Class DB2AS400DataStoreHelper
- java.lang.Object
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- com.ibm.websphere.rsadapter.GenericDataStoreHelper
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- com.ibm.websphere.rsadapter.DB2DataStoreHelper
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- com.ibm.websphere.rsadapter.DB2AS400DataStoreHelper
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- All Implemented Interfaces:
- DataStoreHelper
public class DB2AS400DataStoreHelper extends DB2DataStoreHelper
DB2AS400DataStoreHelper
is aDataStoreHelper
implementation customized for DB2 on iSeries. When mapping aSQLException
, theSQLException
mappings from theDB2DataStoreHelper
are searched first, and subsequently, if no match is found, theSQLException
mappings from theGenericDataStoreHelper
are searched. If you have additional requirements on DB2 on iSeries you should consider subclassing this implementation.
Note: This class and its methods can not be called or referenced directly by user applications.
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Field Summary
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Fields inherited from class com.ibm.websphere.rsadapter.DB2DataStoreHelper
db2Tc
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Fields inherited from class com.ibm.websphere.rsadapter.GenericDataStoreHelper
customDefinedWasDefaultIsoLevel, defaultQueryTimeout, EOLN, genErrorMap, resBundle, tranErrorList
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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
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Constructor Summary
Constructors Constructor and Description DB2AS400DataStoreHelper(java.util.Properties props)
ThisDB2DataStoreHelper
constructor creates a newDB2DataStoreHelper
based on theDataStoreHelper
properties provided.
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Method Summary
Methods Modifier and Type Method and Description 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.boolean
isBatchUpdateSupportedWithAccessIntent(AccessIntent accessIntent)
This method is used to determine if CMP Entity Beans can support batch updates with the given AccessIntent.-
Methods inherited from class com.ibm.websphere.rsadapter.DB2DataStoreHelper
doConnectionSetup, findMappingClass, getIsolationLevel, getLockType, getPrintWriter, getResultSetConcurrency, getXAExceptionContents, setUserDefinedMap, showLockInfo
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Methods inherited from class com.ibm.websphere.rsadapter.GenericDataStoreHelper
calcPartitionNumber, doConnectionCleanupPerCloseConnection, doConnectionCleanupWithValidCheck, doConnectionSetupPerGetConnection, doConnectionSetupPerTransaction, getMetaData, getPasswordForUseWithTrustedContextWithAuthentication, getResultSetType, hasLostUpdateOrDeadLockOccurred, isConnectionError, isDuplicateKey, isTransientConnectionError, mapException, modifyXAFlag, setConfig
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Constructor Detail
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DB2AS400DataStoreHelper
public DB2AS400DataStoreHelper(java.util.Properties props)
ThisDB2DataStoreHelper
constructor creates a newDB2DataStoreHelper
based on theDataStoreHelper
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.
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Method Detail
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doConnectionCleanup
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 thedoConnectionCleanup
method must be explicitly closed within thedoConnectionCleanup
method. ThedoConnectionCleanup
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.
DB2AS400DataStoreHelper
clears allSQLWarnings
on the connection.- Specified by:
doConnectionCleanup
in interfaceDataStoreHelper
- Overrides:
doConnectionCleanup
in classGenericDataStoreHelper
- Parameters:
conn
- the connection to attempt to cleanup.- Returns:
- false because no standard connection properties are modified.
- Throws:
java.sql.SQLException
- If an error occurs while cleaning up the connection.- See Also:
Connection
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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 will be cached. It is called only if at least one of the following statement properties has changed,
- cursorName
- fetchDirection
- maxFieldSize
- maxRows
- queryTimeout
DB2AS400DataStoreHelper
resets all five of the 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:
doStatementCleanup
in interfaceDataStoreHelper
- Overrides:
doStatementCleanup
in classDB2DataStoreHelper
- Parameters:
stmt
- the PreparedStatement.- Throws:
java.sql.SQLException
- if an error occurs cleaning up the statement.
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isBatchUpdateSupportedWithAccessIntent
public boolean isBatchUpdateSupportedWithAccessIntent(AccessIntent accessIntent)
This method is used to determine if CMP Entity Beans can support batch updates with the given AccessIntent. There are some AccessIntents (for example, WebSphere Optimistic Concurrency Control intent) for which some databases are not always capable of determining the number of updated rows. This prevents CMP Entity Beans from being able to support batch updates. In such cases, this method must return false.DB2AS400DataStoreHelper
returns a value of true, indicating batch updates are always supported. If necessary, you may change this value by overriding this method.- Specified by:
isBatchUpdateSupportedWithAccessIntent
in interfaceDataStoreHelper
- Overrides:
isBatchUpdateSupportedWithAccessIntent
in classDB2DataStoreHelper
- Parameters:
accessIntent
- AccessIntent- Returns:
- boolean true if batching is allowed with the given AccessIntent, otherwise false.
- Since:
- WAS 5.0.2
- See Also:
AccessIntent
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