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  • Building an Oracle (and other RDBMS) Server Environment

    In previous articles discussing Oracle and VMware, the hardware and software components consisted of a Windows-based PC and the Oracle RDBMS. Steve Callan expands upon the "Oracle in a virtualized environment" concept by looking at other alternatives for the hardware and software.

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  • Android XML Parser Performance

    Shane Conder will show us how different XML parsers affect performance with Android and the answers might surprise you. The article provides developers with data for choosing a particular XML parser and Android code that demonstrates all three parsers.

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  • Using RDFa with DITA and DocBook

    Learn how to add RDFa metadata to DITA and DocBook documents, how to keep those documents valid, and what advantages this technique can bring to a DITA- or DocBook-based publishing system.

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  • The New Face of Autism Therapy

    <b>Popsci:</b> "With one in 110 children diagnosed with autism, and therapists in short supply, researchers are developing humanoids to fill the gaps. But can robots help patients forge stronger bonds with people? "

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  • A Look at the GridView&apos;s New Sorting Styles in ASP.NET 4.0

    Like every Web control in the ASP.NET toolbox, the GridView includes a variety of style-related properties, including <code>CssClass</code>, <code>Font</code>, <code>ForeColor</code>, <code>BackColor</code>, <code>Width</code>, <code>Height</code>, and so on. The GridView also includes style properties that apply to certain classes of rows in the grid, such as <code>RowStyle</code>, <code>AlternatingRowStyle</code>, <code>HeaderStyle</code>, and <code>PagerStyle</code>. Each of these meta-style properties offer the standard style properties (<code>CssClass</code>, <code>Font</code>, etc.) as subproperties.In ASP.NET 4.0, Microsoft added four new

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  • The iPad's Linux Competition

    <b>Cyber Cynic:</b> "But, the $499 price-tag give me pause, and I'm not crazy about Apple's locked-door policy towards developers and their iPad applications. That's why I've been looking forward to the other cheaper, more open, and Linux-based tablets."

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  • How to force ADO.Net to use only the System.String DataType in the readers TableSchema.

    - by Keith Sirmons
    Howdy, I am using an OleDbConnection to query an Excel 2007 Spreadsheet. I want force the OleDbDataReader to use only string as the column datatype. The system is looking at the first 8 rows of data and inferring the data type to be Double. The problem is that on row 9 I have a string in that column and the OleDbDataReader is returning a Null value since it could not be cast to a Double. I have used these connection strings: Provider=Microsoft.ACE.OLEDB.12.0;Data Source="ExcelFile.xlsx";Persist Security Info=False;Extended Properties="Excel 12.0;IMEX=1;HDR=No" Provider=Microsoft.Jet.OLEDB.4.0;Data Source="ExcelFile.xlsx";Persist Security Info=False;Extended Properties="Excel 8.0;HDR=No;IMEX=1" Looking at the reader.GetSchemaTable().Rows[7].ItemArray[5], it's dataType is Double. Row 7 in this schema correlates with the specific column in Excel I am having issues with. ItemArray[5] is its DataType column Is it possible to create a custom TableSchema for the reader so when accessing the ExcelFiles, I can treat all cells as text instead of letting the system attempt to infer the datatype? I found some good info at this page: Tips for reading Excel spreadsheets using ADO.NET The main quirk about the ADO.NET interface is how datatypes are handled. (You'll notice I've been carefully avoiding the question of which datatypes are returned when reading the spreadsheet.) Are you ready for this? ADO.NET scans the first 8 rows of data, and based on that guesses the datatype for each column. Then it attempts to coerce all data from that column to that datatype, returning NULL whenever the coercion fails! Thank you, Keith Here is a reduced version of my code: using (OleDbConnection connection = new OleDbConnection(BuildConnectionString(dataMapper).ToString())) { connection.Open(); using (OleDbCommand cmd = new OleDbCommand()) { cmd.Connection = connection; cmd.CommandText = SELECT * from [Sheet1$]; using (OleDbDataReader reader = cmd.ExecuteReader()) { using (DataTable dataTable = new DataTable("TestTable")) { dataTable.Load(reader); base.SourceDataSet.Tables.Add(dataTable); } } } }

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