Heim > Artikel > Backend-Entwicklung > Verwenden Sie PHP, um einfache Hinzufügungen, Löschungen, Änderungen und Abfragen in der Datenbank zu implementieren (reiner Code, verbesserungswürdig)
<?<span>php </span><span>$con</span> = <span>mysql_connect</span>("localhost:3306","root",""<span>); </span><span>if</span> (!<span>$con</span><span>) { </span><span>die</span>('Could not connect: ' . <span>mysql_error</span><span>()); } </span><span>mysql_select_db</span>("test", <span>$con</span><span>); </span><span>$result</span> = <span>mysql_query</span>("SELECT * FROM user"<span>); </span><span>echo</span> "<span><table border='1'> <tr> <th>Username</th> <th>Password</th> </tr>"<span>; </span><span>while</span>(<span>$row</span> = <span>mysql_fetch_array</span>(<span>$result</span><span>)) { </span><span>echo</span> "<tr>"<span>; </span><span>echo</span> "<td>" . <span>$row</span>['username'] . "</td>"<span>; </span><span>echo</span> "<td>" . <span>$row</span>['password'] . "</td>"<span>; </span><span>echo</span> "</tr>"<span>; } </span><span>echo</span> "</table>"<span>; </span><span>mysql_close</span>(<span>$con</span><span>); </span>?>Alle Benutzerinformationen (SQL SELECT-Anweisung) vom Server abrufen und in Tabellenform darstellen
<?<span>php </span><span>$con</span> = <span>mysql_connect</span>("localhost","root",""<span>); </span><span>if</span> (!<span>$con</span><span>) { </span><span>die</span>('Could not connect: ' . <span>mysql_error</span><span>()); } </span><span>mysql_select_db</span>("test", <span>$con</span><span>); </span><span>mysql_query</span>("DELETE FROM user WHERE username = '<span>$_POST</span>[username]'"<span>); </span><span>mysql_close</span>(<span>$con</span><span>); </span>?>Alle Informationen dieses Benutzers löschen delete.php
<?<span>php </span><span>$con</span> = <span>mysql_connect</span>("localhost:3306","root",""<span>); </span><span>if</span> (!<span>$con</span><span>) { </span><span>die</span>('Could not connect: ' . <span>mysql_error</span><span>()); } </span><span>mysql_select_db</span>("test", <span>$con</span><span>); </span><span>$sql</span> = "<span>INSERT INTO user (username,password) VALUES ('</span><span>$_POST</span>[username]','<span>$_POST</span>[password]')"<span>; </span><span>if</span> (!<span>mysql_query</span>(<span>$sql</span>,<span>$con</span><span>)) { </span><span>die</span>('Error: ' . <span>mysql_error</span><span>()); } </span><span>echo</span> "1 record added"<span>; </span><span>mysql_close</span>(<span>$con</span><span>); </span>?>Registrieren Sie einen neuen Benutzer insert.php
<?<span>php </span><span>$con</span> = <span>mysql_connect</span>("localhost","root",""<span>); </span><span>if</span> (!<span>$con</span><span>) { </span><span>die</span>('Could not connect: ' . <span>mysql_error</span><span>()); } </span><span>mysql_select_db</span>("test", <span>$con</span><span>); </span><span>mysql_query</span>("UPDATE user SET password = '<span>$_POST</span>[password]' WHERE username = '<span>$_POST</span>[username]'"<span>); </span><span>mysql_close</span>(<span>$con</span><span>); </span>?>Ändern Sie ein Benutzerpasswort update.php
<html> <head> <title>用PHP向数据库中实现简单的增删改查</title> </head> <body> <br /> <h1>Insert:</h1> <form action="insert.php" method="post"><span> username</span>:<input type="name" name="username"/> <br /><span> password</span>:<input type="password" name="password"/> <input type="submit" value="submit"/> </form> <br /><hr /><br /> <h1>Delete</h1> <form action="delete.php" method="post"><span> username</span>:<input type="name" name="username" /> <br /><span> Are you sure</span>?<input type="submit" value="sure" /> </form> <br /><hr /><br /> <h1>Update</h1> <form action="update.php" method="post"><span> username</span>:<input type="name" name="username"/> <br /><span> You want to change your password into</span>:<input type="password" name="password"/> <input type="submit" value="submit"/> </form> <br /><hr /><br /> </body> </html>Die Übermittlungsquelle für die oben genannten drei Funktionen Operate.html
Das Obige stellt die Verwendung von PHP zum Implementieren einfacher Hinzufügungen, Löschungen, Änderungen und Suchvorgänge in der Datenbank vor (reiner Code, der verbessert werden muss), einschließlich der relevanten Aspekte. Ich hoffe, dass es für Freunde hilfreich ist, die an PHP-Tutorials interessiert sind.