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PDO SQLite cannot update record: "database is locked"


PDO SQLite cannot update record: "database is locked"

By : user2950223
Date : November 17 2020, 11:52 AM
this will help Here is a shortened version of one way to handle queries so that the connection is closed each time a query is run, freeing up SQLite for the next query:
code :
define("DBC", "sqlite:database_name.db");

/*
 * dataQuery($query) - one argument (required), a query string
 * generic query function where the query must be specified in source where data is required e.g,
 *
 *      $getFoo = "SELECT `foo` FROM `bar` ORDER BY `glorp`";
 *      $results = dataQuery($getFoo);
 *
 * All functions forming a query utilize this single function to return the results of their queries. The database
 * connection is instantiated and then destroyed (when the script completes) within this function.
 */

function dataQuery($query)
{
    // establish database connection
    try
    {
        $db = new PDO(DBC);
        $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    }
    catch(PDOException $e)
    {
        $errorMsg = $e->getMessage();
        return $errorMsg;
    }

    // try to run query
    try
    {
        $queryResults = $db->query($query);
        if($queryResults != null)
        {
            $results = $queryResults->fetchAll(PDO::FETCH_OBJ); // return an object, you can return an array
            $queryResults = NULL; // closes the connection
            return $results;
        }
    }
    catch(PDOException $e)
    {
        $errorMsg = $e->getMessage();
        return $errorMsg;
    }
}
$query = "SELECT `foo` FROM `bar`";
$results = dataQuery($query);


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what Exception will be thrown when select a MySQL record that is locked with "FOR UPDATE"?

what Exception will be thrown when select a MySQL record that is locked with "FOR UPDATE"?


By : Moustafa Emara
Date : March 29 2020, 07:55 AM
help you fix your problem I believe, no exception will be thrown, calling Java thread just will be blocked until RDBMS releases locked data. It's normal situation, so need to throw an exception. Think of it as an analog of synchronized block in Java -- JVM doesn't throw an exception when thread tries to enter synchronized block which is occupied by another thread already.
The only situations when exception can be thrown here are:
TortoiseSVN error "Working copy locked" "sqlite: attempt to write a readonly database" - Can this be

TortoiseSVN error "Working copy locked" "sqlite: attempt to write a readonly database" - Can this be


By : Ricardo Hadrian Chan
Date : March 29 2020, 07:55 AM
hop of those help? Working copies on shares frequently cause problems (including/especially with permissions) - as a result, it is not a recommended configuration. There actually was a bug in quite a few releases of Samba that was triggered by SVN 1.5 or 1.6 which caused a number of issues like this. It can be worked around with a change to the Samba configuration - but this may not resolve all of your issues. Best practice is to not do what you are doing - only operate on WCs locally, not via shares
Why does SQLite give a "database is locked" for a second query in a transaction when using Perl's DBD::SQLite?

Why does SQLite give a "database is locked" for a second query in a transaction when using Perl's DBD::SQLite?


By : Bill
Date : March 29 2020, 07:55 AM
To fix this issue Not related to this in anyway is it: Transaction and Database Locking from the DBD::SQLite perldoc?
android sqlite "database is locked" errors despite use of content provider and sequential database access

android sqlite "database is locked" errors despite use of content provider and sequential database access


By : Shawn Dastagir
Date : March 29 2020, 07:55 AM
may help you . SQLite guarantees sequential access from multiple threads as long as you use a single database connection. How and where are you opening and closing the database connection?
I generally recommend opening the database once on startup, and never closing it. There's no benefit to closing, since the transactional nature of SQLite means that writes are flushed to persistent storage as soon as possible anyway.
Django + SQLite how to increase SQLite timeout when "database is locked" error occurs

Django + SQLite how to increase SQLite timeout when "database is locked" error occurs


By : Jonathan Nicol
Date : March 29 2020, 07:55 AM
I wish this helpful for you So, yes it goes in the settings file but not just directly in the settings file but under DATABASES (of course).
My DATABASES part now looks a bit like this:
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