I'm currently trying to write a simple ORM with PHP and mysql. I want the orm class to be able to work with joined tables. So here's my problem, the following code shows how I map the data the query yields into an array.
public function execute_query($db_connection)
{
$query = '';
foreach($this->sql_query as $query_part)
$query .= $query_part;
$result = $db_connection->query($query);
while($row = $result->fetch_assoc())
{
array_push($this->m_Data, $row);
}
}
db_connection is a mysqli object. sql_query contains all the different query parts (e.g. sql_query['join'] etc.). m_Data is the array that contains the data read from the db.
My specific problem now is when I'm using a join statement in my query this function will just override fields with the same name in my m_Data array. Also if I dont save the name's of the table the specific field data is coming from, I later can't update the tables with the same join statement.
tl,dr. I need to be able to not only save the table data like this: m_Data{ 'field_name' => 'value' } but I also need to save the table name the field is selected from. I could then save the data like this m_Data{ 'table_name.field_name' => 'value' } which enables me later to generate a query to update the joined tables successfully.
I cant seem to find any information on how to get the origin table name for each field I pull out of the result.
If it isnt possible with mysqli I'd much appreciate it if you point me in the right direction.
extra short problem statement: I need to get a result set and read each row seperatly. For each row I need the following information for every field selected: field_name, table_name, value.
There must be a simple answer to this but I seem to be searching for the wrong keywords to find a solution.
I hope I've written this understandable enough.
Seems to me that you should store table column values in an object, so if you have a related table, the column values would be stored in a separate object - and so would not interfere with the values in your primary table.
In general you might work with the ORM this way:
// Make joined query
$rows = ...
foreach($rows as $row)
{
// $row just refers to the primary table
echo $row->id;
// You get a many:1 related table this way
echo $row->getRelatedRow()->value;
// You get a 1:many rows this way
$rows = $row->getOtherRelatedRows();
}
Depending on how you set up your query options, getting related data may or may not initiate further SELECTs to get the required data.
mysqli_result::fetch_fields has useful things:
http://www.php.net/manual/en/mysqli-result.fetch-fields.php