dataset

问题 I have a Windows Forms application with a DataGridView in one of the forms. The DataGridView can insert and update through a Typed Data Set generated by Visual Studio. I want to show user friendly error messages when a user doesnt fill in a required field or enters the wrong data type, etc. instead of the ugly huge one that is shown by default. This page here gives some guidance. It advises me to validate input on my data sources property setters. How can I do this with a typed dataset? I am

问题 I am using Jena TDB (1.1.1) to store a set of named graphs. Everything works fine but whenever I retrieve a named graph from the the dataset, all the namespace prefix information is lost. Is there a way to preserve the namespace prefixes in the original RDF graph. Following code snippet shows the issue. @Test public void testPreserveNsPrefixes(){ String modelText = "@prefix ro: <http://purl.org/wf4ever/ro#> ." + "@prefix ore: <http://www.openarchives.org/ore/terms/> ." + "@prefix ldp: <http:/

问题 I want to remove the diffgram and NewDataSet tag from xml. <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <NewDataSet> <MACNET diffgr:id="MACNET1" msdata:rowOrder="0" diffgr:hasChanges="inserted"> <BATCH_ID>131070</BATCH_ID> <BATCH_Date_Submitted>12/1/2014 7:36:06 AM</BATCH_Date_Submitted> <BATCH_Date_Received>12/1/2014 7:36:06 AM</BATCH_Date_Received> </MACNET> </NewDataSet> </diffgr:diffgram> I have generated

问题 I want to remove the diffgram and NewDataSet tag from xml. <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <NewDataSet> <MACNET diffgr:id="MACNET1" msdata:rowOrder="0" diffgr:hasChanges="inserted"> <BATCH_ID>131070</BATCH_ID> <BATCH_Date_Submitted>12/1/2014 7:36:06 AM</BATCH_Date_Submitted> <BATCH_Date_Received>12/1/2014 7:36:06 AM</BATCH_Date_Received> </MACNET> </NewDataSet> </diffgr:diffgram> I have generated

问题 I'm having some trouble getting my DataSet to work. I have a MDB-Database in the background and created a DataSet out of it. Now I created a new method that lets me create a new user in the table. But when I call it, nothing happens. No exceptions, no errors and I even get "1" returned as number of affected rows. But when I look in the database, no user was added. I have the feeling that I miss to somehow tell the DataSet that I want to operate the Database itself rather than just the

问题 I am importing data from a single data set in my crystal reports. I have just a single column table in my report. I want to arrange some data vertically say 10 rows of the table (In two vertical lines) and some data horizontally say next 10 rows of the same table (In two horizontal lines). I have managed to do the first part that is arranged the vertical lines side by side (By using the option Format With Multiple Columns in the section expert. I am facing difficulty in arranging horizontal

问题 Existing app passes XML to a sproc in SQLServer 2000, input parameter data type is TEXT; The XML is derived from Dataset.GetXML(). But I notice it doesn't specify an encoding. So when the user sneaks in an inappropriate character into the dataset, specifically ASCII 146 (which appears to be an apostrophe) instead of ASCII 39 (single quote), the sproc fails. One approach is to prefix the result of GetXML with <?xml version="1.0" encoding="ISO-8859-1"?> It works in this case, but what would be

问题 How to get DataType specific DataTable from XML This is my code string XMLReportFormat =@"<?xml version="1.0" encoding="utf-8" ?> <Table> <ReportBody> <TableRow> <ID>1</ID> <ParentID>1</ParentID> <Key>First1</Key> </TableRow> <TableRow> <ID>4</ID> <ParentID>1</ParentID> <Key>FirstChild4</Key> </TableRow> </ReportBody> </Table>"; StringReader sReader = new StringReader(XMLReportFormat); DataSet ds = new DataSet(); if (sReader == null) return null; ds.ReadXml(sReader); Here I am getting all

问题 I have two dataset A and B that contains values and coordonates A: ╔═══╦════════════╦═════════════╦═════════════╗ ║ ║ name ║ x ║ y ║ ╠═══╬════════════╬═════════════╬═════════════╣ ║ 1 ║ city ║ 50.3 ║ 4.2 ║ ║ 2 ║ farm ║ 14.8 ║ 8.6 ║ ║ 3 ║ lake ║ 18.7 ║ 9.8 ║ ║ 3 ║ Mountain ║ 44 ║ 9.8 ║ ╚═══╩════════════╩═════════════╩═════════════╝ B: ╔═══╦════════════╦═════════════╦═════════════╗ ║ ║ Temp ║ x ║ y ║ ╠═══╬════════════╬═════════════╬═════════════╣ ║ 1 ║ 18 ║ 50.7 ║ 6.2 ║ ║ 2 ║ 17,3 ║ 20 ║ 11 ║ ║

问题 I am trying to put all the #keywords from the tweetText into a separate column along with other columns. I have not mentioned other columns as they would only create confusion. The tweetText which does not have #keywords shall be deleted and those which have shall be fished out and put them in different column. I am kind of lost in the part where I need to filter the #Keywords from the tweetText . Input: TweetsID, Tweets (has many more columns) 714602054988275712,I'm at MK Appartaments in