dataview

What SQL query or view will show “dynamic columns”

泄露秘密 提交于 2019-11-29 15:20:53
问题 I have a table of data, and I allow people to add meta data to that table. I give them an interface that allows them to treat it as though they're adding extra columns to the table their data is stored in, but I'm actually storing the data in another table. Data Table DataID Data Meta Table DataID MetaName MetaData So if they wanted a table that stored the data, the date, and a name, then I'd have the data in the data table, and the word "Date" in metaname, and the date in MetaData, and

Missing operand after 'Operator Name' operator

南楼画角 提交于 2019-11-29 14:10:39
I am filtering my gridview using dataview. I am passing the filter command to dataview as mentioned below; string strFilter= " 0=0 "; if (Session["SampleSession"] != null) { strFilter= strFilter+ " and Emp Name = '" + Session["SampleSession"].ToString() + "' "; } dv.RowFilter = strFilter; // Throws an error here! It throws an error of Missing operand after 'Operator Name' operator in above line. i believe there is small error which i am unable to catch. Your problem is that "Emp Name" (the column name) contains a space and needs to be wrapped in square brackets in the filter expression:

Compare dates in DataView.RowFilter?

我是研究僧i 提交于 2019-11-29 03:46:51
I am scratching my head over something rather stupid yet apparently difficult. DataView dvFormula = dsFormula.Tables[0].DefaultView; dvFormula.RowFilter = "'" + startDate.ToString("yyyyMMdd") + "' < EndDate OR EndDate = '19000101'"; dvFormula.Sort = "FromDate ASC"; The result is this: Cannot perform '<' operation on System.String and System.DateTime. Please tell me what the best way to solve this problem would be. Much appreciated! Dan You need to wrap your dates with #, not apostrophes. dvFormula.RowFilter = "#" + startDate.ToString("MM/dd/yyyy") + "# < EndDate OR EndDate = #1/1/1900#"; Darsh

How to filter DataView based on multiple inputs

瘦欲@ 提交于 2019-11-28 14:24:15
I know how to filter data based on the user's input from a single textbox: FilterDataView.RowFilter = txtFilter.Text; But how would you go about filtering data based on multiple user input from multiple fields. Basically filter would act as a "search" functionality. You can use something like light t-sql when defining RowFilter. One idea is: FilterDataView.RowFilter = "name like '%habjan%' and city like '%new york%'" Here you can find a good article about RowFilter syntax: DataView RowFilter Syntax For what you need you will have to build row filter based on entered fields. StringBuilder sb =

Looping through rows in a DataView

谁说胖子不能爱 提交于 2019-11-28 08:51:54
The DataView object doesn't have a Rows property like DataTable . How do I loop through the rows of a DataView? The DataView object itself is used to loop through DataView rows. DataView rows are represented by the DataRowView object. The DataRowView.Row property provides access to the original DataTable row. C# foreach (DataRowView rowView in dataView) { DataRow row = rowView.Row; // Do something // } VB.NET For Each rowView As DataRowView in dataView Dim row As DataRow = rowView.Row ' Do something ' Next //You can convert DataView to Table. using DataView.ToTable(); foreach (DataRow drGroup

Missing operand after 'Operator Name' operator

只愿长相守 提交于 2019-11-28 07:58:44
问题 I am filtering my gridview using dataview. I am passing the filter command to dataview as mentioned below; string strFilter= " 0=0 "; if (Session["SampleSession"] != null) { strFilter= strFilter+ " and Emp Name = '" + Session["SampleSession"].ToString() + "' "; } dv.RowFilter = strFilter; // Throws an error here! It throws an error of Missing operand after 'Operator Name' operator in above line. i believe there is small error which i am unable to catch. 回答1: Your problem is that "Emp Name"

Compare dates in DataView.RowFilter?

左心房为你撑大大i 提交于 2019-11-27 22:13:20
问题 I am scratching my head over something rather stupid yet apparently difficult. DataView dvFormula = dsFormula.Tables[0].DefaultView; dvFormula.RowFilter = "'" + startDate.ToString("yyyyMMdd") + "' < EndDate OR EndDate = '19000101'"; dvFormula.Sort = "FromDate ASC"; The result is this: Cannot perform '<' operation on System.String and System.DateTime. Please tell me what the best way to solve this problem would be. Much appreciated! 回答1: You need to wrap your dates with #, not apostrophes.

C#: Custom sort of DataGridView

不问归期 提交于 2019-11-27 13:36:28
I need to sort a DataGridView with Natural Sorting (Like in Explorer) so that numbers and text (in the same column) are sorted naturally, and not alphabetically (so that "place 3" comes before "place 20", etc.). I have a DataGridView, where I have set a DataView as DataSource. The DataView contains a DataTable which is created with some values from a database. The column types are string. I have an IComparer, which does what it should, but I can't figure out how to use it, cause I can't find out how to do the sorting. The DataGridView.SortCompare event, which would be perfect , doesn't work

How to use GWT 2.1 Data Presentation Widgets

…衆ロ難τιáo~ 提交于 2019-11-27 06:11:27
At the 2010 Google IO it was announced that GWT 2.1 would include new Data Presentation Widgets . 2.1M is available for download, and presumably the widgets are included, but no documentation has yet surfaced. Is there a short tutorial or example for how to use them? I've seen a rumor that CellList and CellTable are the classes in question. The Javadoc for them is riddled with lots of TODOs, so quite a bit is still missing in terms of usage. Google I/O 2010 - GWT's UI overhaul javadocs package com.google.gwt.cell.client in 2.1 Eclipse update site for milestone 2 While the code is in bikeshed,

Looping through rows in a DataView

依然范特西╮ 提交于 2019-11-27 02:29:20
问题 The DataView object doesn't have a Rows property like DataTable . How do I loop through the rows of a DataView? 回答1: The DataView object itself is used to loop through DataView rows. DataView rows are represented by the DataRowView object. The DataRowView.Row property provides access to the original DataTable row. C# foreach (DataRowView rowView in dataView) { DataRow row = rowView.Row; // Do something // } VB.NET For Each rowView As DataRowView in dataView Dim row As DataRow = rowView.Row '