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Old July 14th, 2003, 07:05 PM
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Default SQL insert syntax


I have a database of articles. Articles are categorised by topic. I'm trying to produce a list of these articles, grouped by their respective topics.

$sql="SELECT DISTINCT topicID, topicName FROM topics";
while($query_data = mysql_fetch_array($result))
echo $query_data['topicName']."<br>";

$sql2="SELECT articles.articleID, title FROM articles INNER JOIN
articles_topics ON articles.articleID = articles_topics.articleID
WHERE articles_topics.topicID=$query_data['topicID']";

while($query_data2 = mysql_fetch_array($result2)) {
echo $query_data2['title'];

I've substituted numbers in the SQL statements and tested them in phpMyAdmin where they work fine. But when I try to use the code above, I get "mysql_fetch_array(): supplied argument is not a valid MySQL result resource in the line, "while($query_data2 = mysql_fetch_array($result2))".

I think the problem actually lies in $sql2 where I use "$query_data['topicID']" in the WHERE clause - but I'm not sure. Can anyone tell me what's wrong?
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Old July 15th, 2003, 01:04 PM
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Your hunch is correct -- you're parsing a variable within a string, so you don't need the single quotes.

"SELECT ... topicID = $query_data[topicID]";

Alternatively, you can use curly-brace syntax:

"SELECT ... topicID = {$query_data['topicID']}";

Read the manual at http://www.php.net/types.string

Take care,

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