JDBC Type 4 Driver 2.0 Programmer's Reference (SQL/MX 2.x)

// read Blob data using the InputStream
byte[] myBlobData;
myBlobData = new byte[length];
is.read(myBlobData, offset, length);
Updating BLOB Data
Updating Blob Objects by Using the updateBlob Method
Replacing Blob Objects
To update BLOB data, use the methods in the Blob interface or use the updateBlob method of the
ResultSet interface. The Type 4 driver makes changes to the BLOB data directly. Therefore, the Type
4 driver returns false to the locatorsUpdateCopy method of the DatabaseMetaData
interface. Applications do not need to issue a separate update statement to update the BLOB data.
Update BLOB data in the following ways.
Updating Blob Objects by using the updateBlob Method●
Replacing Blob Objects●
Updating Blob Objects by Using the updateBlob Method
Unlike some LOB support implementations, the Type 4 driver updates the BLOB data directly in the
database. So, when the Blob object is same in the updateBlob method as the object obtained using
getBlob, the updateRow method of the ResultSet interface does nothing with the Blob object.
When the Blob objects differ, the Blob object in the updateBlob method behaves as if the setBlob
method was issued. See Inserting a Blob Object with the setBlob Method.
Replacing Blob Objects
You can replace Blob objects in the following ways:
Use the EMPTY_BLOB() function to replace the Blob object with the empty Blob object.
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Replace an existing Blob object in a row by inserting the Blob with new data as described under
Inserting a BLOB Column Using the Blob Interface.
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Use the setBinaryStream() method to of the PreparedStatement interface to replace
the existing Blob object with new BLOB data.
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Use the setBlob or updateBlob methods to replace the existing BLOB objects as explained
under Inserting a Blob Object with the setBlob Method and Updating Blob Objects with the
UpdateBlob Method.
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