Question

i´m trying to update rows in mysql table, i´m using html form for data insertion. In html form attribute value i´m using an existing data from database.

Edit.jsp

<form action="Update.jsp">
                <%  Class.forName("com.mysql.jdbc.Driver").newInstance();
                    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
                    Statement st = con.createStatement();
                    ResultSet rs = st.executeQuery("select u.login,i.name,i.surname,i.age,i.tel,i.email,a.street,a.town,a.zip,ul.name,t.name from users u join info i on i.user_id=u.user_id join user_level ul on ul.ulevel=u.ulevel join teams t on t.team_id=u.team_id join adress a on a.info_id=i.info_id where u.login='" + session.getAttribute("uzivatel") + "'");
                    while (rs.next()) {
                %>

                <div class="well well-large">
                    <font size="2"><b>Welcome, </b></font><font color="RED"><i><%= session.getAttribute("uzivatel")%></i></font><br>
                    <b>Name:</b> <input type="text" name="name" value="<%= rs.getString(2)%>"><input type="text" name="surname" value="<%= rs.getString(3)%>"> <br>
                    <b>Age:</b> <input type="text" name="age" value="<%= rs.getString(4)%>"><br>
                    <b>Telephone:</b> <input type="text" name="tel" value="0<%= rs.getString(5)%>"><br>
                    <b>E-mail:</b> <input type="text" name="email" value="<%= rs.getString(6)%>"><br>
                    <b>Adress:</b> <input type="text" name="street" value="<%= rs.getString(7)%>"><input type="text" name="town" value="<%= rs.getString(8)%>"><input type="text" name="zip" value="<%= rs.getString(9)%>"><br>
                    <b>User level:</b> <%= rs.getString(10)%><br>
                    <b>Team:</b> <%= rs.getString(11)%><br>
                    <input type="submit" name="Submit" value="Update" />
                </div>
            </form>

Update.jsp

<%
                String name = request.getParameter("name");
                String surname = request.getParameter("surname");
                String age = request.getParameter("age");
                String telephone = request.getParameter("tel");
                String email = request.getParameter("email");
                String street = request.getParameter("street");
                String town = request.getParameter("town");
                String zip = request.getParameter("zip");

                try {
                    Connection conn = null;
                    Class.forName("com.mysql.jdbc.Driver").newInstance();
                    conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
                    Statement st1 = null;
                    st1 = conn.createStatement();
                    System.out.println(session.getAttribute("uzivatel"));
                    st1.executeUpdate("UPDATE users JOIN info ON users.user_id = info.user_id"
                            + " JOIN adress ON info.info_id = adress.info_id"
                            + "SET info.name = '"+name+"',info.surname = '"+surname+"',"
                            + "info.age = '"+age+"',info.tel = '"+telephone+"',info.email = '"+email+"',"
                            + "adress.street = '"+street+"',adress.town = '"+town+"',adress.zip = '"+zip+"',"
                            + "WHERE users.login ='" + session.getAttribute("uzivatel") + "'  ");
                    response.sendRedirect("AdministrationControlPanel.jsp");
                } catch (Exception e) {
                    System.out.println(e.getMessage());
                }
            %>

When I pressed the Submit button, it redirected me to Update.jsp and nothing was changed.

Answer 1

There is problem in your query that is why you are not getting any result. give space at properly when you are dividing the string in various lines.
system.out.println() will show message on the console not on the page

st1.executeUpdate("UPDATE users JOIN info ON users.user_id = info.user_id"
                        + " JOIN adress ON info.info_id = adress.info_id "
                        + "SET info.name = '"+name+"',info.surname = '"+surname+"', "
                        + "info.age = '"+age+"', info.tel = '"+telephone+"', info.email = '"+email+"',"
                        + "adress.street = '"+street+"',adress.town = '"+town+"',adress.zip = '"+zip+"', "
                        + "WHERE users.login ='" + session.getAttribute("uzivatel") + "'  ");