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Tip of the Day
Language: Java
Expertise: Advanced
Nov 10, 2001

Converting ResultSet to XML


Oftentimes, we need to convert ResultSets to XML for transferring data across different applications. Here is very simple code that transforms ResultSets into XML.
 
import java.sql.*;
import java.io.*;

public class XMLWriter
{
    public String generateXML(final ResultSet rs) 
throws SQLException
    {
        final StringBuffer buffer = 
new StringBuffer(1024*4);
        if(rs == null) return "";
        if(!rs.next()) return "";
        buffer.append("<?xml 
version=\"1.0\" encoding=\"UTF-8\"?>\n");
        buffer.append("<ResultSet>\n");
        ResultSetMetaData rsmd = rs.getMetaData();
        int colCount = rsmd.getColumnCount();
        for(int id=0; rs.next(); id++)
        {
            buffer.append("\t<row id=\"")
.append(id).append("\">\n");
            for(int i = 1; i <= colCount; i++)
            {
                int type = rsmd.getColumnType(i);
                buffer.append("\t\t<col name=\"" + 
rsmd.getColumnName(i) +
"\">");
                buffer.append(getValue( rs, i, type));
                buffer.append("</col>\n");
            }
            buffer.append("\t</row>\n");
        }
        buffer.append("</RowSet>");
        rs.close();
        return buffer.toString();
    }

    /**
     * This method gets the value of the specified column
     */
    private String getValue(final ResultSet rs, int colNum, 
int type)
throws SQLException
    {
        switch(type)
        {
            case Types.ARRAY :
            case Types.BLOB :
            case Types.CLOB :
            case Types.DISTINCT :
            case Types.LONGVARBINARY :
            case Types.VARBINARY :
            case Types.BINARY :
            case Types.REF :
            case Types.STRUCT :
                return "undefined";

            default :
            {
                Object value = rs.getObject(colNum);
                if(rs.wasNull() || (value == null))
                    return ("null");
                else
                    return (value.toString());
            }
        }
    }
}
Kesav Kumar
 
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