def internal_types
{
'char' => String,
'character' => String,
'varchar' => String,
'char varying' => String,
'character varying' => String,
'nchar' => String,
'national char' => String,
'national character' => String,
'national character varying' => String,
'bit' => String,
'bit varying' => String,
'int' => Integer,
'integer' => Integer,
'smallint' => Integer,
'numeric' => Float,
'decimal' => Float,
'dec' => Float,
'float' => Float,
'real' => Float,
'double precision' => Float,
'date' => Date,
'time' => Time,
'timestamp' => Timestamp,
'interval' => Integer
}
end