I have a while loop inside a foreach loop. The while loop never exits and crashes the server, I can't figure out why. Here's a condensed version of the code.
foreach( $final_plates as $key => $value) {
$Plate_No = ($value['plate_no']);
$sql = "SELECT J.PLATE_NO FROM PLATE_LOGS J WHERE (J.PLATE_NO = " . $Plate_No . ")";
$db->query($sql);
while ($row = oci_fetch_assoc($db2->result)) {
echo $row['PLATE_NO'] . "</br>";
}
}
If I use the following statement instead of the while loop, the first record will be found without any problem
$row = oci_fetch_assoc($db->result);
I am using a class to connect to the database that I didn't write. I'm also new to programming. Here's some code from the class.
function connect(){
$this->connection = oci_connect($this->user, $this->password, $this->db) or die("Connection Failed: " . oci_error());
if(!$this->connection)
{
return false;
}
}
function query($sql){
// Query SQL
$this->result = oci_parse($this->connection, $sql) or die ("SQL ERROR" . oci_error($this->connection));
oci_execute($this->result) or die ("SQL ERROR" . oci_error($this->result));
}
Related
I want to print result of a Mysqli query, But when I try to do as following way, It does not return any values or error. The code does not go through the while loop. What would be the wrong with my code, Please help me!
<?php
$mysqli = new mysqli("localhost", "root", "", "domains");
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}
$part = explode(".", $str);
$part1 = $part[0];
$part2 = $part[1];
$sql = "SELECT
DomainCategory.Name
FROM
DomainName_Client,
DomainNameType,
DomainCategory,
OrderDomain_Client
WHERE
DomainName_Client.Name = '$part1'
AND DomainNameType.Name = '$part2'
AND DomainName_Client.TypeID = DomainNameType.ID
AND DomainCategory.ID = DomainName_Client.DomainCategoryID
AND OrderDomain_Client.DomainNameID = DomainName_Client.ID";
$result = $mysqli->query($sql);
if (!$result = $mysqli->query($sql)) {
die('There was an error running the query ' . $mysqli->error . ']');
}
while ($row = $result->fetch_assoc()) {
echo 'Total results: ' . $result->num_rows;
}
?>
First you check the number of results returning in the sql query using the following code and after that you print it using while or for loop.
echo $result->num_rows;
I learning oop and want to use pdo to execute mysql query. I have a query inside function that I want to execute. When I do this I get an error:
Fatal error: Call to a member function exec() on a non-object
What I'am doing wrong?
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
function testDuplicate($model) {
$SQL = "SELECT product_id FROM " . DB_PREFIX . "product WHERE model LIKE '" .$model . "'";
$result = $conn->exec($SQL);
if ($result->rows) return false;
return true;
}
function testDuplicateCat($cat) {
$SQL = "SELECT category_id FROM " . DB_PREFIX . "category WHERE category_id = '" .$cat . "'";
$result = $conn->exec($SQL);
if ($result->rows) return false;
return true;
}
foreach ($xml->PRODUCT as $child) {
if(testDuplicate($child->ID)){
...
}
}
This issue is raised because the $conn variable inside the testDuplicate function is not defined inside the scope of the function.
You could do this:
function testDuplicate($model) {
global $conn;
...
}
However it is not advice able to do so, its better to use static variables.
function getconn(){
static $conn;
if(!isset($conn)){
$conn = new PDO(...);
}
return $conn;
}
function foobar(){
$result = getconn()->query($sql);
while($row = $result->fetch()){
$ids[] = $row['category_id'];
}
return sizeof($ids) > 0 ? $ids : false;
}
if(($list = foobar()) == false){
echo "products " . var_export($list) . ' are duplicate values';
}
Why? Because you cannot simply overwrite the connection variable, even by accident or by using someone elses code. There are better alternatives but this is just a quick and safe example.
I am new to mysqli and was going through a tutorial from: http://www.binpress.com/tutorial/using-php-with-mysql-the-right-way/17#comment1
I was able to connect to my database using this:
$config = parse_ini_file('../config.ini');
$connection = mysqli_connect('localhost',$config['username'],$config['password'],$config['dbname']);
if($connection === false) {
die('Connection failed [' . $db->connect_error . ']');
}
echo("hello"); //this worked!
But then I tried wrapping it in a function (as discussed in the tutorial)... I saw that you call the connection function from another function... in the tutorial each function keeps getting called from another and another... and I never quite found where the initial call started from to get the domino effect of functions calling eachother.. so anyway, I tried to stop it at two just to test and teach myself.. but it's not working and I don't know why:
function db_connect() {
static $connection;
if(!isset($connection)) {
$config = parse_ini_file('../config.ini');
$connection = mysqli_connect('localhost',$config['username'],$config['password'],$config['dbname']);
}
if($connection === false) {
return mysqli_connect_error();
}
return $connection;
echo("hello2");
}
function db_query($query) {
$connection = db_connect();
$result = mysqli_query($connection,$query);
return $result;
echo("hello1");
}
db_query("SELECT `Q1_Q`,`Q1_AnsA` FROM `Game1_RollarCoaster`"); //this didn't work :(
Well I ended up taking it out of the functions and made the code super simple (sticking with procedural instead of OOP even though a lot of tutorials use OOP - thought it was better to start this way):
<?php
$config = parse_ini_file('../config.ini');
$link = mysqli_connect('localhost',$config['username'],$config['password'],$config['dbname']);
if(mysqli_connect_errno()){
echo mysqli_connect_error();
}
$query = "SELECT * FROM Game1_RollarCoaster";
$result = mysqli_query($link, $query);
while ($row = mysqli_fetch_array($result)) {
echo $row[Q1_Q] . '<-- Here is your question! ' . $row[Q1_AnsA] . '<-- Here is your answer! ';
echo '<br />';
}
mysqli_free_result($result);
mysqli_close($link);
?>
Here's a simple mysqli solution for you:
$db = new mysqli('localhost','user','password','database');
$resource = $db->query('SELECT field FROM table WHERE 1');
$row = $resource->fetch_assoc();
echo "{$row['field']}";
$resource->free();
$db->close();
If you're grabbing more than one row, I do it like this:
$db = new mysqli('localhost','user','password','database');
$resource = $db->query('SELECT field FROM table WHERE 1');
while ( $row = $resource->fetch_assoc() ) {
echo "{$row['field']}";
}
$resource->free();
$db->close();
With Error Handling: If there is a fatal error the script will terminate with an error message.
// ini_set('display_errors',1); // Uncomment to show errors to the end user.
if ( $db->connect_errno ) die("Database Connection Failed: ".$db->connect_error);
$db = new mysqli('localhost','user','password','database');
$resource = $db->query('SELECT field FROM table WHERE 1');
if ( !$resource ) die('Database Error: '.$db->error);
while ( $row = $resource->fetch_assoc() ) {
echo "{$row['field']}";
}
$resource->free();
$db->close();
With try/catch exception handling: This lets you deal with any errors all in one place and possibly continue execution when something fails, if that's desired.
try {
if ( $db->connect_errno ) throw new Exception("Connection Failed: ".$db->connect_error);
$db = new mysqli('localhost','user','password','database');
$resource = $db->query('SELECT field FROM table WHERE 1');
if ( !$resource ) throw new Exception($db->error);
while ( $row = $resource->fetch_assoc() ) {
echo "{$row['field']}";
}
$resource->free();
$db->close();
} catch (Exception $e) {
echo "DB Exception: ",$e->getMessage(),"\n";
}
I have this seriously strange issue. I have 4 tables in a FileMaker 12 file: Issues, Articles, FMBM, Ads. I have 2 methods in my results class, one writes a series of serial IDs to each of these tables, the other queries those tables. The method that writes the serial ID's works perfectly. The method that queries the tables works for 3 of the 4 tables (Articles, FMBM, Ads) but returns no result set for Issues.
I have checked permissions, but as this is the admin user, it has full access to all and there are no table specific or layout specific restrictions (again, it's the admin). Oddly enough, I thought maybe it's the query, but when I run "SELECT * FROM Issues" in my ODBC Query Tool, it returns the appropriate results. It's just baffling to me that the setKeys() method works perfectly but the view method ONLY fails on Issues.
The Model:
class Application_Model_Results {
public $keys;
public $odbc;
public $comp = array('Issues', 'Articles', 'Ads', 'FMBM');
public $existing = array();
function setKeys() {
$this->odbc = 'Migrator';
$obj = new Application_Model_Utilities();
$obj->name = $this->odbc;
$config = $obj->getElements();
$conn = odbc_connect($this->odbc, $config['user'], $config['password']);
if (!$conn) {
exit("Connection failed: -> " . $this->odbc);
}
foreach ($this->comp as $c) {
$sql = "SELECT Serial_ID FROM " . $c;
$rs = odbc_exec($conn, $sql);
if (!$rs) {
exit("Error in SQL");
}
while (odbc_fetch_row($rs)) {
$this->existing[] = odbc_result($rs, 'Serial_ID');
}
if (in_array(true, $this->keys[$c])) {
foreach ($this->keys[$c] as $v) {
if (!in_array($v, $this->existing)) {
$iSql = "INSERT INTO " . $c . "(Serial_ID) VALUES('$v')";
odbc_exec($conn, $iSql);
$obj->output = 'Inserted Serial_ID: ' . $v . ' into table ' . $c;
$obj->logger();
}
}
}
}
}
public function getResults($table) {
$this->odbc = 'Migrator';
$obj = new Application_Model_Utilities();
$obj->name = $this->odbc;
$config = $obj->getElements();
$conn = odbc_connect($this->odbc, $config['user'], $config['password']);
if (!$conn) {
exit("Connection failed: -> " . $this->odbc);
}
$sql = "SELECT * FROM " . $table;
$rs = odbc_exec($conn, $sql);
while (odbc_fetch_row($rs)) {
$results[odbc_result($rs, 'Serial_ID')] = odbc_fetch_array($rs);
}
return $results;
}
}
The Controller:
public function viewAction()
{
$results = new Application_Model_Results();
$result = $results->getResults('Issues');
$page = $this->_getParam('page', 1);
$paginator = Zend_Paginator::factory($result);
$paginator->setItemCountPerPage(1);
$paginator->setCurrentPageNumber($page);
$this->view->paginator = $paginator;
}
Note: If scrap the view code, and just write:
<?php
$conn = odbc_connect('Migrator', 'admin', '********');
$sql = "SELECT * FROM Issues";
$rs = odbc_exec($conn, $sql);
while(odbc_fetch_row($rs)){
print_r(odbc_result_all($rs));
}
I get no rows returned.
EDIT:
Culprit has been found:
while (odbc_fetch_row($rs)) {
$results[odbc_result($rs, 'Serial_ID')] = odbc_fetch_array($rs);
}
Now, I am working on a solution that grabs each result row and pushes it to an associative array, the problem is, on the view, I need to dump everything, not have to use odbc_result($rs, ) for every single field.
Finally, my nightmare is over:
public function getResults($table) {
$obj = new Application_Model_Utilities();
$obj->name = $this->odbc;
$config = $obj->getElements();
$conn = odbc_connect($this->odbc, $config['user'], $config['password']);
if (!$conn) {
exit("Connection failed: -> " . $this->odbc);
}
$sql = "SELECT * FROM " . $table;
$obj->output = 'Running query: ' . $sql;
$obj->logger();
$rs = odbc_exec($conn, $sql);
$obj->output = 'Results found: ' . odbc_num_rows($rs);
$obj->logger();
$results = array();
$i = 1;
while(odbc_fetch_row($rs)){
$results[] = odbc_fetch_array($rs, $i);
$i++;
}
return $results;
}
This returns an associative array that I can actually loop through.
NOTE: in this instance, any use of odbc_fetch_array, odbc_fetch_object, odbc_fetch_into, unless I forced the odbc_fetch_array to have a row value, would only reutrn every other result, not all results and then would die on the view unless I specifically called for a field value, and even then, the same value persisted across all paginated records.
I was wondering if there's a way in PHP to list all available databases by usage of mysqli. The following works smooth in MySQL (see php docs):
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
$db_list = mysql_list_dbs($link);
while ($row = mysql_fetch_object($db_list)) {
echo $row->Database . "\n";
}
Can I Change:
$db_list = mysql_list_dbs($link); // mysql
Into something like:
$db_list = mysqli_list_dbs($link); // mysqli
If this is not working, would it be possible to convert a created mysqli connection into a regular mysql and continue fetching/querying on the new converted connection?
It doesn't appear as though there's a function available to do this, but you can execute a show databases; query and the rows returned will be the databases available.
EXAMPLE:
Replace this:
$db_list = mysql_list_dbs($link); //mysql
With this:
$db_list = mysqli_query($link, "SHOW DATABASES"); //mysqli
I realize this is an old thread but, searching the 'net still doesn't seem to help. Here's my solution;
$sql="SHOW DATABASES";
$link = mysqli_connect($dbhost,$dbuser,$dbpass) or die ('Error connecting to mysql: ' . mysqli_error($link).'\r\n');
if (!($result=mysqli_query($link,$sql))) {
printf("Error: %s\n", mysqli_error($link));
}
while( $row = mysqli_fetch_row( $result ) ){
if (($row[0]!="information_schema") && ($row[0]!="mysql")) {
echo $row[0]."\r\n";
}
}
Similar to Rick's answer, but this is the way to do it if you prefer to use mysqli in object-orientated fashion:
$mysqli = ... // This object is my equivalent of Rick's $link object.
$sql = "SHOW DATABASES";
$result = $mysqli->query($sql);
if ($result === false) {
throw new Exception("Could not execute query: " . $mysqli->error);
}
$db_names = array();
while($row = $result->fetch_array(MYSQLI_NUM)) { // for each row of the resultset
$db_names[] = $row[0]; // Add db name to $db_names array
}
echo "Database names: " . PHP_EOL . print_r($db_names, TRUE); // display array
Here is a complete and extended solution for the answer, there are some databases that you do not need to read because those databases are system databases and we do not want them to appear on our result set, these system databases differ by the setup you have in your SQL so this solution will help in any kind of situations.
first you have to make database connection in OOP
//error reporting Procedural way
//mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
//error reporting OOP way
$driver = new mysqli_driver();
$driver->report_mode = MYSQLI_REPORT_ALL & MYSQLI_REPORT_STRICT;
$conn = new mysqli("localhost","root","kasun12345");
using Index array of search result
$dbtoSkip = array("information_schema","mysql","performance_schema","sys");
$result = $conn->query("show databases");
while($row = $result->fetch_array(MYSQLI_NUM)){
$print = true;
foreach($dbtoSkip as $key=>$vlue){
if($row[0] == $vlue) {
$print=false;
unset($dbtoSkip[$key]);
}
}
if($print){
echo '<br/>'.$row[0];
}
}
same with Assoc array of search result
$dbtoSkip = array("information_schema","mysql","performance_schema","sys");
$result = $conn->query("show databases");
while($row = $result->fetch_array(MYSQLI_ASSOC)){
$print = true;
foreach($dbtoSkip as $key=>$vlue){
if($row["Database"] == $vlue) {
$print=false;
unset($dbtoSkip[$key]);
}
}
if($print){
echo '<br/>'.$row["Database"];
}
}
same using object of search result
$dbtoSkip = array("information_schema","mysql","performance_schema","sys");
$result = $conn->query("show databases");
while($obj = $result->fetch_object()){
$print = true;
foreach($dbtoSkip as $key=>$vlue){
if( $obj->Database == $vlue) {
$print=false;
unset($dbtoSkip[$key]);
}
}
if($print){
echo '<br/>'. $obj->Database;
}
}