Adeel's Technology Blog: December 2011

Tuesday, 20 December 2011

Saturday, 17 December 2011

Carousel Item Displaying Image from Blob Column in Oracle ADF Jdeveloper 11g R2

Upload and Display Image from Database Blob Column in Oracle ADF Jdeveloper 11g R2

1- MAKE NEW SERVLET

COPY TEXT FROM BELOW TO NEW SERVLET.

DEFINE IMAGE SOURCE WITH SERVLET NAME AND PARAMETER VALUE.

DISPLAY MAGE SERVLET CODING

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import java.sql.Blob;
import java.sql.Connection;

import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import javax.naming.Context;
import javax.naming.InitialContext;

import javax.servlet.*;
import javax.servlet.http.*;

import javax.sql.DataSource;

public class Servlet1 extends HttpServlet {
    private static final String CONTENT_TYPE = "image/gif; charset=utf-8";

    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }

    public void doGet(HttpServletRequest request,
                      HttpServletResponse response) throws ServletException,
                                                           IOException {


        response.setContentType(CONTENT_TYPE);
        String imageId = request.getParameter("id");
        OutputStream os = response.getOutputStream();
        Connection conn = null;
        try {
            Context ctx = new InitialContext();
            conn = getOracleConnection();
            PreparedStatement statement =
                conn.prepareStatement("SELECT employee_id,pic " +
                                      "FROM employees " +
                                      "WHERE employee_id = ?");
            statement.setInt(1, new Integer(imageId));
            ResultSet rs = statement.executeQuery();

            if (rs.next()) {
                Blob blob = rs.getBlob("PIC");
                BufferedInputStream in = new BufferedInputStream(blob.getBinaryStream());
                int b;
                byte[] buffer = new byte[10240];
                while ((b = in.read(buffer, 0, 10240)) != -1) {
                    os.write(buffer, 0, b);
                }
                os.close();
            }
        } catch (Exception e) {
            System.out.println(e);
        } finally {
            try {
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException sqle) {
                System.out.println("SQLException error");
            }
        }
    }
    public static Connection getOracleConnection() throws Exception {
      String driver = "oracle.jdbc.driver.OracleDriver";
      String url = "jdbc:oracle:thin:@localhost:1521:orcl";
      String username = "hr";
      String password = "hr";

      Class.forName(driver); // load Oracle driver
      Connection conn = DriverManager.getConnection(url, username, password);
      return conn;
    }

}

UPLOAD IMAGE CODING

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import java.sql.SQLException;

import oracle.adf.model.BindingContext;
import oracle.adf.model.binding.DCBindingContainer;
import oracle.adf.model.binding.DCIteratorBinding;

import oracle.binding.BindingContainer;

import oracle.jbo.Row;
import oracle.jbo.domain.BlobDomain;

import org.apache.myfaces.trinidad.model.UploadedFile;

public class UploadBean {
    public UploadBean() {
        super();
    }

    private UploadedFile _file;

    public UploadedFile getFile() {
        return _file;
    }

    public void setFile(UploadedFile file) {
        _file = file;
    }

    public String uploadImage() {

        UploadedFile myfile = (UploadedFile)this.getFile();

        BindingContext bindingctx = BindingContext.getCurrent();
        BindingContainer bindings = bindingctx.getCurrentBindingsEntry();
        DCBindingContainer bindingsImpl = (DCBindingContainer)bindings;
        DCIteratorBinding iter = bindingsImpl.findIteratorBinding("ABCView1Iterator");

        Row row = iter.getCurrentRow();
        row.setAttribute("Pic", createBlobDomain(myfile));

     return null;
    }

    private BlobDomain createBlobDomain(UploadedFile file) {

        InputStream in = null;
        BlobDomain blobDomain = null;
        OutputStream out = null;

        try {
            in = file.getInputStream();

            blobDomain = new BlobDomain();
            out = blobDomain.getBinaryOutputStream();
            byte[] buffer = new byte[8192];
            int bytesRead = 0;

            while ((bytesRead = in.read(buffer, 0, 8192)) != -1) {
                out.write(buffer, 0, bytesRead);
            }

            in.close();

        } catch (IOException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.fillInStackTrace();
        }

        return blobDomain;
    }

}

Friday, 16 December 2011

Some Usefull Sql Queries

To separate number from text (SELECT ltrim('6372Tech', '0123456789') FROM DUAL; )
Translate character to 'x' (SELECT translate('1tech23', '0123456789', 'xxxxxxxxx') FROM DUAL;)
null if value = 10 (SELECT NULLIF(10,10) FROM DUAL;)
select supplier_id,
CASE
WHEN supplier_name = 'IBM' and supplier_type = 'Hardware' THEN 'North office'
WHEN supplier_name = 'IBM' and supplier_type = 'Software' THEN 'South office'
END
from suppliers;
Find date of next month 1st TUESDAY (select next_day(trunc(add_months(sysdate,1),'MM'),'TUESDAY') from dual)
SELECT 2 month, SUM(amount) AS month_amount, 3 SUM(SUM(amount)) OVER 4 (ORDER BY month ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) 5 AS cumulative_amount 6 FROM all_sales 7 GROUP BY month 8 ORDER BY month; MONTH MONTH_AMOUNT CUMULATIVE_AMOUNT ---------- ------------ ----------------- 1 58704.52 58704.52 2 28289.3 86993.82 3 20167.83 107161.65 4 50082.9 157244.55 5 17212.66 174457.21 6 31128.92 205586.13 7 78299.47 283885.6 8 42869.64 326755.24 9 35299.22 362054.46 10 43028.38 405082.84 11 26053.46 431136.3 12 20067.28 451203.58 12 rows selected.