php怎么数据库增删改查 php添加数据库记录

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}
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数据库添加、删除、修改数据(mysql)一、PHP操作MySql数据库
新增数据
?php
$query
=
"INSERT
INTO
grade
(name,email,point,regdate)
VALUE
('
李三','yc60.com@gmail.com',,NOW())"
;
@mysql_query($query)
or
die(
'添加数据出错:'
.mysql_error());
?
修改数据
?php
$query
=
"UPDATE
grade
SET
name='小可爱'
WHERE
id=6"
;
@mysql_query($query)
or
die(
'修改出错:'
.mysql_error());
?
删除数据
?php
$query
=
"DELETE
FROM
grade
WHERE
id=6";
@mysql_query($query)
or
die(
'删除错误:'
.mysql_error());
?
显示数据
?php
$query
=
"SELECT
id,name,email,point
FROM
grade";
$result
=
@mysql_query($query)
or
die(
'查询语句出错:'
.mysql_error());
while
(!!
$row
=
mysql_fetch_array($result))
{
echo
$row[
'id'
].
'----'
.$row['name'
].'----'
.$row
['email'
].
'----'
.$row['point'
];
echo
'br
/
';
}
?
二、其他常用函数
mysql_f
etch_row()
:从结果集中取得一行作为枚举数组
mysql_f
etch_assoc()

从结果集中取得一行作为关联数组
mysql_f
etch_array()

从结果集中取得一行作为关联数组 , 或数字数组,或二者兼有
mysql_f
etch_lengths
()

取得结果集中每个输出的长度
mysql_f
ield_name():
取得结果中指定字段的字段名
mysql_num_rows():
取得结果集中行的数目
mysql_num_f
ields():取得结果集中字段的数目
mysql_get_client_inf
o()

取得
MySQL
客户端信息
mysql_get_host_info():
取得
MySQL
主机信息
mysql_get_proto_info():
取得
MySQL
协议信息
mysql_get_server_inf
o()

取得
MySQL
服务器信息
php怎么链接sqlserver数据库进行增删改查php有专门的sql server操作函数,举个简单的例子,是查询的
$serverName = "localhost"; //数据库服务器地址
$uid = "root"; //数据库用户名
$pwd = "123456"; //数据库密码
$connectionInfo = array("UID"=$uid, "PWD"=$pwd, "Database"='databasename');
$conn = sqlsrv_connect( $serverName, $connectionInfo);
if( $conn == false){
echo "连接数据库失败!";
die( print_r( sqlsrv_errors(), true));
}
$sql = "select * from user";
$query = sqlsrv_query( $conn, $sql , array(), array( "Scrollable" = SQLSRV_CURSOR_KEYSET ));
$num_rows = sqlsrv_num_rows($query);
if($num_rows0){
while ($row = sqlsrv_fetch_array($query)){
echo $row['aaaa'];
}
}
其它的操作也同理,举一反三
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