DBMS_LOB.SUBSTR with NCLOB data type

Hi ,
When I am trying to extract part of the string from Comments column(NCLOB datatype) am facing issue.
ORA-06502:PL/SQL Numeric or value error :Character string buffer too small
select dbms_lob.substr(a.COMMENTS, 4000, 1),
from VW_DETAILS a
where a.id = 6210872
DBMS_LOB.SUBSTR with NCLOB data type
Table structure :
Column_name Data_type
Comments NCLOB
ID NUMBER
Regards,
Venkat

DBMS_LOB.SUBSTR parameter amount for CLOB/NCLOB indicates number of characters to substring, not bytes. And 4000 multi-byte characters (since you are using NCLOB) is greater than 4000 bytes which is absolute limit for VARCHAR2 in SQL.
SY.

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Problem with bool data type in overloading

Please find the following error.
I did following typedef:
typedef bool Boolean;
typedef signed int Sint32;
Problem description:
This error is occurring because Sun CC 5.9 or Solaris 9 g++ considers bool data type as signed Integer, when passed as an constructor argument. First, it is overloading the constructor with �bool� data type and when it comes the turn of �signed integer� to overload constructor, the compiler is giving an error �cannot be overloaded�. The error �redefinition� is also due to bool data type.
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ERROR in g++:-
( /usr/local/bin/g++ -DSOLARIS_PLATFORM -DUNIX -DPEGASUS_PLATFORM_SOLARIS_SPARC_GNU -DPEGASUS_OS_SOLARIS -DPEGASUS_HAVE_TEMPLATE_SPECIALIZATION -DEXPAND_TEMPLATES -DPEGASUS_USE_EXPERIMENTAL_INTERFACES -Wno-non-template-friend -DTEST_VAI -D__EXTERN_C__ -Dregister= -D_POSIX_PTHREAD_SEMANTICS -Wno-deprecated -DAUTOPASS_DISABLED -DCLUSTER_GEN_APP -DSTAND_ALONE_INTEG -I"/TESTBUILD/p2.08.00/TESTsrc" -I/TESTBUILD/pegasus/src -I"/TESTBUILD/p2.08.00/TESTCommonLib" -O -c -o /TESTBUILD/p2.08.00/TESTobj/TESTBase.o /TESTBUILD/p2.08.00/TESTsrc/TESTBase.cpp );
In file included from /TESTBUILD/pegasus/src/Pegasus/Common/Array.h:74,
from /TESTBUILD/pegasus/src/Pegasus/Common/CIMName.h:40,
from /TESTBUILD/pegasus/src/Pegasus/Client/CIMClient.h:39,
from /TESTBUILD/v2.08.00/TESTsrc/TESTVAIInterface.h:4,
from /TESTBUILD/v2.08.00/TESTsrc/TESTCaVAI.h:24,
from /TESTBUILD/v2.08.00/TESTsrc/TESTBase.h:11,
from /TESTBUILD/v2.08.00/TESTsrc/TESTBase.cpp:1:
/TESTBUILD/pegasus/src/Pegasus/Common/ArrayInter.h:49: error: redefinition of `class Pegasus::Array<Pegasus::Boolean>'
/TESTBUILD/pegasus/src/Pegasus/Common/ArrayInter.h:49: error: previous definition of `class Pegasus::Array<Pegasus::Boolean>'
In file included from /TESTBUILD/pegasus/src/Pegasus/Common/MessageLoader.h:42,
from /TESTBUILD/pegasus/src/Pegasus/Common/Exception.h:44,
from /TESTBUILD/pegasus/src/Pegasus/Common/CIMName.h:41,
from /TESTBUILD/pegasus/src/Pegasus/Client/CIMClient.h:39,
from /TESTBUILD/v2.08.00/TESTsrc/TESTVAIInterface.h:4,
from /TESTBUILD/v2.08.00/TESTsrc/TESTCaVAI.h:24,
from /TESTBUILD/v2.08.00/TESTsrc/TESTBase.h:11,
from /TESTBUILD/v2.08.00/TESTsrc/TESTBase.cpp:1:
/TESTBUILD/pegasus/src/Pegasus/Common/Formatter.h:114: error: `Pegasus::Formatter::Arg::Arg(Pegasus::Sint32)' and `Pegasus::Formatter::Arg::Arg(Pegasus::Boolean)' cannot be overloaded
In file included from /TESTBUILD/pegasus/src/Pegasus/Common/CIMProperty.h:40,
from /TESTBUILD/pegasus/src/Pegasus/Common/CIMObject.h:42,
from /TESTBUILD/pegasus/src/Pegasus/Client/CIMClient.h:41,
from /TESTBUILD/v2.08.00/TESTsrc/TESTVAIInterface.h:4,
from /TESTBUILD/v2.08.00/TESTsrc/TESTCaVAI.h:24,
from /TESTBUILD/v2.08.00/TESTsrc/TESTBase.h:11,
from /TESTBUILD/v2.08.00/TESTsrc/TESTBase.cpp:1:
/TESTBUILD/pegasus/src/Pegasus/Common/CIMValue.h:92: error: `Pegasus::CIMValue::CIMValue(Pegasus::Sint32)' and `Pegasus::CIMValue::CIMValue(Pegasus::Boolean)' cannot be overloaded
/TESTBUILD/pegasus/src/Pegasus/Common/CIMValue.h:147: error: `Pegasus::CIMValue::CIMValue(const Pegasus::Array<Pegasus::Boolean>&)' and `Pegasus::CIMValue::CIMValue(const Pegasus::Array<Pegasus::Boolean>&)' cannot be overloaded
/TESTBUILD/pegasus/src/Pegasus/Common/CIMValue.h:291: error: `void Pegasus::CIMValue::set(Pegasus::Sint32)' and `void Pegasus::CIMValue::set(Pegasus::Boolean)' cannot be overloaded
/TESTBUILD/pegasus/src/Pegasus/Common/CIMValue.h:323: error: `void Pegasus::CIMValue::set(const Pegasus::Array<Pegasus::Boolean>&)' and `void Pegasus::CIMValue::set(const Pegasus::Array<Pegasus::Boolean>&)' cannot be overloaded
/TESTBUILD/pegasus/src/Pegasus/Common/CIMValue.h:377: error: `void Pegasus::CIMValue::get(Pegasus::Sint32&) const' and `void Pegasus::CIMValue::get(Pegasus::Boolean&) const' cannot be overloaded
/TESTBUILD/pegasus/src/Pegasus/Common/CIMValue.h:409: error: `void Pegasus::CIMValue::get(Pegasus::Array<Pegasus::Boolean>&) const' and `void Pegasus::CIMValue::get(Pegasus::Array<Pegasus::Boolean>&) const' cannot be overloaded
*** Error code 1
make: Fatal error: Command failed for target `/TESTBUILD/v2.08.00/TESTsrc/TESTBase.or'
Same ERROR in Sun CC:-
palace /TESTBUILD/p2.08.00/TESTobj-> make -ef Make_SolarisVAICC TESTVAIrun
( /sun-share/SUNWspro/bin/CC -DSOLARIS_PLATFORM -DUNIX -DPEGASUS_PLATFORM_SOLARIS_SPARC_CC -features=bool -DPEGASUS_USE_EXPERIMENTAL_INTERFACES -DTEST_VAI -DEXPAND_TEMPLATES -D__EXTERN_C__ -DPEGASUS_INTERNALONLY -DPEGASUS_OS_SOLARIS -DPEGASUS_USE_EXPERIMENTAL_INTERFACES -DPEGASUS_USE_DEPRECATED_INTERFACES -Dregister= -D_POSIX_PTHREAD_SEMANTICS -DCLUSTER_GEN_APP -DSTAND_ALONE_INTEG -I"/TESTBUILD/v2.08.00/TESTsrc" -I"/Pegasus/pegasus-2.5/src" -I"/TESTBUILD/p2.08.00/TESTCommonLib" -O -c -o /TESTBUILD/p2.08.00/TESTobj/TESTBase.o /TESTBUILD/p2.08.00/TESTsrc/TESTBase.cpp );
"/Pegasus/pegasus-2.5/src/Pegasus/Common/ArrayInter.h", line 47: Error: Multiple declaration for Pegasus::Array<int>.
"/Pegasus/pegasus-2.5/src/Pegasus/Common/Formatter.h", line 103: Error: Multiple declaration for Pegasus::Formatter::Arg::Arg(int).
"/Pegasus/pegasus-2.5/src/Pegasus/Common/CIMValue.h", line 90: Error: Multiple declaration for Pegasus::CIMValue::CIMValue(int).
"/Pegasus/pegasus-2.5/src/Pegasus/Common/CIMValue.h", line 145: Error: Multiple declaration for Pegasus::CIMValue::CIMValue(const Pegasus::Array<int>&).
"/Pegasus/pegasus-2.5/src/Pegasus/Common/CIMValue.h", line 289: Error: Multiple declaration for Pegasus::CIMValue::set(int).
"/Pegasus/pegasus-2.5/src/Pegasus/Common/CIMValue.h", line 321: Error: Multiple declaration for Pegasus::CIMValue::set(const Pegasus::Array<int>&).
"/Pegasus/pegasus-2.5/src/Pegasus/Common/CIMValue.h", line 375: Error: Multiple declaration for Pegasus::CIMValue::get(int&) const.
"/Pegasus/pegasus-2.5/src/Pegasus/Common/CIMValue.h", line 407: Error: Multiple declaration for Pegasus::CIMValue::get(Pegasus::Array<int>&) const.
Thank and Regards,
Dileep

In Sun C++, type bool is not equivalent to signed int. I don't think g++ makes it equivalent either.
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using System.Data;
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using Oracle.DataAccess.Types;
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/// </summary>
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But the application we have that uses the database cannot be changed to read from a CLOBWhy can't you change the application?
Well, anyway you should point out to your superiors that Oracle documented years ago to not use LONGS anymore...
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/datatype.htm#sthref3806
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LONG Datatype
Note:
Do not create tables with LONG columns. Use LOB columns (CLOB, NCLOB) instead. LONG columns are supported only for backward compatibility.
Oracle also recommends that you convert existing LONG columns to LOB columns. LOB columns are subject to far fewer restrictions than LONG columns. Further, LOB functionality is enhanced in every release, whereas LONG functionality has been static for several releases.
How do I go from CLOB to LONG?I'm sorry, cannot help you on that one, I don't think you can do that at all (Oracle wants us to stop using LONGS, so, it's a one-way conversion...):
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1037232794454#15512131314505
So: NO built_in, you'll need to write a program if the clob is ALWAYS LESS THAN 32k in size, you can use plsql..but is that the case in your case? Only you know that.
I believe that question is still unanswered on this forum, but you might try searchin for answers on this forum, and
the 'Database-General' forum: General Database Discussions
Perhaps you can google a Q&D workaround...
( And consider convincing your collegues to just convert your LONGS to LOBS)
Edited by: hoek on Apr 8, 2009 5:43 PM

Oracle 01g and forms 6i with BLOB Data type

Dear All,
I have upgraded my database from oracle 9i R2 to oracle 10g R2. i have an application developed using oracle forms and reports 6i. this application have a form where it stores and retirive an image from the database, this image is stored in a table with a BLOB data type, it was being retrieved fine until we did the upgrade and now it is impossible for me to see the image and i am getting an error every time i retrive the data. it always pop a message saying that "INCONSISTENT DATA TYPE"
please guys help.
Regards

you can try this procedure
DECLARE
t_blob BLOB;
t_len NUMBER;
t_file_name VARCHAR2(100);
t_output UTL_FILE.file_type;
t_TotalSize number;
t_position number := 1;
t_chucklen NUMBER := 4096;
t_chuck raw(4096);
t_remain number;
BEGIN
-- Get length of blob
SELECT DBMS_LOB.getlength (PHOTO), ename || '_1.jpg'
INTO t_TotalSize, t_file_name FROM DEMO WHERE ENAME ='moon';
t_remain := t_TotalSize;
-- The directory TEMPDIR should exist before executing
t_output := UTL_FILE.fopen ('TEMPDIR', t_file_name, 'wb', 32760);
-- Get BLOB
SELECT PHOTO INTO t_blob FROM DEMO WHERE ENAME ='moon';
-- Retrieving BLOB
WHILE t_position < t_TotalSize
LOOP
DBMS_LOB.READ (t_blob, t_chucklen, t_position, t_chuck);
UTL_FILE.put_raw (t_output, t_chuck);
UTL_FILE.fflush (t_output);
t_position := t_position + t_chucklen;
t_remain := t_remain - t_chucklen;
IF t_remain < 4096
THEN
t_chucklen := t_remain;
END IF;
END LOOP;
END;
it will work

DBMS_LOB.SUBSTR with NCLOB data type

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