com.ibm.websphere.rsadapter
Class MicrosoftSQLServerDataStoreHelper
- java.lang.Object
com.ibm.websphere.rsadapter.GenericDataStoreHelper
com.ibm.websphere.rsadapter.MicrosoftSQLServerDataStoreHelper
- public class MicrosoftSQLServerDataStoreHelper
- extends GenericDataStoreHelper
MicrosoftSQLServerDataStoreHelper is provided as an implementation of
the DataStoreHelper interface to enable connectivity to Microsoft SQL Server
via the Microsoft SQL Server JDBC Driver.
If you have additional requirements with the Microsoft SQL Server JDBC Driver
or the Microsoft SQL Server database, you should consider subclassing this implementation.
Note: This class and its methods cannot be called or referenced directly by applications.
SQLException mappings specific to the
MicrosoftSQLServerDataStoreHelper are the following:
| Error Code | SQL State | PortableSQLException subclass |
|---|---|---|
| 230 | StaleConnectionException.class | |
| 2627 | DuplicateKeyException.class | |
| 6002 | StaleConnectionException.class |
Field Summary
| Modifier and Type | Field and Description |
|---|---|
|
LOCK_OWNER_TPYES
|
|
LOCK_REQUEST_MODES
|
|
LOCK_REQUEST_STATUSES
|
|
RESOURCE_TYPES
|
| Fields inherited from class com.ibm.websphere.rsadapter.GenericDataStoreHelper |
|---|
customDefinedWasDefaultIsoLevel, defaultQueryTimeout, EOLN, genErrorMap, resBundle, tranErrorList |
Constructor Summary
| Constructor and Description |
|---|
MicrosoftSQLServerDataStoreHelper(java.util.Properties props)
This
MicrosoftSQLServerDataStoreHelper constructor creates a new
MicrosoftSQLServerDataStoreHelper based on the DataStoreHelper
properties provided.
|
Method Summary
| Modifier and Type | Method and Description |
|---|---|
|
doStatementCleanup(java.sql.PreparedStatement stmt)
This method cleans up a statement before the statement is returned to the statement
cache.
|
|
getIsolationLevel(AccessIntent intent)
This method determines the transaction isolation level based on the specified
AccessIntent.
|
|
getResultSetConcurrency(AccessIntent intent)
This method determines the result set concurrency based on the specified
AccessIntent.
|
|
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 |
Field Detail
RESOURCE_TYPES
- public static final java.lang.String[] RESOURCE_TYPES
LOCK_REQUEST_STATUSES
- public static final java.lang.String[] LOCK_REQUEST_STATUSES
LOCK_OWNER_TPYES
- public static final java.lang.String[] LOCK_OWNER_TPYES
LOCK_REQUEST_MODES
- public static final java.lang.String[] LOCK_REQUEST_MODES
Constructor Detail
MicrosoftSQLServerDataStoreHelper
- public MicrosoftSQLServerDataStoreHelper( java.util.Properties props)
props - DataStoreHelper properties. Method Detail
doStatementCleanup
- 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 are cached. It is called only if at least one of the following statement properties has changed:
- cursorName
- fetchDirection
- maxFieldSize
- maxRows
- queryTimeout
- responseBuffering
MicrosoftSQLServerDataStoreHelper resets all of the
properties listed above.
The following operations do not need to be included in the statement cleanup since they are automatically performed by the application server 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.
doStatementCleanup in interface DataStoreHelper
doStatementCleanup in class GenericDataStoreHelper
stmt - the PreparedStatement. java.sql.SQLException - if an error occurs cleaning up the statement. getIsolationLevel
- public int getIsolationLevel(AccessIntent intent)
- throws javax.resource.ResourceException
AccessIntent.
If the AccessIntent parameter is null, the following default value is
returned:
Connection.TRANSACTION_REPEATABLE_READ.
In the case where an AccessIntent is specified,
MicrosoftSQLServerDataStoreHelper computes the transaction isolation
level as follows:
If the concurrency control is
AccessIntent.CONCURRENCY_CONTROL_OPTIMISTICthen a transaction isolation level ofConnection.TRANSACTION_READ_COMMITTEDis returned.If the concurrency control is
AccessIntent.CONCURRENCY_CONTROL_PESSIMISTICand the access type isAccessIntent.ACCESS_TYPE_READthen a transaction isolation level ofConnection.TRANSACTION_REPEATABLE_READis returned.If the concurrency control is
AccessIntent.CONCURRENCY_CONTROL_PESSIMISTICand the access type isAccessIntent.ACCESS_TYPE_UPDATEthen 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_LOADConnection.TRANSACTION_REPEATABLE_READAccessIntent.PESSIMISTIC_UPDATE_LOCK_HINT_NOCOLLISIONConnection.TRANSACTION_READ_COMMITTEDAccessIntent.PESSIMISTIC_UPDATE_LOCK_HINT_EXCLUSIVEConnection.TRANSACTION_SERIALIZABLE
getIsolationLevel in interface DataStoreHelper
getIsolationLevel in class GenericDataStoreHelper
intent - An AccessIntent AccessIntent. javax.resource.ResourceException - If a transaction isolation level cannot be determined
from the AccessIntent. AccessIntent,
ConnectiongetResultSetConcurrency
- public int getResultSetConcurrency( AccessIntent intent)
- throws javax.resource.ResourceException
AccessIntent.
MicrosoftSQLServerDataStoreHelper 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_READ_ONLY is returned.
intent - An AccessIntent. java.sql.ResultSet. javax.resource.ResourceException - If a result set concurrency cannot be determined
from the AccessIntent. AccessIntent,
ResultSetshowLockInfo
- public final 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:
- user user name that has a DBA authority. If not specified, a default value of "sa" is used.
- password the password corresponding to the user name. If not specified, a default value of "" (empty string) is used.
- serverName the server name where the Microsoft SQL Server database resides.
- portNumber the port where Microsoft SQL Server is listening.
showLockInfo in class GenericDataStoreHelper
props - properties containing information needed to connect to the database. java.lang.Exception - if an error occurs while collecting the lock information.
MicrosoftSQLServerDataStoreHelperconstructor creates a newMicrosoftSQLServerDataStoreHelperbased on theDataStoreHelperproperties 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.