Flask==SQLAlchemy資料型別
阿新 • • 發佈：2018-11-25
1 資料型別
| 型別名 | MySQL型別 | python型別 | 描述 |
|---|---|---|---|
| SmallInteger | smallint | int | 取值範圍較小，一般為16位 |
| Integer | int | int | 普通整數，一般32位 |
| BigInteger | bigint | int/long | 不限精度的整數 |
| Float | float | float | 浮點數 |
| Numeric | decimal | decimal.Decimal | 定點數 |
| String | varchar | str | 變長字串 |
| Text | tinytext | str | 變長字串，64K, =65535bytes |
| Text(65536) | mediumtext | str | 變長字串，max16M, =16777215bytes |
| Text(16777216) | longtext | str | 變長字串，max32M, =4294967295bytes |
| LargeBinary | blob | str | 二進位制檔案，64K |
| LargeBinary(65536) | mediumblob | str | 二進位制，max16M |
| LargeBinary(16777216) | longblob | str | 二進位制，max32M |
| PickleType | blob | 任何python物件 | 自動使用Pickle序列化，只有blog |
| Unicode | varchar | unicode | 變長字串 |
| UnicodeText | text | unicode | 變長字串，64K |
| Boolean | tinyint | bool | 布林值 |
| Date | date | datetime.date | 日期 |
| Time | time | date.time | 時間 |
| DateTime | datetime | datetime.datetime | 日期和時間 |
| Interval | datetime | datetime.timedelta | 時間間隔 |
| Enum | enum | str | 一組字串 |
2 資料庫型別設計
- 建立MySQL表
class Data(db.Model):
__tablename__ = "datas"
id = db.Column(db.Integer, primary_key=True)
smallInteger = db.Column(db.SmallInteger)
bigInteger = db.Column(db.BigInteger)
floatData = db.Column(db.Float(10))
numericData = db.Column(db.Numeric(10))
stringData = db.Column(db.String(250))
textData = db.Column(db.Text(200))
mediumText = db.Column(db.Text(65536))
longText = db.Column(db.Text(16777216))
largeBinary = db.Column(db.LargeBinary(300))
mediumBlob = db.Column(db.LargeBinary(65536))
longBlob = db.Column(db.LargeBinary(16777216))
pickle = db.Column(db.PickleType)
mediumPickle = db.Column(db.PickleType(65536))
longPickle = db.Column(db.PickleType(16777216))
unicodeData = db.Column(db.Unicode(10))
unicodeText = db.Column(db.UnicodeText)
booleanData = db.Column(db.Boolean(0))
dateData = db.Column(db.Date)
timeData = db.Column(db.Time)
dateTime = db.Column(db.DateTime)
interval = db.Column(db.Interval)
enumData = db.Column(db.Enum('father', 'mother'))
def __repr__(self):
return "Data {}".format(self.id)
- MySQL表結構
+--------------+-------------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+-------------------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| smallInteger | smallint(6) | YES | | NULL | |
| bigInteger | bigint(20) | YES | | NULL | |
| floatData | float | YES | | NULL | |
| numericData | decimal(10,0) | YES | | NULL | |
| stringData | varchar(250) | YES | | NULL | |
| textData | tinytext | YES | | NULL | |
| mediumText | mediumtext | YES | | NULL | |
| longText | longtext | YES | | NULL | |
| largeBinary | blob | YES | | NULL | |
| mediumBlob | mediumblob | YES | | NULL | |
| longBlob | longblob | YES | | NULL | |
| pickle | blob | YES | | NULL | |
| mediumPickle | blob | YES | | NULL | |
| longPickle | blob | YES | | NULL | |
| unicodeData | varchar(10) | YES | | NULL | |
| unicodeText | text | YES | | NULL | |
| booleanData | tinyint(1) | YES | | NULL | |
| dateData | date | YES | | NULL | |
| timeData | time | YES | | NULL | |
| dateTime | datetime | YES | | NULL | |
| interval | datetime | YES | | NULL | |
| enumData | enum('father','mother') | YES | | NULL | |
+--------------+-------------------------+------+-----+---------+----------------+
3 Flask-MySQL鍵屬性
| 屬性 | 描述 | 生效值 |
|---|---|---|
| primary_key | 主鍵 | True |
| unique | 鍵值唯一性 | True |
| index | 索引 | True |
| nullable | 空值 | True |
| default | 預設值 | null |
[參考文獻]
[1]https://www.cnblogs.com/Orangeorchard/p/8097547.html
[2]https://blog.csdn.net/skdkjzz/article/details/20469721