同一数据库上的相同查询在OAS 10.1.3上给出了不同的结果

Question

I'm seeing something odd when I run a query in an application deployed in Oracle Application Server 10.1.3, with Oracle10g.

When I run a statement against the database directly (eg a standalone app that calls a DAO implemented with hibernate) I see the following:

select 
    documentco0_.CONTENT_ID as CONTENT1_63_0_, 
    documentco0_.TSTAMP as TSTAMP63_0_, 
    documentco0_.CONTENT as CONTENT63_0_ 
from 
    MySchema.MyTable documentco0_ 
where 
    documentco0_.CONTENT_ID=? 

[main] TRACE org.hibernate.type.LongType - binding '1768334' to parameter: 1 
[main] TRACE org.hibernate.type.TimestampType - returning '2013-08-05 17:31:32' as     column: TSTAMP63_0_ 
[main] TRACE org.hibernate.type.BinaryType - returning '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' as column: CONTENT63_0_ 

The same DAO operation when run within the application server however returns the following:

select 
    documentco0_.CONTENT_ID as CONTENT1_63_0_, 
    documentco0_.TSTAMP as TSTAMP63_0_, 
    documentco0_.CONTENT as CONTENT63_0_ 
from 
    MySchema.MyTable documentco0_ 
where 
    documentco0_.CONTENT_ID=? 

2013-08-06 12:49:46,484 TRACE [AJPRequestHandler-RMICallHandler-12] myuser:4 (NullableType.java:133 nullSafeSet()) - binding '1768334' to parameter: 1 
2013-08-06 12:49:46,500 TRACE [AJPRequestHandler-RMICallHandler-12] myuser:4 (NullableType.java:172 nullSafeGet()) - returning '2013-08-05 17:31:32' as column: TSTAMP63_0_ 
2013-08-06 12:49:46,500 TRACE [AJPRequestHandler-RMICallHandler-12] myuser:4 (NullableType.java:172 nullSafeGet()) - returning '80d48081818c808080818080808180808099ff0c809a5c9d809a5c9c80828082808080817f587f608090cac6c9c68081808080804818f7ef8081808080808080808080808080808080808080809a5c9c83408c508081' as column: CONTENT63_0_ 

You can see that the identifier and timestamp are the same in both cases, but the content blob is different: 360 bytes in the first case and 86 bytes in the second case.

The stand-alone application uses a BasicDataSource , while the application on the server uses a JNDI data source. I have verified that the BasicDataSource contains the same JDBC url that is used in the JNDI data source. Both data sources use the same credentials.

The database operation in the application server has a different trace output, using NullableType::nullSafeGet() to display information instead of org.hibernate.type tracing. I'm not sure if that is relevant.

Is there something obvious that I am overlooking here? I can't see why I am getting different results when running the same query on the same database.

edit: on OAS I have configured a JDBC ConnectionPool, that uses connection factory class oracle.jdbc.pool.OracleDataSource , and the JDBC data source is a managed data source pointing to that connection pool.

I'm thinking there may be an issue with different Oracle JDBC drivers? The BasicDataSource for the stand-alone app uses the JDBC driver oracle.jdbc.driver.OracleDriver and the dialect org.hibernate.dialect.Oracle10gDialect . I can't see any place in OAS administration that shows the equivalent values.

Answer 1

Please have a look at this article

Looks like, for some reason, OAS returns only 86 bytes of the BLOB value, unless you specify an Lob handler on your configuration.

You can also have more info on this thread of CodeRanch describing the same issue

Hope this helps!