/**
* @param DatabasePostgres $db
* @param string $table
* @param string $field
* @return null|PostgresField
*/
static function fromText(DatabasePostgres $db, $table, $field)
{
$q = <<<SQL
SELECT
attnotnull, attlen, conname AS conname,
atthasdef,
adsrc,
COALESCE(condeferred, 'f') AS deferred,
COALESCE(condeferrable, 'f') AS deferrable,
CASE WHEN typname = 'int2' THEN 'smallint'
WHEN typname = 'int4' THEN 'integer'
WHEN typname = 'int8' THEN 'bigint'
WHEN typname = 'bpchar' THEN 'char'
ELSE typname END AS typname
FROM pg_class c
JOIN pg_namespace n ON (n.oid = c.relnamespace)
JOIN pg_attribute a ON (a.attrelid = c.oid)
JOIN pg_type t ON (t.oid = a.atttypid)
LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f')
LEFT JOIN pg_attrdef d on c.oid=d.adrelid and a.attnum=d.adnum
WHERE relkind = 'r'
AND nspname=%s
AND relname=%s
AND attname=%s;
SQL;
$table = $db->remappedTableName($table);
$res = $db->query(sprintf($q, $db->addQuotes($db->getCoreSchema()), $db->addQuotes($table), $db->addQuotes($field)));
$row = $db->fetchObject($res);
if (!$row) {
return null;
}
$n = new PostgresField();
$n->type = $row->typname;
$n->nullable = $row->attnotnull == 'f';
$n->name = $field;
$n->tablename = $table;
$n->max_length = $row->attlen;
$n->deferrable = $row->deferrable == 't';
$n->deferred = $row->deferred == 't';
$n->conname = $row->conname;
$n->has_default = $row->atthasdef === 't';
$n->default = $row->adsrc;
return $n;
}