java code for Typical database commands

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;

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

public class DatabaseServlet extends HttpServlet {

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

String sql = "select * from atable";
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
ResultSetMetaData rsm = null;

response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out
.println("");
out.println("

Database info

");
out.println("");

try {

//load the database driver
Class.forName("oracle.jdbc.driver.OracleDriver");

//The JDBC URL for this Oracle database
String url = "jdbc:oracle:thin:@142.3.169.178:1521:ORCL";

//Create the java.sql.Connection to the database
conn = DriverManager.getConnection(url, "usr", "pass");

//Create a statement for executing some SQL
stmt = conn.createStatement();

rs = stmt.executeQuery(sql);

rsm = rs.getMetaData();

int colCount = rsm.getColumnCount();

//print column names
for (int i = 1; i <= colCount; ++i) {

out.println("");
}

out.println("");

while (rs.next()) {

out.println("");

for (int i = 1; i <= colCount; ++i)
out.println("");

out.println("");

}

} catch (Exception e) {

throw new ServletException(e.getMessage());

} finally {

try {

stmt.close();
conn.close();

} catch (SQLException sqle) {
}

}

out.println("

" + rsm.getColumnName(i) + "
" + rs.getString(i) + "

");

out.println("");
out.println("");

out.close();

} //doGet

}