I'm using php to retrieve long text files from a mysql database. These files are pdfs encoded into base64 strings. The strings work perfectly fine in the database and produce the pdf I desire, but when I retrieve the data through php there is always a large block of characters missing in the middle of the string.
I've tried this with multiple different strings and it keeps giving me the same result, a large block of characters missing in the middle of the string. Any help would be appreciated.
Here is the code I'm using, my mistake. At the moment I'm just printing the string onto the screen.
<?php
// Make sure an ID was passed
if(isset($_GET['id'])) {
// Get the ID
$id = intval($_GET['id']);
// Make sure the ID is in fact a valid ID
if($id <= 0) {
die('The ID is invalid!');
}
else {
// Connect to the database
$dbLink = new mysqli('***', '***', '***', '***');
if(mysqli_connect_errno()) {
die("MySQL connection failed: ". mysqli_connect_error());
}
// Fetch the file information
$query = "SELECT name, data FROM report_storage WHERE `id` = {$id}";
$result = $dbLink->query($query);
if($result) {
// Make sure the result is valid
if($result->num_rows == 1) {
// Get the row
$row = mysqli_fetch_assoc($result);
// Print headers
// Print data
$data = $row['data'];
//echo strlen($data);
echo $data;
}
else {
echo 'Error! No image exists with that ID.';
}
// Free the mysqli resources
#mysqli_free_result($result);
}
else {
echo "Error! Query failed: <pre>{$dbLink->error}</pre>";
}
#mysqli_close($dbLink);
}
}
else {
echo 'Error! No ID was passed.';
}
?>
Related
When I run the page with an empty database, it will insert the data correctly. When I run the page again, it displays there is already an ID in the database, but it inserts it anyway. Not sure how or why but I've tried every combination of booleans inside the if statements and cant get it to chooch correctly.
//pass in an ID to compare:
function checkOrderID($orderID) {
//Connect to the database:
$mysqli = new mysqli("localhost", "root", "", "price");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
//Ask the database for some sweet, sweet data:
$stmt1 = "SELECT orderID FROM orders";
$result = $mysqli->query($stmt1);
//flag (we want to believe that there are no similar IDS so lets make it true):
$flag = true;
//while we got some data, display that shit
while ($row = $result->fetch_assoc()) {
//asign data to variable:
$rowOrderID = $row['orderID'];
//Does it match? if it does set the flag to false so it doesnt get inserted.
if ($rowOrderID == $orderID) {
echo "Row ID" . $row["orderID"] . " Passed ID: " . $orderID . "<br>";
echo "This order is already in the database" . "<br>";
$flag = false;
}
}
//hand the flag over to who ever needs it
return flag;
}
.
if (checkOrderID($orderID) == true) {
//some mysql insert logic here
}
Why are you making this complicated. just do something like this:
$con=mysqli_connect("localhost","root","","price");
$check_query = mysqli_query($con,"SELECT * FROM orders WHERE orderID = $orderID");
if (mysqli_num_rows($check_query) == 0) {
//mysql insert logic here
}
(Noted of course you are going to have your connection logic as well)
Note: You are using Mysqli in object oriented manner but in this example i have not used object oriented manner of DB connection. The connection variable $con must be passed to mysqli_query() method.
Also... random side note, but it's generally a good idea to have a password for your root mysql user.
Here better and short, but please try to use DB connection globally not inside your mothod and try to use prepared statements. But except those you can use following code.
//pass in an ID to compare:
function checkOrderID($orderID) {
//Connect to the database: I suggest use global DB connection
$mysqli = new mysqli("localhost", "root", "", "price");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
//gets recodrs based on $orderID passed to this method
$stmt1 = "SELECT * FROM orders where orderID=$orderID"; //Try to use prepared statement
$result = $mysqli->query($stmt1);
//Store number of rows found
$row_count = $result->num_rows;
if($row_count>0){
return true;
}
else{
return false;
}
}
I've tried like twenty times and the closest I got was when I put in a variable stored in row 1 of the db and it returned the content the last row in the db. Any clarity would be extremely helpful. Thanks.
// Create connection
$coco = mysqli_connect($server, $user, $pass, $db);
// Check connection
if (!$coco) { die("Connection failed: " . mysqli_connect_error()); }
// Start SQL Query
$grabit = "SELECT title, number FROM the_one WHERE title = 'on' AND (number = 'two' OR number='0')";
$result = mysqli_query($coco, $grabit);
// What I need it to do
if (mysqli_num_rows($result) > 0) {
while($row = mysqli_fetch_assoc($result)) {
$titleit = $row["title"];
$placeit = $row["number"];
$incoming = 'Help';
if ($titleit[$_REQUEST[$incoming]]){
$message = strip_tags(substr($placeit,0,140));
}
echo $message;
}
} else {
echo "not found";
}
mysqli_close($coco);
Put the input that you want to match into the WHERE clause of the query, rather than selecting everything and then testing it in PHP.
$incoming = mysqli_real_escape_string($coco, $_POST['Help']));
$grabit = "SELECT number FROM the_one WHERE title = '$incoming' AND number IN ('two', '0')";
$result = mysqli_query($coco, $grabit);
if (mysqli_num_rows($result) > 0) {
while ($row = mysqli_fetch_assoc($result)) {
echo $row['number'];
}
} else {
echo "not found";
}
I think you need to add a break; in that if or I would assume it would go through each row in the database and set message if it matches the conditional. Unless you want the last entry that matches...if not you should debug:
if ($titleit[$_REQUEST[$incoming]]){
// set message
}
and see when it's getting set. That may not be the issue, but it's at least a performance thing and could explain getting the last entry
Have you tried print_r($row) to see the row or adding echos to the if/else to see what path it's taking?
I tried updating my data like so but it doesn't work
<?php
require("config.inc.php");//this piece of code us for authentication and it works fine.
if(!empty($_POST))
{
/**
the values below in the POST are valid not empty values
**/
$shell = $_POST['shell'];
$reporter = $_POST['reporter'];
//query
$query = "UPDATE `shellingdb`
SET `likes` = `likes` + 1
WHERE `shell` = :shell AND `reporter` = :reporter";
try {
$query_params = array(':shell' => $_POST['shell'], ':reporter' => $_POST['reporter']);//Updates likes
$stmt = $db->prepare($query);
$result = $stmt->execute($query_params);
$affected = $stmt->rowCount();//counts the number of affected rows during the update query
if($affected > 0)
{
$response["success"] = 1;
$response["message"] = "Updated! this number of rows were affected".$affected;
echo json_encode($response);
}else
{
$response["success"] = 2;
$response["message"] = "Not Updated! huh!".$affected;
echo json_encode($response);
}
}
catch (Exception $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!".$ex->getMessage();
die(json_encode($response));
}
}
?>
the config.inc.php
<?php
// These variables define the connection information for your MySQL database
$username = "xmnj3jh0jhtheu_14265914";
$password = "jhikjskjiavethew";
$host = "sqlkjnlkkjlk101.x3kuhiu0lkj.us";
$dbname = "x3lnklj0u_1426jbkb5914_gbabbjkhjajhlert";
// UTF-8 is a character encoding scheme that allows you to conveniently store
// a wide varienty of special characters, like � or �, in your database.
// By passing the following $options array to the database connection code we
// are telling the MySQL server that we want to communicate with it using UTF-8
// See Wikipedia for more information on UTF-8:
// http://en.wikipedia.org/wiki/UTF-8
$options = array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8');
// A try/catch statement is a common method of error handling in object oriented code.
// First, PHP executes the code within the try block. If at any time it encounters an
// error while executing that code, it stops immediately and jumps down to the
// catch block. For more detailed information on exceptions and try/catch blocks:
// http://us2.php.net/manual/en/language.exceptions.php
try
{
// This statement opens a connection to your database using the PDO library
// PDO is designed to provide a flexible interface between PHP and many
// different types of database servers. For more information on PDO:
// http://us2.php.net/manual/en/class.pdo.php
$db = new PDO("mysql:host={$host};dbname={$dbname};charset=utf8", $username, $password, $options);
}
catch(PDOException $ex)
{
// If an error occurs while opening a connection to your database, it will
// be trapped here. The script will output an error and stop executing.
// Note: On a production website, you should not output $ex->getMessage().
// It may provide an attacker with helpful information about your code
// (like your database username and password).
die("Failed to connect to the database: " . $ex->getMessage());
}
// This statement configures PDO to throw an exception when it encounters
// an error. This allows us to use try/catch blocks to trap database errors.
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// This statement configures PDO to return database rows from your database using an associative
// array. This means the array will have string indexes, where the string value
// represents the name of the column in your database.
$db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
// This block of code is used to undo magic quotes. Magic quotes are a terrible
// feature that was removed from PHP as of PHP 5.4. However, older installations
// of PHP may still have magic quotes enabled and this code is necessary to
// prevent them from causing problems. For more information on magic quotes:
// http://php.net/manual/en/security.magicquotes.php
if(function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc())
{
function undo_magic_quotes_gpc(&$array)
{
foreach($array as &$value)
{
if(is_array($value))
{
undo_magic_quotes_gpc($value);
}
else
{
$value = stripslashes($value);
}
}
}
undo_magic_quotes_gpc($_POST);
undo_magic_quotes_gpc($_GET);
undo_magic_quotes_gpc($_COOKIE);
}
// This tells the web browser that your content is encoded using UTF-8
// and that it should submit content back to you using UTF-8
header('Content-Type: text/html; charset=utf-8');
// This initializes a session. Sessions are used to store information about
// a visitor from one web page visit to the next. Unlike a cookie, the information is
// stored on the server-side and cannot be modified by the visitor. However,
// note that in most cases sessions do still use cookies and require the visitor
// to have cookies enabled. For more information about sessions:
// http://us.php.net/manual/en/book.session.php
session_start();
// Note that it is a good practice to NOT end your PHP files with a closing PHP tag.
// This prevents trailing newlines on the file from being included in your output,
// which can cause problems with redirecting users.
?>
don't know what's wrong and it gives no error it goes into the else statement, meaning the values were not updated. i tried the same code in sqlfiddle and it works but not in my PhpMyAdmin.
I know the updated value is supposed to be passed into the $query_params but am incrementing the value of likes each time it is run, and am not sure how to do that in the $query_params unless i use a seperate query to get the numberof likes and then increament it but that could be costly.
Query without PDO still it does not work this time it give update unsuccessful
<?php
$username = "x3jbhiukhkj0u426jbhjnbvh591mbhb4";
$password = "savjiuejbiuhilkmthljiew";
$host = "sqlnjhbjhnkjjjhbj";
$dbname = "x3hjbh0ukjioiuhgbjhvhgvh";
$shell = "Rustig";
$reporter = "davies";
//query
$query = "UPDATE `shellingdb`
SET `favs` = 1
WHERE `shell` = 'Rustig'";
$link = mysql_connect($host, $username, $password);
if (!$link)
{
die('Could not connect: ' . mysql_error());
}else
{
echo 'Connected successfully';
$db_selected = mysql_select_db($dbname, $link);
if (!$db_selected)
{
die ('Can\'t use foo : ' . mysql_error());
}else
{
echo 'Connected to database successfully';
if(empty($_POST))
{
$retval = mysql_query( $query, $link )or die(mysql_error($link));;
if(! $retval )
{
die('Could not query database: ' . mysql_error());
}else
{
if(mysql_affected_rows() > 0)
{
echo "Updated data successfully\n";
}else
{
//echo "shell=".$shell." reporter=".$reporter';
echo "Updated data Unsuccessfully\n";
}
}
}
}
}
mysql_close($link);
?>
The below is the output of the PDOStatement::debugDumpParams(); for the first php syntax
SQL: [124] UPDATE shellingdb SET likes = likes + 1 WHERE shell = :shell AND reporter >= :reporter Params: 2 Key: Name: [6] :shell paramno=-1 name=[6] ":shell" is_param=1 param_type=2 Key: Name: [9] :reporter paramno=-1 name=[9] ":reporter" is_param=1 param_type=2
I used bindParam. bindParam is a method on PDOStatement.
Try:
<?php
require("config.inc.php");//this piece of code us for authentication and it works fine.
if(isset($_POST))
{
/**
the values below in the POST are valid not empty values
**/
$shell = $_POST['shell'];
$reporter = $_POST['reporter'];
//query
$query = "UPDATE `shellingdb`
SET `likes` = `likes` + 1
WHERE `shell` = :shell AND `reporter` = :reporter";
try {
$stmt = $db->prepare($query);
$stmt->bindParam(":shell", $shell);
$stmt->bindParam(":reporter", $reporter);
$stmt->execute();
$affected = $stmt->rowCount();//counts the number of affected rows during the update query
if($affected > 0)
{
$response["success"] = 1;
$response["message"] = "Updated! this number of rows were affected".$affected;
echo json_encode($response);
}else
{
$response["success"] = 2;
$response["message"] = "Not Updated! huh!".$affected;
echo json_encode($response);
}
}
catch (Exception $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!".$ex->getMessage();
die(json_encode($response));
}
}
?>
some how, after long hours of try and error(Brut Forcing) this finally worked
$query = "UPDATE `shellingdb` SET `likes`=`likes`+1 WHERE `shell` = :shell AND `reporter` = :reporter";
Thanks all those who tried to help. :)
this ought to be simple, but it doesn't seem to be working for me. i have tested it with good and bad passwords. no matter what, it will not go into the else statement. i am not sure what i am missing
my code:
$mysqli = mysqli_connect("localhost", "joeuser", "somepass", "testDB");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
} else {
$sql = "SELECT * FROM login_info";
$res = mysqli_query($mysqli, $sql);
if ($res) {
while ($newArray = mysqli_fetch_array($res, MYSQLI_ASSOC)) {
$id = $newArray['first_name'];
$testField = $newArray['last_name'];
echo "The ID is ".$id." and the text is ".$testField."<br/>";
}
} else {
printf("Could not retrieve records: %s\n", mysqli_error($mysqli));
}
mysqli_free_result($res);
mysqli_close($mysqli);
}
If i send it a user and password that do exist it does the if statement fine, but if i send it a test for one that is not in the db it still won't do the else? why?
For successful SELECT, SHOW, DESCRIBE or EXPLAIN queries mysqli_query() will return a MySQLi_Result object.
A query is only not successful if some serious error occurred. Simply because a SELECT query didn't match any rows doesn't make the query unsuccessful. You'll still get a MySQLi_Result object back. You'll want to check with mysqli_num_rows whether the result set contains any rows.
BTW, save yourself some nesting:
if (!$something) {
exit;
}
// continue as usual
No need for an else here, since you're exiting anyway. Makes things simpler.
Like this:
if ($res) {
while ($newArray = mysqli_fetch_array($res, MYSQLI_ASSOC)) {
$id = $newArray['first_name'];
$testField = $newArray['last_name'];
echo "The ID is ".$id." and the text is ".$testField."<br/>";
}
}
if (!isset($id)) {
printf("Could not retrieve records: %s\n", mysqli_error($mysqli));
}
Firstly, Thaks for taking a look at my question.
I have a function that works perfectly for me, and I want to call another function from within that function however I'm getting all kinds of issues.
Here are the functions then I'll explain what I'm needing and what I'm running into.
They are probably very messy, but I'm learning and thought I'd try get fancy then clean it up.
function GetStation($id){
$x_db_host1="localhost"; // Host name
$x_db_username1="xxxx"; // Mysql username
$x_db_password1="xxxx"; // Mysql password
$x_db_name1="xxxx"; // Database name
// Connect to server and select databse.
mysql_connect("$x_db_host1", "$x_db_username1", "$x_db_password1");
mysql_select_db("$x_db_name1");
// SQL Query Setup for Station Name
$sql="SELECT * FROM stations WHERE ID = $id LIMIT 1";
$result=mysql_query($sql);
while($rows=mysql_fetch_array($result)){
$retnm = $rows['CallSign'];
}
mysql_close();
echo $retnm;
} // Closes Function
// List Delegates Function!!!!!!!!!!!!!!!!!!!
function ListDelegates(){
$x_db_host1="xxx"; // Host name
$x_db_username1="xxx"; // Mysql username
$x_db_password1="xxxx"; // Mysql password
$x_db_name1="xxxx"; // Database name
// Connect to server and select databse.
mysql_connect("$x_db_host1", "$x_db_username1", "$x_db_password1");
mysql_select_db("$x_db_name1");
$q = "SELECT * FROM delegates";
$result = mysql_query($q);
/* Error occurred, return given name by default */
$num_rows = mysql_numrows($result);
if(!$result || ($num_rows < 0)){
echo "Error displaying info";
return;
}
if($num_rows == 0){
echo "There are no delegates to display";
return;
}
/* Display table contents */
echo "<table id=\"one-column-emphasis\" summary=\"Delegates\"><thead>";
echo "<thead><tr><th>ID</th><th>Name</th><th>Station</th><th>Spec Req</th><th>BBQ</th><th>DIN</th><th>SAT</th><th>SUN</th></tr>";
echo "</thead><tbody>";
for($i=0; $i<$num_rows; $i++){
$d_id = mysql_result($result,$i,"DID");
$d_name1 = mysql_result($result,$i,"DFName");
$d_name2 = mysql_result($result,$i,"DLName");
$d_name = $d_name1 . " " . $d_name2;
$d_spec1 = mysql_result($result,$i,"DSpecRe");
$StatNm = mysql_result($result,$i,"DStation");
$d_st_name = GetStation($StatNm);
if ($d_spec1=="0"){ $d_spec = "-"; }
else {$d_spec = "YES"; }
$d_bbq1 = mysql_result($result,$i,"Dbbq"); // BBQ
if ($d_bbq1=="0"){ $d_bbq = "-"; }
else {$d_bbq = "NO"; }
$d_din1 = mysql_result($result,$i,"Dconfdinner"); // Dinner
if ($d_din1=="0"){ $d_din = "-"; }
else {$d_din = "NO"; }
$d_sat1 = mysql_result($result,$i,"DConfSat"); // Saturday
if ($d_sat1=="0"){ $d_sat = "-"; }
else {$d_sat = "NO"; }
$d_sun1 = mysql_result($result,$i,"DConfSat"); // Sunday
if ($d_sun1=="0"){ $d_sun = "-"; }
else {$d_sun = "NO"; }
echo "<tr><td>$d_id</td><td><strong>$d_name</strong></td><td>$d_st_name</td><td>$d_spec</td><td>$d_bbq</td><td>$d_din</td><td>$d_sat</td><td>$d_sun</td></tr>";
}
echo "</tbody></table></br>";
}
So I output ListDelegates() in a page and it displays a nice table etc.
Within ListDelegates() i use the GetStation() function.
This is because the table ListDelegates() uses contains the station ID number not name so I want GetStation($id) to output the station name
The problem I'm having is it seems GetStation() is outputting all names in the first call of the function so the first row in the table and is not breaking it down into each row and just one at a time :S
Here's what I think (I'm probably wrong) ListDelegates() is not calling GetStation() for each row it's doing it once even though it's in the loop. ??
I have no idea if this should even work at all... I'm just learning researching then trying things.
Please help me so that I can output station name
At the end of GetStation, you need to change
echo $retnm;
to
return $retnm;
You are printing out the name from inside the function GetStation, when you are intending to store it in a variable. What ends up happening, is that the result of GetStation is effectively echo'ed on the screen outside of any table row. Content that is inside a table but not inside a table cell gets collected to the top of a table in a browser. If you want to see what I mean, just view source from your browser after loading the page.
You don't need to connect to the database in each and every function. Usually you do the database connection at the top of your code and use the handle (in PHP the handle is usually optional) throughout your code. I think your problem is because when you call the function each time it makes a new connection and loses the previous data in the query.
My dear first of all you should place your code of connection with local host and database globally. It should be defined only once. you are defining it in both function.
something like this, and as suggested, you should have connection to database established somewhere else
function ListDelegates(){
$x_db_host1="xxx"; // Host name
$x_db_username1="xxx"; // Mysql username
$x_db_password1="xxxx"; // Mysql password
$x_db_name1="xxxx"; // Database name
// Connect to server and select databse.
mysql_connect("$x_db_host1", "$x_db_username1", "$x_db_password1");
mysql_select_db("$x_db_name1");
$q = "SELECT * FROM delegates";
$result = mysql_query($q);
/* Error occurred, return given name by default */
$num_rows = mysql_numrows($result);
if(!$result || ($num_rows < 0)){
echo "Error displaying info";
return;
}
if($num_rows == 0){
echo "There are no delegates to display";
return;
}
/* Display table contents */
echo "<table id=\"one-column-emphasis\" summary=\"Delegates\"><thead>";
echo "<thead><tr><th>ID</th><th>Name</th><th>Station</th><th>Spec Req</th><th>BBQ</th><th>DIN</th><th>SAT</th><th>SUN</th></tr>";
echo "</thead><tbody>";
for($i=0; $i<$num_rows; $i++){
$d_id = mysql_result($result,$i,"DID");
$d_name1 = mysql_result($result,$i,"DFName");
$d_name2 = mysql_result($result,$i,"DLName");
$d_name = $d_name1 . " " . $d_name2;
$d_spec1 = mysql_result($result,$i,"DSpecRe");
$StatNm = mysql_result($result,$i,"DStation");
$d_bbq1 = mysql_result($result,$i,"Dbbq"); // BBQ
$d_din1 = mysql_result($result,$i,"Dconfdinner"); // Dinner
$d_sat1 = mysql_result($result,$i,"DConfSat"); // Saturday
$d_sun1 = mysql_result($result,$i,"DConfSat"); // Sunday
//$d_st_name = GetStation($StatNm);
$sql="SELECT * FROM stations WHERE ID = $StatNm LIMIT 1";
while($rows=mysql_fetch_array($result)){
$d_st_name = $rows['CallSign'];
}
if ($d_spec1=="0"){ $d_spec = "-"; }
else {$d_spec = "YES"; }
if ($d_bbq1=="0"){ $d_bbq = "-"; }
else {$d_bbq = "NO"; }
if ($d_din1=="0"){ $d_din = "-"; }
else {$d_din = "NO"; }
if ($d_sat1=="0"){ $d_sat = "-"; }
else {$d_sat = "NO"; }
if ($d_sun1=="0"){ $d_sun = "-"; }
else {$d_sun = "NO"; }
echo "<tr><td>$d_id</td><td><strong>$d_name</strong></td><td>$d_st_name</td><td>$d_spec</td><td>$d_bbq</td><td>$d_din</td><td>$d_sat</td><td>$d_sun</td></tr>";
}
echo "</tbody></table></br>";
}