Hi,
I was wondering what would be the optimal way to select 1 matching row
from multiple tables. Here is the scenario.
Multiple tables contain a primary key KEY. If Table1 contains a
matching KEY, then I want that row from Table1. Only if it isn't in
Table1, then look in Table2 if it is t
Dan Kennedy wrote:
On Fri, 2007-05-04 at 18:22 -0400, Vitali Lovich wrote:
Multiple tables contain a primary key KEY. If Table1 contains a
matching KEY, then I want that row from Table1. Only if it isn't in
Table1, then look in Table2 if it is there. If not in Table2 go on to
Table3
I think you need to clarify your needs a bit, cause it seems somewhat
confusing.
So you have a wireless network, where all the nodes connect wirelessly
to it. What is the database being used for? Is each node accessing and
updating a local copy of some database (i.e. what other nodes it can
I'm confused with your statement about threads.
With multi-core multi-cpu machines becoming more prevalent on the
desktop, seems to me that multi-threaded apps would provide better
performance (obviously for specific problem sets). Also, don't apps
that properly separate UI and background wor
The only way I can think of doing it without modifying the table (i.e.
adding a rowid column that's updated on every delete) is to select all
the rows on the table
and then increment count for every step that returns a row.
Adam Megacz wrote:
Hello. This is probably a stupid question, but...
Can you please clarify why this would be needed? Sqlite databases are
opened by name, thereby you can use standard OS or stdlib functions to
open the same file with a different handle.
Cyrus Durgin wrote:
i'm wondering if there's a "standard" way to get an open file handle from an
sqlite3 poi
Two approaches - use sqlite, or use OS code.
Use proper filesystem synchronization as appropriate for the given OS &
filesystem, where you guarantee that your db copy is the only one that
holds an exclusive lock. Then do the file copy and release the lock.
The better approach, IMHO would be to
My question is how you're measuring the memory useage? Are you
accounting for the space overhead of the various bookkeeping sqlite
needs (i.e. master table)? The way you're creating you're table implies
you're not using autoincrement for the integer field - are you
accounting for the extra in
Well, you don't have to list the columns if you're not changing the
ordering.
INSERT INTO table1 SELECT * FROM table2;
Rich Rattanni wrote:
I have two tables in a database with exactly the same schema
(idNum PRIMARY KEY, data1, data2)
I want to copy all the records in table 2 to table 1, curr
?
Memory measurement is done by sqlite3GenericMalloc using
SQLITE_ENABLE_MEMORY_MANAGEMENT macro enabled. Calculating each allocation
size gives total memory allocation.
Thanks.
On 10/17/07, Vitali Lovich <[EMAIL PROTECTED]> wrote:
My question is how you're measuring the memory
Sorry - then I don't really know a syntactically shorter way
On 10/17/07, Rich Rattanni <[EMAIL PROTECTED]> wrote:
>
> I am not changing the ordering, but i do not want to copy the primary
> key field since it is auto increment (I neglected too mention that
> before, sorry)
debz wrote:
> I have downloaded tclsqlite-3.5.6.so.gz(with tcl binding , i need tcl).I dont
> know how to install.plz help.
>
>
You should be able to either put it into a common system library path
(i.e. /usr/lib) or set the environment variable LD_LIBRARY_PATH before
invoking the program t
Actually, the correct way would be to do make CC=compilername, although
for most situations it may produce the same effect. Also, SQLite uses
autotools, so it's just a matter of doing CC=compilername ./configure.
You can find more info using ./configure --help. Also, for
cross-compilation, yo
From what I remember, an attempt at database compatibility is attempted
across major revision numbers (i.e. all SQLite v2 revisions can read
SQLite v2 databases, all SQLite v3 revisions can read SQLite v3
databases), but I can't remember. I don't believe it's generally
recommended to be doing
I'm trying to call the sqlite3_prepare command with the string 'CREATE
TABLE $table ( $columns );'. It fails and the errmsg functions returns
'near "$table": syntax error'. I've tried using ? as well and I get the
same message. What am I missing?
Thanks
Never mind. I just realized (from rereading a previous newsgroup
posting) that the wildcards can only be used to replace values within
expressions (and not the table or column names).
My suggestion to speed up the step call backs would be to have the JNI
code do the actual step routine and cache up the pertinent information
into an array.
Then after it's complete or the cache limit is reached (set the cache
limit to a sufficient size such that the time spent processing that
I have a statement along the lines of:
"SELECT * FROM table WHERE value LIKE :abc"
I want to bind a UTF-16 string to abc - however, it can potentially
contain % or _ - does sqlite provide any functionality for escaping
these characters (I know I have to use the escape clause, but I still
have
dify the values I'm using to query).
Dennis Cote wrote:
Vitali Lovich wrote:
I have a statement along the lines of:
"SELECT * FROM table WHERE value LIKE :abc"
I want to bind a UTF-16 string to abc - however, it can potentially
contain % or _ - does sqlite provide any functionality
values are simply bound). I was hoping that I could bypass figuring out
the precise performance hit if I could figure out a clever way of doing
this (right now sqlite only accounts for about 16% of the time spent).
Thanks anyways
Dennis Cote wrote:
Vitali Lovich wrote:
Maybe there's somet
ile
the query every time the fields needed changes (which for my purposes
could potentially be never or rarely). It also allows me to use the =
operator to ensure that the id3 tags match exactly.
Dennis Cote wrote:
Vitali Lovich wrote:
Yeah, I know I can do that, and that's my backup option.
This actually isn't really something that really has a user interface
(at least not at the moment).
sourceforge.net/projects/networkmedia for the little blurb - basically
I'm working on a way of synchronizing disjoint music collections - i.e.
music collection on laptop, music collection on mai
Sorry.. Pressed send before completing the explanation. Most of the
time is spent actually just creating the db representation of the
library, which is a fairly significant amount of time - it's inserting
at about 3-5 mp3 files per second into the DB, but that's only a
profiled release build.
I'm fairly certain that it's because when you're saying ring_time >
'10', it's asking sqlite to take all strings that are greater than the
string '10'. So all the numbers you presented are greater than 1. What
you want is "where ring_time > 10". Notice the lack of quotes which
means treat 10
Regarding your code snippet:
// SQL Statement is: "SELECT * FROM table WHERE name LIKE ?"
search = '%test%';
sqlite3_bind_text(prepared_statement, 0,search , search , SQLITE_STATIC);
First I'm not sure what language you're using - it seems Perl-like.
Anyways, the documentation for
http://www.s
Try instead of "SELECT * FROM table WHERE name LIKE ?" as your sql query,
"SELECT * FROM table WHERE name LIKE :comparison"
Thomas Zangl wrote:
Vitali Lovich schrieb:
Regarding your code snippet:
// SQL Statement is: "SELECT * FROM table WHERE nam
http://www.sqlite.org/sharedcache.html
It's controlled at runtime by the function
int sqlite3_enable_shared_cache(int);
Thus that behaviour is probably controlled by Firefox (assuming it uses a
version of sqlite with cache support compiled in). You'd have to ask them.
Jay Sprenkle wrote:
G
Careful when using time. The bash built-in called time times 1 shell
statement (including pipes). The binary in /usr/bin/time only times the
command given - it does not span pipes.
[EMAIL PROTECTED] wrote:
> On Tue, Jul 29, 2008 at 02:15:54AM -0500, Robert Citek wrote:
>
>> Are you sure tim
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