db_insert("table")->fields(array('field1' => 'value1', 'field2' => 'value2', 'fieldn' => $valuen))->execute();

$values[] = array('field1' => 'val1', 'field2' => 'val2', 'fieldn' => $valn);
$values[] = array('field1' => 'value1', 'field2' => 'value2', 'fieldn' => $valuen);
$query = db_insert(‘table')->fields(array('field1', 'field2', 'fieldn'));
foreach ($values as $record) {
   $query->values($record);
}
$query->execute();

db_update('imports')
   ->condition('name', 'Chico')
   ->fields(array('address' => 'Go West St.'))
   ->execute();
//等同于：

UPDATE {imports} SET address = 'Go West St.' WHERE name = 'Chico';

db_delete('imports')
   ->condition('name' => 'Zeppo')
   ->execute();

db_merge('people')
  ->key(array('job' => 'Speaker'))
  ->insertFields(array('age' => 31,'name' => 'Meredith'))
  ->updateFields(array('name' => 'Tiffany'))
  ->execute();
//如果存在job为Speaker的一条记录，则更新name为Tiffany，如果不存在，就插入一条age为31，name为Meredith，job为Speaker的记录。

db_update('example_table')
  ->expression('count', 'count + 1')
  ->condition('field1', $some_value)
  ->expression('field2', 'field2 + :inc', array(':inc' => 2))
  ->execute();

$query = db_select('node', 'n');
$query->addField('n', 'name', 'label');
$query->addField('n', 'name', 'value');