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IBM WebSphere Application ServerTM Release 8 |
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java.lang.ObjectDataDirectDataStoreHelper
com.ibm.websphere.rsadapter.ConnectJDBCDataStoreHelper
public class ConnectJDBCDataStoreHelper
ConnectJDBCDataStoreHelper
is a DataStoreHelper
implementation
customized for the DataDirect Technologies Connect JDBC driver.
SQLException
mappings specific to the ConnectJDBCDataStoreHelper
are the following:
Error Code | SQL State | PortableSQLException subclass |
---|---|---|
230 | StaleConnectionException.class | |
2627 | DuplicateKeyException.class | |
2217 | StaleConnectionException.class | |
2251 | StaleConnectionException.class | |
2306 | StaleConnectionException.class | |
2310 | StaleConnectionException.class | |
2311 | StaleConnectionException.class | |
08000 | StaleConnectionException.class | |
08002 | StaleConnectionException.class | |
08004 | StaleConnectionException.class | |
08007 | StaleConnectionException.class | |
40003 | Void.class | |
S1000 | Void.class |
Constructor Summary | |
---|---|
ConnectJDBCDataStoreHelper(java.util.Properties props)
This ConnectJDBCDataStoreHelper constructor creates a new
ConnectJDBCDataStoreHelper based on the DataStoreHelper
properties provided. |
Method Summary | |
---|---|
boolean |
doConnectionCleanup(java.sql.Connection conn)
This method is used to clean up a connection before it is returned to the connection pool for later reuse. |
void |
doStatementCleanup(java.sql.PreparedStatement stmt)
This method cleans up a statement before the statement is returned to the statement cache. |
int |
getIsolationLevel(AccessIntent intent)
This method determines the transaction isolation level based on the specified AccessIntent . |
int |
getResultSetConcurrency(AccessIntent intent)
This method determines the result set concurrency based on the specified AccessIntent . |
boolean |
isDuplicateKey(java.sql.SQLException sqlX)
The application server invokes this method to determine whether or not the specified error indicates a duplicate key violation. |
java.lang.String |
showLockInfo(java.util.Properties props)
This method returns lock information for Microsoft SQL Server. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ConnectJDBCDataStoreHelper(java.util.Properties props)
ConnectJDBCDataStoreHelper
constructor creates a new
ConnectJDBCDataStoreHelper
based on the DataStoreHelper
properties provided. All implementations inheriting from a data store helper
must supply this same list of properties to their super class by invoking the
constructor of their super class with the list of properties.
props
- DataStoreHelper
properties.Method Detail |
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public boolean doConnectionCleanup(java.sql.Connection conn) throws java.sql.SQLException
This method is used to clean up a connection before it is returned to the connection
pool for later reuse. WebSphere automatically resets all standard connection
properties (fields for which getters and setters are defined on
java.sql.Connection
).
This method may be used to reset other properties proprietary to a specific
JDBC driver/database and do whatever else is necessary to prepare the connection for
reuse.
A DataStoreHelper
is permitted to use the provided connection to create
and execute statements for the purpose of cleaning up the connection. Any statements
created within the doConnectionCleanup
method must be explicitly closed
within the doConnectionCleanup
method. The
doConnectionCleanup
method must never close the
connection being cleaned up.
If any standard connection properties are modified in this method, a value of true must be returned, indicating to WebSphere that at least one standard connection property was modified. A value of false is returned only if no standard connection properties were modified.
ConnectJDBCDataStoreHelper
resets the network timeout to 0.
conn
- the connection to attempt to clean up.
java.sql.SQLException
- If an error occurs while cleaning up the connection.public void doStatementCleanup(java.sql.PreparedStatement stmt) throws java.sql.SQLException
This method cleans up a statement before the statement is returned to the statement cache. This method is called only for statements that will be cached. It is called only if at least one of the following statement properties has changed,
ConnectJDBCDataStoreHelper
resets all of the statement properties listed above
except for the cursorName
property.
The following operations do not need to be included in the statement cleanup since they are automatically performed by WebSphere when caching statements,
setFetchSize(0)
clearParameters()
clearWarnings()
A helper class implementing this method may choose to do additional cleanup for the statement. However, this should never include closing the statement, since the statement is intended to be cached.
stmt
- the PreparedStatement.
java.sql.SQLException
- if an error occurs cleaning up the statement.public int getResultSetConcurrency(AccessIntent intent) throws javax.resource.ResourceException
AccessIntent
.
ConnectJDBCDataStoreHelper
returns
java.sql.ResultSet.CONCUR_UPDATABLE
if the access type of the
AccessIntent
is AccessIntent.ACCESS_TYPE_UPDATE
and the
concurrency control is AccessIntent.CONCURRENCY_CONTROL_PESSIMISTIC
and
the update lock hint is either
AccessIntent.PESSIMISTIC_UPDATE_LOCK_HINT_EXCLUSIVE
or
AccessIntent.PESSIMISTIC_UPDATE_LOCK_HINT_NONE
. In all other cases,
java.sql.ResultSet.CONCUR_UPDATABLE
is returned.
intent
- An AccessIntent
.
java.sql.ResultSet
.
javax.resource.ResourceException
- If a result set concurrency cannot be determined
from the AccessIntent
.AccessIntent
,
ResultSet
public int getIsolationLevel(AccessIntent intent) throws javax.resource.ResourceException
AccessIntent
.
If the AccessIntent
parameter is null, a default value is returned
that is appropriate for the database backend. The default transaction isolation level
for ConnectJDBCDataStoreHelper
is
Connection.TRANSACTION_REPEATABLE_READ.
In the case where an AccessIntent
is specified,
ConnectJDBCDataStoreHelper
computes the transaction isolation level as follows:
If the concurrency control is
AccessIntent.CONCURRENCY_CONTROL_OPTIMISTIC
then a transaction isolation
level of Connection.TRANSACTION_READ_COMMITTED
is returned.
If the concurrency control is
AccessIntent.CONCURRENCY_CONTROL_PESSIMISTIC
and the access type is
AccessIntent.ACCESS_TYPE_READ
then a transaction isolation level of
Connection.TRANSACTION_REPEATABLE_READ
is returned.
If the concurrency control is
AccessIntent.CONCURRENCY_CONTROL_PESSIMISTIC
and the access type is
AccessIntent.ACCESS_TYPE_UPDATE
then the transation isolation level is
determined from the following table based on the pessimistic update lock hint.
pessimistic update lock hint | transaction isolation level |
---|---|
AccessIntent.PESSIMISTIC_UPDATE_LOCK_HINT_NONE AccessIntent.PESSIMISTIC_UPDATE_LOCK_HINT_WEAKEST_LOCK_AT_LOAD |
Connection.TRANSACTION_REPEATABLE_READ |
AccessIntent.PESSIMISTIC_UPDATE_LOCK_HINT_NOCOLLISION |
Connection.TRANSACTION_READ_COMMITTED |
AccessIntent.PESSIMISTIC_UPDATE_LOCK_HINT_EXCLUSIVE |
Connection.TRANSACTION_SERIALIZABLE |
intent
- An AccessIntent
AccessIntent
.
javax.resource.ResourceException
- If a transaction isolation level cannot be determined
from the AccessIntent
.AccessIntent
,
Connection
public boolean isDuplicateKey(java.sql.SQLException sqlX)
The application server invokes this method to determine whether or not the specified error indicates a duplicate key violation. The method is invoked regardless of the data source's error detection model.
sqlX
- the error.
public java.lang.String showLockInfo(java.util.Properties props) throws java.lang.Exception
This method returns lock information for Microsoft SQL Server. The
props
parameter can include the following properties:
props
- properties containing information needed to connect to the database.
java.lang.Exception
- if an error occurs while collecting the lock information.
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IBM WebSphere Application ServerTM Release 8 |
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