Blob setBytes and setBinaryStream Clarification Needed

I'm writing a JDBC driver for SQL Server and working on the Blob implementation details.
One thing that is not clear in the JDBC spec to me at least is the behavior of the call to setBytes and to setBinaryStream on a Blob.
Say for a simple example I have a Blob with 5 bytes in it ->
1 2 3 4 5
AA BB CC DD EE
So in the database these 5 bytes are stored. I open a Blob on this field.
Then I call setBytes with offset of 3 and write bytes 11 22 33 44
Do I get this ->
1 2 3 4 5 6
AA BB 11 22 33 44 <- Writes over data, also past end of Blob.
Or this?
1 2 3 4 5
AA BB 11 22 33 <- Writes over data, but not past end of Blob.
Or this?
1 2 3 4 5 6 7 8 9
AA BB 11 22 33 44 CC DD EE <- Inserts data at offset, pushes existing data to right.
So in other words, does setBytes insert data at the insertion point, or start overwriting data at the insertion point? Also, does it allow you to keep writing the data in the backend Blob past the end of the Blob?
Same goes for setBinaryStream. The API spec is not clear about the desired behavior.
Thanks for any clues!
Matt

Well... looking at the API...
public void setBytes(int parameterIndex, byte[] x)
throws SQLExceptionSets the designated parameter to the given Java array of bytes.
The driver converts this to an SQL VARBINARY or LONGVARBINARY
(depending on the argument's size relative to the driver's limits
on VARBINARY values) when it sends it to the database.
public void setBinaryStream(int parameterIndex, InputStream x,int length)
throws SQLExceptionSets the designated parameter to the given input stream, which will
have the specified number of bytes. When a very large binary value
is input to a LONGVARBINARY parameter, it may be more practical to send
it via a java.io.InputStream object. The data will be read from the
stream as needed until end-of-file is reached.
It appears that setBytes() you pass in an entire in-memory array
of bytes, whereas setBinaryStream() allows you to pass in an
InputStream that contains the bytes.

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When to use setBytes() and setBinaryStream()

Hi,
I am using oracle thin driver to insert a image (blob type) into database.
Which method of PreparedStatement interface should I use to insert data,
setBytes() or SetBinaryStream().
My understanding is BinaryStream also sends data in form of bytes.
Then what is the difference between these two method ?
Please let me know.
Thanks,
-Amol

Well... looking at the API...
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Source and destination clarification needed

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2. ONECLNTEBP:
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Hello Deb,
I have not worked on ECC 6.0.
But logically speaking the
source system - has to be yr ECC as SRM would be taking the ref of matl masters from there only
Target system - would be yr same ECC again if you are using only one backend (and I think you are)
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BR
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Oracle.sql.BLOB.setBytes() Error

Hi,
I'm trying to use Java to put a large array of bytes into a BLOB table column. I'm first inserting the new row with an empty_blob() and then calling select <blob_column> ... for update and getting the oracle.sql.BLOB out of the resultset. I then try to call setBytes() on this BLOB and I get the following exception:
java.sql.SQLException: Invalid argument(s) in call: putBytes()
at oracle.jdbc.driver.T4CConnection.putBytes(T4CConnection.java:2440)
at oracle.sql.BLOB.setBytes(BLOB.java:916)
I'm using Oracle XE (oracle-xe-11.2.0-1.0.x86_64.rpm), the latest ojdbc6.jar, and jboss 4.2.2 on CentOS.
A code snippet of what I'm doing:
... stmt = con.prepareStatement("select blob_column from blob_table where id=? for update"); stmt.setLong(1, Id); ResultSet rs = stmt.executeQuery(); try {     if (rs.next()) {         WrappedResultSet wrappedRs = (WrappedResultSet)rs;         BLOB oracleBlob = ((OracleResultSet)wrappedRs.getUnderlyingResultSet()).getBLOB(1);         if(oracleBlob != null) {             byte[] bytes = getData();             int pos = 0;             long bytesLeft = bytes.length;             log.debug("Attempting to write " + bytes.length + " bytes to BLOB");             while(bytesLeft > 0) {                 int bytesWritten = oracleBlob.setBytes(pos, bytes, pos, MAXBUFSIZE);                 log.debug("Wrote " + bytesWritten + " bytes to BLOB");                 bytesLeft -= bytesWritten;                 pos += bytesWritten;             }         }     } } finally {     rs.close(); } ...
Any help would be greatly appreciated!

Welcome to the forum!
Thanks for posting the code and the DB, JDBC and app server versions. Those are what is needed to help.
>
java.sql.SQLException: Invalid argument(s) in call: putBytes()
            while(bytesLeft > 0) {
                int bytesWritten = oracleBlob.setBytes(pos, bytes, pos, MAXBUFSIZE);
                log.debug("Wrote " + bytesWritten + " bytes to BLOB");
                bytesLeft -= bytesWritten;
                pos += bytesWritten;That 'Invalid argument . . .' was your clue to look at the ARGUMENT values you are passing to the method call. You could have easily done that by displaying the values to the console each time in the loop BEFORE the method call.
This is the signature of that method in the Javadocs (edited to highlight the relevant parts):
http://docs.oracle.com/javase/6/docs/api/java/sql/Blob.html#setBytes(long, byte[])
>
int setBytes(long pos, byte[] bytes, int offset, int len) throws SQLException
Writing starts at position pos in the BLOB value; len bytes from the given byte array are written.
Parameters:
pos - the position in the BLOB object at which to start writing; the first position is 1
bytes - the array of bytes to be written to this BLOB object
offset - the offset into the array bytes at which to start reading the bytes to be set
len - the number of bytes to be written to the BLOB value from the array of bytes bytes
>
This is what you are passing for 'len': MAXBUFSIZE
Most likely that value is LARGER than the 'byte array' that you are using; perhaps it is even the MAX int size.
That value is invalid.
In addition each time thru the loop you increment 'pos' and use 'pos' as the 'offset' into your array. Then you once again use MAXBUFSIZE as the number of bytes to write from your array. Even if MAXBUFSIZE is less than the length of your array at some point it will likely be greater than what is left of the array.
For example, if MAXBUFSIZE is 2 and your array length is 3 the first 'put' will put the first two bytes. Then the second put will use a 'pos' of 2 and try to put 2 more bytes; except there is only one byte left.
Your code updates the entire BLOB value. Best practices are to use the stream methods for reading and writing BLOB/CLOB rather than the 'setBytes' method you are using. The main reason for this is performance: the stream methods write DIRECTLY to the database.
>
Notes:
The stream write methods described in this section write directly to the database when you write to the output stream. You do not need to run an UPDATE to write the data. However, you need to call close or flush to ensure all changes are written. CLOBs and BLOBs are transaction controlled. After writing to either, you must commit the transaction for the changes to be permanent.
>
See 'Reading and Writing BLOB and CLOB Data' in the JDBC Dev Guide
http://docs.oracle.com/cd/B19306_01/java.102/b14355/oralob.htm#i1058044
>
Example: Writing BLOB Data
Use the setBinaryOutputStream method of an oracle.sql.BLOB object to write BLOB data.
The following example reads a vector of data into a byte array, then uses the setBinaryOutputStream method to write an array of character data to a BLOB.
java.io.OutputStream outstream;
// read data into a byte array
byte[] data = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
// write the array of binary data to a BLOB
outstream = ((BLOB)my_blob).setBinaryOutputStream(1L);
outstream.write(data);

Java.lang.AbstractMethodError: oracle.sql.BLOB.setBytes

Hi ,
When I deployed an application ( In Oracle 10g )that uses oracleresultset i am getting an error as follows java.lang.AbstractMethodError: oracle.sql.BLOB.setBytes
anybody has a clue ?
Vishnu

Hi Vishnu,
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By me the DB is an 8.1.6 and the JDBC Driver I tried are both the new 10.1 and older ones.
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Blob setBytes and setBinaryStream Clarification Needed

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