The main gotcha to this, is that if you're debugging a Mahara instance
that's running in MySQL, and you copy out one of the SQL queries
generated by Mahara and try to run it manually in a separate MySQL
If you do that, and the query uses ||, it'll error out unless you have
first manually run
The full list of things we do when setting up a connection to a MySQL
DB, is in the "configure_dbconnection()" function in htdocs/lib/dml.php.
SET NAMES 'utf8';
SET CHARACTER SET utf8;
And if you're using $CFG->dbtimezone, we also do
So if you notice discrepancies when running Mahara-generated SQL queries
in a MySQL client, one thing to try is to run all of those in the client
and see if it makes a difference.
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MySql concat string needs to be used instead of ||
Status in Mahara:
OS: Ubuntu 14.04
DB: Mysql 5.5
I've noticed that in htdocs/search/internal/lib.php, the SQL used to
concatenate strings is '||'.
For example, line 275:
$sql = $alias . '.' . $field . ' ' . db_ilike() . " '%' || ? || '%'";
Unfortunately, this doesn't always work with Mysql. In order for this to work
we would need to set PIPES_AS_CONCAT
Please refer to the documentation:
Otherwise, strings need to be concatenated using: 'CONCAT'.
This function is also available in Postgres.
So, perhaps we should be using CONCAT instead of '||'.
So, the above line 275 would be:
$sql = $alias . '.' . $field . ' ' . db_ilike() . " concat('%', ? , '%')";
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