php - How can I multiply a specific value from one table to another value from another table? -


i multiply value of bottle_price of bottle_type order_bottle store value receipt_bottle in sql using php.

tblproductinfo

bottle_type(pk)   bottle_stock   bottle_price   water_price     slim              10             150            25   mini slim           10             40             10

tblorderinfo

order_id(pk)    order_water    order_bottle    order_bottle_type(fk)    10001            2               2                   slim

tblreceiptinfo

receipt_id(pk)   receipt_water   receipt_bottle   receipt_total 

<!doctype html>  <html>  <head>  <title>aqua serv water station</title>  </head>  <body>  <?php  	function receiptid(){  		$db = mysqli_connect('localhost', 'root', '', 'waterstationdb')  		or die ('could not connect database server' . mysqli_connect_error());  		  		$companyname = "aq-";  		$receipttype = "receipt-";  		$tempidnumber = 10001;  		  		$query = "select count(*) tblreceiptinfo";  		$result = mysqli_query($db, $query)  		or die('error querying database.');  		$row = mysqli_fetch_array($result);  		  		$increment = $row['count(*)'];  		$incrementid = $increment + $tempidnumber;  		  		$receiptidnumber = $companyname . $receipttype . $incrementid;  	  		mysqli_close($db);  		return $receiptidnumber;  	}  	  	$strreceiptid = receiptid();  	  	function bottleprice(){  		$db = mysqli_connect('localhost', 'root', '', 'waterstationdb')  		or die ('could not connect database server' . mysqli_connect_error());  		  		$query = "select intprodwater tblproductinfo";  		$result = mysqli_query($db, $query)  		or die('error querying database.');  		$row = mysqli_fetch_array($result);  		  		$query1 = "select intorderwater tblorderinfo";  		$result1 = mysqli_query($db, $query1)  		or die('error querying database.');  		$row1 = mysqli_fetch_array($result1);  		  		$query2 = mysqli_query($db, "update tblreceiptinfo set intreceiptwater = intprodwater * intorderwater");  		  	}  	  	$intreceiptwater = bottleprice();  ?>  <table align="center" bgcolor="#sky blue" border="0" cellpadding="0" cellspacing="1" width="300">  <tr>      <td align="center"><strong></br></br>receipt invoice</br></br></br></strong></td>  </tr>      <tr>      <td>      <form method="post" name="">  	<table bgcolor="#ffffff" border="0" cellpadding="3" cellspacing="1" width="300">      <tr>          <td width="300">receipt id</td>          <td width="6">:</td>  		<td><input type="text" size="20" readonly name="strreceiptid" value="<?php echo $strreceiptid?>"></td>      </tr>      <tr>          <td>water price</td>          <td>:</td>          <td><input type="text" size="20" readonly name="intreceiptwater" value="<?php echo $intreceiptwater?>"></td>      </tr>  	<tr>          <td>bottle price</td>  		<td>:</td>  		<td><input type="text" size="20" readonly></td>      </tr>  	<tr>          <td>total price</td>          <td>:</td>          <td><input type="text" size="20" readonly name="intreceipttotal"></td>      </tr>  	<tr>  		<td>&nbsp;</td>	  		<td>&nbsp;</td>	  		<td><input name="btndone" type="submit" value="done"></td>  	</tr>  </table>  </form>  </td>  </tr>  </table>  <?php   	if (isset($_post['btndone']))          {       		echo "<script language='javascript' type='text/javascript'> location.href='refillermenu.php' </script>";    		}  ?>  </body>  </html>

function bottleprice() code wanted multiply values im pretty sure wrong lol

there few ways accomplish trying do.

you can directly use sql product of bottle_price * order_bottle using like:

select   (t1.bottle_price * t2.order_bottle) bottle_price tblproductinfo t1 join tblorderinfo t2   on t1.bottle_type = t2.order_bottle_type ;

you can use value query update tblreceiptinfo table if have record receipt want update. if creating new record tblreceiptinfo have use insert sql statement.


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