global temporary table --> invalid ROWID?

[Corrine]

Hi,

I am creating a global temporary table that is session-specific. I
insert a BLOB into this table, and then select the BLOB from this
table into a ResultSet. The ResultSet sees this BLOB object, and I am
able to get the binary input stream from this blob. However, when I
invoke InputStream.rea d(byte[]) on this input stream, I get the
following exception:

java.io.IOExcep tion: ORA-01410: invalid ROWID
ORA-06512: at "SYS.DBMS_L OB", line 751
ORA-06512: at line 1
at oracle.jdbc.dba ccess.DBError.S QLToIOException (DBError.java:6 25)

at oracle.jdbc.dri ver.OracleBlobI nputStream.need Bytes(OracleBlo bInputStream.ja va:179)

at oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:113)

at oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:91)
...

Just for clarity, here is basically the code I'm using:

CallableStateme nt cstmt2 = db.prepareCall( "commit");
CallableStateme nt cstmt = db.prepareCall( "create global temporary
table temp_table (blobid NUMBER unique, blob_col BLOB) on commit
preserve rows");
cstmt.execute() ;
cstmt.close();
cstmt2.execute( );
CallableStateme nt cstmt1 = db.prepareCall( "insert into temp_table
values (1, empty_blob())") ;
cstmt1.execute( );
cstmt1.close();
cstmt2.execute( );
cstmt2.close();

CallableStateme nt plsqlblock =
db.prepareCall( stringThatFills InEmptyBlobInTe mpTable);
plsqlblock.exec ute();
plsqlblock.clos e();

PreparedStateme nt pstmt1 = db.prepareState ment("select blob_col from
temp_table where blobid = 1");
ResultSet rset = pstmt1.executeQ uery();
BLOB bl;
if (rset.next())
{
System.out.prin tln("success.") ; //<--- This prints out.
bl = ((OracleResultS et)rset).getBLO B(1);
}
pstmt1.close();

InputStream bis = bl.getBinaryStr eam();
int numBytes = 0;
byte[] theBytes = new byte[appropriateLeng th];
numBytes = bis.read(theByt es); ///*******EXCEPTIO N HAPPENS
HERE!!!!
I would also like to mention that when I change temp_table to be just
a regular table, everything works correctly.

What's the problem, and how do I fix it?

Thanks,

Corrine

[Oracle_Technet]

Reason as per my understanding: java front end would be using
connection pooling, and the session is not bound. so once the back end
proc gives the output back to front end, and then the front end tries
to access the blob stored in the global temp table, it will give
error, as global temp table is session specific. (so rowid not found).
Same type of errors would be encountered with ref cursors based on
global temp tables.
So, don't use Global Temporary tables for returning resultsets to java
front end.
Hope this helps.

Ja***********@v olcanomail.com (Corrine) wrote in message news:<54******* *************** ****@posting.go ogle.com>...

Hi,

I am creating a global temporary table that is session-specific. I
insert a BLOB into this table, and then select the BLOB from this
table into a ResultSet. The ResultSet sees this BLOB object, and I am
able to get the binary input stream from this blob. However, when I
invoke InputStream.rea d(byte[]) on this input stream, I get the
following exception:

java.io.IOExcep tion: ORA-01410: invalid ROWID
ORA-06512: at "SYS.DBMS_L OB", line 751
ORA-06512: at line 1
at oracle.jdbc.dba ccess.DBError.S QLToIOException (DBError.java:6 25)

at oracle.jdbc.dri ver.OracleBlobI nputStream.need Bytes(OracleBlo bInputStream.ja va:179)

at oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:113)

at oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:91)
...

Just for clarity, here is basically the code I'm using:

CallableStateme nt cstmt2 = db.prepareCall( "commit");
CallableStateme nt cstmt = db.prepareCall( "create global temporary
table temp_table (blobid NUMBER unique, blob_col BLOB) on commit
preserve rows");
cstmt.execute() ;
cstmt.close();
cstmt2.execute( );
CallableStateme nt cstmt1 = db.prepareCall( "insert into temp_table
values (1, empty_blob())") ;
cstmt1.execute( );
cstmt1.close();
cstmt2.execute( );
cstmt2.close();

CallableStateme nt plsqlblock =
db.prepareCall( stringThatFills InEmptyBlobInTe mpTable);
plsqlblock.exec ute();
plsqlblock.clos e();

PreparedStateme nt pstmt1 = db.prepareState ment("select blob_col from
temp_table where blobid = 1");
ResultSet rset = pstmt1.executeQ uery();
BLOB bl;
if (rset.next())
{
System.out.prin tln("success.") ; //<--- This prints out.
bl = ((OracleResultS et)rset).getBLO B(1);
}
pstmt1.close();

InputStream bis = bl.getBinaryStr eam();
int numBytes = 0;
byte[] theBytes = new byte[appropriateLeng th];
numBytes = bis.read(theByt es); ///*******EXCEPTIO N HAPPENS
HERE!!!!
I would also like to mention that when I change temp_table to be just
a regular table, everything works correctly.

What's the problem, and how do I fix it?

Thanks,

Corrine

[Jim Kennedy]

"Oracle_Technet " <or************ @yahoo.com> wrote in message
news:c3******** *************** ***@posting.goo gle.com...

Reason as per my understanding: java front end would be using
connection pooling, and the session is not bound. so once the back end
proc gives the output back to front end, and then the front end tries
to access the blob stored in the global temp table, it will give
error, as global temp table is session specific. (so rowid not found).
Same type of errors would be encountered with ref cursors based on
global temp tables.
So, don't use Global Temporary tables for returning resultsets to java
front end.
Hope this helps.

Ja***********@v olcanomail.com (Corrine) wrote in message

news:<54******* *************** ****@posting.go ogle.com>...

Hi,

I am creating a global temporary table that is session-specific. I
insert a BLOB into this table, and then select the BLOB from this
table into a ResultSet. The ResultSet sees this BLOB object, and I am
able to get the binary input stream from this blob. However, when I
invoke InputStream.rea d(byte[]) on this input stream, I get the
following exception:

java.io.IOExcep tion: ORA-01410: invalid ROWID
ORA-06512: at "SYS.DBMS_L OB", line 751
ORA-06512: at line 1
at oracle.jdbc.dba ccess.DBError.S QLToIOException (DBError.java:6 25)

at oracle.jdbc.dri ver.OracleBlobI nputStream.need Bytes(OracleBlo bInputStream.ja v
a:179)
at oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:113)
at oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:91) ...

Just for clarity, here is basically the code I'm using:

CallableStateme nt cstmt2 = db.prepareCall( "commit");
CallableStateme nt cstmt = db.prepareCall( "create global temporary
table temp_table (blobid NUMBER unique, blob_col BLOB) on commit
preserve rows");
cstmt.execute() ;
cstmt.close();
cstmt2.execute( );
CallableStateme nt cstmt1 = db.prepareCall( "insert into temp_table
values (1, empty_blob())") ;
cstmt1.execute( );
cstmt1.close();
cstmt2.execute( );
cstmt2.close();

CallableStateme nt plsqlblock =
db.prepareCall( stringThatFills InEmptyBlobInTe mpTable);
plsqlblock.exec ute();
plsqlblock.clos e();

PreparedStateme nt pstmt1 = db.prepareState ment("select blob_col from
temp_table where blobid = 1");
ResultSet rset = pstmt1.executeQ uery();
BLOB bl;
if (rset.next())
{
System.out.prin tln("success.") ; //<--- This prints out.
bl = ((OracleResultS et)rset).getBLO B(1);
}
pstmt1.close();

InputStream bis = bl.getBinaryStr eam();
int numBytes = 0;
byte[] theBytes = new byte[appropriateLeng th];
numBytes = bis.read(theByt es); ///*******EXCEPTIO N HAPPENS
HERE!!!!
I would also like to mention that when I change temp_table to be just
a regular table, everything works correctly.

What's the problem, and how do I fix it?

Thanks,

Corrine

If it works on a regular table then why are you making things more expensive
by putting it in a temp table first? Just get it out of the regular table.
Jim

[Corrine]

Is a temporary table really more expensive than a regular table?
Actually, I prefer a temporary table, because my application serves
multiple users simultaneously. I am concerned about concurrency
issues that arise if I use
just a regular table.

Speaking of which, what if I use a temporary BLOB rather than a
temporary table? I am trying to do this now, but I can't figure out
how to get the modified BLOB object back to Java after the PLSQL block
has finished executing.

I do:

BLOB bl = BLOB.createTemp orary(db,true,B LOB.DURATION_SE SSION);
CallableStateme nt plsqlblock = conn.prepareCal l(
"declare\n" +
" stuff... \n"+
"begin\n"+
" procThatModifie sBLOB(?);\n"+
"end;\n");
plsqlblock.setB lob(1, bl);
plsqlblock.exec ute();

bl = plsqlblock.getB lob(1); //**** doesn't work.

How do I retrieve the modified value of "bl" after "plsqlblock "
finishes executing?
"Jim Kennedy" <kennedy-down_with_spamm ers@no_spam.com cast.net> wrote in message news:<Pxffb.485 819$Oz4.329946@ rwcrnsc54>...

If it works on a regular table then why are you making things more
expensive

by putting it in a temp table first? Just get it out of the regular table.
Jim "Oracle_Technet " <or************ @yahoo.com> wrote in message
news:c3******** *************** ***@posting.goo gle.com...

Reason as per my understanding: java front end would be using
connection pooling, and the session is not bound. so once the back end
proc gives the output back to front end, and then the front end tries
to access the blob stored in the global temp table, it will give
error, as global temp table is session specific. (so rowid not found).
Same type of errors would be encountered with ref cursors based on
global temp tables.
So, don't use Global Temporary tables for returning resultsets to java
front end.
Hope this helps.

Ja***********@v olcanomail.com (Corrine) wrote in message

news:<54******* *************** ****@posting.go ogle.com>...

Hi,

I am creating a global temporary table that is session-specific. I
insert a BLOB into this table, and then select the BLOB from this
table into a ResultSet. The ResultSet sees this BLOB object, and I am
able to get the binary input stream from this blob. However, when I
invoke InputStream.rea d(byte[]) on this input stream, I get the
following exception:

java.io.IOExcep tion: ORA-01410: invalid ROWID
ORA-06512: at "SYS.DBMS_L OB", line 751
ORA-06512: at line 1
at oracle.jdbc.dba ccess.DBError.S QLToIOException (DBError.java:6 25)

at oracle.jdbc.dri ver.OracleBlobI nputStream.need Bytes(OracleBlo bInputStream.ja v
a:179)
at oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:113)
at oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:91) ...

Just for clarity, here is basically the code I'm using:

CallableStateme nt cstmt2 = db.prepareCall( "commit");
CallableStateme nt cstmt = db.prepareCall( "create global temporary
table temp_table (blobid NUMBER unique, blob_col BLOB) on commit
preserve rows");
cstmt.execute() ;
cstmt.close();
cstmt2.execute( );
CallableStateme nt cstmt1 = db.prepareCall( "insert into temp_table
values (1, empty_blob())") ;
cstmt1.execute( );
cstmt1.close();
cstmt2.execute( );
cstmt2.close();

CallableStateme nt plsqlblock =
db.prepareCall( stringThatFills InEmptyBlobInTe mpTable);
plsqlblock.exec ute();
plsqlblock.clos e();

PreparedStateme nt pstmt1 = db.prepareState ment("select blob_col from
temp_table where blobid = 1");
ResultSet rset = pstmt1.executeQ uery();
BLOB bl;
if (rset.next())
{
System.out.prin tln("success.") ; //<--- This prints out.
bl = ((OracleResultS et)rset).getBLO B(1);
}
pstmt1.close();

InputStream bis = bl.getBinaryStr eam();
int numBytes = 0;
byte[] theBytes = new byte[appropriateLeng th];
numBytes = bis.read(theByt es); ///*******EXCEPTIO N HAPPENS
HERE!!!!
I would also like to mention that when I change temp_table to be just
a regular table, everything works correctly.

What's the problem, and how do I fix it?

Thanks,

Corrine

[Jim Kennedy]

"Corrine" <Ja***********@ volcanomail.com > wrote in message
news:54******** *************** ***@posting.goo gle.com...

Is a temporary table really more expensive than a regular table?
Actually, I prefer a temporary table, because my application serves
multiple users simultaneously. I am concerned about concurrency
issues that arise if I use
just a regular table.

Speaking of which, what if I use a temporary BLOB rather than a
temporary table? I am trying to do this now, but I can't figure out
how to get the modified BLOB object back to Java after the PLSQL block
has finished executing.

I do:

BLOB bl = BLOB.createTemp orary(db,true,B LOB.DURATION_SE SSION);
CallableStateme nt plsqlblock = conn.prepareCal l(
"declare\n" +
" stuff... \n"+
"begin\n"+
" procThatModifie sBLOB(?);\n"+
"end;\n");
plsqlblock.setB lob(1, bl);
plsqlblock.exec ute();

bl = plsqlblock.getB lob(1); //**** doesn't work.

How do I retrieve the modified value of "bl" after "plsqlblock "
finishes executing?
"Jim Kennedy" <kennedy-down_with_spamm ers@no_spam.com cast.net> wrote in message news:<Pxffb.485 819$Oz4.329946@ rwcrnsc54>...
If it works on a regular table then why are you making things more
expensive

by putting it in a temp table first? Just get it out of the regular table.

Jim

"Oracle_Technet " <or************ @yahoo.com> wrote in message
news:c3******** *************** ***@posting.goo gle.com...

Reason as per my understanding: java front end would be using
connection pooling, and the session is not bound. so once the back end
proc gives the output back to front end, and then the front end tries
to access the blob stored in the global temp table, it will give
error, as global temp table is session specific. (so rowid not found).
Same type of errors would be encountered with ref cursors based on
global temp tables.
So, don't use Global Temporary tables for returning resultsets to java
front end.
Hope this helps.

Ja***********@v olcanomail.com (Corrine) wrote in message

news:<54******* *************** ****@posting.go ogle.com>...

> Hi,
>
> I am creating a global temporary table that is session-specific. I
> insert a BLOB into this table, and then select the BLOB from this
> table into a ResultSet. The ResultSet sees this BLOB object, and I am > able to get the binary input stream from this blob. However, when I
> invoke InputStream.rea d(byte[]) on this input stream, I get the
> following exception:
>
> java.io.IOExcep tion: ORA-01410: invalid ROWID
> ORA-06512: at "SYS.DBMS_L OB", line 751
> ORA-06512: at line 1
>
>
> at oracle.jdbc.dba ccess.DBError.S QLToIOException (DBError.java:6 25)
>
> at

oracle.jdbc.dri ver.OracleBlobI nputStream.need Bytes(OracleBlo bInputStream.ja v a:179)

>
> at

oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:113)

>
> at

oracle.jdbc.dri ver.OracleBuffe redStream.read( OracleBufferedS tream.java:91)

> ...
>
> Just for clarity, here is basically the code I'm using:
>
> CallableStateme nt cstmt2 = db.prepareCall( "commit");
> CallableStateme nt cstmt = db.prepareCall( "create global temporary > table temp_table (blobid NUMBER unique, blob_col BLOB) on commit
> preserve rows");
> cstmt.execute() ;
> cstmt.close();
> cstmt2.execute( );
> CallableStateme nt cstmt1 = db.prepareCall( "insert into temp_table > values (1, empty_blob())") ;
> cstmt1.execute( );
> cstmt1.close();
> cstmt2.execute( );
> cstmt2.close();
>
> CallableStateme nt plsqlblock =
> db.prepareCall( stringThatFills InEmptyBlobInTe mpTable);
> plsqlblock.exec ute();
> plsqlblock.clos e();
>
> PreparedStateme nt pstmt1 = db.prepareState ment("select blob_col from > temp_table where blobid = 1");
> ResultSet rset = pstmt1.executeQ uery();
> BLOB bl;
> if (rset.next())
> {
> System.out.prin tln("success.") ; //<--- This prints out.
> bl = ((OracleResultS et)rset).getBLO B(1);
> }
> pstmt1.close();
>
> InputStream bis = bl.getBinaryStr eam();
> int numBytes = 0;
> byte[] theBytes = new byte[appropriateLeng th];
> numBytes = bis.read(theByt es); ///*******EXCEPTIO N HAPPENS
> HERE!!!!
>
>
> I would also like to mention that when I change temp_table to be just > a regular table, everything works correctly.
>
> What's the problem, and how do I fix it?
>
> Thanks,
>
> Corrine

You don't need a temporary table. In Oracle readers don't block readers or
writers and writers don't block readers. This type of programming is often
seen in SQLServer because of the lack of concurrency. Using a regular table
you will not see concurrency issues in Oracle.
Jim