Class DerbyDataStoreHelper
- All Implemented Interfaces:
DataStoreHelper
- Direct Known Subclasses:
DerbyNetworkServerDataStoreHelper
DerbyDataStoreHelper is a DataStoreHelper implementation
customized for the Derby database.
When mapping a SQLException, the SQLException mappings from the
DerbyDataStoreHelper are searched first, and subsequently, if no match is
found, the SQLException mappings from the GenericDataStoreHelper
are searched.
If you have additional requirements on Derby you should consider subclassing this
implementation.
Note: This class and its methods can not be called or referenced directly by user applications.
SQLException mappings specific to the DerbyDataStoreHelper
are the following:
| Error Code | SQL State | PortableSQLException subclass |
|---|---|---|
| 40000 | StaleConnectionException.class | |
| 45000 | StaleConnectionException.class | |
| 50000 | StaleConnectionException.class | |
| 23505 | DuplicateKeyException.class | |
| 23500 | DuplicateKeyException.class | |
| 23L01 | DuplicateKeyException.class | |
| XCL10 | StaleStatementException.class |
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Field Summary
Fields inherited from interface com.ibm.websphere.rsadapter.DataStoreHelper
CLOUDSCAPE_HELPER, CLOUDSCAPE_NETWORK_SERVER_HELPER, CONNECTJDBC_HELPER, CUSTOM_HELPER, DATADIRECT_HELPER, DB2_390_HELPER, DB2_390_LOCAL_HELPER, DB2_400_HELPER, DB2_HELPER, DB2_UNIVERSAL_HELPER, DERBY_HELPER, DERBY_NETWORK_SERVER_HELPER, FIRST_TIME_CALLED, GENERIC_HELPER, INFORMIX_HELPER, INFORMIX_JCC_HELPER, MSSQL_HELPER, ORACLE_10G_HELPER, ORACLE_11G_HELPER, ORACLE_HELPER, POTENTIAL_DEADLOCK, POTENTIAL_LOST_UPDATE, PROXY_DS_HELPER, SEQUELINK_HELPER, SUBJECT, SYBASE_HELPER, SYBASE11_HELPER, TX_REPEATABLE_READ_FORUPDATE, TX_SERIALIZABLE_FORUPDATE, UNDEFINED_HELPER, UNDEFINED_ISOLATOIN_LEVEL, UPDATE_ON_READONLY -
Constructor Summary
ConstructorsConstructorDescriptionDerbyDataStoreHelper(Properties props) ThisDerbyDataStoreHelperconstructor creates a newDerbyDataStoreHelperbased on theDataStoreHelperproperties provided. -
Method Summary
Modifier and TypeMethodDescriptionvoidThis method cleans up a statement before the statement is returned to the statement cache.final ClassThis method locates thecom.ibm.websphere.ce.cm.PortableSQLExceptionsubclass corresponding to the specifiedSQLException, as defined by theDerbyDataStoreHelper,GenericDataStoreHelper, and user-definedSQLExceptionmaps.intgetIsolationLevel(AccessIntent intent) This method determines the transaction isolation level to use as default for the database backend.final voidsetUserDefinedMap(Map newmap) This method configures a user-definedSQLExceptionmap that supersedes defaultSQLExceptionmappings for theDataStoreHelper.Methods inherited from class com.ibm.websphere.rsadapter.GenericDataStoreHelper
calcPartitionNumber, doConnectionCleanup, doConnectionCleanupPerCloseConnection, doConnectionCleanupWithValidCheck, doConnectionSetup, doConnectionSetupPerGetConnection, doConnectionSetupPerTransaction, getLockType, getMetaData, getPasswordForUseWithTrustedContextWithAuthentication, getPrintWriter, getResultSetConcurrency, getResultSetType, getXAExceptionContents, hasLostUpdateOrDeadLockOccurred, isBatchUpdateSupportedWithAccessIntent, isConnectionError, isDuplicateKey, isTransientConnectionError, isUnsupported, mapException, modifyXAFlag, setConfig, showLockInfo
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Constructor Details
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DerbyDataStoreHelper
ThisDerbyDataStoreHelperconstructor creates a newDerbyDataStoreHelperbased 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.- Parameters:
props-DataStoreHelperproperties.
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Method Details
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doStatementCleanup
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
- maxFieldSize
- maxRows
- queryTimeout
DerbyDataStoreHelperresets all of the statement properties listed above.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.
- Specified by:
doStatementCleanupin interfaceDataStoreHelper- Overrides:
doStatementCleanupin classGenericDataStoreHelper- Parameters:
stmt- the PreparedStatement.- Throws:
SQLException- if an error occurs cleaning up the statement.
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findMappingClass
This method locates the
com.ibm.websphere.ce.cm.PortableSQLExceptionsubclass corresponding to the specifiedSQLException, as defined by theDerbyDataStoreHelper,GenericDataStoreHelper, and user-definedSQLExceptionmaps. Precedence and related details ofSQLExceptionmapping are described on theDataStoreHelper.setUserDefinedMapmethod.Overriding this method is one of three options you have for modifying
SQLExceptionmapping. The other two options are overriding themapExceptionmethod and invoking thesetUserDefinedMapmethod to add a user-definedSQLExceptionmap.- Overrides:
findMappingClassin classGenericDataStoreHelper- Parameters:
e- TheSQLExceptionfor which to locate acom.ibm.websphere.ce.cm.PortableSQLExceptionsubclass.- Returns:
- The
com.ibm.websphere.ce.cm.PortableSQLExceptionsubclass matching theSQLException, or null if no match was found. - See Also:
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getIsolationLevel
This method determines the transaction isolation level to use as default for the database backend. The default transaction isolation level forDerbyDataStoreHelperisConnection.TRANSACTION_REPEATABLE_READ.- Specified by:
getIsolationLevelin interfaceDataStoreHelper- Overrides:
getIsolationLevelin classGenericDataStoreHelper- Parameters:
intent- always null in Liberty- Returns:
- A transaction isolation level appropriate for the specified database.
- Throws:
javax.resource.ResourceException- If a transaction isolation level cannot be determined.
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setUserDefinedMap
This method configures a user-defined
SQLExceptionmap that supersedes defaultSQLExceptionmappings for theDataStoreHelper. TheDataStoreHelperimplementations provided by the application server useSQLExceptionmaps to detect fatal connection errors, as well as other specific types of connection errors. A customDataStoreHelpercan alter the default mappings by invoking this method. Do not invoke this method from a customDataStoreHelperif you also configureidentifyExceptionfor adataSource. When you configureidentifyException, the application server invokes this method to overlay the default error mappings with the error mappings that are specified in the custom property. Do not invoke this method directly from application code.Example usage of the
setUserDefinedMapmethod:public MyCustomDataStoreHelper() { ... java.util.HashMap MyErrorMap = new java.util.HashMap(2); myErrorMap.put(new Integer(-801), MyDuplicateKeyException.class); myErrorMap.put(new Integer(-1015), MyStaleConnectionException.class); setUserDefinedMap(myErrorMap); ... }User-defined exception mapping takes priority over all other exception mapping done by a
DataStoreHelper.For example, assume the following exception mappings are defined:
User-defined mappings SQL State S1000: UserDefinedException Default mappings Error Code 23505: DuplicateKeyException SQL State S1000: StaleConnectionException
Given the above mappings, if a
SQLExceptionis received with SQL State S1000 and Error Code 23505, theDataStoreHelperimplementations map the exception toUserDefinedException.Additionally, mapping done by the
DataStoreHelpers does not include mapping by chained exceptions when no match is found for the original exception.- Specified by:
setUserDefinedMapin interfaceDataStoreHelper- Overrides:
setUserDefinedMapin classGenericDataStoreHelper- Parameters:
newmap- a mapping ofSQLExceptionSQL States and Error Codes tocom.ibm.websphere.ce.cm.PortableSQLExceptionsubclasses. The key for the Map must be aString(representing the SQL State) or anInteger(representing the Error Code). The value for the Map must be a subclass ofcom.ibm.websphere.ce.cm.PortableSQLException. User-defined subclasses are permitted, but are required to declare a public constructor accepting aSQLExceptionas the single parameter.Void.classmay also be used for the value, in which case any existing mapping for the specified SQL State or Error Code is removed.
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