topic Re: like vs type in Application Development and Automation Discussions

like vs type

Former Member — Wed, 27 Dec 2006 07:24:29 GMT

Hi,

what is the difference between like and type? & how come in OO context can't use like?

Thanks,

Charles

abap newbie

Re: like vs type

SantoshKallem — Wed, 27 Dec 2006 07:29:20 GMT

LIKE means the datatype of the variable is similar to the referenced variable.

TYPE means it is a predefined data type.

Eg:

DATA int TYPE i.

Here int is of integer data type.

DATA var LIKE int.

var IS a variable having same data type of int. which in turn is integer.

You can find these helpful when you reference database table variables... You need not know what is the datatype defined.

Also it adds to FLEXIBILITY.

Whenever you make changes to your database tables and fields,

that change is REFLECTED back to your program that is,

You need not change all your program code when you change your table fields...

Re: like vs type

amit_khare — Wed, 27 Dec 2006 07:31:19 GMT

Hi,

refer to this link.

Regards,

Amit

Re: like vs type

Former Member — Wed, 27 Dec 2006 07:32:47 GMT

Hi,

Refer the Thread

Type, Types, Data, Like

Rgds,

Prakash

Re: like vs type

anversha_s — Wed, 27 Dec 2006 07:35:13 GMT

hi,

http://help.sap.com/saphelp_nw2004s/helpdata/en/fc/eb2ff3358411d1829f0000e829fbfe/frameset.htm

For TYPE

http://help.sap.com/saphelp_47x200/helpdata/en/d3/2e974d35c511d1829f0000e829fbfe/frameset.htm

For LIKE

http://help.sap.com/saphelp_47x200/helpdata/en/d3/2e974d35c511d1829f0000e829fbfe/frameset.htm

http://help.sap.com/saphelp_nw2004s/helpdata/en/fc/eb367a358411d1829f0000e829fbfe/content.htm

LIKE means the datatype of the variable is similar to the referenced variable.

TYPE means it is a predefined data type.

Eg:

DATA int TYPE i.

Here int is of integer data type.

DATA var LIKE int.

var IS a variable having same data type of int. which in turn is integer.

You can find these helpful when you reference database table variables... You need not know what is the datatype defined.

Also it adds to FLEXIBILITY.

Whenever you make changes to your database tables and fields,

that change is REFLECTED back to your program that is,

You need not change all your program code when you change your table fields...

Regards

Anver

Re: like vs type

Former Member — Wed, 27 Dec 2006 07:37:26 GMT

TYPE:

You use the 'TYPE' in various ABAP statements for defining data types and specifying the types of interface parameters or field symbols.

The TYPE addition allows you to construct new data types in the TYPES, DATA; CONSTANTS;and STATICS statements. In the TYPES statement, these are local data types in the program. In the other statements, they are attributes of new data objects.

• Definition of local program types using

TYPES <t> TYPE <type>.

The new data type <t> has the same type as <type>.

• Declaration of data objects using

DATA <f> TYPE <type>.

CLASS-DATA <f> TYPE <type>.

CONSTANTS <f> TYPE <type>.

STATICS <f> TYPE <type>.

PARAMETERS <f> TYPE <type>.

The data object <f> has a data type corresponding to the type <type>.

• Dynamic creation of data objects using

CREATE DATA <dref> TYPE <type>.

• Specification of the type of a formal parameter in a subroutine using

FORM ... USING|CHANGING TYPE <type> ...

The technical attributes of the formal parameter are inherited from those of the

declared data type <type>. You can then only pass actual parameters that have these attributes.

• Specification of the type of a formal parameter in a method using

METHODS <meth> ... IMPORTING|EXPORTING|CHANGING TYPE <type>

LIKE:

You use the LIKE, similarly to the TYPE addition, in various ABAP statements for

defining data types and specifying the types of interface parameters or field symbols. The addition LIKE <obj> can be used in the same ABAP statements as the TYPE addition to refer to any data object <obj> that is already visible at that point in the program. The expression <obj> is either the name of the data object or the expression LINE OF <table-object>

In this case, the LIKE addition describes the line type of a table object that is visible at that point in the program.

You use LIKE to make the new object or type inherit the technical attributes of an existing data object.

• Definition of local types in a program using

TYPES <t> LIKE <obj>.

The new data type <t> inherits all of the technical attributes of the data object <obj>.

• Declaration of data objects using

DATA <f> LIKE <obj>.

CLASS-DATA <f> LIKE <obj>.

CONSTANTS <f> LIKE <obj>.

STATICS <f> LIKE <obj>.

PARAMETERS <f> LIKE <obj>.

The data object <f> inherits all of the technical attributes of the data object <obj>.

• Dynamic creation of data objects using

CREATE DATA <dref> LIKE <obj>.

• Specification of the type of a formal parameter in a subroutine using

FORM ... USING|CHANGING LIKE <obj> ...

The technical attributes of the formal parameter are inherited from those of the

declared data object <obj>. You can then only pass actual parameters that have these attributes.

Re: like vs type

Former Member — Wed, 27 Dec 2006 07:44:12 GMT

so how come in OO, can't use like?

Re: like vs type

Former Member — Wed, 27 Dec 2006 07:53:33 GMT

hi,

like is indirectly addressed to the existing data object where as type is directly addressed to the existing data type .

Re: like vs type

Former Member — Wed, 27 Dec 2006 09:51:33 GMT

so how come in OO,

only type is supported and not like?????

Re: like vs type

Sharadha1 — Wed, 27 Dec 2006 09:59:32 GMT

Hi Charles,

Can you just give me an example where you would want to use 'LIKE; in ABAP Objects?

We use only the 'TYPE REF TO' to define abap objects.

Regards,

Sharadha

Re: like vs type

Former Member — Wed, 27 Dec 2006 10:04:56 GMT

eg.

data: matnr like mara-matnr.

Re: like vs type

Sharadha1 — Wed, 27 Dec 2006 10:24:19 GMT

Hi Charles,

You should use "TYPE" to refer ABAP dictionary types and you can use "LIKE" to refer local data objects.

Regards,

Sharadha

Re: like vs type

Former Member — Thu, 28 Dec 2006 09:41:29 GMT

i thought should be the opposite?

use like for data dictionary objects and type for locally declared objects?