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POPHP + Mysql: dynamic table name from first query for execution of second query
 

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    <p>I have three tables, the first is a table storing applications, the second is a table storing different online forms (different types of applications), the third is a table that stores actual form data:</p> <pre><code> TABLE applications========= -applicationID (PK) -formID (FK) -formRecordID ==================== TABLE forms========= -formID (PK) -formName -tableName (could be 'form_businessLicense','eventLicense',etc) ==================== TABLE form_businessLicense===== -recordID (PK) -dateSubmitted -(a whole bunch of other data) =============================== </code></pre> <p>"formRecordID" points to "recordID" in "form_businessLicense" or "eventLicense". Since it could reference any table, it can't be a foreign key. So instead I grab the tableName from the "forms" table, then build a query to get all the application data from, say "form_businessLicense".</p> <p>So I need to get data from, say, all applications plus a bit of data from the application form filled out (ex:form_businessLicense). I'm just going to paste my code (I'm actually querying all applications in a given set of IDs):</p> <pre><code>$applications = $this-&gt;selectAll( "SELECT applicationID, formName, tableName, fieldIdentifier, formRecordID, dateSubmitted, DATE_FORMAT(dateSubmitted,'%c/%e/%Y') AS dateSubmittedFormat FROM applications AS a JOIN forms AS f ON a.formID = f.formID WHERE a.applicationID IN (".$applicationIDs.") ORDER BY dateSubmitted ASC" ); for($a=0;$a&lt;count($applications);$a++){ $form = $this-&gt;select("SELECT ".$applications[$a]['fieldIdentifier']." AS identifierName FROM ".$applications[$a]['tableName']." WHERE recordID = ".$applications[$a]['formRecordID'] ); $applications[$a]['identifierName'] = $form['identifierName']; } </code></pre> <p>Is there any way to merge these two queries into one so I don't have to loop over all results and run a separate query for each result? I feel like I could maybe do this with a JOIN but I'm not sure how to reference the "tableName" and "formRecordID" for use in the same SQL statement.</p>
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    1. COHow many different `form_*` tables are there?
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    2. COWhy are you using a for loop and not a simple while/foreach. What about you first get a list of table names and id's and then you make an inner join and get all data at once!
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    3. COIt's usually a good design decision to merge all of these dynamically named tables into one generic table. You can then filter and search much easier and wont have any such problems. Such dynamically generated table names, probably with identical structures usually arent a good design decision.
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