CLOB Support

Character Large Object (CLOB) is a data type used to store and retrieve very long text fields. CLOBs translate into long strings.

To enable CLOB support in the Application Server environment, define a CMP field of type java.lang.String. If you map the CMP bean to an existing database schema, map the field to a column of type CLOB.

To use BLOB or CLOB data types larger than 4 KB for CMP using the Inet Oraxo JDBC Driver for Oracle Databases, you must set the streamstolob property value to true.

For a list of the JDBC drivers currently supported by the Application Server, see the Sun Java System Application Server Platform Edition 9 Release Notes. For configurations of supported and other drivers, see Configurations for Specific JDBC Drivers in Sun Java System Application Server Platform Edition 9 Administration Guide.

For automatic mapping, you might need to change the default CLOB column length for the generated schema using the schema-generator-properties element in sun-ejb-jar.xml. See your database vendor documentation to determine whether you need to specify the length. For example:

<schema-generator-properties>
   <property>
      <name>Employee.resume.jdbc-type</name>
      <value>CLOB</value>
   </property>
   <property>
      <name>Employee.resume.jdbc-maximum-length</name>
      <value>10240</value>
   </property>
   ...
</schema-generator-properties>