Source Code : Delete Clob From Oracle in a Servlet

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Delete Clob From Oracle in a Servlet

/*
Defining the Table: Oracle 9i

The following defines a table based on Oracle 9i:

create table DataFiles (
    id INT PRIMARY KEY,
    fileName VARCHAR(20),
    fileBody CLOB
);

Defining the Table: MySQL

The following defines a table based on MySQL:

create table DataFiles (
    id INT PRIMARY KEY,
    fileName VARCHAR(20),
    fileBody TEXT
);

*/
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DeleteClobFromOracleServlet extends HttpServlet {

  public static Connection getConnection() throws Exception {
    String driver = "oracle.jdbc.driver.OracleDriver";
    String url = "jdbc:oracle:thin:@localhost:1521:databaseName";
    String username = "userName";
    String password = "password";
    Class.forName(driver);
    Connection conn = DriverManager.getConnection(url, username, password);
    return conn;
  }

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

    Connection conn = null;
    PreparedStatement pstmt = null;
    String id = "001";
    ServletOutputStream out = response.getOutputStream();
    response.setContentType("text/html");
    out.println("<html><head><title>Delete CLOB Record</title></head>");

    try {
      conn = getConnection();
      pstmt = conn.prepareStatement("delete from DataFiles where id = ?");
      pstmt.setString(1, id);
      pstmt.executeUpdate();
      out.println("<body><h4>deleted CLOB record with id=" + id + "</h4></body></html>");
    } catch (Exception e) {
      out.println("<body><h4>Error=" + e.getMessage() + "</h4></body></html>");
    } finally {
      try {
        pstmt.close();
        conn.close();
      } catch (SQLException e) {
        e.printStackTrace();
      }
    }
  }

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

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