Query about inserting records in queue

Background:
I am about to develop a seat booking system for a cinema ... To prevent inserting a record when a person books a seat, I'll generate a set of seat records in advance, and an operator will be responsible for booking seats for customers through my application with web interface, and, as a backend process, the system will UPDATE the seat availability by changing a flag in my table field.
Question:
To handle the situation, I may implement a servlet in 'SingleThreadModel' to make the booking prcess behaves in a first-in first-out manner, but the performance may be decreased. Can the BC4J model help me so that I could only allow one thread for the update process (i mean the seat availability updating) with a better performance framework construction? If possible, would you please also illustrate with sample code so that i can follow?
Thanks for any replies!

Hi,
I agree with you that synchronizing the servlet access is not the optimal way to solve this problem. Dealing with
row-level consistency is a typical issue for transactional applications. BC4J solves this problem by performing
consistency checks before performing any DML. Consider the following scenario:
Assume optimistic locking (i.e. row-level locks are not acquired when the update is made.
Fairly typical for web applications).
at t0 seat 1 is available
at t1 user1 updates seat 1 as unavailable
at t2 user2 updates seat 1 as unavailable
at t3 user1 commits the transaction
at t4 user2 attempts to commit the transation
Now what should happen? As you have indicated above the application must prevent user2 from re-booking seat 1.
Basically, BC4J does this by performing a consistency check before posting data to the database. If the database values
at the time of post (and lock in the optimistic case) are not equal to the original database values then BC4J will throw a
RowInconsistentException and not allow the transaction to complete.
So, BC4J is already performing most of the work for you. As an application developer you have the choice of how to
handle a RowInconsistentException or an AlreadyLockedException (may occur if user1 holds a lock on seat1 when
user2 attempts to commit). For example, you may want to refresh the page with the updated record. This would
give your operator an opportunity to select another available seat.
Hope this helps.
JR

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hello ,
i want to insert record in table abc which have 3 column
i want to insert 2 values from xyz table and one values is from variable
i write following query
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EXECUTE IMMEDIATE vMYQUERY;
is it correct ?
pankaj

Did it work?
You could try the USING clause;
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Table created.
SQL> create table xyz(NO number, TYPE varchar2(10), SUB_TRAN varchar2(10))
Table created.
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PL/SQL executed.
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PL/SQL procedure successfully completed.
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Query about multi record block

Abdetu
Please clarify this
I have a multi record group on the canvas, which displays 5 records at a time. The block is based on a table. All the items, except 3 items are displayed items.Now in the block I have a list item, in which I have two values "PO" and "TSF".. If user selects PO, associated text items will get enabled and user will be entering the values .. Same is the case with TSF .. And at the end user selects Ok button to save the record to the database
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Message was edited by:
Seshu
Message was edited by:
Seshu

Hello Seshu
ur case explanation should be in points 1,2,etc as possible leaving extra lines and spaces in between .. and the case should be more clear and summarized like:
1- I have multi-records data block.
2- I have a static list item with 2 values eg. (a and b).
3- Depending on selecting from the list some items r enabled.etc.
Kindly note that, this will facilitate ur problem to be more readable,recognizable and save time and effort of someone who wants to help u.
Here comes the confusion:
Now while fetching the records (based on query)
The problem what I am facing is, when the control comes to PO/TSF list box.. >since its multi record block, all the record's PO/TSF list box are getting enabled i think with the piece of code i have just posted to u this can't be happened since it disable all the record's PO/TSF.
if this didn't solve ur problem i suggest either u post ur code to help u or u try to put some validations with :
if statment inside the loop depending on the list item's values which will enable or disable related items to the list.
Hope this help u,
If any Questions pls let me know..
Regards,
Abdetu..

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Hi all,
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Hello,
working on the same issue:
Try this:
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Sql Query to store record like warehoue wise items

Hi Experts
I want to ask you a sql query for inserting records from two table OITM and OWHS in a user definded table like OITW.
I have a table BINMASTER in which bin code are stored. Now I want to create a table Like OWHS where BIN Wise Item records to be stored Let See
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Item02 Bin 01
Item03 Bin 01
Item01 Bin 02
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hi János Nagy
Thank for reply
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URGENT Select Query Returning No Records take same time as that of insert

Hello Everrybody,
I am facing a wierd problem...
I have table with 15 fields and I am selecting a record with some condition...
for e.g
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Now I have index on field1
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and using
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8i measures timings in 100th of a second but I believe that 9i measures stuff in 1000th of a second. However, from your output it looks like SQL*Plus trace is rounding up to the nearest centisecond.
Time is a very poor way of judging performance when you're talking less than a second per operation. You'd be better off looking at CPU usage and IO activity.
Anyway, here are some questions for you to research:
(1) Is field1 a unique index?
(2) How many rows does this table hold?
(3) How fresh are the statistics on the table and the index?
(4) What's the explain plan? What's the TKPROF output?
(5) Are all of the above the same on both databases?
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New issue in R 12.1.3 in AP while query about inovice was recorded in AP

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I have Query Based VO (Not belongs to any EO).
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No.

SQL Query for insertion

hi
I got two tables
BOOK (DDC,TITLE,ISBN,AUTH_NAME)
AUTHOR (DDC,AUTH_NAME)
Table "BOOK" contains about 50000 records but its
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I want insert AUTH_NAME column's values from AUTHOR table
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thanks

hi,
AUTH_NAME column contains NULL for all 50000 records.
I want insert AUTH_NAME column's values from AUTHOR table
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And what are you updating as it contains no data(i.e null value)
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Experienced DW designer learning CFMX7. I cannot seem to get
beyond this error message when using the Insert Record server
behavior to write data from a form into the database. Using MS
Access 2002, CFMX7's internal server, DW 6.0. Please note that I am
learning development for the first time and am using tutorials. I
was able to connect at one point but now I cannot.
See error message below:
The following information is meant for the website developer
for debugging purposes.
Error Occurred While Processing Request
Error Executing Database Query.
Syntax error in INSERT INTO statement.
Resources:
Enable Robust Exception Information to provide greater detail
about the source of errors. In the Administrator, click Debugging
& Logging > Debugging Settings, and select the Robust
Exception Information option.
Check the ColdFusion documentation to verify that you are
using the correct syntax.
Search the Knowledge Base to find a solution to your problem.
Browser Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;
SV1; .NET CLR 1.1.4322)
Remote Address 127.0.0.1
Referrer
http://localhost:8500/moosek/TMPu724j3nl2j.cfm
Date/Time 07-Aug-06 07:23 PM
Text
Text

MongoSlade,
I had this exact same problem with a CFMX 7 datasource that
was set up as Microsoft Access with Unicode. It turns out that
"Password" is a reserved word in the Unicode driver. Or somewhere.
I got around it by putting square brackets, i.e., [ ] around the
column name, like this:
update MyTable
set [Password] = '#form.Password#'
where UserID = '#form.UserID#'
That solved the problem nicely. I hope this solution will
work for you as well.

Problem inserting record using INSERT INTO

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Syntax error in INSERT INTO statement.
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Below is the entire page with line 22 (referenced in the error message) in red. Any ideas?
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link href="main.css" rel="stylesheet" type="text/css" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>Everett Music Department, Everett, MA</title>

<style type="text/css">

</style>
<script src="SpryAssets/SpryMenuBar.js" type="text/javascript"></script>
<script type="text/javascript">

</script>

<script src="SpryAssets/SpryValidationTextField.js" type="text/javascript"></script>
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</tr>
</table>
<table width="960" cellpadding="0" cellspacing="0" align="center">
<tr height="50">
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                <td class="form" align="right">Password:</td>
                <td><span id="sprytextfield5">
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              </tr>
              <tr>
                <td class="form" align="right">Confirm Password:</td>
                <td><span id="sprytextfield6"><span id="ConfirmWidget">
                  <input type="password" name="password_confirm" required="yes" id="password_confirm" width="150" />
                  <span class="confirmInvalidMsg">The values do not match</span></span></span></td>
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              <tr>
                <td> </td>
                <td><input name="submit" type="submit" id="submit" value="Register" /></td>
              </tr>
            </table>
      <input type="hidden" name="MM_InsertRecord" value="register" />
      </form>
      <script type="text/javascript">

</script>
<script type="text/javascript">
var ConfirmWidgetObject = new Spry.Widget.ValidationConfirm("sprytextfield4", "email");
var ConfirmWidgetObject = new Spry.Widget.ValidationConfirm("sprytextfield6", "password");
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          </td>
        </tr>
      </table>
    </td>
    <td width="30" background="right_border.jpg"><img src="clear.gif" width="30" height="50" /></td>
</tr>
<tr>
    <td colspan="3" background="footer.jpg" class="footer" height="80"/>This website best viewed using:<br /><a href="http://www.firefox.com"><img src="firefox_logo.gif" width="110" height="40" border="0" /></a></td>
</tr>
</table>
<script type="text/javascript">

</script>
</body>
</html>

Syntax error in INSERT INTO statement. INSERT INTO Users ([First Name], [Last Name], [Email Address], Password)
That oh-so-uninformative error is because "Password" is a reserved word with your database driver. Either escape it by putting square brackets around it too, or rename the column permanently. It is best to avoid using reserved words whenever possible. So renaming the column is the better option. Also, I would try and avoid using invalid characters like spaces in column names ie "First Name". It is technically allowed, but it requires special handling everywhere which adds unecessary complexity.
I'm not sure what the problem is, but I'm getting a syntax error referencing this particular portion of the code:
Do not take the error line numbers as gospel. Sometimes they just indicate that the error is within the vincinty of that line.
I'm using Dreamweaver CS3 to help generate most of the code
Unforutnately, DW wizards generate some truly awful and verbose code. To give you an idea, here is what the query should look like, without all the wizard nonsense.
<cfparam name="FORM.first_name" default="">
<cfparam name="FORM.last_name" default="">
<cfparam name="FORM.email" default="">
<cfparam name="FORM.FORM.password" default="">
<cfquery datasource="YourDSNName">
    INSERT INTO Users ([First Name], [Last Name], [Email Address], [Password])
    VALUES (
      <cfqueryparam value="#FORM.first_name#" cfsqltype="cf_sql_varchar">
     , <cfqueryparam value="#FORM.last_name#" cfsqltype="cf_sql_varchar">
     , <cfqueryparam value="#FORM.email#" cfsqltype="cf_sql_varchar">
     , <cfqueryparam value="#FORM.password#" cfsqltype="cf_sql_varchar">
</cfquery>
CF is pretty easy to learn. You might want to begin perusing the CF documentation and a few tutorials to get more familiar with the language. Since you are working with a database, I would also recommend a SQL tutorial.

Insert Record Problems

I am trying to create an insert record instance, but even
though my database connection is ok and I have simplified my form
down to one entry, I cannot get the query to work. The lastest
error I am getting is:
The field 'ARTISTS.LASTNAME' cannot contain a Null value
because the Required property for this field is set to True. Enter
a value in this field.
Where am I going wrong? Can someone help out a beginner about
to lose their mind?

I tried making a new table in the database with only one
field and an automatically generated primary key, but am now
getting the following error:
Error Executing Database Query.
Cannot start your application. The workgroup information file
is missing or opened exclusively by another user.
The error occurred in
D:\CFusionMX7\wwwroot\Synopsispost\firstnameform.cfm: line 15
13 : <cfelse>
14 : NULL
15 : </cfif>
16 : )
17 : </cfquery>
My complete coding is:
<cfset CurrentPage=GetFileFromPath(GetTemplatePath())>
<cfif IsDefined("FORM.MM_InsertRecord") AND
FORM.MM_InsertRecord EQ "form1">
<cfquery datasource="submissionsdb" username="cfsimmo"
password="cfsimmo76">
INSERT INTO Mailing List ("Mailing ListID", FirstName)
VALUES (
<cfif IsDefined("FORM.Mailing_ListID") AND
#FORM.Mailing_ListID# NEQ "">
#FORM.Mailing_ListID#
<cfelse>
NULL
</cfif>
<cfif IsDefined("FORM.FirstName") AND #FORM.FirstName#
NEQ "">
'#FORM.FirstName#'
<cfelse>
NULL
</cfif>
</cfquery>
</cfif>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1" />
<title>Untitled Document</title>
</head>
<body>
<form method="post" name="form1"
action="<cfoutput>#CurrentPage#</cfoutput>">
<table align="center">
<tr valign="baseline">
<td nowrap align="right">Mailing ListID:</td>
<td><input type="text" name="Mailing_ListID"
value="" size="32"></td>
</tr>
<tr valign="baseline">
<td nowrap align="right">FirstName:</td>
<td><input type="text" name="FirstName" value=""
size="32"></td>
</tr>
<tr valign="baseline">
<td nowrap align="right"> </td>
<td><input type="submit" value="Insert
record"></td>
</tr>
</table>
<input type="hidden" name="MM_InsertRecord"
value="form1">
</form>
<p> </p>
</body>
</html>
Any ideas?

Updating detail record and getting multiple 'UNABLE TO INSERT RECORD' msgs

Help! We have 2 datablocks, master and detail block with relation defined. Master is defined with view based on database joins; detail is view based on table.
When I update the record in detail block, error message 'UNABLE TO INSERT RECORD' appears four times, then I get transaction complete: 5 records applied and saved, where the one record successfully updates. Why are we getting four records with insert errors and one record update? We don't want to work directly on the table, but why can't we use the view? please help.

The UNABLE TO INSERT record will be accompanied by more information if you press the Display Error key. Your form commit processing should stop when it gets an error like this, the fact that it doesn't implies that somewhere in your code you are not checking for FORM_SUCCESS before continuing doing something else.
This sounds quite involved, we would need to have more information about what records are queried and what's being changed on them to cause the commit.

Error while inserting records in sqlLite database

Hi all
I am building a hybrid web app in SMP using phonegap and html.
I am trying to insert records in sql database but i get an error with an undefined error code
Please see below :
function openDatabaseFoo() {
db = window.openDatabase(clientDBName, clientDBVersion, clientDBDisplayName, clientDBMaxSize);
function createDBTables() {
db.transaction(function(tx) {
// Create mine table
var fooCreate = 'CREATE TABLE IF NOT EXISTS ' + fooTable+ ' (empNo, empName)';
tx.executeSql(fooCreate , [],
function (tx, resultSet) {
            //success
var msg = 'Sucessfully created';
alert(msg);
logSuccessMessage(msg);
            function (err) {
            //error code
            var msg = "Error creating table = " + err.code;
            alert(msg);
            logErrorMessage(msg);
the creation of tables is happening properly because i am getting a success message in the alerts.
I am getting the error when i am trying to insert records in the above table
function insertDataTable(){
db.transaction(function(tx) {
var insertSql = 'INSERT INTO ' + fooTable + ' (empNo, empName) VALUES ("1603","baker")';
tx.executeSql(insertSql, [],
function (tx, resultSet) {
            //success
var msg = 'Sucessful insertingdata.';
alert(msg);
logSuccessMessage(msg);
            function (err) {
            //error code
            var msg = "Error inserting data sql = " + insertSql + " Error code = " + err.code;
            alert(msg);
            logErrorMessage(msg);
can some one please help.Also guide me where can i check the sqlLite database logs to see more about the error.
I would really appreciate the help.I have been onto this since past few days now
Regards
Shweta

What is err.code, or the value of msg when the error occurs?
Thanks,
Andrew.

XSQL error when trying to insert record

hi,
I encounter a problem using INSERT statement in xsql:query action. If I try to use INSERT statement in my xsql page like this:
<xsql:ze_action bean="TaskentryIn">
<xsql:query>
INSERT
Grundtab( Datum,Startzeit,Endzeit)
VALUES
('{@date}',{'@begin}','{@ende}')
</xsql:query>
</xsql:ze_action>
I always get this xsql-error:
Statement.executeQuery - No result sets were produced by 'INSERT...'
So far so good, I think this shouldn't be an error rather a warning.
But this is not my primary problem.
Anyway the record is inserted in the DB. But since I call the above <xsql:query>, from within my own action handler, I call a sendRedirect() to my next page after the <xsql:query> tag was processed.
After sendRedirect(), when I am on my next page, I check the DB for the inserted records, and it shows up that the insert was made two times, so I have two identically records in my DB.
If I am not sendRedirect() to the next xsql page, then the insert is only made once. So I assume that there is a problem if an xsql-error occurs and afterwards a sendRedirect().
I am using the same way to make my SELECT statements and I dont have any trouble with them. Only when I use INSERT.
Any adive or help is appreciated.
Peter

<xsql:query> is only for queries.
Use <xsql:dml> for a DML statement.

Query about inserting records in queue

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