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  • Managing Unique IDs in stateless (web) DB4O applications

    - by Phil.Wheeler
    I'm playing around with building a new web application using DB4O - piles of fun and some really interesting stuff learned. The one thing I'm struggling with is DB4O's current lack of support for stateless applications (i.e. web apps, mostly) and the need for automatically-generated IDs. There are a number of creative and interesting approaches that I've been able to find that hook into DB4O's events, use GUIDs rather than numeric IDs or for whatever reason avoid using any system of ID at all. While each approach has its merits, I'm wondering if the less-elegant approach might equally be the best fit. Consider the following pseudo-code: If ID == 0 or null Set ID = (typeof(myObject)).Count myObject.Save It seems like such a blindingly simple approach, it's usually about here that I start thinking, "I've missed something really obvious". Have I?

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  • MySQL column not found

    - by vian
    The SQL query without where statement runs great and outputs good results, but when I include WHERE condition it shows Unknown column 'date1' in 'where clause'. What's the problem? SELECT IF(e.weekly, DATE_ADD(DATE(e.time), INTERVAL CEIL(DATEDIFF('2010-04-08', e.time)/7) WEEK), DATE(e.time)) AS `e.date1`, `v`.`lat`, `v`.`lng` FROM `events` AS `e` INNER JOIN `venues` AS `v` ON e.venue_id = v.id WHERE e.date1 > '2010-09-01'

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  • NHibernate MySQL Mapping Set Column Type

    - by LnDCobra
    In my MySQL database, I have the following column type. Field | Type | Null | ---------------------------------- Column_priv | set('Select','Insert','Update','References') | No | And I cannot figure out what to map this to. Can anyone tell me how I can map this to something?

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  • Create a Cumulative Sum Column in MySQL

    - by Kirk
    I have a table that looks like this: id count 1 100 2 50 3 10 I want to add a new column called cumulative_sum, so the table would look like this: id count cumulative_sum 1 100 100 2 50 150 3 10 160 Is there a MySQL update statement that can do this easily? What's the best way to accomplish this?

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  • Creating a column of RadioButtons in Adobe Flex

    - by adnan
    I am having an un-predictable behavior of creating radio buttons in advancedDataGrid column using itemRenderer. Similar kind of problem has been reported at http://stackoverflow.com/questions/112036/creating-a-column-of-radiobuttons-in-adobe-flex. I tried to use the same procedure i.e. bind every radio button selectedValue and value attributes with the property specified in the property of the associated bean but still facing the problem. The button change values! The selected button becomes deselected, and unselected ones become selected. Here is the code of my advancedDataGrid: <mx:AdvancedDataGrid id="adDataGrid_rptdata" width="100%" height="100%" dragEnabled="false" sortableColumns="false" treeColumn="{action}" liveScrolling="false" displayItemsExpanded="true" > <mx:dataProvider> <mx:HierarchicalData source="{this.competenceCollection}" childrenField="competenceCriteria"/> </mx:dataProvider> <mx:columns> <mx:AdvancedDataGridColumn headerText="" id="action" dataField="criteriaName" /> <mx:AdvancedDataGridColumn headerText="Periode 1" dataField="" width="200"> <mx:itemRenderer> <mx:Component> <mx:HBox horizontalAlign="center" width="100%" verticalAlign="middle"> <mx:RadioButton name="period1" value="{data}" selected="{data.period1}" group="{data.radioBtnGrpArray[0]}" visible="{data.showRadioButton}" /> </mx:HBox> </mx:Component> </mx:itemRenderer> </mx:AdvancedDataGridColumn> <mx:AdvancedDataGridColumn headerText="Periode 2" dataField="" width="200"> <mx:itemRenderer> <mx:Component> <mx:HBox horizontalAlign="center" width="100%" verticalAlign="middle"> <mx:RadioButton name="period2" value="{data}" selected="{data.period2}" group="{data.radioBtnGrpArray[1]}" visible="{data.showRadioButton}" /> </mx:HBox> </mx:Component> </mx:itemRenderer> </mx:AdvancedDataGridColumn> <mx:AdvancedDataGridColumn headerText="Periode 3" dataField="" width="200"> <mx:itemRenderer> <mx:Component> <mx:HBox horizontalAlign="center" width="100%" verticalAlign="middle"> <mx:RadioButton name="period3" value="{data}" selected="{data.period3}" group="{data.radioBtnGrpArray[2]}" visible="{data.showRadioButton}" /> </mx:HBox> </mx:Component> </mx:itemRenderer> </mx:AdvancedDataGridColumn> </mx:columns> </mx:AdvancedDataGrid> Any work around is highly appreciated in this regard!

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  • Finding a certain cell in gridview through the use of column and row

    - by newName
    I have a populated gridview that consist of template fields. I would like to find/check a certain number of cells using values of rows and columns. Eg: |Time|col1|col2|col3|col4|col5| |1200|------|-----|-----|------|-----| |1300|------| -X- |-----|------|-----| |1400|------|-----|-----|------|-----| lets say i have the value "1300" for the row and the column header text "col2", I would like to find the cell marked "X" and check for some condition and change the text if necessary (col1 - col5 are template fields made up of labels and buttons, so therefore base on certain conditions i would like to show/hide the labels/buttons or change the text for the labels) Thanks

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  • CollectionViewSource & Selective Column Display

    - by Berryl
    By selective column display i mean the following: a control shows a listing of widgets (WidgetVm.DisplayName), with the default display name being in English (WidgetVm.EnglishName), but with the option to show the widget in French (WidgetVm.FrenchName). There also sorting and filtering available, which is why CollectionViewSource seems ideal. I know you can have multiple views over the same source but I haven't figured out how to do this yet. Is that the right approach to solving this? How? Cheers, Berryl

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  • Any way to automatically wrap comments at column 80 in Visual Studio 2008? ..or display where column

    - by Jon Cage
    Is there any way to automatically wrap comments at the 80-column boundary as you type them? ..or failing that, any way to display a faint line at the coulmn 80 boundary to make wrapping them manually a little easier? Several other IDEs I use have one or other of those functions and it makes writing comments that wrap in sensible places much easier/quicker. [Edit] If (like me) you're using Visual C++ Express, you need to change the VisualStudio part of the key into VCExpress - had me confused for a while there!

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  • Prevent SQL Injection in Dynamic column names

    - by Mr Shoubs
    I can't get away without writing some dynamic sql conditions in a part of my system (using Postgres). My question is how best to avoid SQL Injection with the method I am currently using. EDIT (Reasoning): There are many of columns in a number of tables (a number which grows (only) and is maintained elsewhere). I need a method of allowing the user to decide which (predefined) column they want to query (and if necessary apply string functions to). The query itself is far too complex for the user to write themselves, nor do they have access to the db. There are 1000's of users with varying requirements and I need to remain as flexible as possible - I shouldn't have to revisit the code unless the main query needs to change - Also, there is no way of knowing what conditions the user will need to use. I have objects (received via web service) that generates a condition (the generation method is below - it isn't perfect yet) for some large sql queries. The _FieldName is user editable (parameter name was, but it didn't need to be) and I am worried it could be an attack vector. I put double quotes (see quoted identifier) around the field name in an attempt to sanitize the string, this way it can never be a key word. I could also look up the field name against a list of fields, but it would be difficult to maintain on a timely basis. Unfortunately the user must enter the condition criteria, I am sure there must be more I can add to the sanatize method? and does quoting the column name make it safe? (my limited testing seems to think so). an example built condition would be "AND upper(brandloaded.make) like 'O%' and upper(brandloaded.make) not like 'OTHERBRAND'" ... Any help or suggestions are appreciated. Public Function GetCondition() As String Dim sb As New Text.StringBuilder 'put quote around the table name in an attempt to prevent some sql injection 'http://www.postgresql.org/docs/8.2/static/sql-syntax-lexical.html sb.AppendFormat(" {0} ""{1}"" ", _LogicOperator.ToString, _FieldName) Select Case _ConditionOperator Case ConditionOperatorOptions.Equals sb.Append(" = ") ... End Select sb.AppendFormat(" {0} ", Me.UniqueParameterName) 'for parameter Return Me.Sanitize(sb) End Function Private Function Sanitize(ByVal sb As Text.StringBuilder) As String 'compare against a similar blacklist mentioned here: http://forums.asp.net/t/1254125.aspx sb.Replace(";", "") sb.Replace("'", "") sb.Replace("\", "") sb.Replace(Chr(8), "") Return sb.ToString End Function Public ReadOnly Property UniqueParameterName() As String Get Return String.Concat(":" _UniqueIdentifier) End Get End Property

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  • Keeping a certain row or column in an HTML table fixed

    - by WarDoGG
    I have huge amounts of data populating an HTML <table> having more than 200 rows and 200 columns. However, when i scroll the page horizontally or vertically to view the data, the header columns (like th for instance) go beyond the page. How can i scroll through the table and still keep the top row and leftmost column fixed so that i will always know what data im seeing.

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  • sqlite3 timestamp column

    - by Flavius
    Hi I feel stupid, but I can't get a TIMESTAMP column to be shown in human understandable way in a SELECT. I could do that in MySQL, not in sqlite3. Could someone show me an example please? Thanks

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  • Different Editors for one column in EditorGridPanel ExtJS

    - by Sloane
    Hi, I am trying to show/load different editor on different rows of a editorgridpanel. Like a textbox on one row combobox/superboxselect on another and it could be any order, random. The conditions which dictate which editor will be shown reside in the database. Please tell me if this is possible and if so, how do i go about it.. I have tried pulling the conditions asynchronously which are pulled on a click event for the respective column, but calling it async causes problems. Please advise

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  • how to make grid column as drop down list for all rows using jquery

    - by kumar
    Hello friends.. colNames: ['A','B','C','D'], colModel: [ { name: 'A', index: 'A', width: 90 }, { name: 'B', index: 'B', width: 100 }, { name: 'C', index: 'C', width: 70 }, { name: 'D', index: 'D', edittype: 'select', width: 100, editoptions: { value: { 1: 'Yes', 2: 'No'}} } ], My concersn here is.. I am displying A B C D values from db2... for Last Column D I need to put defalut drop down list for all the rows. Thanks can any body help me out.. thanks

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