将一个表中的列与另一个表进行匹配

Question

Sorry for the confusing title, let me try to explain. The question relates to custom logging software where a company can design their own 'log'. Each log has a corresponding metadata table that has the columns from their log in it.

I am using php to render out a display of the data in the log. I first access the column names in the meta table and use that to build the table headers with a foreach as shown

foreach ($logStructure as $header)
{
   echo '<th>' . $header['label'] . '</th>';
}
endforeach;  

Now I have done another select from the actual log for the rows to display and have that in an array call $logrow. How do I go about iterating through those rows and putting the right data in the right column? In SQl I would have used a WHERE Clause to say something to the equivalent of the following:

'WHERE $logrow['fieldname'] = $header['label']'

As an example the metatable fields look like this

[metaid] [columnLabel] [columnNameInData]
   001     Log Number       logNum
   002       Author        CreateUser
   003       Subject        Entry

The data gets put into the $header[] via a statement like such

SELECT columnLabel AS label FROM metatable;

The Log Structure Looks Like This

[logNum]  [CreateUser]       [Entry]
   001       Admin       Some Text about Stuff
   002      Editor 1     Another Amazing Entry
   003      Editor 2      It gets old by now

So the select looks like this

SELECT logNum, CreateUser, Entry FROM log 

The data gets put into $logrow['lognum'], $logrow['CreateUser'], $logrow['Entry']

Hopefully this clears the question up a little better, I'm looking to match the column names in metadata with the values from those fields in the actual data.

Answer 1

If the sequence is gonna be always the same, and you are only trying to render it in the same table, I don't see what's stopping you to read both out into 2 separate arrays, then plot it onto the table.

First this:

SELECT columnNameInData FROM metatable ORDER BY metaid;

put the result into an array $sort

Then implode it and build your second select clause:

$columns=implode(', ', $sort);
$SQL="SELECT $columns FROM log";

And read the result into array $result2

Finally, assemble the header you have and the output of the $result2 as the rows and tds of logs, this table should have the records aligned with the headers.