PDO::pgsqlLOBCreate
Creates a new large object
&reftitle.description;
stringPDO::pgsqlLOBCreate
PDO::pgsqlLOBCreate creates a large object and
returns the OID of that object. You may then open a stream on the object
using PDO::pgsqlLOBOpen to read or write data to
it. The OID can be stored in columns of type OID and be used to reference
the large object, without causing the row to grow arbitrarily large.
The large object will continue to live in the database until it
is removed by calling PDO::pgsqlLOBUnlink.
Large objects can be up to 2GB in size, but are cumbersome to use; you need
to ensure that PDO::pgsqlLOBUnlink is called prior
to deleting the last row that references its OID from your database.
In addition, large objects have no access controls. As an alternative,
try the bytea column type; recent versions of PostgreSQL allow bytea
columns of up to 1GB in size and transparently manage the storage for
optimal row size.
This function must be called within a transaction.
&reftitle.parameters;
PDO::pgsqlLOBCreate takes no parameters.
&reftitle.returnvalues;
Returns the OID of the newly created large object on success, or &false;
on failure.
&reftitle.examples;
A <function>PDO::pgsqlLOBCreate</function> example
This example creates a new large object and copies the contents
of a file into it. The OID is then stored into a table.
setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->beginTransaction();
$oid = $db->pgsqlLOBCreate();
$stream = $db->pgsqlLOBOpen($oid, 'w');
$local = fopen($filename, 'rb');
stream_copy_to_stream($local, $stream);
$local = null;
$stream = null;
$stmt = $db->prepare("INSERT INTO BLOBS (ident, oid) VALUES (?, ?)");
$stmt->execute(array($some_id, $oid));
$db->commit();
?>
]]>
&reftitle.seealso;
PDO::pgsqlLOBOpen
PDO::pgsqlLOBUnlink
pg_lo_create