php实现数据库增删查 php实现数据库增删改查
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\x0a public $conn; \x0d\x0a public $dbname="数据库名称"; \x0d\x0a public $username="数据库用户名"; \x0d\x0a public $password="数据库密码"; \x0d\x0a public $host="localhost"; \x0d\x0a //连接数据库 \x0d\x0a public function __construct(){ \x0d\x0a $this-conn=mysql_connect($this-host,$this-username,$this-password); \x0d\x0a if(!$this-conn){ \x0d\x0a die("连接失败".mysql_error()); \x0d\x0a } \x0d\x0a mysql_select_db($this-dbname,$this-conn); \x0d\x0a } \x0d\x0a //执行查询语句 \x0d\x0a public function execute_dql($sql){ \x0d\x0a $res=mysql_query($sql,$this-conn); \x0d\x0a return $res; \x0d\x0a } \x0d\x0a //执行增填改语句 \x0d\x0a public function execute_dml($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;//表示没有行收到影响 \x0d\x0a } \x0d\x0a } \x0d\x0a }\x0d\x0a}
成都创新互联公司网站建设服务商，为中小企业提供网站制作、网站建设服务，网站设计，网站改版维护等一站式综合服务型公司，专业打造企业形象网站，让您在众多竞争对手中脱颖而出成都创新互联公司。
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="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
以上三个功能的提交源Operate.html
有好心人能跟我说下php数据库的增删改查吗！谢谢
先select查询，返回的结果显示到表单中。 在update操作，将在表单中修改的结果更新到数据库中。 很容易的，用thinkphp做更容易。
php封装一个class类实现mysql数据库的增删该查
?php
class db{
private $db;
const MYSQL_OPT_READ_TIMEOUT = 11;
const MYSQL_OPT_WRITE_TIMEOUT = 12;
private $tbl_name;
private $where;
private $sort;
private $fields;
private $limit;
public static $_instance = null;
function __construct(){
$cfg = loadConfig('db');
$db = mysqli_init();
$db-options(self::MYSQL_OPT_READ_TIMEOUT, 3);
$db-options(self::MYSQL_OPT_WRITE_TIMEOUT, 1);
@$db-real_connect($cfg['host'],$cfg['user'],$cfg['pwd'],$cfg['db']);
if ($db-connect_error) {
$this-crash($db-errno,$db-error);
}
$db-set_charset("utf8");
$this-db = $db;
//echo $this-db-stat;
}
public static function getInstance(){
if(!(self::$_instance instanceof self)){
self::$_instance = new self();
}
return self::$_instance;
}
private function __clone() {} //覆盖__clone()方法，禁止克隆
public function find($conditions = null){
if($conditions) $this-where($conditions);
return $this-getArray($this-buildSql(),1);
}
public function findAll($conditions = null){
if($conditions) $this-where($conditions);
return $this-getArray($this-buildSql());
}
//表
public function t($table){ $this-tbl_name = $table; return $this;}
//条件
public function where($conditions){
$where = '';
if(is_array($conditions)){
$join = array();
foreach( $conditions as $key = $condition ){
$condition = $this-db-real_escape_string($condition);
$join[] = "`{$key}` = '{$condition}'";
}
$where = "WHERE ".join(" AND ",$join);
}else{
if(null != $conditions) $where = "WHERE ".$conditions;
}
$this-where = $where;
return $this;
}
//排序
public function sort($sort){
if(null != $sort) $sort = "ORDER BY {$sort}";
$this-sort = $sort;
return $this;
}
//字段
public function fields($fields){ $this-fields = $fields; return $this; }
public function limit($limit){$this-limit = $limit; return $this;}
private function buildSql(){
$this-fields = empty($this-fields) ? "*" : $this-fields;
$sql = "SELECT {$this-fields} FROM {$this-tbl_name} {$this-where} {$this-sort}";
accessLog('db_access',$sql);
if(null != $this-limit)$sql .= " limit {$this-limit}";
return $sql;
}
/**
* 返回查询数据
* @param $sql
* @param bool $hasOne
* @return array|bool|mixed
*/
private function getArray($sql,$hasOne = false){
if($this-db-real_query($sql) ){
if ($result = $this-db-use_result()) {
$row = array();
if($hasOne){
$row = $result-fetch_assoc();
}else{
while($d = $result-fetch_assoc()) $row[] = $d;
}
$result-close();
$this-fields = "*";
return $row;
}else{
return false;
}
}else{
if($this-db-error){
$this-crash($this-db-errno,$this-db-error,$sql);
}
}
}
public function findSql($sql,$hasOne = false){
accessLog('db_access',$sql);
if($this-db-real_query($sql) ){
if ($result = $this-db-use_result()) {
$row = array();
if($hasOne){
$row = $result-fetch_assoc();
}else{
while($d = $result-fetch_assoc()) $row[] = $d;
}
$result-close();
$this-fields = "*";
return $row;
}else{
return false;
}
}else{
if($this-db-error){
$this-crash($this-db-errno,$this-db-error,$sql);
}
}
}
public function create($row){
if(!is_array($row))return FALSE;
$row = $this-prepera_format($row);
if(empty($row))return FALSE;
foreach($row as $key = $value){
$cols[] = '`'.$key.'`';
$vals[] = "'".$this-db-real_escape_string($value)."'";
}
$col = implode(',', $cols);
$val = implode(',', $vals);
$sql = "INSERT INTO `{$this-tbl_name}` ({$col}) VALUES ({$val})";
accessLog('db_access',$sql);
if( FALSE != $this-db-query($sql) ){ // 获取当前新增的ID
if($this-db-insert_id){
return $this-db-insert_id;
}
if($this-db-affected_rows){
return true;
}
}
return FALSE;
}
//直接执行sql
public function runSql($sql){
accessLog('db_access',$sql);
if( FALSE != $this-db-query($sql) ){ // 获取当前新增的ID
return true;
}else{
return false;
}
}
public function update($row){
$where = "";
$row = $this-prepera_format($row);
if(empty($row))return FALSE;
foreach($row as $key = $value){
$value = $this-db-real_escape_string($value);
$vals[] = "`{$key}` = '{$value}'";
}
$values = join(", ",$vals);
$sql = "UPDATE {$this-tbl_name} SET {$values} {$this-where}";
accessLog('db_access',$sql);
if( FALSE != $this-db-query($sql) ){ // 获取当前新增的ID
if( $this-db-affected_rows){
return true;
}
}
return false;
}
function delete(){
$sql = "DELETE FROM {$this-tbl_name} {$this-where}";
if( FALSE != $this-db-query($sql) ){ // 获取当前新增的ID
if( $this-db-affected_rows){
return true;
}
}
return FALSE;
}
private function prepera_format($rows){
$columns = $this-getArray("DESCRIBE {$this-tbl_name}");
$newcol = array();
foreach( $columns as $col ){
$newcol[$col['Field']] = $col['Field'];
}
return array_intersect_key($rows,$newcol);
}
//崩溃信息
private function crash($number,$message,$sql=''){
$msg = 'Db Error '.$number.':'.$message ;
if(empty($sql)){
echo t('db_crash');
}else{
$msg .= " SQL:".$sql;
echo t('db_query_err');
}
accessLog('db_error',$msg);
exit;
}
}
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($num_rows 0){
while ($row = sqlsrv_fetch_array($query)){
echo $row['aaaa'];
}
}
其它的操作也同理，举一反三
求phpcms v9的数据库增删改查 是怎么实现的
phpcms v9是基于mvc模式开发的，所以我们按照其套路到模型层程序中去找就行。在/phpcms/model目录下存放着与数据表名称一致的模型成文件，随意打开一个，你会看到都继承了model这个类，那么找到它，路径：/phpcms/libs/classes/model.class.php。对于数据库的增删改查方法都在这里面了，列举如下：
insert() 增加数据、delete()删除指定条件数据、listinfo()读取支持翻页的多条数据、select()读取多条数据、update()更新数据。
当然，还有很多方法，以及各方法的传参各代表什么意义都有详细的注释看看就会明白的。
那么我们在控制器中应该如何引入一个数据表的model并对其进行数据操作呢，例如我在首页控制器中获取最近注册的10个会员账号信息，可以这么写：
$member_db = pc_base::load_model("members_model");
!--使用pc_base的load_model方法进行加载指定的数据表模型，感觉像TP3.2里的M()函数--
$member_list = $member_db-select(array('islock'=0),"*",10,"id desc");
!--使用对应的方法获取数据--
就演示到这里吧，如果有mvc架构基础应该一看就懂的，更多的关于phpcms的二次开发深入可以参考官方开发手册、代码中的注释说明以及iphpcms里的二次开发视频教程。
新闻标题：php实现数据库增删查 php实现数据库增删改查
转载来源：http://6mz.cn/article/dodsjji.html