php SQLite3


Php SQLite3

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4 years ago

As of PHP 5.4 support for Sqlite2 has been removed. I have a large web app that was built with sqlite2 as the database backend and thus it exploded when I updated PHP. If you're in a similar situation I've written a few wrapper functions that will allow your app to work whilst you convert the code to sqlite3.

Firstly convert your DB to an sqlite3 db.

sqlite OLD.DB .dump | sqlite3 NEW.DB

Then add the following functions to your app:

function sqlite_open($location,$mode)
$handle = new SQLite3($location);
$array[‘dbhandle’] = $dbhandle;
$array[‘query’] = $query;
$result = $dbhandle->query($query);
#Get Columns
$i = 0;
while (
$columns[ ] = $result->columnName($i);

$resx = $result->fetchArray(SQLITE3_ASSOC);

They’re not perfect by any stretch but they seem to be working ok as a temporary measure while I convert the site.
Hope that helps someone



2 years ago

As reported here: there are two undocumented and useful methods available:

SQLite3::createCollation(collation name, callback function) appeared in PHP 5.3.11 and allows to define a custom collation method.

SQLite3Stmt::readOnly(void) appeared in PHP 5.3.5 and returns true if a statement doesn’t write in the database.

See the documentation pages on the corresponding classes for my comments showing example use of those methods.



2 years ago

Another undocumented feature of the PHP SQLite3 object, available since 2009 is openBlob. Basically it's a function that will return a stream pointer to a blob value in a table. Very very useful when you are dealing with files stored in a SQLite3 database.

Source code says:

proto resource SQLite3::openBlob(string table, string column, int rowid [, string dbname])
Open a blob as a stream which we can read / write to.

But despite that it’s not possible to write to the blob, only to read (the write method is empty in the extension source code: it won’t return any error but no change will be recorded).

One example of use:


$db = new SQLite3(‘files.sqlite’);
$db->exec(‘CREATE TABLE files (id INTEGER PRIMARY KEY, filename TEXT, content BLOB);’);

$statement = $db->prepare(‘INSERT INTO files (filename, content) VALUES (?, ?);’);
$statement->bindValue(‘filename’, ‘’);
$statement->bindValue(‘content’, file_get_contents(‘’));

$fp = $db->openBlob(‘files’, ‘content’, $id);

while (!feof($fp))



You can also seek in the stream. This is pretty useful for saving large files from the database too, this way you can use stream_copy_to_stream, it will be faster and more memory-efficient than dumping the file in memory before writing it to the disk.

Please note that openBlob() won’t work on VIRTUAL FTS4 compressed tables.

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