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niol
Smarty n00b
Joined: 11 Apr 2005
Posts: 2
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 Posted: Mon Apr 11, 2005 1:00 pm Post subject: Database queries within templates |
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Hi all,
When I discovered the smarty template engine, I lacked a feature I have found in another template engine (Templeet).
So I implemented a basic version of it for the Smarty Template engine.
It basically allows you to perform database queries within a template and do things like this :
| Code: |
{list query="SELECT
news.nid,
news.date,
news.title,
users.login
FROM news,users
WHERE
news.uid = users.uid
ORDER BY date DESC LIMIT 20" prefix="<ul>" trailer="</ul>"}
<li><a href="{include file="news/news_link.tpl" date=$fld.date nid=$fld.nid title=$fld.title}">{$fld.title}</li>
{/list}
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If this is of any interest for anybody, here is the GPLed source code :
[php:1:50b9b3a059]<?php
require_once 'shared.mysql.php';
/*
* Smarty plugin
* -------------------------------------------------------------
* File: block.list.php
* Type: block
* Name: list
* Purpose: This function displays the results of a db quey
* Params:
* - query : The database query
* - prefix : Displayed before the first result row if any
* - trailer : Displayed after the last result row if any
* -------------------------------------------------------------
*/
$smarty_mysql_result = NULL;
function smarty_block_list($params,$content,&$smarty,&$repeat){
global $smarty_mysql_result;
static $mysql_nested_depth = -1;
// Checking whether contents is set tells whether
// it is the beginning of the block or the end.
if (!isset($content)) {
// We are at the beginning of the block
// We go deeper
$mysql_nested_depth++;
$query = $params['query'];
if( DEBUG ) echo "($query)";
// --We do the query
// Run the query
if( !($smarty_mysql_result[$mysql_nested_depth] = smarty_mysql_query($query)) ){
// Query executed improperly
// We climb back
$mysql_nested_depth--;
// Do not repeat
$repeat = false;
}else{
// The query executed okay
// If we have at least one result
if( @mysql_num_rows($smarty_mysql_result[$mysql_nested_depth]) > 0 ){
// Assign the first row for display
$smarty->assign('fld',mysql_fetch_array($smarty_mysql_result[$mysql_nest
ed_depth]));
// We want to repeat
$repeat = true;
// Echo the prefix and return
echo $params['prefix'];
return;
}else{
// Do not repeat, no more content
$repeat = false;
// We climb back
$mysql_nested_depth--;
// Return nothing
return;
}
}
return;// We return nothing in case the function did not exit yet
}else{
// We have more content to display
// Checking for more results
if( $fields = mysql_fetch_array($smarty_mysql_result[$mysql_nested_depth]) ){
// --We have more result rows
// We want to repeat
$repeat = true;
// We assign the row for next display
$smarty->assign('fld',$fields);
// Return the contents with the good variables in it
return $content;
}else{// Last result row
// We climb back
$mysql_nested_depth--;
// Return the contents with the good variables in it and trailer
return $content.$params['trailer'];
}
return;// We return nothing in case the function did not exit yet
}
}
?>
[/php:1:50b9b3a059] |
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messju
Administrator
Joined: 16 Apr 2003
Posts: 3336
Location: Oldenburg, Germany
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| Posted: Mon Apr 11, 2005 4:51 pm Post subject: |
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smarty is built to seperate display-logic from business logic.
your plugin seems to defeat this purpose. |
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niol
Smarty n00b
Joined: 11 Apr 2005
Posts: 2
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| Posted: Mon Apr 11, 2005 6:00 pm Post subject: Right but... |
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I totally agree with you, and as my app is growing, I am beginning to see the limits of this plugin. That is why I am planning to manipulate database items that have a strong meaning using PHP objects.
But this plugin is usefull if the application is small, or if you need to quickly get something from the database. That is why I did not post to the 'Feature request' forum.
But I thought that my code may be usefull someday... |
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