Data in RAW format? no conversion...

Hi guys,.

I don't know if this is the right place to ask, but I got most of my knowledge here so I decided to ask here.

I'm reading the data in raw format and I was told that the difference between raw and varchar2 data type is that, during migration, oracle will not manage the data raw data type conversion.

so my question, what is raw? and how is believed raw?
-does this mean that, if I declare my datatype as raw, regardless of the data in this column will not be handle by oracle.

nls_lang sense will be ignored?

example,
on my computer, I am using the acsii7 character set / keyboard with nls_lang value ascii7 or equivalent. On oracle, it uses a set of characters al32utf8.

that means if I declare a column as raw, some person I come into this column, it will be ascii7 encoding/model.

gross means that? It is always say raw storing data in pure binary form... but not all data stored in binary as well? I do not seem to grasp the idea.

all advice please
gurus,

Kind regards
noob

Interpretation means that Oracle can do some specific data type operations. For VARCHAR2, this would mean NLS_UPPER, NLS_LOWER, INSTR, SUBSTR, REGEXP, linguistic sorting, character set conversion, TRANSLATE, etc. For MANY, that means addition, subtraction, rounding, etc..

For RAW, LONG RAW, BLOB, Oracle assumes nothing about the default content. The content can be text, image, executable file, whatever it is representable in bytes. Oracle generally allows BULLIES to be stored and retrieved values. You can also sort on these values.

As it is has no RAW literals, Oracle also defines a text<->conversion RAW through HEXTORAW and RAWTOHEX functions. This conversion is implicitly applied if you specify a value of text where the FIRST is planned, for example in INSERT INTO tab (raw_column) VALUES ('literal text"). This conversion treats text as hexadecimal notation for RAW literals. In other words, the string 'abcd' is converted to a two bytes {0xab, 0xcd} RAW values, not to a four byte value {0 61 0 x 0, 62 x 63 x, 0 x 64}. If the string literal contains a character that is not a hexadecimal digit, ORA-01465 is reported.

Certain operations more on raw are possible when using the integrated package of PL/SQL UTL_RAW. This package allows a developer to applications perform processing on RAW values similar to what is possible for VARCHAR2.

The UTL_RAW function. CAST_TO_RAW allows to cast a VARCHAR2 value RAW in the way you think. The text buffer is labeled as RAW and returned. becomes "abcd" {0x61, 0 x 62, 63 0 x, 0 x 64} on a platform of ASCII and {0x81, 0 x 82, 83 0 x, 0 x 84} on a platform of the EBCDIC.

Then, when I do a select * test, auto oracle will convert the varchar2 raw?

It depends on the data type of the output variable that you define for the RAW column. If the variable is declared in RAW format, the result will be the initial sequence of bytes of the column. If the variable is declared VARCHAR2, the result will be what returns RAWTOHEX, i.e. each byte will be encoded as two-character hexadecimal digits. 0xAB becomes 'AB '.

SQL * always binds a text variable, SELECT raw_column tab returns the readable text of RAWTOHEX hexadecimal representation.

Thnx,
Sergiusz

Tags: Database

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