Help plz regarding array and DB

hi ,
i have a problem regarding sorting.
I have 1 million records in my DB table.
When i open my swing application i sort the records in table [ORDER BY col1,col3,col4] like that and want that order record ids .
upto here no problem.i am getting the ids in array and in my swing application when i go next i get from arrray the next record.
but the problem is since the volume of the table is large if any addition r deletion to the table is not reflecting in the sorted order array.
i can simply again call the database and sort it an update the error.but it proved very insufficent way.
so i am looking something to optmise the sorting.
i got an idea like using view .but i am looking anybody knows any workaround alogrithm for this.
sree

Here is an example taken from the ResultSet API Doc's. Note the constant type of "TYPE_SCROLL_SENSITIVE" for the type of ResultSet. Is this what you are using? (I have not tried this, but it is the solution that is put forth in my books and documents.)
       Statement stmt = con.createStatement(
                                      ResultSet.TYPE_SCROLL_SENSITIVE,
                                      ResultSet.CONCUR_UPDATABLE);
       ResultSet rs = stmt.executeQuery("SELECT a, b FROM TABLE2");
       // rs will be scrollable, will not show changes made by others,
       // and will be updatable

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Newbie - help needed with array and dictionary objects

Hi all
Please see the code below. I've posted this code in another thread however the original issue was resolved and this is now a new issue I'm having although centered around the same code.
The issue is that I'm populating an array with dictionary objects. each dictionary object has a key and it's value is another array of custom objects.
I've found that the code runs without error and I end up with my array as I'm expecting however all of the dictionary objects are the same.
I assume it's something to do with pointers and/or re-using the same objects but i'm new to obj-c and pointers so i am a bit lost.
Any help again is very much appreciated.
// Open the database connection and retrieve minimal information for all objects.
- (void)initializeDatabase {
NSMutableArray *authorArray = [[NSMutableArray alloc] init];
self.authors = authorArray;
[authorArray release];
// The database is stored in the application bundle.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"books.sql"];
// Open the database. The database was prepared outside the application.
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) {
// Get the primary key for all books.
const char *sql = "SELECT id, author FROM author";
sqlite3_stmt *statement;
// Preparing a statement compiles the SQL query into a byte-code program in the SQLite library.
// The third parameter is either the length of the SQL string or -1 to read up to the first null terminator.
if (sqlite3preparev2(database, sql, -1, &statement, NULL) == SQLITE_OK) {
// We "step" through the results - once for each row.
// We start with Letter A...we're building an A - Z grouping
NSString *letter = @"A";
NSMutableArray *tempauthors = [[NSMutableArray alloc] init];
while (sqlite3_step(statement) == SQLITE_ROW) {
author *author = [[author alloc] init];
author.primaryKey = sqlite3columnint(statement, 0);
author.title = [NSString stringWithUTF8String:(char *)sqlite3columntext(statement, 0)];
// FOLLOWING WAS LEFT OVER FROM ORIGINAL COMMENTS IN SQLBooks example....
// We avoid the alloc-init-autorelease pattern here because we are in a tight loop and
// autorelease is slightly more expensive than release. This design choice has nothing to do with
// actual memory management - at the end of this block of code, all the book objects allocated
// here will be in memory regardless of whether we use autorelease or release, because they are
// retained by the books array.
// if the author starts with the Letter we currently have, add it to the temp array
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} // if this is different letter, then we need to deal with that too...
else {
// create a dictionary to store the current tempauthors array in...
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letter = [author.title substringToIndex:1];
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// add the current author as this was the one that didn't match the Letter and so
// never went into the previous array...
[tempauthors addObject:author];
// release ready for the next loop...
[author release];
// clear up the remaining authors that weren't picked up and saved in the "else" statement above...
if (tempauthors.count > 0){
NSDictionary *tempDictionary = [NSDictionary dictionaryWithObject:tempauthors forKey:@"authors"];
[authors addObject:tempDictionary];
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printf("Failed preparing statement %s
", sqlite3_errmsg(database));
// "Finalize" the statement - releases the resources associated with the statement.
sqlite3_finalize(statement);
} else {
// Even though the open failed, call close to properly clean up resources.
sqlite3_close(database);
NSAssert1(0, @"Failed to open database with message '%s'.", sqlite3_errmsg(database));
// Additional error handling, as appropriate...
Message was edited by: dotnetter

Ok, so I know what the issue is now...I just don't know enough to be able to resolve it!
it's the tempAuthors objects.
It's an NSMutableArray which is create on the line before the start of the WHILE loop.
Having looked through the debugger, I can see that each dictionary object is created (with different codes which I assume are memory addresses) so all is well there. However, on each iteration of the loop in the middle there is an IF...ELSE... statement which in the ELSE section is clearing all objects from the tempAuthors array and beginning to repopulate it again.
Looking at the containing dictionary objects in the debugger I can see that the tempAuthors object that each contains has the same code (again, I'm assuming this is a memory address) - so if I understand correctly, it's the same object...I assumed that when I created the dictionary using the dictionWithObject call that I would be passing in a copy of the object, but it's referencing back to the object which I then go on to change.
Assuming the above is correct, I've tried several "stabs in the dark" at fixing it.
I've tried relasing the tempAuthors object within the ELSE and initialising it again via an alloc...init - but this didn't work and again looking through the debugger it looks as though it was confused as to which object it was supposed to be using on the following iteration of the WHILE loop (it tried to access the released object).
Having read a little more about memory management can someone tell me if I'm correct in saying that the above is because the tempAuthors object is declare outside the scope of the WHILE loop yet I then try to re-instantiate it within the loop (does that make sense???).
Sorry for the long post...the more I can understand the process the less I can hopefully stop relying on others for help so much.
I am continuing to read up on memory management etc but just not there yet.
Regards
Wayne

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Thanks ,
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Edited by: Di_Ke on Nov 13, 2007 2:14 PM

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Ive posted my code below so hopefully someone out there wll be able to see what im working with!
Thank you in advance
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hi,
i've modify your code. but i've commented your some original code because i was getting error...
please check the code...
import java.awt.event.*;
import java.applet.*;
import java.awt.*;
<applet code="ImageWithMulti.class" width=100 height=140></applet>
public class ImageWithMulti extends Applet implements ActionListener {
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    (g, 0, 0, getSize().width, getSize().height, 25, new Color(0).white);
        drawMultiUp2
    (g, 0, 0, getSize().width, getSize().height, 25, new Color(0).white);
        drawMultiDown2
    (g, 0, 0, getSize().width, getSize().height, 25, new Color(0).white);
        drawMultiUp3
    (g, 0, 0, getSize().width, getSize().height, 25, new Color(0).white);
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       drawMultiDown4
    (g, 0, 0, getSize().width, getSize().height, 25, new Color(0).white);
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Need help with an array function

I'm using the array index function and i would like to be able to control what elements go out on it. For example, if i wanted only the first element to go out, i don't want the second element to send out zero. Is there any way i can control what elements leave the array index function. I also don't understand what the index inputs do on that function either. If anyone has any advice on the application or can modify it in any way, please help.
Attachments:
Array and for loop.vi ‏1190 KB

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my Mail ID:
[email protected]
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Message was edited by:
drvijayy2k2

Help plz regarding array and DB

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