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change the PK NAME select query from the core postgresql class to a more

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faster version
This commit is contained in:
Clemens Schwaighofer
2013-12-12 16:28:40 +09:00
parent 99860e7da2
commit dd7ab1d74b
2 changed files with 34 additions and 10 deletions
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28
www/libs/db_pgsql.inc
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@@ -2,8 +2,8 @@
/*********************************************************************
* $HeadURL: svn://svn/development/core_data/php/www/libs/db_pgsql.inc $
* $LastChangedBy: gullevek $
* $LastChangedDate: 2013-10-11 16:54:21 +0900 (Fri, 11 Oct 2013) $
* $LastChangedRevision: 4689 $
* $LastChangedDate: 2013-12-12 16:28:35 +0900 (Thu, 12 Dec 2013) $
* $LastChangedRevision: 4741 $
*********************************************************************
* AUTHOR: Clemens "Gullevek" Schwaighofer (www.gullevek.org)
* CREATED: 2003/04/09
@@ -232,13 +232,31 @@
if ($table)
{
// read from table the PK name
$q = "SELECT c.column_name ";
// slower version
/* $q = "SELECT c.column_name ";
$q .= "FROM information_schema.table_constraints tc ";
$q .= "JOIN information_schema.constraint_column_usage AS ccu USING (constraint_schema, constraint_name) ";
$q .= "JOIN information_schema.columns AS c ON c.table_schema = tc.constraint_schema AND tc.table_name = c.table_name AND ccu.column_name = c.column_name ";
$q .= "WHERE constraint_type = 'PRIMARY KEY' and tc.table_name = '".$table."'";
if ($schema)
$q .= " AND c.table_schema = '".$schema."'";
$q .= " AND c.table_schema = '".$schema."'"; */
// faster primary key get
$q = "SELECT pg_attribute.attname AS column_name, format_type(pg_attribute.atttypid, pg_attribute.atttypmod) AS type ";
$q .= "FROM pg_index, pg_class, pg_attribute";
if ($schema)
$q .= ", pg_namespace ";
$q .= "WHERE ";
// regclass translates the OID to the name
$q .= "pg_class.oid = '".$table."'::regclass AND ";
$q .= "indrelid = pg_class.oid AND ";
if ($schema)
{
$q .= "nspname = '".$schema."' AND ";
$q .= "pg_class.relnamespace = pg_namespace.oid AND ";
}
$q .= "pg_attribute.attrelid = pg_class.oid AND ";
$q .= "pg_attribute.attnum = any(pg_index.indkey) ";
$q .= "AND indisprimary";
$cursor = $this->_db_query($q);
return $this->_db_fetch_array($cursor)['column_name'];
}
@@ -364,5 +382,5 @@
}
}
// $Id: db_pgsql.inc 4689 2013-10-11 07:54:21Z gullevek $
// $Id: db_pgsql.inc 4741 2013-12-12 07:28:35Z gullevek $
?>