BLOB JDBC/OCI8 and dbms_lob.read

Hi,
using dbms_lob.read() to retrieve a BLOB with JDBC/OCI8
we cannot use a chunk larger than 255.
If we try, we get a 21560 error.
Any idea?
Thanks
Herve
null

Thanks for your quick answer.
I tried it, but doing so, it doubles those characters coming from RAW format to VARCHAR2, and I've got a PNG-file that no picture-viewer shows, not even as garbage as was with CAST_TO_VARCHAR
file size is now 44246 bytes and debug-output from loop is:
chunk no:1 chunk size: 8192 chunksize in bytes: 8192
chunk no:2 chunk size: 8192 chunksize in bytes: 8192
chunk no:3 chunk size: 8192 chunksize in bytes: 8192
chunk no:4 chunk size: 8192 chunksize in bytes: 8192
chunk no:5 chunk size: 8192 chunksize in bytes: 8192
chunk no:6 chunk size: 3286 chunksize in bytes: 3286
whole chunk-size: 44246 in bytes: 44246
Anymore ideas?

Similar Messages

Jdbc (oci8) and database link ?

hello,
i try to select * from dual@DBNAME within a jdbc connection.
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2. then we prepare a statement
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hello,
i try to select * from dual@DBNAME within a jdbc connection.
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DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
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Jdbc/oci8 oracore8.dll problem

Hi,
I am using jdbc oci8 and facing the following problem.
Server: Oracle 8.1.6.0.0 on Solaris
JDK : JDK 1.2
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Hello Experts,
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Any help is greatly appreciated.

BluShadow,
Thanks for your response. The reason that it is a blob is that we use the same table for uploaded files for several applications. Some files are text, some excel, some other formats. Hence the table has been set up in a generic sense.
However, in my procedure, I'm using
DBMS_LOB.createtemporary and
DBMS_LOB.converttoclob
Is there any way you could possibly provide an example of how to read the contents of the file?

Read blob 's data and write them to a table

I've managed at last to upload a blob to a table database (thanks to KUBA's)
Now I want to retrieve the blob from the database table , read it's contents and insert them to a new table. I want to do this after the upload process finishes...
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Hi user571628. A couple of days ago I was working on the same thing, I couldn't finish the app. 'cause I was assigned to do other web app., I used the same example as you to upload the image to the DB and someone called "gnewtonaus" came up with what appears to be an excellent idea to do it, you have to use something called PL/SQL web toolkit (I have never used it and don't know how it works)... but this is what you have to do:
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E.g to display an image (from the DB) on an HTML page you just use

-- Display a photo from the database
procedure display_photo(i_person_id in varchar2) is
v_blob blob;
begin
-- retrieve blob from database
select image into v_blob from pho_photos where person_id = i_person_id;
-- set http headers
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exception
when others then
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Message was edited by:
gnewtonaus
If you get it running please post how you did it, bacause I'll have to come back and do it myself.
Regards

Need help in using dbms_lob.read

I need to upload a file into an Oracle table into a Blob column. The file name along with the file contents are all in one BLOB column.
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File being uploaded is a *.CSV* file.
E.g. Of the .CSV file is: ABC.csv file and its contents will look like:
1,Hello,Nisha
2,Hi,Ravi
3,Bye, Rahul
Etc…..
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Final Staging table should look like:
Record Number Greet Name
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2 Hi Ravi
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Nisha,
Check this example (test) and see if it can be any help. I have utl_file and sqlldr
First Method -- I loaded alert.log successfully and you can imagine how big this file can be (5MB in my test case)
create table t1clob
( clob_text clob);
CREATE OR REPLACE DIRECTORY DIR AS '/path_to_csv_file/;
DECLARE
   clob_data   CLOB;
   clob_file   BFILE;
BEGIN
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END;Second Method: Use of Sqlldr
Example of controlfile
LOAD DATA
INFILE alert.log "STR '|\n'"
REPLACE INTO table t1clob
   clob_text char(30000000)
)Hope this helps.

Oracle 10.1.0 jdbc driver and 9i Database

Are there any known issues with using the Oracle 10.1.0 jdbc drivers and 9i Database. I was lead to believe that the Jdbc drivers are backward compatible.
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Sorry for not including my error:
Hello all,
I am getting an error "Bigger type length than Maximum" when calling a stored procedure that returns a small result set. I am not working with BLOBs or CLOBs and cannot find anything on the web that addresses my specific situation.
I would greatly appreciate any help available in solving this problem.
Here is my data access object:
package my.app.access;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import oracle.jdbc.OracleTypes;
import oracle.jdbc.OracleTypes.*;
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import my.app.util.Database;
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package my.app.access;
import my.app.beans.*;
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     * @param args
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java.sql.SQLException: Bigger type length than Maximum
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     at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:787)
     at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:704)
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what's the OS of the db server? is this code an anonymous pl/sql block, or stored pl/sql? does it run on the server or a client? if it's on the client, what's the o/s of the client?
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https://metalink.oracle.com/metalink/plsql/f?p=130:14:3038746456038321058::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,264157.1,1,1,1,helvetica

Cannot connect using oracle jdbc oci8 driver

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Hi,
Here is the snippet code from oracle,
// You need to import the java.sql package to use JDBC
import java.sql.*;
// We import java.io to be able to read from the command line
import java.io.*;
class JdbcCheckup
public static void main (String args [])
throws SQLException, IOException
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DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
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System.out.println ("Please enter information to test connection to the database");
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String password;
String database;
user = readEntry ("user: ");
int slash_index = user.indexOf ('/');
if (slash_index != -1)
password = user.substring (slash_index + 1);
user = user.substring (0, slash_index);
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password = readEntry ("password: ");
database = readEntry ("database (a TNSNAME entry): ");
System.out.print ("Connecting to the database...");
System.out.flush ();
System.out.println ("Connecting...");
Connection conn =
DriverManager.getConnection ("jdbc:oracle:oci8:@" + database,
user, password);
System.out.println ("connected.");
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rset.close();
// Close the statement
stmt.close();
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conn.close();
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static String readEntry (String prompt)
try
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System.out.print (prompt);
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int c = System.in.read ();
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buffer.append ((char)c);
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OR
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Please enter information to test connection to the database
user: system
password: manager
database (a TNSNAME entry):
Connecting to the database...Connecting...
connected.
Hello World
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Best Luck!
Senthil Babu J

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Hi,
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129
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========================================
What Is New In This Release?
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JDBC for use by Java Stored Procedures or by Java CORBA objects
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tier server.
- JDBC Server-side Internal Driver 8.1.7
Server-side JDBC for use by Java Stored procedures or by Java CORBA
objects running in Oracle 8.1.7. This driver used to be called the
"JDBC Kprb Driver".
For complete documentation, please refer to "JDBC Developer's Guide
and Reference".
Contents Of This Release
The [ORACLE_HOME]/jdbc/lib directory contains:
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Classes for use with JDK 1.1.x. It contains the JDBC driver
classes except classes necessary for NLS support in Object and
Collection types.
- nls_charset11.zip
NLS classes for use with JDK 1.1.x. It contains classes necessary
for NLS support in Object and Collection types.
- classes111_g.zip
Same as classes111.zip, except that classes were compiled with
"javac -g".
- classes12.zip
Classes for use with JDK 1.2.x. It contains the JDBC driver
classes except classes necessary for NLS support in Object and
Collection types.
- nls_charset12.zip
NLS classes for use with JDK 1.2.x. It contains classes necessary
for NLS support in Object and Collection types.
- classes12_g.zip
Same as classes12.zip, except that classes were compiled with
"javac -g".
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changed in 8i. The classes pertaining to specific character sets
support in Object and Collection types have been separated from the
basic zip files. These NLS classes are now packaged into the
extension zip files. This allows the user to include the NLS
classes only if necessary. Please refer to the "NLS Extension Zip
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libocijdbc8_g.so (on Solaris), which are the shared libraries used by
the JDBC OCI driver.
[ORACLE_HOME]/jdbc/doc/javadoc.tar contains the JDBC Javadoc. This
release contains a beta release of the Javadoc files for the public
API of the public classes of Oracle JDBC.
[ORACLE_HOME]/jdbc/demo/demo.tar contains sample JDBC programs.
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Please refer to the "Support For JDK 1.2" for porting details.
NLS Extension Zip Files (for client-side only)
The JDBC Server-side Internal Driver provides complete NLS support.
It does not require any NLS extension zip files, nls_charset*.zip.
Discussions in this section do not apply to the JDBC Server-side
Internal Driver. You can skip this section if you only use the
Server-side Internal Driver.
The basic zip files, classes111.zip and classes12.zip, contain all the
necessary classes to provide complete NLS support for:
- Oracle Character sets for CHAR/VARCHAR/LONGVARCHAR/CLOB type data
that is not retrieved or inserted as a data member of an Oracle 8
Object or Collection type.
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Collections for a few commonly used character sets. These
character sets are: US7ASCII, WE8DEC, WE8ISO8859P1 and UTF8.
Users must include the appropriate extension zip in their CLASSPATH
if utilization of other character sets in CHAR/VARCHAR data members
of Objects/Collections is desired. It is important to note that
extension zip files are large in size due to the requirement of
supporting a large number of character sets. Users may choose to
include only the necessary classes from the extension zip file.
To do so, users can first unzip the extension zip file, and then put
only the necessary classes in the CLASSPATH. The character set
extension class files are named in the following format:
CharacterConverter<OracleCharacterSetId>.class
where <OracleCharacterSetId> is the hexidecimal representation of the
Oracle character set id of the corresponding character set.
Installation
Please do not try to put multiple versions of the Oracle JDBC drivers
in your CLASSPATH. The Oracle installer installs the JDBC Drivers in
the [ORACLE_HOME]/jdbc directory.
Setting Up Your Environment
On Win95/Win98/NT:
- Add [ORACLE_HOME]\jdbc\lib\classes111.zip and
[ORACLE_HOME]\jdbc\lib\nls_charset11.zip to your CLASSPATH.
(Add classes12.zip and nls_charset12.zip if JDK 1.2.x is used.)
- Add [ORACLE_HOME]\jdbc\lib to your PATH.
On Solaris/Digital Unix:
- Add [ORACLE_HOME]/jdbc/lib/classes111.zip and
[ORACLE_HOME]/jdbc/lib/nls_charset11.zip to your CLASSPATH.
(Add classes12.zip and nls_charset12.zip if JDK 1.2.x is used.)
- Add [ORACLE_HOME]/jdbc/lib to your LD_LIBRARY_PATH.
On HP/UX:
- Add [ORACLE_HOME]/jdbc/lib/classes111.zip and
[ORACLE_HOME]/jdbc/lib/nls_charset11.zip to your CLASSPATH.
(Add classes12.zip and nls_charset12.zip if JDK 1.2.x is used.)
- Add [ORACLE_HOME]/jdbc/lib to your SHLIB_PATH and LD_LIBRARY_PATH.
On AIX:
- Add [ORACLE_HOME]/jdbc/lib/classes111.zip and
[ORACLE_HOME]/jdbc/lib/nls_charset11.zip to your CLASSPATH.
(Add classes12.zip and nls_charset12.zip if JDK 1.2.x is used.)
- Add [ORACLE_HOME]/jdbc/lib to your LIBPATH and LD_LIBRARY_PATH.
Some Useful Hints In Using the JDBC Drivers
Please refer to "JDBC Developer's Guide and Reference" for details
regarding usage of Oracle's JDBC Drivers. This section only offers
useful hints. These hints are not meant to be exhaustive.
These are a few simple things that you should do in your JDBC program:
1. Import the necessary JDBC classes in your programs that use JDBC.
For example:
import java.sql.*;
import java.math.*;
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(This is not needed if you are using the JDBC Server-side Internal
Driver because registration is done automatically in the server.)
To register the Oracle driver, make sure the following statement
is executed at least once in your Java session:
DriverManager.registerDriver(
new oracle.jdbc.driver.OracleDriver());
3. Open a connection to the database with the getConnection call.
Different connection URLs should be used for different JDBC
drivers. The following examples demonstrate the different URLs.
For the JDBC OCI8 Driver:
Connection conn = DriverManager.getConnection(
"jdbc:oracle:oci8:@<database>",
"scott", "tiger");
where <database> is either an entry in tnsnames.ora or a SQL*net
name-value pair.
For the JDBC Thin Driver, or Server-side Thin Driver:
Connection conn = DriverManager.getConnection(
"jdbc:oracle:thin:@<database>",
"scott", "tiger");
where <database> is either a string of the form
<host>:<port>:<sid> or a SQL*net name-value pair.
For the JDBC Server-side Internal Driver:
Connection conn = DriverManager.getConnection(
"jdbc:oracle:kprb:");
Note that the trailing ':' character is necessary. When you use
the Server-side Internal Driver, you always connect to the
database you are executing in. You can also do this:
Connection conn
= new oracle.jdbc.driver.OracleDriver().defaultConnection();
Java Stored Procedures
Please note that examples for callins and instance methods using Oracle
8 Object Types are provided in:
[ORACLE_HOME]/javavm/demo/demo.zip
Once unzipped, the directory containing the examples is:
[ORACLE_HOME]/javavm/demo/examples/jsp
Known Problems/Limitations In This Release
The following is a list of known problems/limitations:
1. There is a limitation regarding the use of stream input for LOB
types. Stream input for LOB types can only be used for 8.1.7
JDBC OCI driver connecting to an 8.1.7 Oracle server. The use of
stream input for LOB types in all other configurations may result
in data corruption. PreparedStatement stream input APIs include:
setBinaryStream(), setAsciiStream(), setUnicodeStream(),
setCharacterStream() and setObject().
2. BUG-1018797
Extra characters may be appended to the end of a CLOB value
mistakenly under the following conditions:
- setCharacterStream() is used to insert a CLOB value, and
- The Oracle server uses multi-byte character set.
(See 1 for limitation of stream input for LOB type.)
3. Programs can fail to open 16 or more connections using our
client-side drivers at any one time. This is not a limitation
caused by the JDBC drivers. It is most likely that the limit of
per-process file descriptors is exceeded. The solution is to
increase the limit.
4. The Server-side Internal Driver has the following limitation:
- Data access for LONG and LONG RAW types is limited to 32K of
data.
- Inserts of Object Types (Oracle 8 Objects, Collections and
References) will not work when the database compatibility mode
is set to 8.0. This limitation does not apply when the
compatibility mode is set to 8.1.
- Statement.cancel() is not implemented.
- In a chain of SQLExceptions, only the first one in the chain
will have a getSQLState value.
5. The JDBC OCI driver on an SSL connection hangs when the Java
Virtual Machine is running in green threads mode. A work-around
is to run the Java Virtual Machine in native threads mode.
6. Date-time format, currency symbol and decimal symbols are always
presented in American convention.
7. When using OracleStatement.defineColumnType(), it is not necessary
to define the column type to be the same as the column type
declared in the database. If the types are different, the
retrieved values are converted to the type specified in
defineColumnType.
Note: Most reasonable conversions work, but not all. If you find
a conversion that you think is reasonable, but that does not wo rk,
please submit a TAR to Oracle Support.
8. The utility dbms_java.set_output or dbms_java.set_stream that is
used for redirecting the System.out.println() in JSPs to stdout
SHOULD NOT be used when JDBC tracing is turned on. This is
because the current implementation of dbms_java.set_output and
set_stream uses JDBC to write the output to stdout. The result
would be an infinite loop.
9. The JDBC OCI and Thin drivers do not read CHAR data via binary
streams correctly. In other word, using getBinaryStream() to
retrieve CHAR data may yield incorrect results. A work-around is
to use either getCHAR() or getAsciiStream() instead. The other
alternative is to use getUnicodeStream() although the method is
deprecated.
10. BUG-899078 (since 8.1.6 SDK):
The JDBC Server-side Internal driver has extra space padding with
PL/SQL CHAR OUT (2 to 3 space depending on character set).
Problem occurs in most of the multibyte database character set
except UTF8.
11. There is a limitation for Triggers implemented in Java and Object
Types. It only affects the IN argument types of triggers
implemented using Java on the client-side. The restriction does
not apply to JDBC programs running inside the server. Triggers
implemented as Java methods cannot have IN arguments of Oracle 8
Object or Collection type. This means the Java methods used to
implement triggers cannot have arguments of the following types:
- java.sql.Struct
- java.sql.Array
- oracle.sql.STRUCT
- oracle.sql.ARRAY
- oracle.jdbc2.Struct
- oracle.jdbc2.Array
- any class implementing oracle.jdbc2.SQLData or
oracle.sql.CustomDatum
12. The scrollable result set implementation has the following
limitation:
- setFetchDirection() on ScrollableResultSet is not supported.
- refreshRow() on ScrollableResultSet does not support all
combinations of sensitivity and concurrency. The following
table depicts the supported combinations.
Support Type Concurrency
no TYPE_FORWARD_ONLY CONCUR_READ_ONLY
no TYPE_FORWARD_ONLY CONCUR_UPDATABLE
no TYPE_SCROLL_INSENSITIVE CONCUR_READ_ONLY
yes TYPE_SCROLL_INSENSITIVE CONCUR_UPDATABLE
yes TYPE_SCROLL_SENSITIVE CONCUR_READ_ONLY
yes TYPE_SCROLL_SENSITIVE CONCUR_UPDATABLE
13. BUG-1324918
Repeatedly updating a clob with jdbc-oci, prepared statement,
and setCharacterStream consumes the temporary tablespace. If
you repeatedly update the clob, either the temp tablespace will
continue to grow, or you may get a Exception in thread "main"
java.sql.SQLException: ORA-01652: unable to extend segment if
you have a limit on the tablespace size. The work-around is to
use oracle.sql.CLOB::setCharacterOutputStream() instead.

10g, Windows, UNC and DBMS_LOB

G'day all,
Scenario:
Node A = Oracle 10g (Personal) / Windows 2003
Nodes B,C,D = 3 x Windows 2003 machine
From an architecture perspective and to minimize unnecessary file copies (its unfeasible to initially place the files directly into Node A's filesystem) so currently I have need of PL/SQL data access to B's, C's, D's shared files.
A quick search through AskTom and I
i) made a service account called "Oracle" on all machines with same password (There is no domain, they are development machines in a local workgroup)
ii) Changed the owner of the OracleService[s] on Node A to "Oracle".
iii) Created public shares from Nodes B, C and D and populated them with files
iv) Logged in interactively as "Oracle" on Node A and confirmed that BOTH \\<SERVER>\SHARE (Universal Naming Convention) and mapped drive letters ( X:, Y: and Z: ) both worked for read-write access to shared files.
[Asktom's example mentioned domain accounts but I have confirmed account access without password across the workgroup]
And here I struck FRUSTRATION....
From PL/SQL through granted oracle directories....
No use of mapped drive labels works at all... even when services are started manually from logged in "Oracle" user. DBMS_LOB.GETLENGTH and FILEEXISTS fail miserably contending that Z:<anything> or Z:\<anything> doesn't exist. Not actually a surprise - Microsoft says mapped drives don't reliably work for services due to mappings being saved under a user's context.
However, use of UNC labels work partially
DBMS_LOB.GETLENGTH and FILEEXISTS both work... (huh?)
but OPEN or FILEOPEN both fail with ORA-22288.
[So in PL/SQL land, the file is valid, the file exists, the file has length, but you can't read it.....].
Looked on Metalink to find a note stating that since 9.2 Oracle has restricted UNC paths with DBMS_LOB, citing a mysterious unreferenced security hole. [A sys/system account has to create and grant access to directory objects and BFILEs are read only but anyway....moving on...]
Unfortunately Microsoft says that UNC is the ONLY method a service (which oracle runs as) may use to gain access to network shared files for the reasons stated above, mapped drives are not (necessarily) global.
Elsewhere on Metalink / OTN I have seen references to Oracle supporting different methods (even different syntaxes) of using UNC paths for different purposes... (archive logs, control files etc).
Further weirdnesses....UTL_FILE seems to work correctly and Java source with appropriate privileges can definitely see the files (via the UNC paths) - so why the asymmetry between UTL_FILE, Java and BFILEs?
[Not very "grid" like is it? Seemingly an arbitrarily restriction on the use of an existent OPERATING SYSTEM virtualisation method].
Ok, how about a solution - Is there an event that I can use to suppress the new security checking? (Assuming that is the cause of this issue).
In the meantime, I will be coding up a PL/SQL UTL_FILE.GET_RAW or Java to temp BLOB loader but I was curious to see if anyone else had
i) A solution for the problem.
ii) An explanation for the situation.
Thanks muchly,
Lachlan

I've written rough replacements for dbms_lob.fragment_delete and dbms_lob.fragment_insert. Be glad for any advise.
procedure clob_fragment_delete(l_clob in out clob, l_amount in integer, l_offset in integer)
is
l_len integer := dbms_lob.getlength(l_clob);
begin
dbms_lob.copy(l_clob, l_clob, l_len - l_offset - l_amount, l_offset, l_offset + l_amount);
dbms_lob.trim(l_clob, l_len - l_amount);
end;
procedure clob_fragment_insert(l_clob in out clob, l_amount in integer, l_offset in integer,
l_buffer in varchar2 character set l_clob%charset)
is
l_len integer := dbms_lob.getlength(l_clob);
begin
dbms_lob.copy(l_clob, l_clob, l_len - l_offset, l_offset + l_amount, l_offset);
dbms_lob.write(l_clob, l_amount, l_offset, l_buffer);
end;

Oci8 and oracle thin

I am using developer 3.0 on the NT server machine, with oracle 8
First of all when i start my computer one error message raise that is "one of your service is not running please check the event log". I saw the event log that service is oraclestartorc1. who can i start this service. the other oraclelistener service is also give error message in starting.
so next thing is when i click on the connection UI to make a new connection. I click on the oracle oci8 and use localhost = 127.0.0.1 and protocol = TCP and SID = orcl then error message comes that "ocijdbc8 is not in share path" who can i remove this problem also. I also use BEQ protocol to connect but the error message is same. When i use oracle thin driver then it raise message "could not establish the connection with adapter". Who can i remove this also. when i use the jdbc-odbc bridge it success the connection in test. But it does not show in connection. Who can i get driver for oci8, oci7 or for thin. Simply i want to connect my computer local database. my oracle directory is "orant" please help me thanks..
null

Jawada,
Try the following:
1. Make sure your ORACLE_HOME directory is in your PATH (JDeveloper needs this so it can find the OCI driver's client-side DLL).
2. Make sure you have an alias set up for your database in your TNSNAMES.ORA file (usually located in ORACLE_HOME\network\admin). I believe previous posts to your other questions provided instructions for this.
3. Within JDeveloper, select Tools | IDE Options... from the menu. Choose the Environment Tab, and in the Oracle Home section, choose the name of your Oracle Home or choose Default Home from the Select an Oracle Home list. (this isn't really required unless you have multiple Oracle Home's installed on your machine).
4. When creating your connection within JDeveloper:
a. Choose Oracle JDBC OCI-8 from the Select a JDBC Driver list.
b. Choose Existing TNS Names from the Select a Connection Method list.
c. Choose the alias for your database from the TNS Service list (this list will not appear until you choose Existing TNS Names from the Connection Method list.
null

Error while executing JDBC receiver and sender CC

Hi,
Iam trying to RFC to JDBC scenario.
when i do e2e testing iam facing error as "Configuration error: com.sap.aii.af.service.util.configuration.MandatoryParameterMissingException: Value missing for mandatory configuration attribute tableEOColumnNameId" in CC monitoring and "error reading SAP_XIAdapterFramework from SLD" in SXMB Moni.
Also while performing JDBC to RFC iam facing errror as
"Error during database connection to the database URL 'jdbc:sqlserver://20.198.16.115\SQLSERVER2005:14330;databaseName=SAPHRDataStore' using the JDBC driver 'com.microsoft.sqlserver.jdbc.SQLServerDriver': 'com.sap.aii.adapter.jdbc.sql.DriverManagerException: Cannot establish connection to URL 'jdbc:sqlserver://20.198.16.115\SQLSERVER2005:14330;databaseName=SAPHRDataStore': SAPClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver'"
Please help me in this regard.
Regards
Madhu

It should be com.microsoft.jdbc.sqlserver.SQLServerDriver
I think you have it as com.microsoft.sqlserver.jdbc.SQLServerDriver
Thanks
Praveen M

DBMS_LOB.READ + ORA-06502

Hello,
I have the following function to convert a CLOB to a BLOB.
function Clob_2_Blob (I_CLOB IN CLOB)
return blob
is
v_rst BLOB := empty_blob();
v_clob_length BINARY_INTEGER;
v_blob BLOB := empty_blob();
-- Param pour lire le CLOB.
v_buffer VARCHAR2(32767);
v_amount BINARY_INTEGER := 32767;
v_position INTEGER := 1;
BEGIN
dbms_lob.createtemporary(v_rst,TRUE);
v_clob_length := DBMS_LOB.GETLENGTH(I_CLOB);
LOOP
EXIT WHEN v_position > v_clob_length;
dbms_lob.READ (I_CLOB, v_amount, v_position, v_buffer);
v_blob := utl_raw.cast_to_raw(v_buffer);
dbms_lob.append(v_rst,v_blob);
v_position := v_position + v_amount;
END LOOP;
return v_rst;
end Clob_2_Blob;
When I use it, I get a ORA-06502 exception.
If I change v_amount as follow
v_amount BINARY_INTEGER := 32766;
then I don't get any exception.
I don't understand this because in theory, I can get up to 32767.
What's wrong ?

Hi Peter,
It worked after i split the v_read_count to half. It means
v_read_cnt := 16383;The issue is when reading a character from the database it can get 'expanded' into two bytes. The chunk buffer can hold 32767 characters so if you read 16383 multi-byte characters from the database, it takes up twice the room (the 32766, one left over from rounding).
Thanks

BLOB JDBC/OCI8 and dbms_lob.read

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