Databases
StackOverflow2013
Postsdbo
POhow to get the result query one by one in jsp and mysql
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POhow to get the result query one by one in jsp and mysql
    primarykey
    data
    text
    <p>I am trying to implement as Online Mock exam in JSP, but I have a problem to get the questions one by one, it get connceted for the first time, and show me the first question and answers, but when I click on "next" again, it still show me the first question, I think by clicking on "next" it start querying again. please help me. this is my bean :</p> <pre><code>database.SQLSelectStatement sqlselect; database.SQLSelectStatement sqlselect2; static ResultSet questions; static ResultSetMetaData rsm; static ResultSet answers; public void setConnection() throws SQLException { if (database.DatabaseManager.getInstance().connectionOK()) { sqlselect = new database.SQLSelectStatement("question", "question", "0"); sqlselect2 = new database.SQLSelectStatement("answers", "question_id", "0"); questions = sqlselect.executeWithNoCondition(); } } public int i=0; public String getQuestions() throws SQLException { String result = ""; rsm = questions.getMetaData(); for (int i = 0; i &lt; rsm.getColumnCount(); i++) { result += "&lt;th&gt;" + rsm.getColumnName(i + 1) + "&lt;/th&gt;"; } if (!questions.isLast()) { questions.next(); System.out.println(i+1); result += "&lt;tr&gt;"; result += "&lt;td&gt;" + questions.getInt(1) + "&lt;/td&gt;"; result += "&lt;td&gt;" + questions.getString(2) + "&lt;/td&gt;"; result += "&lt;/tr&gt;"; result += "&lt;tr&gt;"; sqlselect2.setValue(String.valueOf(questions.getInt(1))); answers = sqlselect2.Execute(); while (answers.next()) { result += "&lt;tr&gt; &lt;td colspan='2'&gt;&lt;input type='radio' name='answer' value='" + answers.getString(2) + "'&gt; " + answers.getString(2) + "&lt;/td&gt;&lt;/tr&gt;"; } result += "&lt;/tr&gt;"; answers.close(); } return result; } </code></pre> <p>this is the HTML:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;JSP Page&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;h1&gt;JSP Page&lt;/h1&gt; &lt;jsp:useBean id="exam" class="exam.ExamQuestions"&gt;&lt;/jsp:useBean&gt; &lt;% exam.setConnection(); %&gt; &lt;form method="post"&gt; &lt;table &gt; &lt;%=exam.getQuestions()%&gt; &lt;/table&gt; &lt;input type="submit" name="action" value="next"/&gt; &lt;/form&gt; &lt;% String action = request.getParameter("action"); if ("next".equals(action)) { out.println(request.getParameter("answer")); } %&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USBalusC
    1. USuser261002
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload