com.ibm.websphere.rsadapter

Class ConnectJDBCDataStoreHelper

  1. java.lang.Object
  2. extended byDataDirectDataStoreHelper
  3. extended bycom.ibm.websphere.rsadapter.ConnectJDBCDataStoreHelper

  1. public class ConnectJDBCDataStoreHelper
  2. extends DataDirectDataStoreHelper
ConnectJDBCDataStoreHelper is a DataStoreHelper implementation customized for the DataDirect Technologies Connect JDBC driver.

SQLException mappings specific to the ConnectJDBCDataStoreHelper are the following:

Error CodeSQL StatePortableSQLException subclass
230StaleConnectionException.class
2627DuplicateKeyException.class
2217StaleConnectionException.class
2251StaleConnectionException.class
2306StaleConnectionException.class
2310StaleConnectionException.class
2311StaleConnectionException.class
08000StaleConnectionException.class
08002StaleConnectionException.class
08004StaleConnectionException.class
08007StaleConnectionException.class
40003Void.class
S1000Void.class
If you have additional requirements on the Connect JDBC driver you should consider subclassing this implementation.
Note: This class and its methods can not be called or referenced directly by user applications.

Constructor Summary

Constructor and Description
ConnectJDBCDataStoreHelper(java.util.Properties props)
This ConnectJDBCDataStoreHelper constructor creates a new ConnectJDBCDataStoreHelper based on the DataStoreHelper properties provided.

Method Summary

Modifier and Type Method and Description
  1. void
doStatementCleanup(java.sql.PreparedStatement stmt)
This method cleans up a statement before the statement is returned to the statement cache.
  1. int
getIsolationLevel(AccessIntent intent)
This method determines the transaction isolation level based on the specified AccessIntent.
  1. int
getResultSetConcurrency(AccessIntent intent)
This method determines the result set concurrency based on the specified AccessIntent.
  1. 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.
  1. java.lang.String
showLockInfo(java.util.Properties props)
This method returns lock information for Microsoft SQL Server.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConnectJDBCDataStoreHelper

  1. public ConnectJDBCDataStoreHelper( java.util.Properties props)
This 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.
Parameters:
props - DataStoreHelper properties.

Method Detail

doStatementCleanup

  1. public void doStatementCleanup( java.sql.PreparedStatement stmt)
  2. 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,

  • cursorName
  • fetchDirection
  • longDataCacheSize
  • maxFieldSize
  • maxRows
  • queryTimeout

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.

Parameters:
stmt - the PreparedStatement.
Throws:
java.sql.SQLException - if an error occurs cleaning up the statement.

getResultSetConcurrency

  1. public int getResultSetConcurrency( AccessIntent intent)
  2. throws javax.resource.ResourceException
This method determines the result set concurrency based on the specified 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.
Parameters:
intent - An AccessIntent.
Returns:
A result set concurrency constant defined on java.sql.ResultSet.
Throws:
javax.resource.ResourceException - If a result set concurrency cannot be determined from the AccessIntent.
See Also:
AccessIntent, ResultSet

getIsolationLevel

  1. public int getIsolationLevel(AccessIntent intent)
  2. throws javax.resource.ResourceException
This method determines the transaction isolation level based on the specified 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
Parameters:
intent - An AccessIntent
Returns:
A transaction isolation level appropriate for the specified AccessIntent.
Throws:
javax.resource.ResourceException - If a transaction isolation level cannot be determined from the AccessIntent.
See Also:
AccessIntent, Connection

isDuplicateKey

  1. 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.

Parameters:
sqlX - the error.
Returns:
true if the error indicates a duplicate key violation, otherwise false.

showLockInfo

  1. public java.lang.String showLockInfo( java.util.Properties props)
  2. throws java.lang.Exception

This method returns lock information for Microsoft SQL Server. The props parameter can include the following properties:

  1. user - user name that has a DBA authority. If not specified, a default value of "sa" is used.
  2. password - the password corresponding to the user name. If not specified, a default value of "" (empty string) is used.
  3. serverName - the server name where the Microsoft SQL Server database resides.
  4. portNumber - the port where Microsoft SQL Server is listening.
Parameters:
props - properties containing information needed to connect to the database.
Returns:
the lock information.
Throws:
java.lang.Exception - if an error occurs while collecting the lock information.