Typical database commands : Database « Servlets « Java

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Java » Servlets » DatabaseScreenshots 
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("<html><head><title>Typical Database Access</title></head><body>");
    out.println("<h2>Database info</h2>");
    out.println("<table border='1'><tr>");

    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("<th>" + rsm.getColumnName(i"</th>");
      }

      out.println("</tr>");

      while (rs.next()) {

        out.println("<tr>");

        for (int i = 1; i <= colCount; ++i)
          out.println("<td>" + rs.getString(i"</td>");

        out.println("</tr>");

      }

    catch (Exception e) {

      throw new ServletException(e.getMessage());

    finally {

      try {

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

      catch (SQLException sqle) {
      }

    }

    out.println("</table><br><br>");

    out.println("</body>");
    out.println("</html>");

    out.close();

  //doGet

}



           
       
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6. JDBC and Servlet
7. Database and Servlet: Database MetaData
8. Database and Servlet: Store procedure
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10. Process a raw SQL query; use ResultSetMetaData to format it
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15. OCCI Connection Servlet
16. Get Column Names From ResultSet
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19. Delete Clob From Servlet
20. Display Blob Servlet
21. Delete Clob From Oracle in a Servlet
22. Insert Clob to MySql Servlet
23. Update Clob data stored in MySql from a Servlet
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