fetch() ) { print_r($row); } bakker 2016
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PDO-connect For In een lus afvragen van het resultaat
$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); $qres = $dbh->prepare("select name FROM tbl_name"); $qres->execute(); For ( $i=0; $row = $qres->fetch(); $i++) { echo $i." - ".$row['name']."<br/>"; } bakker 2016
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PDO-connect PDO variabelen doorgeven
Doorgeven van variabelen in een querystring $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); $t1 = ‘voornaam’; $t2 = ‘achternaam’; $t3 = ‘ ’; $qres = $dbh->query("SELECT * FROM table_users WHERE voornaam=? AND achternaam=? AND =?",$t1,$t2,$t3); while ($row = $qres->fetch()) { print_r($row); } bakker 2016
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PDO-connect PDO setattribute Opties die je kunt gebruiken
$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT); PDO::ATTR_ERRMODE = foutmelding afhandeling PDO::ERRMODE_SILENT = Geen foutmelding van de database Dus geen melding op print "Error!: " . $e->getMessage() . "<br/>"; bakker 2016
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PDO-connect PDO setattribute Opties die je kunt gebruiken
$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); $dbh->setAttribute(PDO::ATTR_TIMEOUT, 30); Geef de database 30 seconden te tijd om met een resultaat te komen $dbh->setAttribute(PDO::ATTR_PERSISTENT , TRUE); Verbinding behouden en niet verbreken bakker 2016
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PDO-connect PDO attribute Opties die je kunt gebruiken PDO::ATTR_CASE
PDO::ATTR_ERRMODE PDO::ATTR_ORACLE_NULLS PDO::ATTR_STRINGIFY_FETCHES PDO::ATTR_STATEMENT_CLASS PDO::ATTR_TIMEOUT PDO::ATTR_AUTOCOMMIT PDO::ATTR_EMULATE_PREPARES PDO::MYSQL_ATTR_USE_BUFFERED_QUERY PDO::ATTR_DEFAULT_FETCH_MODE Bron: bakker 2016
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Mysqli versus PDO connect
bakker 2016
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Mysqli versus PDO connect
bakker 2016
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Mysqli versus PDO connect
bakker 2016
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Mysqli versus PDO connect
bakker 2016
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Mysqli versus PDO connect
bakker 2016
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Mysqli versus PDO connect
bakker 2016
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