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  • How can several different datatypes be saved in one table

    - by poseidon
    This is my situation: I am constructing an ad-like application in Django and Mysql. I am using a flexible-ad approach where we have: a table with ad categories (several categories such as home, furniture, cars, etc.) id_category name a table with details for the ad categories (home: area, squared meters. car: seats, color.) id_detail id_category (the categ the detail describes) name type (boolean, char, int, long, etc.) the ad table (i am selling a house. i am selling a car.) id_ad id_category text date a table where i plan to consolidate the details of the ads (home: A-area, 500 sq-meters. car: 5 seats, red.) id_detail_ad id_ad id_detail value Is this possible? Can I have a table of details for all the ads, even if details include numbers, texts, booleans, etc? Or would I have to save them all as text and then interpret them via code accordingly? Please express your opinions. Thank you.

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  • ID generator with local static variable - thread-safe?

    - by Poseidon
    Will the following piece of code work as expected in a multi-threaded scenario? int getUniqueID() { static int ID=0; return ++ID; } It's not necessary that the IDs to be contiguous - even if it skips a value, it's fine. Can it be said that when this function returns, the value returned will be unique across all threads?

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  • Extjs Tooltips, IFrames and IE => Problems

    - by Chau
    I have an application using OpenLayers, Extjs and GeoExt. My application runs fine, but I need it to be placed inside an IFrame in another page. When doing this, my toolbar becomes responseless in Internet Explorer. The cause is Ext.QuickTips.init();. Comment out this line and everything works fine - except the quick tips ofcourse =) But why is it causing problems? Is it because I'm using it wrong, placing it wrong or just because it doesn't like IE and IFrames? Link: Link to the IFrame page IFrame page: <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <body> <iframe height="660" src="http://www.gis34.dk/doctype.html" width="660"> <p>Din browser understøtter ikke <i>frames</i>.</p> </iframe> </body> </html> Application page: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script type="text/javascript" language="javascript"> var map; var mapPanel; var mainViewport; var toolbarItems = []; </script> <link href="/Libraries/Ext/resources/css/ext-all.css" type="text/css" rel="stylesheet" /> <link href="/Libraries/GeoExt/resources/css/geoext-all-debug.css" type="text/css" rel="stylesheet" /> <link href="/CSS/Extjs.css" type="text/css" rel="stylesheet" /> <link href="/CSS/OpenLayers.css" type="text/css" rel="stylesheet" /> <link href="/CSS/Poseidon.css" type="text/css" rel="stylesheet" /> </head> <body> <script src="/Libraries/OpenLayers/lib/OpenLayers.js" type="text/javascript"></script> <script src="/Libraries/Ext/adapter/ext/ext-base-debug.js" type="text/javascript"></script> <script src="/Libraries/Ext/ext-all-debug.js" type="text/javascript"></script> <script src="/Libraries/GeoExt/lib/GeoExt.js" type="text/javascript"></script> <script src="http://www.openstreetmap.org/openlayers/OpenStreetMap.js" type="text/javascript"></script> <div id="map"></div> <script type="text/javascript"> Ext.onReady(function() { Ext.QuickTips.init(); Ext.BLANK_IMAGE_URL = '/Libraries/Ext/resources/images/default/s.gif'; var layer = new OpenLayers.Layer.OSM.Mapnik( 'OpenStreetMap Mapnik', { sphericalMercator: true }, { isBaseLayer: true } ); var mapOptions = { projection: 'EPSG:900913', units: 'm', maxExtent: new OpenLayers.Bounds(1390414.0280576,7490505.7050394,1406198.2743956,7501990.3685372), minResolution: '0.125', maxResolution: '1000', restrictedExtent: new OpenLayers.Bounds(1390414.0280576,7490505.7050394,1406198.2743956,7501990.3685372), controls: [ ] }; map = new OpenLayers.Map('', mapOptions); var Navigation = new OpenLayers.Control.Navigation(); action = new GeoExt.Action( { control: new OpenLayers.Control.ZoomBox({out:false}), map: map, tooltip: "Zoom ind", iconCls: 'icon-zoom-in', toggleGroup: 'mapTools', group: 'mapTools' }); toolbarItems.push(action); action = new GeoExt.Action( { control: new OpenLayers.Control.ZoomBox({out:true}), map: map, tooltip: "Zoom ud", iconCls: 'icon-zoom-out', toggleGroup: 'mapTools', group: 'mapTools' }); toolbarItems.push(action); action = new GeoExt.Action({ control: new OpenLayers.Control.ZoomToMaxExtent(), map: map, iconCls: 'icon-zoom-max-extent', tooltip: 'Zoom helt ud' }); toolbarItems.push(action); map.addControl(Navigation); map.addLayer(layer); mapPanel = new GeoExt.MapPanel( { border: true, id: 'mapPanel', region: "center", map: map, tbar: toolbarItems }); mainViewport = new Ext.Viewport( { layout: "fit", hideBorders: true, items: { layout: "border", deferredRender: false, items: [ mapPanel ] } }); }); </script> </body> </html>

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