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Tuesday, January 29, 2013

Using Case in a SQL Query

Using Case in Update Statement
UPDATE dbo.Customer SET stateDescription CASE WHEN statecode 'MA' THEN 'Massachusetts' WHEN statecode 'VA' THEN 'Virginia' WHEN statecode 'PA' THEN 'Pennsylvania' ELSE NULL END
 
Using Case in Select Statement
SELECT COUNT(*) AS TotalCustomers
SUM(CASE WHEN statecode 'MA' THEN ELSE NULL ENDAS TotalMassCustomers
AVG(CASE WHEN statecode 'MA' THEN totalsales ELSE NULL ENDAS TotalMassSales 
FROM dbo.Customer 

Using Case in Stored Procedure
CREATE PROCEDURE dbo.getCustomerData @sortby VARCHAR(9), @sortdirection CHAR(4) AS
SET 
nocount ON

SELECT 
customeridfirstnamelastnamestatecodestatedescriptiontotalsales FROM dbo.Customer ORDER BY  CASE @sortdirection
     
WHEN 'asc' THEN
      
CASE @sortby 
       
WHEN 'firstname' THEN firstname 
       
WHEN 'lastname' THEN lastname 
       
END
END 
ASC
, CASE @sortdirection
      
WHEN 'desc' THEN
       
CASE @sortby 
       
WHEN 'firstname' THEN firstname 
       
WHEN 'lastname' THEN lastname 
       
END
END
DESC
GO EXEC dbo.getCustomerData 'lastname''desc' 

Monday, January 21, 2013

Generating BarCode Using C-Sharp

Following are the methods to generate the barcode using C-Sharp...



private void btn_GenerateBarCode_Click(object sender, EventArgs e)
{
     GenerateBarCode();
}





private void GenerateBarCode()
{
    int barSize = System.Convert.ToInt32(39);
System.Byte[] imgBarcode = Code39("*" + txtBarCodeText.Text + "*", barSize, false, "");
    MemoryStream memStream = new MemoryStream(imgBarcode);
    PictureBox_BarCodeResult.Image = new Bitmap(memStream);
    //statbar.Panels[0].Text = "Done.";
    this.Cursor = Cursors.Default;
}


// This Method is used in above method
public byte[] Code39(string code, int barSize, bool showCodeString, string title)
{
    MyBarCodeClass c39 = new MyBarCodeClass();
    string appPath = Path.GetDirectoryName(Application.ExecutablePath);

    // Create stream....
    MemoryStream ms = new MemoryStream();
    c39.FontFamilyName = "Free 3 of 9";
    c39.FontFileName = appPath + "\\FREE3OF9.TTF";
    c39.FontSize = barSize;
    c39.ShowCodeString = showCodeString;
    if (title + "" != "")
        c39.Title = title;
    Bitmap objBitmap = c39.GenerateBarcode(code);
    objBitmap.Save(ms, ImageFormat.Png);

    //return bytes....
    return ms.GetBuffer();
}
 
Bellow is the Class used in above Method



public class MyBarCodeClass
{
private const int _itemSepHeight = 3;

SizeF _titleSize = SizeF.Empty;
SizeF _barCodeSize = SizeF.Empty;
SizeF _codeStringSize = SizeF.Empty;

#region Barcode Title

private string _titleString = null;
private Font _titleFont = null;

public string Title
{
    get { return _titleString; }
    set { _titleString = value; }
}

public Font TitleFont
{
    get { return _titleFont; }
    set { _titleFont = value; }
}
#endregion

#region Barcode code string

private bool _showCodeString = false;
private Font _codeStringFont = null;

public bool ShowCodeString
{
    get { return _showCodeString; }
    set { _showCodeString = value; }
}

public Font CodeStringFont
{
    get { return _codeStringFont; }
    set { _codeStringFont = value; }
}
#endregion

#region Barcode Font

private Font _c39Font = null;
private float _c39FontSize = 12;
private string _c39FontFileName = null;
private string _c39FontFamilyName = null;

public string FontFileName
{
    get { return _c39FontFileName; }
    set { _c39FontFileName = value; }
}

public string FontFamilyName
{
    get { return _c39FontFamilyName; }
    set { _c39FontFamilyName = value; }
}

public float FontSize
{
    get { return _c39FontSize; }
    set { _c39FontSize = value; }
}

private Font Code39Font
{
    get
    {
        if (_c39Font == null)
        {
            // Load the barcode font                 
            PrivateFontCollection pfc = new PrivateFontCollection();
            pfc.AddFontFile(_c39FontFileName);
            FontFamily family = new FontFamily(_c39FontFamilyName, pfc);
            _c39Font = new Font(family, _c39FontSize);
        }
        return _c39Font;
    }
}

#endregion

public MyBarCodeClass()
{
    _titleFont = new Font("Arial", 10);
    _codeStringFont = new Font("Arial", 10);
}

#region Barcode Generation

public Bitmap GenerateBarcode(string barCode)
{

    int bcodeWidth = 0;
    int bcodeHeight = 0;

    // Get the image container...
    Bitmap bcodeBitmap = CreateImageContainer(barCode, ref bcodeWidth, ref bcodeHeight);
    Graphics objGraphics = Graphics.FromImage(bcodeBitmap);

    // Fill the background               
    objGraphics.FillRectangle(new SolidBrush(Color.White), new Rectangle(0, 0, bcodeWidth, bcodeHeight));

    int vpos = 0;

    // Draw the title string
    if (_titleString != null)
    {
        objGraphics.DrawString(_titleString, _titleFont, new SolidBrush(Color.Black), XCentered((int)_titleSize.Width, bcodeWidth), vpos);
        vpos += (((int)_titleSize.Height) + _itemSepHeight);
    }
    // Draw the barcode
    objGraphics.DrawString(barCode, Code39Font, new SolidBrush(Color.Black), XCentered((int)_barCodeSize.Width, bcodeWidth), vpos);

    // Draw the barcode string
    if (_showCodeString)
    {
        vpos += (((int)_barCodeSize.Height));
        objGraphics.DrawString(barCode, _codeStringFont, new SolidBrush(Color.Black), XCentered((int)_codeStringSize.Width, bcodeWidth), vpos);
    }

    // return the image...                                                   
    return bcodeBitmap;
}

private Bitmap CreateImageContainer(string barCode, ref int bcodeWidth, ref int bcodeHeight)
{

    Graphics objGraphics;

    // Create a temporary bitmap...
    Bitmap tmpBitmap = new Bitmap(1, 1, PixelFormat.Format32bppArgb);
    objGraphics = Graphics.FromImage(tmpBitmap);

    // calculate size of the barcode items...
    if (_titleString != null)
    {
        _titleSize = objGraphics.MeasureString(_titleString, _titleFont);
        bcodeWidth = (int)_titleSize.Width;
        bcodeHeight = (int)_titleSize.Height + _itemSepHeight;
    }

    _barCodeSize = objGraphics.MeasureString(barCode, Code39Font);
    bcodeWidth = Max(bcodeWidth, (int)_barCodeSize.Width);
    bcodeHeight += (int)_barCodeSize.Height;

    if (_showCodeString)
    {
        _codeStringSize = objGraphics.MeasureString(barCode, _codeStringFont);
        bcodeWidth = Max(bcodeWidth, (int)_codeStringSize.Width);
        bcodeHeight += (_itemSepHeight + (int)_codeStringSize.Height);
    }

    // dispose temporary objects...
    objGraphics.Dispose();
    tmpBitmap.Dispose();

    return (new Bitmap(bcodeWidth, bcodeHeight, PixelFormat.Format32bppArgb));
}

#endregion


#region Auxiliary Methods

private int Max(int v1, int v2)
{
    return (v1 > v2 ? v1 : v2);
}

private int XCentered(int localWidth, int globalWidth)
{
    return ((globalWidth - localWidth) / 2);
}

#endregion

}


 
 

Sample text

Sample Text