Oracle® Database SQL Reference 10g Release 2 (10.2) Part Number B14200-01 |
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Syntax
Purpose
DUMP
returns a VARCHAR2
value containing the datatype code, length in bytes, and internal representation of expr
. The returned result is always in the database character set. For the datatype corresponding to each code, see Table 2-2, "Storage of Scale and Precision".
The argument return_fmt
specifies the format of the return value and can have any of the following values:
8 returns result in octal notation.
10 returns result in decimal notation.
16 returns result in hexadecimal notation.
17 returns result as single characters.
By default, the return value contains no character set information. To retrieve the character set name of expr
, add 1000 to any of the preceding format values. For example, a return_fmt
of 1008 returns the result in octal and provides the character set name of expr
.
The arguments start_position
and length
combine to determine which portion of the internal representation to return. The default is to return the entire internal representation in decimal notation.
If expr
is null, then this function returns NULL
.
This function does not support CLOB
data directly. However, CLOB
s can be passed in as arguments through implicit data conversion.
Examples
The following examples show how to extract dump information from a string expression and a column:
SELECT DUMP('abc', 1016) FROM DUAL; DUMP('ABC',1016) ------------------------------------------ Typ=96 Len=3 CharacterSet=WE8DEC: 61,62,63
SELECT DUMP(last_name, 8, 3, 2) "OCTAL" FROM employees WHERE last_name = 'Hunold'; OCTAL ------------------------------------------------------------------- Typ=1 Len=6: 156,157 SELECT DUMP(last_name, 10, 3, 2) "ASCII" FROM employees WHERE last_name = 'Hunold'; ASCII -------------------------------------------------------------------- Typ=1 Len=6: 110,111