Related
How do I use the json_encode() function with MySQL query results? Do I need to iterate through the rows or can I just apply it to the entire results object?
$sth = mysqli_query($conn, "SELECT ...");
$rows = array();
while($r = mysqli_fetch_assoc($sth)) {
$rows[] = $r;
}
print json_encode($rows);
The function json_encode needs PHP >= 5.2 and the php-json package - as mentioned here
NOTE: mysql is deprecated as of PHP 5.5.0, use mysqli extension instead http://php.net/manual/en/migration55.deprecated.php.
Try this, this will create your object properly
$result = mysql_query("SELECT ...");
$rows = array();
while($r = mysql_fetch_assoc($result)) {
$rows['object_name'][] = $r;
}
print json_encode($rows);
http://www.php.net/mysql_query says "mysql_query() returns a resource".
http://www.php.net/json_encode says it can encode any value "except a resource".
You need to iterate through and collect the database results in an array, then json_encode the array.
When using PDO
Use fetchAll() to fetch all rows as an associative array.
$stmt = $pdo->query('SELECT * FROM article');
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($rows);
When your SQL has parameters:
$stmt = $pdo->prepare('SELECT * FROM article WHERE id=?');
$stmt->execute([1]);
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($rows);
When you need to rekey the table you can use foreach loop and build the array manually.
$stmt = $pdo->prepare('SELECT * FROM article WHERE id=?');
$stmt->execute([1]);
$rows = [];
foreach ($stmt as $row) {
$rows[] = [
'newID' => $row['id'],
'Description' => $row['text'],
];
}
echo json_encode($rows);
When using mysqli
Use fetch_all() to fetch all rows as an associative array.
$res = $mysqli->query('SELECT * FROM article');
$rows = $res->fetch_all(MYSQLI_ASSOC);
echo json_encode($rows);
When your SQL has parameters you need to perform prepare/bind/execute/get_result.
$id = 1;
$stmt = $mysqli->prepare('SELECT * FROM article WHERE id=?');
$stmt->bind_param('s', $id); // binding by reference. Only use variables, not literals
$stmt->execute();
$res = $stmt->get_result(); // returns mysqli_result same as mysqli::query()
$rows = $res->fetch_all(MYSQLI_ASSOC);
echo json_encode($rows);
When you need to rekey the table you can use foreach loop and build the array manually.
$stmt = $mysqli->prepare('SELECT * FROM article WHERE id=?');
$stmt->bind_param('s', $id);
$stmt->execute();
$res = $stmt->get_result();
$rows = [];
foreach ($res as $row) {
$rows[] = [
'newID' => $row['id'],
'Description' => $row['text'],
];
}
echo json_encode($rows);
When using mysql_* API
Please, upgrade as soon as possible to a supported PHP version! Please take it seriously. If you need a solution using the old API, this is how it could be done:
$res = mysql_query("SELECT * FROM article");
$rows = [];
while ($row = mysql_fetch_assoc($res)) {
$rows[] = $row;
}
echo json_encode($rows);
if ($result->num_rows > 0) {
# code...
$arr = [];
$inc = 0;
while ($row = $result->fetch_assoc()) {
# code...
$jsonArrayObject = (array('lat' => $row["lat"], 'lon' => $row["lon"], 'addr' => $row["address"]));
$arr[$inc] = $jsonArrayObject;
$inc++;
}
$json_array = json_encode($arr);
echo $json_array;
} else {
echo "0 results";
}
The code below works fine here!
<?php
$con=mysqli_connect("localhost",$username,$password,databaseName);
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$query = "the query here";
$result = mysqli_query($con,$query);
$rows = array();
while($r = mysqli_fetch_array($result)) {
$rows[] = $r;
}
echo json_encode($rows);
mysqli_close($con);
?>
The above will not work, in my experience, before you name the root-element
in the array to something, I have not been able to access anything in the
final json before that.
$sth = mysql_query("SELECT ...");
$rows = array();
while($r = mysql_fetch_assoc($sth)) {
$rows['root_name'] = $r;
}
print json_encode($rows);
That should do the trick!
<?php
define('HOST', 'localhost');
define('USER', 'root');
define('PASS', '');
define('DB', 'dishant');
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$con = mysqli_connect(HOST, USER, PASS, DB);
$sql = "select * from demo ";
$sth = mysqli_query($con, $sql);
$rows = array();
while ($r = mysqli_fetch_array($sth, MYSQLI_ASSOC)) {
$row_array['id'] = $r;
array_push($rows, $row_array);
}
echo json_encode($rows);
array_push($rows,$row_array); helps to build an array otherwise it gives the last value in the while loop.
This works like append method of StringBuilder in Java.
My simple fix to stop it putting speech marks around numeric values...
while($r = mysql_fetch_assoc($rs)){
while($elm=each($r))
{
if(is_numeric($r[$elm["key"]])){
$r[$elm["key"]]=intval($r[$elm["key"]]);
}
}
$rows[] = $r;
}
Sorry, this is extremely long after the question, but:
$sql = 'SELECT CONCAT("[", GROUP_CONCAT(CONCAT("{username:'",username,"'"), CONCAT(",email:'",email),"'}")), "]")
AS json
FROM users;'
$msl = mysql_query($sql)
print($msl["json"]);
Just basically:
"SELECT" Select the rows
"CONCAT" Returns the string that results from concatenating (joining) all the arguments
"GROUP_CONCAT" Returns a string with concatenated non-NULL value from a group
One more option using FOR loop:
$sth = mysql_query("SELECT ...");
for($rows = array(); $row = mysql_fetch_assoc($sth); $rows[] = $row);
print json_encode($rows);
The only disadvantage is that loop for is slower then e.g. while or especially foreach
For example
$result = mysql_query("SELECT * FROM userprofiles where NAME='TESTUSER' ");
1.) if $result is only one row.
$response = mysql_fetch_array($result);
echo json_encode($response);
2.) if $result is more than one row. You need to iterate the rows and save it to an array and return a json with array in it.
$rows = array();
if (mysql_num_rows($result) > 0) {
while($r = mysql_fetch_assoc($result)) {
$id = $r["USERID"]; //a column name (ex.ID) used to get a value of the single row at at time
$rows[$id] = $r; //save the fetched row and add it to the array.
}
}
echo json_encode($rows);
I solved like this
$stmt->bind_result($cde,$v_off,$em_nm,$q_id,$v_m);
$list=array();
$i=0;
while ($cresult=$stmt->fetch()){
$list[$i][0]=$cde;
$list[$i][1]=$v_off;
$list[$i][2]=$em_nm;
$list[$i][3]=$q_id;
$list[$i][4]=$v_m;
$i=$i+1;
}
echo json_encode($list);
This will be returned to ajax as result set
and by using json parse in javascript part like this :
obj = JSON.parse(dataX);
we could simplify Paolo Bergantino answer like this
$sth = mysql_query("SELECT ...");
print json_encode(mysql_fetch_assoc($sth));
We shouldn't see any use of mysql_ functions in modern applications, so either use mysqli_ or pdo functions.
Explicitly calling header("Content-type:application/json"); before outputting your data payload is considered to be best practice by some devs. This is usually not a requirement, but clarifies the format of the payload to whatever might be receiving it.
Assuming this is the only data being printed, it is safe to print the json string using exit() which will terminate the execution of the script as well. This, again, is not essential because echo will work just as well, but some devs consider it a good practice to explicitly terminate the script.
MySQLi single-row result set from query result set object:
exit(json_encode($result->fetch_assoc())); // 1-dimensional / flat
MySQLi multi-row result set from query result set object:
Prior to PHP 8.1.0, available only with mysqlnd.
exit(json_encode($result->fetch_all(MYSQLI_ASSOC))); // 2-dimensional / array of rows
MySQLi single-row result set from prepared statement:
$result = $stmt->get_result();
exit(json_encode($result->fetch_assoc())); // 1-dimensional / flat
MySQLi multi-row result set from prepared statement:
$result = $stmt->get_result();
exit(json_encode($result->fetch_all(MYSQLI_ASSOC))); // 2-dimensional / array of rows
PDO single-row result set from query result set object:
exit(json_encode($result->fetch(PDO::FETCH_ASSOC))); // 1-dimensional / flat
PDO multi-row result set from query result set object:
exit(json_encode($result->fetchAll(PDO::FETCH_ASSOC))); // 2-dimensional / array of rows
PDO single-row result set from prepared statement:
exit(json_encode($stmt->fetch(PDO::FETCH_ASSOC))); // 1-dimensional / flat
PDO multi-row result set from prepared statement:
exit(json_encode($stmt->fetchAll(PDO::FETCH_ASSOC))); // 2-dimensional / array of rows
Obey these rules to prevent the possibility of generating invalid json.:
you should only call json_encode() after you are completely finished manipulating your result array and
you should always use json_encode() to encode the payload (avoid the urge to manually craft a json string using other string functions or concatenation).
If you need to iterate your result set data to run php functions or provide functionality that your database language doesn't offer, then you can immediately iterate the result set object with foreach() and access values using array syntax -- e.g.
$response = [];
foreach ($result as $row) {
$row['col1'] = someFunction($row['id']);
$response[] = $row;
}
exit(json_encode($response));
If you are calling json_encode() on your data payload, then it won't make any difference to whether the payload is an array of arrays or an array of objects. The json string that is created will have identical syntax.
You do not need to explicitly close the database connection after you are finished with the connection. When your script terminates, the connection will be closed for you automatically.
Considering there's not really any NESTED json objects in mysql in general etc., it's fairly easy to make your own encoding function
First, the function to retrieve the mysqli results in an array:
function noom($rz) {
$ar = array();
if(mysqli_num_rows($rz) > 0) {
while($k = mysqli_fetch_assoc($rz)) {
foreach($k as $ki=>$v) {
$ar[$ki] = $v;
}
}
}
return $ar;
}
Now, function to encode array as json:
function json($ar) {
$str = "";
$str .= "{";
$id = 0;
foreach($ar as $a=>$b) {
$id++;
$str .= "\"".$a."\":";
if(!is_numeric($b)) {
$str .= "\"".$b."\"";
} else {
$str .= $b;
}
if($id < count($ar)) {
$str .= ",";
}
}
$str .= "}";
return $str;
}
Then to use it:
<?php
$o = new mysqli(
"localhost",
"root",""
);
if($o->connect_error) {
echo "DUDE what are you/!";
} else {
$rz = mysqli_query($o,
"SELECT * FROM mydatabase.mytable"
);
$ar = noom($rz);
echo json($ar);
}
?>
How do I use the json_encode() function with MySQL query results? Do I need to iterate through the rows or can I just apply it to the entire results object?
$sth = mysqli_query($conn, "SELECT ...");
$rows = array();
while($r = mysqli_fetch_assoc($sth)) {
$rows[] = $r;
}
print json_encode($rows);
The function json_encode needs PHP >= 5.2 and the php-json package - as mentioned here
NOTE: mysql is deprecated as of PHP 5.5.0, use mysqli extension instead http://php.net/manual/en/migration55.deprecated.php.
Try this, this will create your object properly
$result = mysql_query("SELECT ...");
$rows = array();
while($r = mysql_fetch_assoc($result)) {
$rows['object_name'][] = $r;
}
print json_encode($rows);
http://www.php.net/mysql_query says "mysql_query() returns a resource".
http://www.php.net/json_encode says it can encode any value "except a resource".
You need to iterate through and collect the database results in an array, then json_encode the array.
When using PDO
Use fetchAll() to fetch all rows as an associative array.
$stmt = $pdo->query('SELECT * FROM article');
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($rows);
When your SQL has parameters:
$stmt = $pdo->prepare('SELECT * FROM article WHERE id=?');
$stmt->execute([1]);
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($rows);
When you need to rekey the table you can use foreach loop and build the array manually.
$stmt = $pdo->prepare('SELECT * FROM article WHERE id=?');
$stmt->execute([1]);
$rows = [];
foreach ($stmt as $row) {
$rows[] = [
'newID' => $row['id'],
'Description' => $row['text'],
];
}
echo json_encode($rows);
When using mysqli
Use fetch_all() to fetch all rows as an associative array.
$res = $mysqli->query('SELECT * FROM article');
$rows = $res->fetch_all(MYSQLI_ASSOC);
echo json_encode($rows);
When your SQL has parameters you need to perform prepare/bind/execute/get_result.
$id = 1;
$stmt = $mysqli->prepare('SELECT * FROM article WHERE id=?');
$stmt->bind_param('s', $id); // binding by reference. Only use variables, not literals
$stmt->execute();
$res = $stmt->get_result(); // returns mysqli_result same as mysqli::query()
$rows = $res->fetch_all(MYSQLI_ASSOC);
echo json_encode($rows);
When you need to rekey the table you can use foreach loop and build the array manually.
$stmt = $mysqli->prepare('SELECT * FROM article WHERE id=?');
$stmt->bind_param('s', $id);
$stmt->execute();
$res = $stmt->get_result();
$rows = [];
foreach ($res as $row) {
$rows[] = [
'newID' => $row['id'],
'Description' => $row['text'],
];
}
echo json_encode($rows);
When using mysql_* API
Please, upgrade as soon as possible to a supported PHP version! Please take it seriously. If you need a solution using the old API, this is how it could be done:
$res = mysql_query("SELECT * FROM article");
$rows = [];
while ($row = mysql_fetch_assoc($res)) {
$rows[] = $row;
}
echo json_encode($rows);
if ($result->num_rows > 0) {
# code...
$arr = [];
$inc = 0;
while ($row = $result->fetch_assoc()) {
# code...
$jsonArrayObject = (array('lat' => $row["lat"], 'lon' => $row["lon"], 'addr' => $row["address"]));
$arr[$inc] = $jsonArrayObject;
$inc++;
}
$json_array = json_encode($arr);
echo $json_array;
} else {
echo "0 results";
}
The code below works fine here!
<?php
$con=mysqli_connect("localhost",$username,$password,databaseName);
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$query = "the query here";
$result = mysqli_query($con,$query);
$rows = array();
while($r = mysqli_fetch_array($result)) {
$rows[] = $r;
}
echo json_encode($rows);
mysqli_close($con);
?>
The above will not work, in my experience, before you name the root-element
in the array to something, I have not been able to access anything in the
final json before that.
$sth = mysql_query("SELECT ...");
$rows = array();
while($r = mysql_fetch_assoc($sth)) {
$rows['root_name'] = $r;
}
print json_encode($rows);
That should do the trick!
<?php
define('HOST', 'localhost');
define('USER', 'root');
define('PASS', '');
define('DB', 'dishant');
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$con = mysqli_connect(HOST, USER, PASS, DB);
$sql = "select * from demo ";
$sth = mysqli_query($con, $sql);
$rows = array();
while ($r = mysqli_fetch_array($sth, MYSQLI_ASSOC)) {
$row_array['id'] = $r;
array_push($rows, $row_array);
}
echo json_encode($rows);
array_push($rows,$row_array); helps to build an array otherwise it gives the last value in the while loop.
This works like append method of StringBuilder in Java.
My simple fix to stop it putting speech marks around numeric values...
while($r = mysql_fetch_assoc($rs)){
while($elm=each($r))
{
if(is_numeric($r[$elm["key"]])){
$r[$elm["key"]]=intval($r[$elm["key"]]);
}
}
$rows[] = $r;
}
Sorry, this is extremely long after the question, but:
$sql = 'SELECT CONCAT("[", GROUP_CONCAT(CONCAT("{username:'",username,"'"), CONCAT(",email:'",email),"'}")), "]")
AS json
FROM users;'
$msl = mysql_query($sql)
print($msl["json"]);
Just basically:
"SELECT" Select the rows
"CONCAT" Returns the string that results from concatenating (joining) all the arguments
"GROUP_CONCAT" Returns a string with concatenated non-NULL value from a group
One more option using FOR loop:
$sth = mysql_query("SELECT ...");
for($rows = array(); $row = mysql_fetch_assoc($sth); $rows[] = $row);
print json_encode($rows);
The only disadvantage is that loop for is slower then e.g. while or especially foreach
For example
$result = mysql_query("SELECT * FROM userprofiles where NAME='TESTUSER' ");
1.) if $result is only one row.
$response = mysql_fetch_array($result);
echo json_encode($response);
2.) if $result is more than one row. You need to iterate the rows and save it to an array and return a json with array in it.
$rows = array();
if (mysql_num_rows($result) > 0) {
while($r = mysql_fetch_assoc($result)) {
$id = $r["USERID"]; //a column name (ex.ID) used to get a value of the single row at at time
$rows[$id] = $r; //save the fetched row and add it to the array.
}
}
echo json_encode($rows);
I solved like this
$stmt->bind_result($cde,$v_off,$em_nm,$q_id,$v_m);
$list=array();
$i=0;
while ($cresult=$stmt->fetch()){
$list[$i][0]=$cde;
$list[$i][1]=$v_off;
$list[$i][2]=$em_nm;
$list[$i][3]=$q_id;
$list[$i][4]=$v_m;
$i=$i+1;
}
echo json_encode($list);
This will be returned to ajax as result set
and by using json parse in javascript part like this :
obj = JSON.parse(dataX);
we could simplify Paolo Bergantino answer like this
$sth = mysql_query("SELECT ...");
print json_encode(mysql_fetch_assoc($sth));
We shouldn't see any use of mysql_ functions in modern applications, so either use mysqli_ or pdo functions.
Explicitly calling header("Content-type:application/json"); before outputting your data payload is considered to be best practice by some devs. This is usually not a requirement, but clarifies the format of the payload to whatever might be receiving it.
Assuming this is the only data being printed, it is safe to print the json string using exit() which will terminate the execution of the script as well. This, again, is not essential because echo will work just as well, but some devs consider it a good practice to explicitly terminate the script.
MySQLi single-row result set from query result set object:
exit(json_encode($result->fetch_assoc())); // 1-dimensional / flat
MySQLi multi-row result set from query result set object:
Prior to PHP 8.1.0, available only with mysqlnd.
exit(json_encode($result->fetch_all(MYSQLI_ASSOC))); // 2-dimensional / array of rows
MySQLi single-row result set from prepared statement:
$result = $stmt->get_result();
exit(json_encode($result->fetch_assoc())); // 1-dimensional / flat
MySQLi multi-row result set from prepared statement:
$result = $stmt->get_result();
exit(json_encode($result->fetch_all(MYSQLI_ASSOC))); // 2-dimensional / array of rows
PDO single-row result set from query result set object:
exit(json_encode($result->fetch(PDO::FETCH_ASSOC))); // 1-dimensional / flat
PDO multi-row result set from query result set object:
exit(json_encode($result->fetchAll(PDO::FETCH_ASSOC))); // 2-dimensional / array of rows
PDO single-row result set from prepared statement:
exit(json_encode($stmt->fetch(PDO::FETCH_ASSOC))); // 1-dimensional / flat
PDO multi-row result set from prepared statement:
exit(json_encode($stmt->fetchAll(PDO::FETCH_ASSOC))); // 2-dimensional / array of rows
Obey these rules to prevent the possibility of generating invalid json.:
you should only call json_encode() after you are completely finished manipulating your result array and
you should always use json_encode() to encode the payload (avoid the urge to manually craft a json string using other string functions or concatenation).
If you need to iterate your result set data to run php functions or provide functionality that your database language doesn't offer, then you can immediately iterate the result set object with foreach() and access values using array syntax -- e.g.
$response = [];
foreach ($result as $row) {
$row['col1'] = someFunction($row['id']);
$response[] = $row;
}
exit(json_encode($response));
If you are calling json_encode() on your data payload, then it won't make any difference to whether the payload is an array of arrays or an array of objects. The json string that is created will have identical syntax.
You do not need to explicitly close the database connection after you are finished with the connection. When your script terminates, the connection will be closed for you automatically.
Considering there's not really any NESTED json objects in mysql in general etc., it's fairly easy to make your own encoding function
First, the function to retrieve the mysqli results in an array:
function noom($rz) {
$ar = array();
if(mysqli_num_rows($rz) > 0) {
while($k = mysqli_fetch_assoc($rz)) {
foreach($k as $ki=>$v) {
$ar[$ki] = $v;
}
}
}
return $ar;
}
Now, function to encode array as json:
function json($ar) {
$str = "";
$str .= "{";
$id = 0;
foreach($ar as $a=>$b) {
$id++;
$str .= "\"".$a."\":";
if(!is_numeric($b)) {
$str .= "\"".$b."\"";
} else {
$str .= $b;
}
if($id < count($ar)) {
$str .= ",";
}
}
$str .= "}";
return $str;
}
Then to use it:
<?php
$o = new mysqli(
"localhost",
"root",""
);
if($o->connect_error) {
echo "DUDE what are you/!";
} else {
$rz = mysqli_query($o,
"SELECT * FROM mydatabase.mytable"
);
$ar = noom($rz);
echo json($ar);
}
?>
So do not have an idea why this function is not working? i am trying to select all the ids from the table but nothing is selected.
public function jobsArray()
{
$connection = Mage::getSingleton('core/resource')->getConnection('Envato_CustomConfig_Job');
$result = $connection->fetchAll("SELECT id FROM Envato_CustomConfig_Job");
$rows = array();
foreach($result as $record) {
$rows = ('value'=>$record, 'label'=>$record);
}
return $rows;
}
this function below works fine, I need the function above to do the same as teh function below.
public function toOptionArray()
{
return array(
array('value'=>1, 'label'=>'one'),
array('value'=>2, 'label'=>'Two'),
array('value'=>3, 'label'=>'Three'),
array('value'=>4, 'label'=>'Four')
);
}
There are a couple of issues with your code:
You're only selecting a single item (id, but later, I assume you're expecting an ID and a value).
$result = $connection->fetchAll("SELECT id FROM Envato_CustomConfig_Job");
record is an array from your SQL query, so you should be treating it as such. eg. $record['id']
$rows you want as an array, but you're overwriting it each time, so $rows[] = makes more sense
Something like:
public function jobsArray()
{
$connection = Mage::getSingleton('core/resource')->getConnection('Envato_CustomConfig_Job');
$result = $connection->fetchAll("SELECT id, label FROM Envato_CustomConfig_Job");
$rows = array();
foreach($result as $record) {
$rows[] = array('value'=>$record['id'], 'label'=>$record['label']);
}
return $rows;
}
Try using the core read/write resource. Change
$connection = Mage::getSingleton('core/resource')->getConnection('Envato_CustomConfig_Job');
To
$connection = Mage::getSingleton('core/resource')->getConnection('core_read');
I'm a newbie to PHP and I'm just trying the very basics of MVC. Everything is going good but I have a problem while fetching data from MySQL and populating a HTML table with it.
The problem is that my code is just returning one row of the table (there are three rows in that table).
I have tried many things and right now I'm using arrays for storing the data and passing to controller and then to the view.
Query class file having a function for getting data and name queryDB:
public function getdata(){
$connectObj=new dbConnection();
//its a connection class where mysql connection has been made
if(!$connectObj->connectDB()){
echo "Error in mysql: ".mysql_error();
return false;
}
else{
$query = "select * from tbl_cartypes";
$result = mysql_query($query) or die("Error: ".mysql_error());
$data = array();
while($row = mysql_fetch_assoc($result)){
$data[0] = $row['car_id'];
$data[1] = $row['car_name'];
$data[2] = $row['car_model'];
$data[3] = $row['car_type'];
$data[4] = $row['car_price'];
}
return $data;
}
$connectObj->closeDB();
}
The controller class where the controller of this query is name carController.php:
public function getAllData(){
$runQuery = new queryDB();
$array = array();
$array = $runQuery->getTickets($userid);
return $array;
}
And the final view where I'm just echoing my data:
include "$path/controllers/carController.php";
$ticket = new carController();
$array = array();
$array = $ticket->getdata();
for($i=0;$i<count($array);$i++){
echo $array[$i]."<br />";
}
Output of this code is without error, but the problem is that it's just fetching one row of the table whereas there are three rows.
So any one can help me with this?
It's fetching all rows, but you're saving all the data to the same place ($data[0] through $data[5]), so all but the last row is getting overwritten.
This might work better:
$data = array();
while($row = mysql_fetch_assoc($result)) {
$data[] = $row;
}
Using PDO and what other people have posted try using this
public function getdata(){
$connectObj=new dbConnection();
//its a connection class where mysql connection has been made
if(!$connectObj->connectDB()){
echo "Error in mysql: ".mysql_error();
return false;
}
else{
$query = 'select * from tbl_cartypes';
$result = $connectObj->query($query);
$data = array()
foreach ($result as $row){
array_push($data, $row)
}
return $data;
}
$connectObj->closeDB();
}
Your problem is that you're overwriting the values of the previous table:
while($row = mysql_fetch_assoc($result)){
$data[0] = $row['car_id'];
$data[1] = $row['car_name'];
$data[2] = $row['car_model'];
$data[3] = $row['car_type'];
$data[4] = $row['car_price'];
}
This will just re-write the last row of data over the key's in that table.
Try:
$data = array()
while($row = mysql_fetch_assoc($result)){
array_push($data, $row)
}
Your while loop is assigning just one row to array $data. in while loop instead try this
while($row = mysql_fetch_assoc($result)){
$data["car_id"][] = $row['car_id'];
$data["car_name"][] = $row['car_name'];
$data["car_model"][] = $row['car_model'];
$data["car_type"][] = $row['car_type'];
$data["car_price"][] = $row['car_price'];
}
return $data;
Now you can iterate through the array.
How do I use the json_encode() function with MySQL query results? Do I need to iterate through the rows or can I just apply it to the entire results object?
$sth = mysqli_query($conn, "SELECT ...");
$rows = array();
while($r = mysqli_fetch_assoc($sth)) {
$rows[] = $r;
}
print json_encode($rows);
The function json_encode needs PHP >= 5.2 and the php-json package - as mentioned here
NOTE: mysql is deprecated as of PHP 5.5.0, use mysqli extension instead http://php.net/manual/en/migration55.deprecated.php.
Try this, this will create your object properly
$result = mysql_query("SELECT ...");
$rows = array();
while($r = mysql_fetch_assoc($result)) {
$rows['object_name'][] = $r;
}
print json_encode($rows);
http://www.php.net/mysql_query says "mysql_query() returns a resource".
http://www.php.net/json_encode says it can encode any value "except a resource".
You need to iterate through and collect the database results in an array, then json_encode the array.
When using PDO
Use fetchAll() to fetch all rows as an associative array.
$stmt = $pdo->query('SELECT * FROM article');
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($rows);
When your SQL has parameters:
$stmt = $pdo->prepare('SELECT * FROM article WHERE id=?');
$stmt->execute([1]);
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($rows);
When you need to rekey the table you can use foreach loop and build the array manually.
$stmt = $pdo->prepare('SELECT * FROM article WHERE id=?');
$stmt->execute([1]);
$rows = [];
foreach ($stmt as $row) {
$rows[] = [
'newID' => $row['id'],
'Description' => $row['text'],
];
}
echo json_encode($rows);
When using mysqli
Use fetch_all() to fetch all rows as an associative array.
$res = $mysqli->query('SELECT * FROM article');
$rows = $res->fetch_all(MYSQLI_ASSOC);
echo json_encode($rows);
When your SQL has parameters you need to perform prepare/bind/execute/get_result.
$id = 1;
$stmt = $mysqli->prepare('SELECT * FROM article WHERE id=?');
$stmt->bind_param('s', $id); // binding by reference. Only use variables, not literals
$stmt->execute();
$res = $stmt->get_result(); // returns mysqli_result same as mysqli::query()
$rows = $res->fetch_all(MYSQLI_ASSOC);
echo json_encode($rows);
When you need to rekey the table you can use foreach loop and build the array manually.
$stmt = $mysqli->prepare('SELECT * FROM article WHERE id=?');
$stmt->bind_param('s', $id);
$stmt->execute();
$res = $stmt->get_result();
$rows = [];
foreach ($res as $row) {
$rows[] = [
'newID' => $row['id'],
'Description' => $row['text'],
];
}
echo json_encode($rows);
When using mysql_* API
Please, upgrade as soon as possible to a supported PHP version! Please take it seriously. If you need a solution using the old API, this is how it could be done:
$res = mysql_query("SELECT * FROM article");
$rows = [];
while ($row = mysql_fetch_assoc($res)) {
$rows[] = $row;
}
echo json_encode($rows);
if ($result->num_rows > 0) {
# code...
$arr = [];
$inc = 0;
while ($row = $result->fetch_assoc()) {
# code...
$jsonArrayObject = (array('lat' => $row["lat"], 'lon' => $row["lon"], 'addr' => $row["address"]));
$arr[$inc] = $jsonArrayObject;
$inc++;
}
$json_array = json_encode($arr);
echo $json_array;
} else {
echo "0 results";
}
The code below works fine here!
<?php
$con=mysqli_connect("localhost",$username,$password,databaseName);
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$query = "the query here";
$result = mysqli_query($con,$query);
$rows = array();
while($r = mysqli_fetch_array($result)) {
$rows[] = $r;
}
echo json_encode($rows);
mysqli_close($con);
?>
The above will not work, in my experience, before you name the root-element
in the array to something, I have not been able to access anything in the
final json before that.
$sth = mysql_query("SELECT ...");
$rows = array();
while($r = mysql_fetch_assoc($sth)) {
$rows['root_name'] = $r;
}
print json_encode($rows);
That should do the trick!
<?php
define('HOST', 'localhost');
define('USER', 'root');
define('PASS', '');
define('DB', 'dishant');
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$con = mysqli_connect(HOST, USER, PASS, DB);
$sql = "select * from demo ";
$sth = mysqli_query($con, $sql);
$rows = array();
while ($r = mysqli_fetch_array($sth, MYSQLI_ASSOC)) {
$row_array['id'] = $r;
array_push($rows, $row_array);
}
echo json_encode($rows);
array_push($rows,$row_array); helps to build an array otherwise it gives the last value in the while loop.
This works like append method of StringBuilder in Java.
My simple fix to stop it putting speech marks around numeric values...
while($r = mysql_fetch_assoc($rs)){
while($elm=each($r))
{
if(is_numeric($r[$elm["key"]])){
$r[$elm["key"]]=intval($r[$elm["key"]]);
}
}
$rows[] = $r;
}
Sorry, this is extremely long after the question, but:
$sql = 'SELECT CONCAT("[", GROUP_CONCAT(CONCAT("{username:'",username,"'"), CONCAT(",email:'",email),"'}")), "]")
AS json
FROM users;'
$msl = mysql_query($sql)
print($msl["json"]);
Just basically:
"SELECT" Select the rows
"CONCAT" Returns the string that results from concatenating (joining) all the arguments
"GROUP_CONCAT" Returns a string with concatenated non-NULL value from a group
One more option using FOR loop:
$sth = mysql_query("SELECT ...");
for($rows = array(); $row = mysql_fetch_assoc($sth); $rows[] = $row);
print json_encode($rows);
The only disadvantage is that loop for is slower then e.g. while or especially foreach
For example
$result = mysql_query("SELECT * FROM userprofiles where NAME='TESTUSER' ");
1.) if $result is only one row.
$response = mysql_fetch_array($result);
echo json_encode($response);
2.) if $result is more than one row. You need to iterate the rows and save it to an array and return a json with array in it.
$rows = array();
if (mysql_num_rows($result) > 0) {
while($r = mysql_fetch_assoc($result)) {
$id = $r["USERID"]; //a column name (ex.ID) used to get a value of the single row at at time
$rows[$id] = $r; //save the fetched row and add it to the array.
}
}
echo json_encode($rows);
I solved like this
$stmt->bind_result($cde,$v_off,$em_nm,$q_id,$v_m);
$list=array();
$i=0;
while ($cresult=$stmt->fetch()){
$list[$i][0]=$cde;
$list[$i][1]=$v_off;
$list[$i][2]=$em_nm;
$list[$i][3]=$q_id;
$list[$i][4]=$v_m;
$i=$i+1;
}
echo json_encode($list);
This will be returned to ajax as result set
and by using json parse in javascript part like this :
obj = JSON.parse(dataX);
we could simplify Paolo Bergantino answer like this
$sth = mysql_query("SELECT ...");
print json_encode(mysql_fetch_assoc($sth));
We shouldn't see any use of mysql_ functions in modern applications, so either use mysqli_ or pdo functions.
Explicitly calling header("Content-type:application/json"); before outputting your data payload is considered to be best practice by some devs. This is usually not a requirement, but clarifies the format of the payload to whatever might be receiving it.
Assuming this is the only data being printed, it is safe to print the json string using exit() which will terminate the execution of the script as well. This, again, is not essential because echo will work just as well, but some devs consider it a good practice to explicitly terminate the script.
MySQLi single-row result set from query result set object:
exit(json_encode($result->fetch_assoc())); // 1-dimensional / flat
MySQLi multi-row result set from query result set object:
Prior to PHP 8.1.0, available only with mysqlnd.
exit(json_encode($result->fetch_all(MYSQLI_ASSOC))); // 2-dimensional / array of rows
MySQLi single-row result set from prepared statement:
$result = $stmt->get_result();
exit(json_encode($result->fetch_assoc())); // 1-dimensional / flat
MySQLi multi-row result set from prepared statement:
$result = $stmt->get_result();
exit(json_encode($result->fetch_all(MYSQLI_ASSOC))); // 2-dimensional / array of rows
PDO single-row result set from query result set object:
exit(json_encode($result->fetch(PDO::FETCH_ASSOC))); // 1-dimensional / flat
PDO multi-row result set from query result set object:
exit(json_encode($result->fetchAll(PDO::FETCH_ASSOC))); // 2-dimensional / array of rows
PDO single-row result set from prepared statement:
exit(json_encode($stmt->fetch(PDO::FETCH_ASSOC))); // 1-dimensional / flat
PDO multi-row result set from prepared statement:
exit(json_encode($stmt->fetchAll(PDO::FETCH_ASSOC))); // 2-dimensional / array of rows
Obey these rules to prevent the possibility of generating invalid json.:
you should only call json_encode() after you are completely finished manipulating your result array and
you should always use json_encode() to encode the payload (avoid the urge to manually craft a json string using other string functions or concatenation).
If you need to iterate your result set data to run php functions or provide functionality that your database language doesn't offer, then you can immediately iterate the result set object with foreach() and access values using array syntax -- e.g.
$response = [];
foreach ($result as $row) {
$row['col1'] = someFunction($row['id']);
$response[] = $row;
}
exit(json_encode($response));
If you are calling json_encode() on your data payload, then it won't make any difference to whether the payload is an array of arrays or an array of objects. The json string that is created will have identical syntax.
You do not need to explicitly close the database connection after you are finished with the connection. When your script terminates, the connection will be closed for you automatically.
Considering there's not really any NESTED json objects in mysql in general etc., it's fairly easy to make your own encoding function
First, the function to retrieve the mysqli results in an array:
function noom($rz) {
$ar = array();
if(mysqli_num_rows($rz) > 0) {
while($k = mysqli_fetch_assoc($rz)) {
foreach($k as $ki=>$v) {
$ar[$ki] = $v;
}
}
}
return $ar;
}
Now, function to encode array as json:
function json($ar) {
$str = "";
$str .= "{";
$id = 0;
foreach($ar as $a=>$b) {
$id++;
$str .= "\"".$a."\":";
if(!is_numeric($b)) {
$str .= "\"".$b."\"";
} else {
$str .= $b;
}
if($id < count($ar)) {
$str .= ",";
}
}
$str .= "}";
return $str;
}
Then to use it:
<?php
$o = new mysqli(
"localhost",
"root",""
);
if($o->connect_error) {
echo "DUDE what are you/!";
} else {
$rz = mysqli_query($o,
"SELECT * FROM mydatabase.mytable"
);
$ar = noom($rz);
echo json($ar);
}
?>