Creating a Dynamic MySQLi Bind
I am a newbie to MySQLi and am trying out some simple examples.
So I have this code:-
This works fine. However I am trying to create the facility to be able to also run the select on the whale table without the AND, but I can't find a way of doing this as when I try and add the second comma conditionally it fails to work. I was hoping I could build a statement to bind where I could make the latter half and second variable type null such as:-
... but it doesn't work (I tried adding quotes round the variable type too using \" ) but to no avail. Any ideas anyone?
So I have this code:-
<?php
require "conMushingDB.php";
if (!isset($sqlDeleted)) {
$sqlDeleted = '0 ';
}
$arrAddressWHERE = array('Address_Id',2);
$objAddress = $mysqli->prepare("SELECT * FROM address WHERE Deleted = ?" . $strSQLAND);
$objAddress->bind_param("i", $arrAddressWHERE[1]);
$objAddress->bind_param("i" . $arrAddressField[$arrAddressWHERE[0]], $sqlDeleted , $arrAddressWHERE[1]);
?>This works fine. However I am trying to create the facility to be able to also run the select on the whale table without the AND, but I can't find a way of doing this as when I try and add the second comma conditionally it fails to work. I was hoping I could build a statement to bind where I could make the latter half and second variable type null such as:-
$strBind = "i" . $arrAddressField[$arrAddressWHERE[0]] . ", " . $sqlDeleted . $strComma . $arrAddressWHERE[1];
$objAddress->bind_param($strBind );... but it doesn't work (I tried adding quotes round the variable type too using \" ) but to no avail. Any ideas anyone?
Not sure what you're after but the bind_param method takes 2 or more arguments. The first is a list of types and the remaining arguments are the values for those types. The types parameter indicates whether you are passing in integer / string etc, and you must follow this up with the correct number of values, so if your types argument is 4 character ("isss" for example), then the bind_param method must take 5 arguments - 1 for the types and 4 for the values
$stmt->bind_param("isss", $intValue, $strValue1, $strValue2, $strValue4);
In your code, you seem to concatenating a series of strings into one variable and then passing that into bind_param, which clearly won't work.
$stmt->bind_param("isss", $intValue, $strValue1, $strValue2, $strValue4);
In your code, you seem to concatenating a series of strings into one variable and then passing that into bind_param, which clearly won't work.
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Thanks @gr8gonzo and @Chris Stanyon for responding. @gr8gonzo you're code and comments are a great insight. I take your point about the lock down. I'm not sure I would use this in a real life situation but I wanted to explore.
At first glance, it looks like you're trying to create programmatic bindings using just a string like this:
$strBind = "ii, 0, 2";
$objAddress->bind_param($s
...but "ii, 0, 2" is just a single string - it is not several different values, even if you add commas.
If you want to call bind_param with a dynamic number of parameters, I'm not sure off the top of my head if there's any way to do it directly, but you could probably use call_user_func() to call it with the number of parameters you want.