Does anyone know how I am going to set this up in XDoclet? > -----Original Message----- > From: Horvath, Tibor > Sent: Tuesday, July 20, 2004 4:45 PM > To: Horvath, Tibor; Knutson, Mick > Subject: RE: http://e-docs.bea.com/wls/docs61/ejb/cmp.html#1061636 > > > > -----Original Message----- > From: Horvath, Tibor > Sent: Tuesday, July 20, 2004 3:02 PM > To: Knutson, Mick > Subject: http://e-docs.bea.com/wls/docs61/ejb/cmp.html#1061636 > > BLOB and CLOB DBMS Column Support for the Oracle DBMS > > WebLogic Server supports Oracle Binary Large Object (BLOB) and Character > Large Object (CLOB) DBMS columns with EJB CMP. BLOBs and CLOBs are data > types used for efficient storage and retrieval of large objects. CLOBs are > string or char objects; BLOBs are binary or serializable objects such as > pictures that translate into large byte arrays. > > BLOBs and CLOBs map a string variable, a value of OracleBlob or > OracleClob, to a BLOB or CLOB column. WebLogic Server maps CLOBs only to > the data type java.lang.string. At this time, no support is available for > mapping char arrays to a CLOB column. > > To enable BLOB/CLOB support: > > In the bean class, declare the variable. > Edit the XML by declaring the dbms-column-type deployment descriptor > in the weblogic-cmp-rdbms jar.xml file. > Create the BLOB or CLOB in the Oracle database. > > Using BLOB or CLOB may slow performance because of the size of the BLOB or > CLOB object. > > Specifying a BLOB Using the Deployment Descriptor > > The following XML code shows how to specify a BLOB object using the > dbms-column element in weblogic-cmp-rdbms-jar-xml file. > > Figure 5-2 Specifying a BLOB object > > <field-map> > <cmp-field>photo</cmp-field> > <dbms-column>PICTURE</dbms-column> > <dbms_column-type>OracleBlob</dbms-column-type> > </field-map> > > Controlling Serialization of cmp-fields Mapped to OracleBlobs > > By default, when WebLogic Server writes and reads a cmp-field of type > byte[] that is mapped to an OracleBlob, it serializes and deserializes the > field, respectively. > Mick, > This and the previous message came from searching the BEA web site. > Do you have this covered? > The clob(4000) seems to be a red herring. All clobs show up as 4000 on > Oracle DESCRIBE command. > Tibor > > If WebLogic Server reads a BLOB that was written directly to the database > by another program, errors can result, because the container assumes that > the data is serialized. > > To specify that the data is not serialized, compile the EJB with this > flag: > > java -Dweblogic.byteArrayIsSerializedToOracleBlob=false > weblogic.ejbc std_ejb.jar ejb.jar > > Specifying a CLOB Using the Deployment Descriptors > > The following XML code shows how to specify a CLOB object using the > dbms-column element in the weblogic-cmp-rdbms-jar-xml file. > > Figure 5-3 Specifying a CLOB object > > <field-map> > <cmp-field>description</cmp-field> > <dbms-column>product_description</dbms-column> > <dbms_column-type>OracleClob</dbms-column-type> > </field-map> >
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