Resize a blob column in an Oracle table

I have a table that store pictures from inspections. Occasionally, I will get a 3 or 4 mg file that Oracle Reports will not produce a report because of the size of the photo.
Is there code to resize a blob?

Hi,
Not sure what you mean by "resizing" a blob. You can extract and return a substring of the blob using the dbms_lob supplied package:
SQL> -- get the first 2000 bytes
SQL> select dbms_lob.substr(<blob_column>,2000,1) from <blob_table>;but given the nature of your data, I highly suspect that would be of any use to Oracle Reports or any frontend for that matter.
If by "resizing" a blob, you mean "change the resolution of the pic (blob), on the fly, so that it occupies less space", then I doubt it would be easy to implement using SQL or even PL/SQL.
Just a thought - you may want to program the image resizing logic in a language like Java or C and implement it as a Java Stored Procedure or call it as an external procedure respectively.
pratz

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Pratik.L wrote:
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Sir:
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http://www.ddbcinc.com/askDDBC

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null

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WLS 10.3.5, JDK 1.6u29, Oracle 11g RAC, ojdbc6 latest driver
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+     java.net.SocketInputStream.socketRead0(Native Method)+
+     java.net.SocketInputStream.read(SocketInputStream.java:129)+
+     oracle.net.ns.Packet.receive(Packet.java:300)+
+     oracle.net.ns.DataPacket.receive(DataPacket.java:106)+
+     oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:315)+
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+     oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:105)+
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+     oracle.jdbc.driver.T4C8TTILobd.unmarshalLobData(T4C8TTILobd.java:476)+
+     oracle.jdbc.driver.T4C8TTILob.readLOBD(T4C8TTILob.java:770)+
+     oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:361)+
+     oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)+
+     oracle.jdbc.driver.T4C8TTILob.read(T4C8TTILob.java:146)+
+     oracle.jdbc.driver.T4CConnection.getBytes(T4CConnection.java:2392)+
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+     oracle.sql.BLOB.getBytes(BLOB.java:222)+
+     weblogic.jdbc.wrapper.Blob_oracle_sql_BLOB.getBytes(Unknown Source)+
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+     com.ibatis.sqlmap.engine.type.CustomTypeHandler.getResult(CustomTypeHandler.java:52)+
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+     com.ibatis.sqlmap.engine.execution.SqlExecutor.handleMultipleResults(SqlExecutor.java:300)+
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+     com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118)+
+     com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:94)+
+     com.ibatis.dao.client.template.SqlMapDaoTemplate.queryForList(SqlMapDaoTemplate.java:282)"[STUCK] ExecuteThread: '3' for queue: 'weblogic.kernel.Default (self-tuning)'" RUNNABLE native+
+     java.net.SocketInputStream.socketRead0(Native Method)+
+     java.net.SocketInputStream.read(SocketInputStream.java:129)+
+     oracle.net.ns.Packet.receive(Packet.java:300)+
+     oracle.net.ns.DataPacket.receive(DataPacket.java:106)+
+     oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:315)+
+     oracle.net.ns.NetInputStream.read(NetInputStream.java:260)+
+     oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:105)+
+     oracle.jdbc.driver.T4CMAREngine.getNBytes(T4CMAREngine.java:1517)+
+     oracle.jdbc.driver.T4C8TTILobd.unmarshalLobData(T4C8TTILobd.java:476)+
+     oracle.jdbc.driver.T4C8TTILob.readLOBD(T4C8TTILob.java:770)+
+     oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:361)+
+     oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)+
+     oracle.jdbc.driver.T4C8TTILob.read(T4C8TTILob.java:146)+
+     oracle.jdbc.driver.T4CConnection.getBytes(T4CConnection.java:2392)+
+     oracle.sql.BLOB.getBytes(BLOB.java:348)+
+     oracle.sql.BLOB.getBytes(BLOB.java:222)+
+     weblogic.jdbc.wrapper.Blob_oracle_sql_BLOB.getBytes(Unknown Source)+
+     com.ibatis.sqlmap.engine.type.BlobTypeHandlerCallback.getResult(BlobTypeHandlerCallback.java:33)+
+     com.ibatis.sqlmap.engine.type.CustomTypeHandler.getResult(CustomTypeHandler.java:52)+
+     com.ibatis.sqlmap.engine.mapping.result.ResultMap.getPrimitiveResultMappingValue(ResultMap.java:619)+
+     com.ibatis.sqlmap.engine.mapping.result.ResultMap.getResults(ResultMap.java:345)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults(SqlExecutor.java:384)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.handleMultipleResults(SqlExecutor.java:300)+
+     com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery(SqlExecutor.java:189)+
+     com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.sqlExecuteQuery(MappedStatement.java:221)+
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+     com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeQueryForList(MappedStatement.java:139)+
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+     com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:541)+
+     com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118)+
+     com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:94)+
+     com.ibatis.dao.client.template.SqlMapDaoTemplate.queryForList(SqlMapDaoTemplate.java:282)+
Some threads eventually end (after 1-2 hours), most of them remain there for days.
Any hint would be quite useful, thanks.

Threads are executing the actual allocated request from the Weblogic Kernel. Most of the problems happen when the Thread execution is reaching the application or business layer.
At this point your application Java code module is sending or receiving data from external sources such as a an Oracle database for example. Any problem with such external system will cause the Thread to hang and wait for data to come back.
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Doesn't loo like a driver issue.
http://docs.oracle.com/cd/E21764_01/doc.1111/e14770/weblogic_server_issues.htm#autoId2
Check at the Database end
Cheers ...

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Arun wrote:
Hi Mr.David_Aldridge
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Please refer the example in this link which deals with Oracle date format.
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XML_DOCS_CREATED_BY VARCHAR2 (16) NOT NULL,
XML_DOCS_CREATED_DT DATE NOT NULL,
XML_DOCS_MODIFIED_BY VARCHAR2 (16),
XML_DOCS_MODIFIED_DT DATE ) ;
drop index FULL_TEXT_INDEX ;
create INDEX FULL_TEXT_INDEX ON MY_XML_DOCS(XML_RES)
INDEXTYPE IS ctxsys.CONTEXT
parameters ('lexer text_only stoplist ctxsys.empty_stoplist');
BEGIN
CTX_DDL.sync_index('FULL_TEXT_INDEX ','10M');
END;
And I've some XML documents stored in blob columns in the above table. But my query with 'contains' param does not return expected results.(it presently returns no results). Do I miss anything? Do I need to specify any thing else while I create the Index? Kindly advice.

I would agree the CLOB storage would be preferable for XML. If you are using BLOB storage, by default the documents are going to be FILTERed by the INSO_FILTERS. A BLOB column will give you reduced storage in a unicode environment though.
If you wish to store your data in a BLOB though, you should specify the NULL_FILTER in your create index statement to avoid having the INSO_FILTERS invoked.
Further, you may also require a CHARSET column in your table specifying the character set of your data for each row if it can vary. The Column should then also be specified in the 'PARAMETERS' clause of the create index statement, this way Oracle knows the correct character set to use when converting the binary data to character data.
My guess that you are not getting any query results because none of the documents are actually being indexed. Be sure to query the ctx_user_index_errors view to determine if you are getting errors at indexing time.

Processing OrdImage data into a BLOB column

Hi,
I am importing 30Mb Tiff images into an ordsys.ordimage column within an image table. All is fine with the import part. I now want to populate a blob column in the same table with a jpeg generated from the tiff. I have tried many variations of the .process and .processcopy functions but I'm getting nowhere. Can anyone help?

You will need to tell us more about what "getting nowhere" means. Are you getting errors? Or do you just not know where to begin? I'll assume the latter.
First of all, you definitely want to use the processCopy() method. process() will overwrite your original TIFF image. If you want the JPEG in a separate column, you must use processCopy to keep the original and create a new copy. Does your JPEG image have to be in a BLOB column? Why don't you store this in an ORDImage column as well? If you store it in an ORDImage column, you can use the processCopy method. If you must use a BLOB column, you need to look at the processCopy procedure of the relational interface.
The interMedia Quick Start Guide for the Object Interface (there is also one for the relational interface if you really must use a BLOB column for your JPEG image column), has a good example of using the processCopy method to create a JPEG thumbnail. You can find it here:
http://www.oracle.com/technology/sample_code/products/intermedia/files/quickstart_guides/intermedia_qs_image.pdf
See the section on Creating Thumbnails and Changing Formats.
If you have selected the source image into an ORDImage variable imgSrc, and the destination image into a variable imgDst, the process command to create a similar JPEG image is:
imgSrc.processCopy('fileformat=jfif', imgDst);

Help! Problem Updating Blob Columns

Good day
Please i have problems updating Blob columns storing images and doc files. can someone put me through the way out hassle free
Thank You
God Bless U all
Femi

I keep geting this error
java.sql.SQLException: ORA-01729: database link name expected
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:743)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:216)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:955)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1169)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3285)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3368)
when ever i try to update The Blob colum with a Blob object retrieved by resultset.getBlob from another Blob column of a different table.
Blob b = rset.getBlob(1);
String x = (String)jComboBox2.getSelectedItem();
     ps=c.prepareStatement("UPDATE PROPERTIES SET "+x+" = "+b+" WHERE NAME = ?");
     ps.setString(1, (String)jComboBox1.getSelectedItem());
     System.out.println("success");
     ps.executeUpdate();

What is wrong with adding a BLOB column?

What is wrong with adding a BLOB column?
SQL> alter table employee_dp add photo(blob(3000000);
alter table employee_dp add photo(blob(3000000)
ERROR at line 1:
ORA-00902: invalid datatype
SQL> alter table employee_dp add photo bolob(3000000);
alter table employee_dp add photo bolob(3000000)
ERROR at line 1:
ORA-01735: invalid ALTER TABLE option

Hi jetq,
Don't give length.
SQL> alter table t add photo blob;
Table altered.Regards
Peter

Resize a blob column in an Oracle table

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