...下图展示了MySQL JDBC允许的跨类型相互转换。...MySQL数据类型可以被转换的Java类型 CHAR, VARCHAR, BLOB, TEXT, ENUM, and SET java.lang.String, java.io.InputStream, 4K10 C语言枚举类型(Enum) C语言枚举类型(Enum): 定义形式为:enum typeName{ valueName1, valueName2, valueName3, ... }; enum...
Column(db.String(50), unique=True, nullable=False) size = db.Column(db.Enum("SMALL", "MEDIUM", "LARGE"), default="MEDIUM") address = db.Column(db.String(150), nullable=True) def save(self): """保存数据""" db.session.add(self) db.session.commit() def __repr__(self): return...
mysql> insert into test (name, sex) values('a', 'male'), ('b', 'female'), ('c', 'male'); mysql> select * from test; +---+---+ | name | sex | +---+---+ | a | male | | b | female | | c | male | +---+---+ 3 rows in set (0.00 sec) 创建枚举类型时,...
[FlagEnum]::B # 7 [FlagEnum]::C + [FlagEnum]::C # 8 ) foreach ($Value in $FlagValues) { [pscustomobject]@{ "ToString('G')" = $Value.ToString('G') "ToString('D')" = $Value.ToString('D') "ToString('X')" = $Value.ToString('X') "ToString('F')" = $Value.ToString...
On msvc, you may need to enablewarning C4062to getswitchcase exhaustiveness checking. History The original version of the library was developed by the author in the winter of 2012-2013 at Hudson River Trading, as a replacement for an older generator calledBETTER_ENUM....
(stringSeparators, StringSplitOptions.TrimEntries); Show(result); // Split the string and return all non-empty elements Console.WriteLine("2c) Return all non-empty elements:"); result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries); Show(result); // Split the string and return...
public static ColumnTypeEnum fromString(String name) Creates or finds a ColumnTypeEnum from its string representation. Parameters: name - a name to look for. Returns: the corresponding ColumnTypeEnum.values public static Collection values() Gets known ColumnTypeEnum values. Returns: known ColumnTy...
string是函数EnumType##FromNSString的参数,展开时自动填入; 例如:ENUM_STRCMP(King, 13),展开后:if ([string isEqualToString:@"King"]) return King; 参考资料 示例代码 Easy way to use variables of enum types as string in C? About 通过宏替换,实现OC枚举值与字符串相互转换 ...
("{:?}", self) } } fn main() { let a = Message::Quit; let b = Message::Move { x: 12, y: 24 }; let c = Message::Write(String::from("Hello")); let d = Message::ChangeColor(0, 255, 255); a.call(); b.call(); c.call(); d.call(); } match 捕获枚举绑定的值...
= Guangzhou; 注意等号右边只能取枚举子中的某一个；特别地，以Guangzhou为例，虽然Guangzhou==4, 但以下初始化是出错的： some_big_cities wh = 4; Visual C++ 2005编译器提示： error C2440: 'initializing' : cannot convert from ...