如何用PHP代碼實現(xiàn)MySQL數(shù)據(jù)庫的增刪改查

?php

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$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 "table border='1'

tr

thUsername/th

thPassword/th

/tr";

while($row = mysql_fetch_array($result)) {

echo "tr";

echo "td" . $row['username'] . "/td";

echo "td" . $row['password'] . "/td";

echo "/tr";

}

echo "/table";

mysql_close($con);

?

從服務(wù)器中獲取用戶所有信息（SQL SELECT語句）并以表格形式出現(xiàn)

?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);

?

刪除該用戶所有信息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);

?

注冊一個新用戶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);

?

修改一個用戶密碼update.php

html

head

titleFORM/title

/head

body

br /

h1Insert:/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 /

h1Delete/h1

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 /

h1Update/h1

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

以上三個功能的提交源Operate.html

php封裝一個class類，實現(xiàn)mysql數(shù)據(jù)庫的增刪改查怎么操做？

class sqlHelper{ \x0d\x0a public $conn; \x0d\x0a public $dbname="數(shù)據(jù)庫名稱"; \x0d\x0a public $username="數(shù)據(jù)庫用戶名"; \x0d\x0a public $password="數(shù)據(jù)庫密碼"; \x0d\x0a public $host="localhost"; \x0d\x0a //連接數(shù)據(jù)庫 \x0d\x0a public function __construct(){ \x0d\x0a $this-conn=mysql_connect($this-host,$this-username,$this-password); \x0d\x0a if(!$this-conn){ \x0d\x0a die("連接失敗".mysql_error()); \x0d\x0a } \x0d\x0a mysql_select_db($this-dbname,$this-conn); \x0d\x0a } \x0d\x0a //執(zhí)行查詢語句 \x0d\x0a public function execute_dql($sql){ \x0d\x0a $res=mysql_query($sql,$this-conn); \x0d\x0a return $res; \x0d\x0a } \x0d\x0a //執(zhí)行增填改語句 \x0d\x0a public function execute_dml($sql){ \x0d\x0a $b=mysql_query($sql,$this-conn); \x0d\x0a if(!$b){ \x0d\x0a return 3; \x0d\x0a }else{ \x0d\x0a if(mysql_affected_rows($this-conn)){ \x0d\x0a return 1;//表示OK \x0d\x0a }else{ \x0d\x0a return 2;//表示沒有行收到影響 \x0d\x0a } \x0d\x0a } \x0d\x0a }\x0d\x0a}

PHP怎么對多維數(shù)據(jù)進行增刪改查

你可以嵌套遍歷 在第二層遍歷的時候做一下數(shù)組的建名 當(dāng)?shù)扔谀愕哪繕?biāo)數(shù)組建名再做下一層的遍歷 為了代碼的高效 你也可以對該建名的數(shù)組判斷是否為空 如果為空就跳到下一次循環(huán)