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The code to modify the database (i.e., insert, update, and delete rows of the database) isn t much different from the code to query the database. Obviously, the SQL is different. The only other difference is that you call the SqlCommand class s ExecuteNonQuery() method instead of the ExecuteReader() method. You can still use both CommandTypes and you still need to set up the SQLParameters the same way for stored procedures. In Listing 12-7 you insert a new record into the database, you change the LastName on the record, and then you delete the record. (A lot of work for nothing, don t you think ) Listing 12-7. Modifying the Database using namespace System; using namespace System::Data; using namespace System::Data::SqlClient; void main() { String ^Name = "Doors"; SqlConnection ^connection = gcnew SqlConnection(); #ifdef SQLAuth // SQL Server authentication connection->ConnectionString = "User ID=sa; Password=;" "Data Source=(local); Initial Catalog=DCV_DB;"; #else // Windows Integrated Security connection->ConnectionString = "Persist Security Info=False; Integrated Security=SSPI;" "Data Source=(local); Initial Catalog=DCV_DB;"; #endif try { SqlCommand ^cmd = gcnew SqlCommand(); cmd->Connection = connection; connection->Open(); vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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16 Sep 2008 ... Demonstrates creating EAN - 13 Barcodes with VB . NET . ... programs for hand held devices which came with an integrated barcode reader . The next section explores how to supply construction parameters to objects, as well as how to bind to methods instead of just properties, so we can parameterize our bindings.. Listing 3-7. TradeService using using using using using System; System.Collections; System.ServiceModel; QuickReturns.StockTrading.ExchangeService.Contracts; QuickReturns.StockTrading.ExchangeService.DataContracts; ms word 2010 barcode generator, word ean 13 barcode font, birt data matrix, birt ean 13, word pdf 417, qr code generator word add in vb.net ean 13 reader Read Barcodes from Images C#/ VB . NET - BC.NetBarcodeReader ...
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. cmd->CommandType = CommandType::StoredProcedure; cmd->CommandText = "InsertAuthor"; cmd->Parameters->Add(gcnew SqlParameter("@LastName", SqlDbType::VarChar)); cmd->Parameters->Add(gcnew SqlParameter("@FirstName",SqlDbType::VarChar)); cmd->Parameters["@LastName"]->Value = "Dope"; cmd->Parameters["@FirstName"]->Value = "John"; int affected = cmd->ExecuteNonQuery(); Console::WriteLine("Insert - {0} rows are affected", affected); cmd->CommandType = CommandType::Text; cmd->CommandText = "UPDATE Authors SET LastName = 'Doe'" "WHERE LastName = 'Dope'"; affected = cmd->ExecuteNonQuery(); Console::WriteLine("Update - {0} rows are affected", affected); cmd->CommandType = CommandType::Text; cmd->CommandText = "DELETE FROM Authors WHERE LastName = 'Doe'"; affected = cmd->ExecuteNonQuery(); Console::WriteLine("Delete - {0} rows are affected", affected); } catch (SqlException ^e) { Console::WriteLine("No connection the following error occurred: {0}", e->Message); } finally { connection->Close(); } } As you can see, there is not much new going on here in the C++/CLI code, other than the call to ExecuteNonQuery(). This method returns the number of rows affected by the SQL command. int affected = cmd->ExecuteNonQuery(); Figure 12-11 shows the results of the preceding example program. vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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NET. Free demo download. How to read, scan EAN - 13 linear barcode image in . NET applications ... High-quality barcode reader ; C#, VB . NET sample code ... The final command-executing method of the SqlCommand class is ExecuteScalar(). This method is designed to return an Object handle as the result of the query. The returned Object points to a value like that produced by an aggregated SQL function such as COUNT or SUM. Again, like the database modifying command, there is not much changed between the source code needed to execute this type of method and that of a standard query. Listing 12-8 shows how to count all the records in a database and also how to sum a column. (The database does not have a column that you would want to sum I had to improvise.) Listing 12-8. Counting and Summing using namespace System; using namespace System::Data; using namespace System::Data::SqlClient; void main() { SqlConnection ^connection = gcnew SqlConnection(); #ifdef SQLAuth // SQL Server authentication connection->ConnectionString = "User ID=sa; Password=;" "Data Source=(local); Initial Catalog=DCV_DB;"; #else // Windows Integrated Security connection->ConnectionString = "Persist Security Info=False; Integrated Security=SSPI;" "Data Source=(local); Initial Catalog=DCV_DB;"; #endif try { SqlCommand ^cmd = gcnew SqlCommand(); cmd->Connection = connection; connection->Open(); cmd->CommandType = CommandType::Text; cmd->CommandText = "SELECT COUNT(*) FROM Authors"; Object ^NumAuthors = cmd->ExecuteScalar(); Console::WriteLine("The number of Authors are {0}", NumAuthors); cmd->CommandType = CommandType::Text; cmd->CommandText = "SELECT SUM(AuthorID) FROM Authors"; namespace QuickReturns.StockTrading.ExchangeService { [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ReturnUnknownExceptionsAsFaults=true)] public class TradeService : ITradeService { private Hashtable tickers = new Hashtable(); public Quote GetQuote(string ticker) { lock (tickers) { Object ^UselessNum = cmd->ExecuteScalar(); Console::WriteLine("The Sum of AuthorIDs for fun is {0}", UselessNum); } catch (SqlException ^e) { Console::WriteLine("No connection the following error occurred: {0}", e->Message); } finally { connection->Close(); } } As you can see, other than the SQL code and the calling of the ExecuteScalar() method, there is not much new. The ExecuteScalar() method returns a handle to an Object, which you can type cast to the type of the return value. In both cases, you could have type cast the return Object handle to int, but the WriteLine() method can do it for you. Figure 12-12 shows the results of the preceding example program. vb.net ean 13 reader VB . NET Image: VB Code to Read and Recognize EAN - 13 Barcode from ...
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