用php向数据库中实现简单的增删改查（纯代码，待完善），php增删 
php $con = mysql_connect(localhost:3306,root,); if (!$con) { die('could not connect: ' . mysql_error()); } mysql_select_db(test, $con); $result = mysql_query(select * from user); echo username password
; while($row = mysql_fetch_array($result)) { echo ; echo . $row['username'] . ; echo . $row['password'] . ; echo
; } echo
; mysql_close($con);?>从服务器中获取用户所有信息（sql select语句）并以表格形式出现 
php $con = mysql_connect(localhost,root,); if (!$con) { die('could not connect: ' . mysql_error()); } mysql_select_db(test, $con); mysql_query(delete from user where username = '$_post[username]'); mysql_close($con);?>删除该用户所有信息delete.php 
php $con = mysql_connect(localhost:3306,root,); if (!$con) { die('could not connect: ' . mysql_error()); } mysql_select_db(test, $con); $sql = insert into user (username,password) values ('$_post[username]','$_post[password]'); if (!mysql_query($sql,$con)) { die('error: ' . mysql_error()); } echo 1 record added; mysql_close($con);?>注册一个新用户insert.php 
php $con = mysql_connect(localhost,root,); if (!$con) { die('could not connect: ' . mysql_error()); } mysql_select_db(test, $con); mysql_query(update user set password = '$_post[password]' where username = '$_post[username]'); mysql_close($con);?>修改一个用户密码update.php 
html> head> title>formtitle> head> body> br /> h1>insert:h1> form action=insert.php method=post> username:input type=name name=username/> br /> password:input type=password name=password/> input type=submit value=submit/> form> br />hr />br /> h1>deleteh1> form action=delete.php method=post> username:input type=name name=username /> br /> are you sure?input type=submit value=sure /> form> br />hr />br /> h1>updateh1> form action=update.php method=post> username:input type=name name=username/> br /> you want to change your password into:input type=password name=password/> input type=submit value=submit/> form> br />hr />br /> body>html>以上三个功能的提交源operate.html
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