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php中数据库的增删改查 php增删改查mysql实例

IT技术数据库

如何用PHP代码实现MySQL数据库的增删改查?php
$con = mysql_connect("localhost:3306","root","");
if (!$con) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db("test", $con);
$result = mysql_query("SELECT * FROM user");
echo "table border='1'
tr
thUsername/th
thPassword/th
/tr";
while($row = mysql_fetch_array($result)) {
echo "tr";
echo "td" . $row['username'] . "/td";
echo "td" . $row['password'] . "/td";
echo "/tr";
}
echo "/table";
mysql_close($con);
?
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
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="https://www.04ip.com/post/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="https://www.04ip.com/post/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="https://www.04ip.com/post/submit"/
/form
br /hr /br /
/body
/html
以上三个功能的提交源Operate.html
php封装一个class类，实现mysql数据库的增删改查怎么操做？class sqlHelper{\x0d\x0apublic $conn;\x0d\x0apublic $dbname="数据库名称";\x0d\x0apublic $username="数据库用户名";\x0d\x0apublic $password="数据库密码";\x0d\x0apublic $host="localhost";\x0d\x0a//连接数据库\x0d\x0apublic function __construct(){\x0d\x0a$this-conn=mysql_connect($this-host,$this-username,$this-password);\x0d\x0aif(!$this-conn){\x0d\x0adie("连接失败".mysql_error());\x0d\x0a}\x0d\x0amysql_select_db($this-dbname,$this-conn);\x0d\x0a}\x0d\x0a//执行查询语句\x0d\x0apublic function execute_dql($sql){\x0d\x0a$res=mysql_query($sql,$this-conn);\x0d\x0areturn $res;\x0d\x0a}\x0d\x0a//执行增填改语句\x0d\x0apublic function execute_dml($sql){\x0d\x0a$b=mysql_query($sql,$this-conn);\x0d\x0aif(!$b){\x0d\x0areturn 3;\x0d\x0a}else{\x0d\x0aif(mysql_affected_rows($this-conn)){\x0d\x0areturn 1;//表示OK\x0d\x0a}else{\x0d\x0areturn 2;//表示没有行收到影响\x0d\x0a}\x0d\x0a}\x0d\x0a}\x0d\x0a}
php 如何操作access数据库，关于增删改查的四种操作resourse
odbc_connect(
string
dsn,
string
user,
string

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