web server - Borland Technical Publications

Setting Properties
Table 16.3
Table properties
Property Type Default Description
datasource java.lang.String None JNDI datasource name of the database for
this table.
optimisticConcu
rrencyBehavior
useGetGenerated
Keys
primaryKeyGener
ationListener
dbcAccesserFact
ory
getPrimaryKeyBe
foreInsertSql
getPrimaryKeyAf
terInsertSql
java.lang.String
UpdateMo
difiedFi
elds
The container uses optimistic or pessimistic
concurrency to control multiple transactions
(updates) that access shared tables.
Acceptable values are:
■ SelectForUpdate: database locks the row
until the current transaction is
committed or rolled back. Other selects
on the row are blocked (wait) until then.
■ SelectForUpdateNoWAIT: database locks
the row until the current transaction is
committed or rolled back. Other selects
on the row will fail.
■ UpdateAllFields: perform an update on
all of an entity's fields, regardless if they
were modified or not.
■ UpdateModifiedFields: perform an update
only on fields known to have been
modified prior to the update being
issued.
■ VerifyModifiedFields: verify the entity's
modified fields against the database
prior to update.
■ VerifyAllFields: verify all the entity's
fields against the database prior to
update regardless if they were modified
or not.
Pessimistic concurrency specifies the
container to allow only one transaction at a
time to access the entity bean. Other
transactions that try to access the same
data will block (wait) until the first
transaction completes. This is achieved by
issuing a tuned SQL with FOR UPDATE when
the entity bean is loaded. To achieve
pessimistic concurrency set SelectForUpdate
or SelectForUpdateNoWAIT.
java.lang.Boolean False Whether to use the JDBC3
java.sql.Statement.getGeneratedKeys()
method to populate the primary key from
autoincrement/sequence SQL fields.
Currently, only Borland JDataStore
supports this statement.
java.lang.String None Specifies a class, written by the user, that
implements
com.borland.ejb.pm.PrimaryKeyGenerationList
ener interface and generates primary keys.
java.lang.String None A factory class that can provide accessor
class implementations to get values from a
java.sql.ResultSet, and set values for a
java.sql.PreparedStatement.
java.lang.String None SQL statement to execute before inserting
a row to provide primary key column
names.
java.lang.String None SQL statement to execute after inserting a
row to provide primary key column names.
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