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2012-08-20T23:39:17.757
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2012-08-20T23:53:43.593
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2012-08-20T23:53:43.593
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text
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Like a C# <code>DateTime</code> value, a SQL Server <code>DateTime</code> value has no format: it's just a 64-bit field consisting of two 32-bit integers. The first counts days since the epoch (1 January 1900 00:00:00.000); the second counts time since start of day in 1/300ths of a second. You apply formatting when you display it or convert it to char/varchar, either in SQL using <a href="http://msdn.microsoft.com/en-us/library/ms187928%28v=sql.100%29.aspx" rel="nofollow">CONVERT()</a>, or in the client code. Your <code>update</code> statement doesn't care about format: it cares about value. If you pass a C# <code>DateTime</code> value as a <code>SqlParameter</code> to your stored procedure or parameterized query, the Right Thing will happen: the CLR will magically translate the one into the other for you. If, you pass a string as the DateTime parameter from C#, it needs to be in a format that SQL Server will recognize as a DateTime string. Assuming that's the case, the conversion from C# string to SQL Server DateTime value will likewise happen magically. Given your <code>update</code> statement, code something like the following ought to do you: <pre><code>public int UpdateDiscount( int discountPromotionalID , bool isActive , string title , DateTime beginDate , DateTime endDate , int discountPercentage ) { const string updateQuery = @" Update discount set DiscountPromotionalID = @DiscountPromotionalID , isActive = @isActive , Title = @Title , BeginDate = @BeginDate , EndDate = @EndDate , DiscountPercentage = @DiscountPercentage where DiscountPromotionalID = @DiscountPromotionalID " ; int rowsAffected ; using ( SqlConnection connection = new SqlConnection( SomeConnectString ) ) using ( SqlCommand cmd = connection.CreateCommand() ) { cmd.CommandText = updateQuery ; cmd.CommandType = CommandType.Text ; cmd.Parameters.AddWithValue( "@DiscountPromotionalID" , discountPromotionalID ) ; cmd.Parameters.AddWithValue( "@isActive" , isActive ? 1 : 0 ) ; // C# bools are true/false; SQL bools are 1/0 cmd.Parameters.AddWithValue( "@Title" , title ) ; cmd.Parameters.AddWithValue( "@BeginDate" , beginDate ) ; cmd.Parameters.AddWithValue( "@EndDate" , endDate ) ; cmd.Parameters.AddWithValue( "@DiscountPercentage" , discountPercentage ) ; connection.Open() ; rowsAffected = cmd.ExecuteNonQuery() ; connection.Close() ; } return rowsAffected ; } </code></pre>
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1. POConvert DateTime to a different format in sql
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1. USNicholas Carey
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1. USNicholas Carey
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