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IBM WebSphere Application ServerTM Release 8 |
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java.lang.Objectcom.ibm.websphere.rsadapter.GenericDataStoreHelper
com.ibm.websphere.rsadapter.MicrosoftSQLServerDataStoreHelper
public class MicrosoftSQLServerDataStoreHelper
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 | |
---|---|
static java.lang.String[] |
LOCK_OWNER_TPYES
|
static java.lang.String[] |
LOCK_REQUEST_MODES
|
static java.lang.String[] |
LOCK_REQUEST_STATUSES
|
static java.lang.String[] |
RESOURCE_TYPES
|
Fields inherited from class com.ibm.websphere.rsadapter.GenericDataStoreHelper |
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customDefinedWasDefaultIsoLevel, defaultQueryTimeout, EOLN, genErrorMap, resBundle, tranErrorList |
Constructor Summary | |
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MicrosoftSQLServerDataStoreHelper(java.util.Properties props)
This MicrosoftSQLServerDataStoreHelper constructor creates a new
MicrosoftSQLServerDataStoreHelper based on the DataStoreHelper
properties provided. |
Method Summary | |
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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 . |
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 |
Field Detail |
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public static final java.lang.String[] RESOURCE_TYPES
public static final java.lang.String[] LOCK_REQUEST_STATUSES
public static final java.lang.String[] LOCK_OWNER_TPYES
public static final java.lang.String[] LOCK_REQUEST_MODES
Constructor Detail |
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public MicrosoftSQLServerDataStoreHelper(java.util.Properties props)
MicrosoftSQLServerDataStoreHelper
constructor creates a new
MicrosoftSQLServerDataStoreHelper
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 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:
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.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_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 |
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
,
Connection
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.
getResultSetConcurrency
in interface DataStoreHelper
getResultSetConcurrency
in class GenericDataStoreHelper
intent
- An AccessIntent
.
java.sql.ResultSet
.
javax.resource.ResourceException
- If a result set concurrency cannot be determined
from the AccessIntent
.AccessIntent
,
ResultSet
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:
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.
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IBM WebSphere Application ServerTM Release 8 |
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