postgres enum type

implicit conversion from enumeration type ' enum Cgimagealphainfo ' to different enumeration type ' CGBCategory: iOS development 2013-11-28 15:55 745 people read comments (0) favorite reports CgimagealphainfocgcontextrefcgbitmapcontextcreatcgbitmapinfokcgbitmapbyteorderdeWhen using the XCODE5 SDK iOS7 environment, creating a graphical context for drawing, mer

struct type The underlying data types are structs, such as int Float bool, which are brought by swift and are used as a development basis for developersIn Swift, a struct (struct) is very similar to a class type (class), a struct is a value type and a class is a reference type.Define the format:struct Name: protocol ... {Properties and Methods}Such as:struct

Enum type: Purpose is integer and character correspondence. Here is just a description of the anonymous enumeration type, enum {__align=8}; This anonymous enumeration is equivalent to a static constant, similar to the following static const int __align=8; Union type: The me

This auction state, originally in the front-end interface through the HTML code to write dead several states, now need to change dynamically loaded. This few states are defined by the enumeration type.1: define an enumeration type // //resource status // public enum resourcestate { // //lower Shelf // [Description ("bottom shelf")] soldout = 0, // //s

Tags: type enum postgres OpenStack alembicWhen using Alembic to develop the management database, you will encounter a troublesome problem, is to change the enumeration type of a column, in fact, the use of SQL command change is quite simple, an alter execution:ALTER TYPE Sta

The enum type is defined as follows: Public Enum Interactivetype {Nothing = 1 , // Do nothing Email = 2 , // Sent by email Jiwai = 3 // Sent back via SMS (updated via API, and then sent back through the follow function) } If we want to convert the string "email" or number to the

In addition to ordinary classes (interfaces), there are special elements that can be defined in the class diagram, the most common being enumerated types, custom types, and they are essential for a fully available model, which is mainly about how they are used in EMF. In addition, because EMF support for map is special, here is a brief introduction to the definition of the map type. Enum

Enumerations are a good thing, and as with structs, you can define a data type, but an enumeration has the advantage that it can specify the initial value of the definition by default. There is a project that involves CPU cards, cards have errors, power up, DF01 directories and other states, if you define these variables separately, to use a lot of variables, here is a rule, that is: The CPU card can not be at the same time several of these states, on

After the enumeration type is registered in QT (Qt_q_enum or Qt_q_flag), it is possible to use QT's meta-object for enumeration type and string type conversion.code example:#include intMain () {Qmetaenum metaenum= qmetaenum::fromtype(); //string Goto enumeration valueQt::alignment Alignment = (qt::alignment) metaenum.keytovalue ("Qt::alignleft"); Alignment= (qt::

I recently used hibernate to map enumeration types. in MySQL databases, if the type of the enumeration type attribute is not configured in the hibernate map file, hibernate will map the enum type to the tinyblob type by default, which is very embarrassing. It seems that it w

Java Enumeration type enumEnumeration syntax1. Enum is called enumeration, which is commonly known as enumeration class in Chinese. People who have studied C/C ++ or other languages should have a slight knowledge of it.But it is introduced in the Java language specification in JDK 5 and stored in the java. lang package. In Java, the Enum is actually a syntactic s

Original URL: http://blog.csdn.net/wgw335363240/article/details/6359614Java enum-type enum useWhen I recently discussed the issue with my colleagues, my colleague suddenly mentioned why the constant values defined in Java do not take the ENMU enumeration type and are defined by the public final static

1 //The enum type before c++11 is inherited from C, tepid;2 //c++11 to enum, strengthen the type check, the introduction of the type of strongly-typed enum, the immediate bright3 //Have used QT all know, long ago should do so, wit

Original address: http://www.cppblog.com/chemz/archive/2007/06/05/25578.htmlTo the beginning of the C language enum type is used as a user-defined method for the finite set constants of the class is introduced into the language, and was once the only way to define compile-time constants in C + + (later, a static integer constant was introduced into the class).According to the description of the

Since the C language, The enum type has been introduced into the language as a constant of a finite set of user-defined classes.And once became the only method for defining constants in the compilation period in C ++ (a static integer constant was introduced in the class ).Based on the description of the enum type, wha

In my past experience, if I had to decide whether to use the enum data type of mysql, I would give up ENUM () and replace it with tinyint without thinking about it, the reason is what scenarios I have used before and are suitable for use. In my past experience, if I had to decide whether to use the enum data

C # convert enum to string for Enumeration type conversion All enumeration types are value types. System. enum is an abstract class. All enumeration types inherit from it directly, and of course all its members. All value types are system. the descendant of valuetype, And the enumeration type is no exception. The Enume

Vc,c++An enumeration of type enum lengths between builder and LCC three compilers. Various C compiler default byte alignment number is inconsistent, to write common code, often is to use#pragmaPack (1) ...#pragmaPack ()causes the compiler to align in single-byte. An error occurred today in calling the DLL for VC6 in BCB5, but invoking the DLL in the VC is normal, indicating that there is a possibility that

Enum Type 1, overview, JDK1.5 added enum type, you can use an enum to define eg: public enum gender{ Male,female; }Each of these enumeration elements is an instance of the enumerated

In practice, Enum is rarely used and is easily ignored. In fact, Enum is of the same user-defined type as struct and class. Since it is a custom type, you can have its data members and member functions! For example:Enum E {A = 1, B = 2, c = 4 };So:001: Enum e E1; //