Can we create custom type which is of type java.util.List?
CREATE TYPE list
EXTERNAL NAME 'java.util.List'
LANGUAGE JAVA;
Types can be created based on an existing supported type, so this cannot be used for your purpose.
The SQL equivalent of a list is an ARRAY. You should use an array such as INTEGER ARRAY, or VARCHAR(100) ARRAY. The Java form of the array to use in the Java static method is Object[].
Related
Maybe superfluous, but some intro...
I am rewriting an add-in for my CAD-application (using VB.NET).
This add-in reads, via an API, a bunch of metadata from a file, presents it in a Form. This data can then be (partially) changed and written back to the file.
This metadata is accessible in a consistent way, however the data type is not the same everywhere (String, Currency, Date, Boolean, Long and IPictureDisp).
Currently I have a much too complex class with several arrays. I thought it might be smarter to create a structure. The problem is the varying data type.
Is it possible to define a structure with a member with varying datat type, or am I forced to define a different structure for each data type?
You have a few options...
1: Use Object
Nice and simple, every data type inherits from Object - so if your struct contains a property of type Object, you can put pretty much any data type in there
From the docs:
The Object data type can point to data of any data type, including any object instance your application recognizes. Use Object when you do not know at compile time what data type the variable might point to.
However, this does mean that you will get next to no help from the compiler when you are trying to write code using this property. You will also probably have to cast any time you need to do anything type-specific
2: Generic Types
This will not fit situations where you are not sure of the type. You can create a generic struct using the Of syntax.
You'd create it as so:
Structure MyStructure(Of T)
'our changing type
Dim MyCustomData As T
'...alongside regular types
Dim Name As String
Dim OtherThing As Integer
End Structure
and then when you need to create the structure, you'd simply pass the type in and assign the value
Dim struct As New MyStructure(Of Integer)
struct.MyCustomData = 123
Dim struct2 As New MyStructure(Of String)
struct2.MyCustomData = "a"
I've written an ABAP Method, which returns me some analyses in a custom table.
Now I want to call this Method from an RFC module.
So far so good - the method works fine, but I'm curious of how to return this table?
Do I have to create a table / structure ... in SE11 to make it work because otherwise I can't refer to this table type or is there an easier way?
I'm quite new to ABAP so I don't know the best practices.
m_analyses = new zcl_manalyses( ).
data(lt_m_analyses) = m_analyses->analyse_m_data(
budat_from = budat_from
budat_to = budat_to
).
The TYPES statement can not only occur inside a method's body, but also inside the class definition, in which case it can be accessed from other places with class_name=>type_name (if it's public):
CLASS cl_user_registry DEFINITION PUBLIC.
PUBLIC SECTION.
TYPES:
BEGIN OF user,
firstname TYPE string,
lastname TYPE string,
END OF user,
users TYPE STANDARD TABLE OF user.
METHODS:
get_current_users
RETURNING users.
ENDCLASS.
DATA current_users TYPE cl_user_registry=>users.
current_users = cl_user_registry=>get_current_users( ).
You first have to create a structure in ABAP Dictionary (SE11), then you create a table type in SE11 as well.
You then reference the structure in the line type of the table type.
Try using the new global table type, it should work. (with typing 'TYPE')
Out of curiosity, I tried to create an ABAP interface with name object. The compiler gives the error message "OBJECT" is a protected type name and therefore cannot be used for a user's own type definitions.
While this check is certainly a good idea, I could not find a reference to protected type name in the ABAP Keyword documentation. Are there others?
The naming conventions indicate the possible names additionally to the mandatory naming "convention":
The names of predefined ABAP types or predefined data objects must not be used for data types or data objects.
NB: I tried names of predefined data objects, they are allowed for data types, so I guess "respectively" is to be understood implicitly.
Self-defined data types must not have the name of a built-in ABAP type. This applies to type definitions in the ABAP language and in the ABAP Dictionary.
Concerning the generic types, only those made of one word are forbidden, i.e. HASHED, INDEX, SORTED, and STANDARD are allowed (and also REF):
ANY, C, CLIKE, CSEQUENCE, DATA, DECFLOAT, N, NUMERIC, OBJECT, P, SIMPLE, TABLE, X, XSEQUENCE
Other types are protected like the built-in concrete (i.e. not generic) types (error <XXXX> is a protected type name and therefore cannot be used for a user's own type definitions):
D, DECFLOAT16, DECFLOAT34, F, I, STRING, T, XSTRING
CURSOR
Obsolete types 1 and 2 (their names are also forbidden inside classes and interfaces because the name must start with A-Z, underscore).
Other types may be forbidden (error Type <XXXX> is reserved for future further developments of the ABAP language. Choose another name.) like:
INT, INT1, INT2, INT4, INT8
The list is not exhaustive. I didn't find an official list in the ABAP documentation nor in the SAP support Web site.
NB: tests done in a 7.52 system
The generic data types, which cannot be used for naming:
https://help.sap.com/doc/abapdocu_750_index_htm/7.50/en-US/abenbuilt_in_types_generic.htm
The best way to create all of your object or program or table ect.. is to put the Z or the Y before the name you want to give:
Object have to been Zobject or Yobject or ZY-YZobject
Often, we use the Z and then the module wich it refers: ZSD_OBJECT
In the sys.objects table documentation, there's a list of types with their corresponding codes:
SO = Sequence object
U = Table (user-defined)
V = View
...
Is there a native enum or const in C# that would match these Sql object type?
The closest enum I've found is the DAC ObjectType Enum but it only matches some of the Sql object type.
Since SQL server is using 2 characters codes for these type, I understand that I would probably have write some mapping logic... but I'd prefer using a native enum instead of writing my own Enum.
Is there a native enum or const in C# that would match these Sql object type?
No. There is not.
I have Oracle collection type defined as:
type tab_foo as table of obj_foo
Where obj_foo is defined as:
type obj_foo as object
By calling:
select * from sys.all_types where typecode = 'COLLECTION';
I can get metadata for all the collection types, however there is no information what is the type of element contained in the collection.
How to retrieve collection element type metadata from oracle?
Look at ALL_COLL_TYPES, which lists all collection types. The column you are interested in is ELEM_TYPE_NAME.