insert into tbl_setenum(setc,enumc)value(1,2); root@localhost: 00:33 [7308][db_hlf]>insert into tbl_setenum(setc,enumc)value(1,2); Query OK, 1 row affected, 1 warning (0.01 sec) root@localhost: 00:34 [7308][db_hlf]>select * from tbl_setenum; +---+---+---+ | id ...
4);// 成员变量privateString name;privateint index;// 构造方法privateColor(String name,int index){this.name=name;this.index=index;}// 普通方法publicstaticStringgetName(int index){for(Color c:Color.values()){if(c.getIndex()==index){returnc.name;}}returnnull;}// get set 方法publicString...
1、EnumSet EnumSet 是一种专门为枚举类型所设计的 Set 类型。 与HashSet相比,由于使用了内部位向量表示,因此它是特定 Enum 常量集的非常有效且紧凑的表示形式。 EnumSet 是抽象类,其有两个实现:RegularEnumSet 、JumboEnumSet,选择哪一个取决于实例化时枚举中...
整型一共有五种:TINYINT、SMALLINT、MEDIUMINT、INT、BIGINT,其中TINYINT属于整型类型中最小的,存储的值必须为整型的数值,否则会被默认转换或报错(注:取决于MySQL运行时设置的SQL_MODE值要求)。 接下来要讲数据类型测试,今天先讲“布尔类型BOOL/BOOLEAN 与 微整型TINYINT”,枚举类型ENUM和“集合类型 SET”的测试内...
}// 普通方法publicstaticStringgetName(int index){for(Color c:Color.values()){if(c.getIndex()==index){returnc.name;}}returnnull;}// get set 方法publicStringgetName(){returnname;}publicvoidsetName(String name){this.name=name;}publicintgetIndex(){returnindex;}publicvoidsetIndex(int index...
publicstringmessage{get;privateset;} publicError(intcode,stringmessage) { this.code=code; this.message=message; } } 这也是C#的enum鸡肋的地方。当然这并不是枚举了,只不过到达了相似效果。 接着我们来看Java的enum,就会发现它比较好一些了。还拿上面这个例子来说,比如: ...
()' Declare the non-exclusive enumeration object and' set it to multiple values.DimpermAsFilePermissions perm = FilePermissions.ReadOrFilePermissions.Update' Show the values in the enumeration object.Console.WriteLine(perm.ToString)' Output: Read, Update' Show the total integer value of all values...
This chapter defines the enum types in C#. Enums create a set of named constants and are represented by an underlying integral set of values.
Determines whether one or more bit fields are set in the current instance. IsDefined(Type, Object) Returns a Boolean telling whether a given integral value, or its name as a string, exists in a specified enumeration. IsDefined<TEnum>(TEnum) Returns a boolean telling whether a given inte...
Conversion of the value to / from the drive parameters failed Unknown SoftMotion parameters SMC_H_AXIS_WASNT_STANDSTILL 170 Axis has not been in standstill state. SMC_H_AXIS_DIDNT_START_HOMING 171 Error at start of homing action. SMC_H_AXIS_DIDNT_ANSWER 172 Error at start of...