修改数据类型关系
| 类型定义 | 旧 | 新 |
|---|---|---|
| typeMediumInteger | number($length, 0) | int |
| typeSmall | number($length, 0) | smallint |
| typeTinyInteger | number($length, 0) | tinyint |
| typeFloat | number($column->total, $column->places) | typeDouble |
| typeDouble | number($column->total, $column->places) | double($column->total, $column->places)/double |
| typeDecimal | number($column->total, $column->places) | decimal($column->total, $column->places) |
| typeBoolean | char(1) | tinyint(1) |