diff --git a/db/sql.php b/db/sql.php
index 4e464d7e..f816a973 100644
--- a/db/sql.php
+++ b/db/sql.php
@@ -321,19 +321,37 @@ function schema($table,$fields=NULL,$ttl=0) {
 		if (strpos($table,'.'))
 			list($schema,$table)=explode('.',$table);
 		// Supported engines
+		// format: engine_name => array of:
+		//		0: query
+		//		1: field name of column name
+		//		2: field name of column type
+		//		3: field name of default value
+		//		4: field name of nullable value
+		//		5: expected field value to be nullable
+		//		6: field name of primary key flag
+		//		7: expected field value to be a primary key
+		//		8: field name of auto increment check (optional)
+		//		9: expected field value to be an auto-incremented identifier
 		$cmd=[
 			'sqlite2?'=>[
-				'PRAGMA table_info(`'.$table.'`)',
-				'name','type','dflt_value','notnull',0,'pk',TRUE],
+				'SELECT * FROM pragma_table_info('.$this->quote($table).') JOIN ('.
+					'SELECT sql FROM sqlite_master WHERE type=\'table\' AND '.
+					'name='.$this->quote($table).')',
+				'name','type','dflt_value','notnull',0,'pk',TRUE,'sql',
+					'/\W(%s)\W+[^,]+?AUTOINCREMENT\W/i'],
 			'mysql'=>[
 				'SHOW columns FROM `'.$this->dbname.'`.`'.$table.'`',
-				'Field','Type','Default','Null','YES','Key','PRI'],
+				'Field','Type','Default','Null','YES','Key','PRI','Extra','auto_increment'],
 			'mssql|sqlsrv|sybase|dblib|pgsql|odbc'=>[
 				'SELECT '.
 					'C.COLUMN_NAME AS field,'.
 					'C.DATA_TYPE AS type,'.
 					'C.COLUMN_DEFAULT AS defval,'.
 					'C.IS_NULLABLE AS nullable,'.
+				($this->engine=='pgsql'
+					?'COALESCE(POSITION(\'nextval\' IN C.COLUMN_DEFAULT),0) AS autoinc,'
+					:'columnproperty(object_id(C.TABLE_NAME),C.COLUMN_NAME,\'IsIdentity\')'
+						.' AS autoinc,').
 					'T.CONSTRAINT_TYPE AS pkey '.
 				'FROM INFORMATION_SCHEMA.COLUMNS AS C '.
 				'LEFT OUTER JOIN '.
@@ -356,7 +374,7 @@ function schema($table,$fields=NULL,$ttl=0) {
 					($this->dbname?
 						(' AND C.TABLE_CATALOG='.
 							$this->quote($this->dbname)):''),
-				'field','type','defval','nullable','YES','pkey','PRIMARY KEY'],
+				'field','type','defval','nullable','YES','pkey','PRIMARY KEY','autoinc',1],
 			'oci'=>[
 				'SELECT c.column_name AS field, '.
 					'c.data_type AS type, '.
@@ -397,7 +415,13 @@ function schema($table,$fields=NULL,$ttl=0) {
 								preg_replace('/^\s*([\'"])(.*)\1\s*/','\2',
 								$row[$val[3]]):$row[$val[3]],
 							'nullable'=>$row[$val[4]]==$val[5],
-							'pkey'=>$row[$val[6]]==$val[7]
+							'pkey'=>$row[$val[6]]==$val[7],
+							'auto_inc'=>isset($val[8]) && isset($row[$val[8]])
+								? ($this->engine=='sqlite'?
+									(bool) preg_match(sprintf($val[9],$row[$val[1]]),
+										$row[$val[8]]):
+									($row[$val[8]]==$val[9])
+								) : NULL,
 						];
 					}
 				if ($fw->CACHE && $ttl)
diff --git a/db/sql/mapper.php b/db/sql/mapper.php
index 1eb45c6d..c65bfe98 100644
--- a/db/sql/mapper.php
+++ b/db/sql/mapper.php
@@ -438,17 +438,20 @@ function insert() {
 			// duplicate record
 			foreach ($this->fields as $key=>&$field) {
 				$field['changed']=true;
-				if ($field['pkey'] && !$inc && $field['pdo_type']==\PDO::PARAM_INT
-					&& !$field['nullable'])
+				if ($field['pkey'] && !$inc && ($field['auto_inc'] === TRUE ||
+						($field['auto_inc'] === NULL && !$field['nullable']
+							&& $field['pdo_type']==\PDO::PARAM_INT)
+				))
 					$inc=$key;
 				unset($field);
 			}
 		foreach ($this->fields as $key=>&$field) {
 			if ($field['pkey']) {
 				$field['previous']=$field['value'];
-				if (!$inc && $field['pdo_type']==\PDO::PARAM_INT &&
-					empty($field['value']) && !$field['nullable'] &&
-					is_null($field['default']))
+				if (!$inc && empty($field['value']) &&
+					($field['auto_inc'] === TRUE || ($field['auto_inc'] === NULL
+						&& $field['pdo_type']==\PDO::PARAM_INT && !$field['nullable']))
+				)
 					$inc=$key;
 				$filter.=($filter?' AND ':'').$this->db->quotekey($key).'=?';
 				$nkeys[$nctr+1]=[$field['value'],$field['pdo_type']];