Solved

selectAndOrderPs.setString(1, visitId)

Posted on 2004-10-15
5
274 Views
Last Modified: 2012-06-21
   
Hi!

Can anybody tell me what selectAndOrderPs.setString(1, visitId) does in detail?
++++++++++++++

private String selectTitlesAndOrder="select test.assess_test_id as id, type.test_type_title as title"+ " FROM Assess_Tests test, Assess_test_types type" +" WHERE visit_id=? AND" + " test.assess_test_type_id=type.assess_test_type_id" + " ORDER BY ?";


public LinkedHashMap selectTitlesAndOrder(String visitId, String orderParam)
       throws SQLException {
            log.debug("start");

            LinkedHashMap testMap = new LinkedHashMap();
            
            selectAndOrderPs = db.prepareStatement(selectTitlesAndOrder);
            selectAndOrderPs.setString(1, visitId);
            selectAndOrderPs.setString(2,orderParam);

            ResultSet rs = selectAndOrderPs.executeQuery();
      
            while(rs.next()) {
                  testMap.put(rs.getString("id"), rs.getString("title"));
            }

            selectAndOrderPs.close();
            
            return testMap;
    }
++++++
thanks,
0
Comment
Question by:dkim18
5 Comments
 
LVL 20

Accepted Solution

by:
Venabili earned 43 total points
ID: 12322528
Hi dkim18,
Sets the value written in visitId at the place of the first ?. It also escapes the value if needed....

Venabili
0
 
LVL 86

Assisted Solution

by:CEHJ
CEHJ earned 41 total points
ID: 12322538
It's a wrapper around a query that parameterizes a query based on its id and sort order. A Map is built such that the test assess id returned by the query is mapped to the titles of the tests
0
 
LVL 21

Assisted Solution

by:MogalManic
MogalManic earned 41 total points
ID: 12323026
The setString(n, str) set the parameter at location n to the string str.  This assumes that the statement has been prepared with parameters and that the ? position is mapped to a string.  If not a SQLException will occur.

In your example the SQL statment has parameters on 'visit_id=?', and 'ORDER BY ?'.  The 1st is valid and is parameter one.  The second will not work.  The reason is that the database uses the parameterized SQL statment and generates its internal Query.  If the statement has been used before, the database may choose to cache the statement compilation and thus make your query faster.  You cannot set the parameter on ORDER BY because the database needs to know how to sort the results BEFORE it is executed.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
ejb wildfly example 2 20
String array comparison 4 38
sql import cannot be resolved jsp 3 45
restrict decimal places for double datatype 10 19
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question