CODEWITHSUNDEEP
phpmysqlpdo
Simone
Simone

Reputation: 21292

How can I get column names from PDOStatement?

I've recently built a class for automatic paging and ordering of query results, that works with PDO.

Here's how I retrieve the data from a MySQL table:

$this->query = "SELECT _id, name, price, creationDate, isPublished FROM fruits";
$this->fetch_type = PDO::FETCH_ASSOC;
$this->result = $db->query($this->query);
$this->rows = $this->result->fetchAll($this->fetch_type);
$this->columns = empty($this->rows) ? array() : array_keys($this->rows[0]);

This way I can easily store the column names inside an array (that's exactly what I need):

var_dump($this->columns):

array
  0 => string '_id' (length=3)
  1 => string 'name' (length=4)
  2 => string 'price' (length=5)
  3 => string 'creationDate' (length=12)
  4 => string 'isPublished' (length=11)

However, my method doesn't work if the fetch type is PDO::FETCH_OBJ, since I'm no more working with 2D arrays, but with objects inside arrays:

var_dump($this->rows):

array
 0 => 
object(stdClass)[11]
  public '_id' => string '1' (length=1)
  public 'name' => string 'apple' (length=5)
  public 'price' => string '26.00' (length=5)
  public 'creationDate' => string '0000-00-00 00:00:00' (length=19)
  public 'isPublished' => string '1' (length=1)
 1 => 
object(stdClass)[12]
  public '_id' => string '2' (length=1)
  public 'name' => string 'banana' (length=11)
  public 'price' => string '15.00' (length=5)
  public 'creationDate' => string '0000-00-00 00:00:00' (length=19)
  public 'isPublished' => string '1' (length=1)
 2 => 
object(stdClass)[13]
  public '_id' => string '3' (length=1)
  public 'name' => string 'orange' (length=6)
  public 'price' => string '12.12' (length=5)
  public 'creationDate' => string '0000-00-00 00:00:00' (length=19)
  public 'isPublished' => string '1' (length=1)

  etc...

So, how can I get column names from a result like this above?

Upvotes: 2

Views: 9784

Answers (2)

Harald Brinkhof
Harald Brinkhof

Reputation: 4455

getColumnMeta can retrieve the name of a column, it returns an associative array containing amongst others the obvious "name" key.

so

$meta = $this->result->getColumnMeta(0); // 0 indexed so 0 would be first column
$name = $meta['name'];

Upvotes: 5

DaveRandom
DaveRandom

Reputation: 88697

The simple answer to this is to cast the item that you pass to array_keys() to an explicit (array) - that way, arrays are unaffected but objects become the correct type:

$this->columns = empty($this->rows) ? array() : array_keys((array) $this->rows[0]);

Upvotes: 5

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