php数据表和字段 php数据库函数
php mysqli 列出所有表和字段
$mysqli = new mysqli('localhost','my_user','my_password','world');//连接数据库,需要换成对应的主机名,用户名,密码,数据库名
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$result = $mysqli-query('SHOW TABLES');//执行查询语句
$tables=array();
while($arr = $result-fetch_assoc()){
$tables[]=$arr;//遍历查询结果
}
$result = $mysqli-query('DESCRIBE table_name');//table_name 换成你对应的表名
$column=array();
while($arr = $result-fetch_assoc()){
$column[]=$arr;
}
echo 'pre';
var_dump($tables);//输出所有表
var_dump($column);//输出所有字段
上面的例子没有对应的错误判断,大概思路是这样.
请教关于PHP购物车代码的数据库表和字段
PHP Code
div id="products-wrapper"
h1Products/h1
div class="products"
?php
//current URL of the Page. cart_update.php redirects back to this URL
$current_url = base64_encode($url="http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
$results = $mysqli-query("SELECT * FROM cart ORDER BY id ASC");
if ($results) {
//fetch results set as object and output HTML
while($obj = $results-fetch_object())
{
echo 'div class="product"';
echo 'form method="post" action="cart_update.php"';
echo 'div class="product-thumb"img src="images/'.$obj-product_img_name.'"/div';
echo 'div class="product-content"h3'.$obj-product_name.'/h3';
echo 'div class="product-desc"'.$obj-product_desc.'/div';
echo 'div class="product-info"';
echo 'Price '.$currency.$obj-price.' | ';
echo 'Qty input type="text" name="product_qty" value="1" size="3" /';
echo 'button class="add_to_cart"Add To Cart/button';
echo '/div/div';
echo 'input type="hidden" name="product_code" value="'.$obj-product_code.'" /';
echo 'input type="hidden" name="type" value="add" /';
echo 'input type="hidden" name="return_url" value="'.$current_url.'" /';
echo '/form';
echo '/div';
}
}
?
/div
div class="shopping-cart"
h2Your Shopping Cart/h2
?php
if(isset($_SESSION["products"]))
{
$total = 0;
echo 'ol';
foreach ($_SESSION["products"] as $cart_itm)
{
echo 'li class="cart-itm"';
echo 'span class="remove-itm"a href="cart_update.php?removep='.$cart_itm["code"].'return_url='.$current_url.'"×/a/span';
echo 'h3'.$cart_itm["name"].'/h3';
echo 'div class="p-code"P code : '.$cart_itm["code"].'/div';
echo 'div class="p-qty"Qty : '.$cart_itm["qty"].'/div';
echo 'div class="p-price"Price :'.$currency.$cart_itm["price"].'/div';
echo '/li';
$subtotal = ($cart_itm["price"]*$cart_itm["qty"]);
$total = ($total + $subtotal);
}
echo '/ol';
echo 'span class="check-out-txt"strongTotal : '.$currency.$total.'/strong a href="view_cart.php"Check-out!/a/span';
echo 'span class="empty-cart"a href="cart_update.php?emptycart=1return_url='.$current_url.'"Empty Cart/a/span';
}else{
echo 'Your Cart is empty';
}
?
/div
cart_update.php
PHP Code
?php
session_start();
include_once("config.php");
//empty cart by distroying current session
if(isset($_GET["emptycart"]) $_GET["emptycart"]==1)
{
$return_url = base64_decode($_GET["return_url"]); //return url
session_destroy();
header('Location:'.$return_url);
}
//add item in shopping cart
if(isset($_POST["type"]) $_POST["type"]=='add')
{
$product_code = filter_var($_POST["product_code"], FILTER_SANITIZE_STRING); //product code
$product_qty = filter_var($_POST["product_qty"], FILTER_SANITIZE_NUMBER_INT); //product code
$return_url = base64_decode($_POST["return_url"]); //return url
//limit quantity for single product
if($product_qty 10){
die('div align="center"This demo does not allowed more than 10 quantity!br /a href=""Back To Products/a./div');
}
//MySqli query - get details of item from db using product code
$results = $mysqli-query("SELECT product_name,price FROM cart WHERE product_code='$product_code' LIMIT 1");
$obj = $results-fetch_object();
if ($results) { //we have the product info
//prepare array for the session variable
$new_product = array(array('name'=$obj-product_name, 'code'=$product_code, 'qty'=$product_qty, 'price'=$obj-price));
if(isset($_SESSION["products"])) //if we have the session
{
$found = false; //set found item to false
foreach ($_SESSION["products"] as $cart_itm) //loop through session array
{
if($cart_itm["code"] == $product_code){ //the item exist in array
$product[] = array('name'=$cart_itm["name"], 'code'=$cart_itm["code"], 'qty'=$product_qty, 'price'=$cart_itm["price"]);
$found = true;
}else{
//item doesn't exist in the list, just retrive old info and prepare array for session var
$product[] = array('name'=$cart_itm["name"], 'code'=$cart_itm["code"], 'qty'=$cart_itm["qty"], 'price'=$cart_itm["price"]);
}
}
if($found == false) //we didn't find item in array
{
//add new user item in array
$_SESSION["products"] = array_merge($product, $new_product);
}else{
//found user item in array list, and increased the quantity
$_SESSION["products"] = $product;
}
}else{
//create a new session var if does not exist
$_SESSION["products"] = $new_product;
}
}
//redirect back to original page
header('Location:'.$return_url);
}
//remove item from shopping cart
if(isset($_GET["removep"]) isset($_GET["return_url"]) isset($_SESSION["products"]))
{
$product_code = $_GET["removep"]; //get the product code to remove
$return_url = base64_decode($_GET["return_url"]); //get return url
foreach ($_SESSION["products"] as $cart_itm) //loop through session array var
{
if($cart_itm["code"]!=$product_code){ //item does,t exist in the list
$product[] = array('name'=$cart_itm["name"], 'code'=$cart_itm["code"], 'qty'=$cart_itm["qty"], 'price'=$cart_itm["price"]);
}
//create a new product list for cart
$_SESSION["products"] = $product;
}
//redirect back to original page
header('Location:'.$return_url);
}
?
view_cart.php
PHP Code
div class="view-cart"
?php
$current_url = base64_encode($url="http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
if(isset($_SESSION["products"]))
{
$total = 0;
echo 'form method="post" action="paypal-express-checkout/process.php"';
echo 'ul';
$cart_items = 0;
foreach ($_SESSION["products"] as $cart_itm)
{
$product_code = $cart_itm["code"];
$results = $mysqli-query("SELECT product_name,product_desc, price FROM cart WHERE product_code='$product_code' LIMIT 1");
$obj = $results-fetch_object();
echo 'li class="cart-itm"';
echo 'span class="remove-itm"a href="cart_update.php?removep='.$cart_itm["code"].'return_url='.$current_url.'"×/a/span';
echo 'div class="p-price"'.$currency.$obj-price.'/div';
echo 'div class="product-info"';
echo 'h3'.$obj-product_name.' (Code :'.$product_code.')/h3 ';
echo 'div class="p-qty"Qty : '.$cart_itm["qty"].'/div';
echo 'div'.$obj-product_desc.'/div';
echo '/div';
echo '/li';
$subtotal = ($cart_itm["price"]*$cart_itm["qty"]);
$total = ($total + $subtotal);
echo 'input type="hidden" name="item_name['.$cart_items.']" value="'.$obj-product_name.'" /';
echo 'input type="hidden" name="item_code['.$cart_items.']" value="'.$product_code.'" /';
echo 'input type="hidden" name="item_desc['.$cart_items.']" value="'.$obj-product_desc.'" /';
echo 'input type="hidden" name="item_qty['.$cart_items.']" value="'.$cart_itm["qty"].'" /';
$cart_items ++;
}
echo '/ul';
echo 'span class="check-out-txt"';
echo 'strongTotal : '.$currency.$total.'/strong ';
echo '/span';
echo '/form';
}else{
echo 'Your Cart is empty';
}
?
/div
/div
php+sql：数据表与字段关联的问题，在线等！
select c.name from category as c left join article as a on c.cid = a.cid
你是想要联合查询吧 这sql里是两个表用左连接 根据 两个表共有的 cid字段 进行查询的 查到的结果就是 category表的name字段 也可以吧 c.name 换成其他字段或者*
望采纳！
用PHP怎么给数据库的表中添加字段
mysql_connect("localhost","root","") or die("登陆数据库失败");
mysql_select_db("iPad") or die("连接数据库失败");
mysql_query("set names utf8");
$sql = "ALTER TABLE `表名` ADD `字段名` 数据类型";
mysql_query($sql);
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