org.eclipse.persistence.platform.database

Class OraclePlatform

java.lang.Object

org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

org.eclipse.persistence.platform.database.DatabasePlatform

org.eclipse.persistence.platform.database.OraclePlatform

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Platform

Direct Known Subclasses:

Oracle8Platform

public class OraclePlatform
extends DatabasePlatform

Purpose: Provides Oracle specific behavior.

Responsibilities:

• Native SQL for byte[], Date, Time, & Timestamp.
• Native sequencing named sequences.
• Native SQL/ROWNUM support for MaxRows and FirstResult filtering.

Since:

TOPLink/Java 1.0

See Also:

Serialized Form

Field Summary

Fields inherited from class org.eclipse.persistence.platform.database.DatabasePlatform

DEFAULT_VARCHAR_SIZE

Fields inherited from class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

DEFAULT_MAX_BATCH_WRITING_SIZE, DEFAULT_PARAMETERIZED_MAX_BATCH_WRITING_SIZE, IS_VALID_TIMEOUT, Types_NCLOB, Types_SQLXML

Constructor Summary

Constructors

Constructor and Description
OraclePlatform()

Method Summary

Modifier and Type	Method and Description
boolean	allowsSizeInProcedureArguments() Used for stored procedure definitions.
ExpressionOperator	atan2Operator() INTERNAL: Build operator.
DatabaseCall	buildCallWithReturning(SQLCall sqlCall, java.util.Vector returnFields) INTERNAL: Returns null unless the platform supports call with returning
ValueReadQuery	buildSelectQueryForIdentity(java.lang.String qualifiedSeqName, java.lang.Integer size) INTERNAL: Though Oracle doesn't support identity it could be imitated, see comment to setSupportsIdentity method.
ValueReadQuery	buildSelectQueryForSequenceObject(java.lang.String qualifiedSeqName, java.lang.Integer size) INTERNAL: Produce a DataReadQuery which updates(!) the sequence number in the db and returns it.
boolean	canBuildCallWithReturning() INTERNAL: Indicates whether the platform can build call with returning.
boolean	canUnwrapOracleConnection() INTERNAL: Indicates whether this Oracle platform can unwrap Oracle connection.
void	clearOracleConnectionCache(java.sql.Connection conn) INTERNAL: Clears both implicit and explicit caches of OracleConnection on Oracle9Platform, noop here.
static ExpressionOperator	exceptOperator() INTERNAL: Create the EXCEPT operator, MINUS in Oracle.
java.lang.String	getAssignmentString() INTERNAL: Used for stored function calls.
java.lang.String	getBatchBeginString() Used for batch writing and sp defs.
java.lang.String	getBatchEndString() Used for batch writing and sp defs.
java.lang.String	getDeclareBeginString() INTERNAL: DECLARE stanza header for Anonymous PL/SQL block
int	getMaxFieldNameSize() INTERNAL: returns the maximum number of characters that can be used in a field name on this platform.
java.util.Vector	getNativeTableInfo(java.lang.String table, java.lang.String creator, AbstractSession session) Return the catalog information through using the native SQL catalog selects.
java.lang.Object	getObjectFromResultSet(java.sql.ResultSet resultSet, int columnNumber, int type, AbstractSession session) INTERNAL: Get a timestamp value from a result set.
java.lang.String	getProcedureArgumentSetter() Used for sp calls.
java.lang.String	getProcedureCallHeader() Used for sp calls.
java.lang.String	getProcedureCallTail() Used for sp calls.
java.lang.String	getSelectForUpdateString() Most database support a syntax.
java.lang.String	getSelectForUpdateWaitString(java.lang.Integer waitTimeout) Platforms that support the WAIT option should override this method.
java.lang.String	getStoredProcedureParameterPrefix()
java.lang.String	getStoredProcedureTerminationToken()
ValueReadQuery	getSystemChangeNumberQuery() PUBLIC: The query to select the current system change number from Oracle.
ValueReadQuery	getTimestampQuery() PUBLIC: This method returns the query to select the timestamp from the server for Oracle.
DatabaseQuery	getVPDClearIdentifierQuery(java.lang.String vpdIdentifier) INTERNAL: Return an Oracle defined VPD clear identifier query.
java.lang.String	getVPDCreationFunctionString(java.lang.String tableName, java.lang.String tenantFieldName) INTERNAL: Return an Oracle defined VPD identifier function.
java.lang.String	getVPDCreationPolicyString(java.lang.String tableName, AbstractSession session) INTERNAL: Return an Oracle defined VPD identifier policy.
java.lang.String	getVPDDeletionString(java.lang.String tableName, AbstractSession session) INTERNAL: Return an Oracle defined VPD identifier policy deletion.
DatabaseQuery	getVPDSetIdentifierQuery(java.lang.String vpdIdentifier) INTERNAL: Return an Oracle defined VPD set identifier query.
boolean	isAlterSequenceObjectSupported() INTERNAL: Override this method if the platform supports sequence objects and it's possible to alter sequence object's increment in the database.
boolean	isForUpdateCompatibleWithDistinct() INTERNAL: Indicates whether SELECT DISTINCT ...
boolean	isLockTimeoutException(DatabaseException e) Return true if the given exception occurred as a result of a lock time out exception (WAIT clause).
boolean	isNativeConnectionRequiredForLobLocator() INTERNAL: Used by derived platforms (Oracle8Platform and higher) to indicate whether app.
boolean	isOracle()
java.util.Hashtable	maximumNumericValues() Builds a table of maximum numeric values keyed on java class.
java.util.Hashtable	minimumNumericValues() Builds a table of minimum numeric values keyed on java class.
void	printFieldNullClause(java.io.Writer writer) INTERNAL: Append the receiver's field 'NULL' constraint clause to a writer.
void	printSQLSelectStatement(DatabaseCall call, ExpressionSQLPrinter printer, SQLSelectStatement statement) INTERNAL: Print the SQL representation of the statement on a stream, storing the fields in the DatabaseCall.
static ExpressionOperator	regexpOperator() INTERNAL: Create the REGEXP_LIKE operator.
java.lang.String	serverTimestampString() Return the current date and time from the server.
void	setSupportsIdentity(boolean supportsIdentity) ADVANCED: Oracle db doesn't support identity.
boolean	shouldUseJDBCOuterJoinSyntax() JDBC defines and outer join syntax, many drivers do not support this.
boolean	supportsAutoConversionToNumericForArithmeticOperations() Some db allow VARCHAR db field to be used in arithmetic operations automatically converting them to numeric: UPDATE OL_PHONE SET PHONE_ORDER_VARCHAR = (PHONE_ORDER_VARCHAR + 1) WHERE ...
boolean	supportsIdentity() INTERNAL: Indicates whether the platform supports identity.
boolean	supportsSelectForUpdateNoWait() Returns true if the database supports SQL syntax not to wait on a SELECT..FOR UPADTE (i.e.
boolean	supportsSequenceObjects() INTERNAL: Indicates whether the platform supports sequence objects.
boolean	supportsStoredFunctions() INTERNAL: Return if database stored functions are supported.
boolean	supportsVPD() Oracle db supports VPD.
java.sql.Connection	unwrapOracleConnection(java.sql.Connection connection) INTERNAL: If can unwrap returns unwrapped Oracle connection, otherwise original connection.
boolean	wasFailureCommunicationBased(java.sql.SQLException exception, java.sql.Connection connection, AbstractSession sessionForProfile) INTERNAL: A call to this method will perform a platform based check on the connection and exception error code to determine if the connection is still valid or if a communication error has occurred.

Methods inherited from class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

addBatch, addStructConverter, appendLiteralToCall, appendParameter, appendParameterInternal, autoCommit, beginTransaction, buildBatchCriteria, buildBatchCriteriaForComplexId, buildCreateIndex, buildCreateIndex, buildDropIndex, buildDropIndex, buildProcedureCallString, buildSequenceObjectAlterIncrementWriter, buildSequenceObjectCreationWriter, buildSequenceObjectDeletionWriter, canBatchWriteWithOptimisticLocking, commitTransaction, computeMaxRowsForSQL, convertToDatabaseType, copyInto, createArray, createArray, createStruct, createStruct, dontBindUpdateAllQueryUsingTempTables, executeBatch, executeStoredProcedure, freeTemporaryObject, getBatchDelimiterString, getCastSizeForVarcharParameter, getClassTypes, getConnection, getConstraintDeletionString, getCreateViewString, getCreationInOutputProcedureToken, getCreationOutputProcedureToken, getCursorCode, getCustomModifyValueForCall, getDefaultSequenceTableName, getFieldTypeDefinition, getFieldTypes, getFunctionCallHeader, getIdentifierQuoteCharacter, getIndexNamePrefix, getInOutputProcedureToken, getInputProcedureToken, getJDBCOuterJoinString, getJDBCType, getJDBCType, getJDBCTypeForSetNull, getJdbcTypeName, getMaxBatchWritingSize, getMaxForeignKeyNameSize, getMaxIndexNameSize, getMaxUniqueKeyNameSize, getNoWaitString, getOutputProcedureToken, getPartitioningCallback, getPingSQL, getProcedureArgumentString, getProcedureAsString, getProcedureBeginString, getProcedureEndString, getQualifiedName, getQualifiedSequenceTableName, getRefValue, getRefValue, getSelectForUpdateNoWaitString, getSelectForUpdateOfString, getSequenceCounterFieldName, getSequenceNameFieldName, getSequencePreallocationSize, getSequenceTableName, getStatementCacheSize, getStringBindingSize, getStructConverters, getTableCreationSuffix, getTempTableForTable, getTransactionIsolation, getTypeConverters, hasPartitioningCallback, initialize, initializeConnectionData, isCastRequired, isDynamicSQLRequiredForFunctions, isInformixOuterJoin, isNullAllowedInSelectClause, isXDBDocument, minimumTimeIncrement, prepareBatchStatement, printFieldIdentityClause, printFieldNotNullClause, printFieldTypeSize, printFieldUnique, printStoredFunctionReturnKeyWord, printValuelist, printValuelist, registerOutputParameter, requiresNamedPrimaryKeyConstraints, requiresProcedureBrackets, requiresProcedureCallBrackets, requiresProcedureCallOuputToken, requiresTableInIndexDropDDL, requiresTypeNameToRegisterOutputParameter, requiresUniqueConstraintCreationOnTableCreate, retrieveFirstPrimaryKeyOrOne, rollbackTransaction, setCastSizeForVarcharParameter, setCursorCode, setIsCastRequired, setMaxBatchWritingSize, setParameterValueInDatabaseCall, setPartitioningCallback, setPingSQL, setPrintInnerJoinInWhereClause, setPrintOuterJoinInWhereClause, setSequenceCounterFieldName, setSequenceNameFieldName, setSequenceTableName, setShouldBindAllParameters, setShouldBindLiterals, setShouldCacheAllStatements, setShouldForceFieldNamesToUpperCase, setShouldIgnoreCaseOnFieldComparisons, setShouldOptimizeDataConversion, setShouldTrimStrings, setShouldUseRownumFiltering, setStatementCacheSize, setStringBindingSize, setSupportsAutoCommit, setTableCreationSuffix, setTransactionIsolation, setUsesBatchWriting, setUsesByteArrayBinding, setUsesJDBCBatchWriting, setUsesNativeBatchWriting, setUsesNativeSQL, setUsesStreamsForBinding, setUsesStringBinding, shouldAlwaysUseTempStorageForModifyAll, shouldBindAllParameters, shouldBindLiterals, shouldCacheAllStatements, shouldCreateIndicesForPrimaryKeys, shouldCreateIndicesOnUniqueKeys, shouldForceFieldNamesToUpperCase, shouldIgnoreCaseOnFieldComparisons, shouldIgnoreException, shouldOptimizeDataConversion, shouldPrintAliasForUpdate, shouldPrintConstraintNameAfter, shouldPrintFieldIdentityClause, shouldPrintInnerJoinInWhereClause, shouldPrintInOutputTokenBeforeType, shouldPrintInputTokenAtStart, shouldPrintLockingClauseAfterWhereClause, shouldPrintOuterJoinInWhereClause, shouldPrintOutputTokenAtStart, shouldPrintOutputTokenBeforeType, shouldPrintStoredProcedureArgumentNameInCall, shouldPrintStoredProcedureVariablesAfterBeginString, shouldTrimStrings, shouldUseCustomModifyForCall, shouldUseRownumFiltering, supportsANSIInnerJoinSyntax, supportsAutoCommit, supportsCountDistinctWithMultipleFields, supportsDeleteOnCascade, supportsForeignKeyConstraints, supportsGlobalTempTables, supportsIndexes, supportsIndividualTableLocking, supportsLocalTempTables, supportsLockingQueriesWithMultipleTables, supportsNestingOuterJoins, supportsOuterJoinsWithBrackets, supportsPrimaryKeyConstraint, supportsTempTables, supportsUniqueColumns, supportsUniqueKeyConstraints, usesBatchWriting, usesByteArrayBinding, usesJDBCBatchWriting, usesNativeBatchWriting, usesNativeSQL, usesSequenceTable, usesStreamsForBinding, usesStringBinding, writeCleanUpTempTableSql, writeCreateTempTableSql, writeDeleteFromTargetTableUsingTempTableSql, writeInsertIntoTableSql, writeLOB, writeParameterMarker, writeTableCreationSuffix, writeUpdateOriginalFromTempTableSql

Methods inherited from class org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

addSequence, addSequence, buildNativeCall, buildSelectQueryForIdentity, buildSelectQueryForSequenceObject, clone, convertObject, createConnectionCustomizer, getConversionManager, getDataTypesConvertedFrom, getDataTypesConvertedTo, getDefaultSequence, getDefaultSequenceToWrite, getEndDelimiter, getOperator, getPlatformOperators, getSelectSequenceQuery, getSequence, getSequences, getSequencesToWrite, getStartDelimiter, getTableQualifier, getTimestampFromServer, getUpdateSequenceQuery, hasDefaultSequence, initializeDefaultQueries, isAccess, isAttunity, isCloudscape, isDB2, isDBase, isDerby, isFirebird, isH2, isHSQL, isInformix, isMaxDB, isMySQL, isODBC, isOracle9, isPointBase, isPostgreSQL, isSQLAnywhere, isSQLServer, isSybase, isSymfoware, isTimesTen, isTimesTen7, removeAllSequences, removeSequence, setConversionManager, setDefaultSequence, setEndDelimiter, setSelectSequenceNumberQuery, setSequencePreallocationSize, setSequences, setStartDelimiter, setTableQualifier, setTimestampQuery, setUpdateSequenceQuery, shouldNativeSequenceUseTransaction, shouldPrepare, shouldSelectDistinctIncludeOrderBy, shouldSelectIncludeOrderBy, supportsNativeSequenceNumbers, toString, usesPlatformDefaultSequence

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

OraclePlatform

public OraclePlatform()

Method Detail

allowsSizeInProcedureArguments

public boolean allowsSizeInProcedureArguments()

Description copied from class: DatabasePlatform

Used for stored procedure definitions.

Overrides:

allowsSizeInProcedureArguments in class DatabasePlatform

atan2Operator

public ExpressionOperator atan2Operator()

INTERNAL: Build operator.

buildCallWithReturning

public DatabaseCall buildCallWithReturning(SQLCall sqlCall,
                                           java.util.Vector returnFields)

INTERNAL: Returns null unless the platform supports call with returning

Overrides:

buildCallWithReturning in class DatabasePlatform

canBuildCallWithReturning

public boolean canBuildCallWithReturning()

INTERNAL: Indicates whether the platform can build call with returning. In case this method returns true, buildCallWithReturning method may be called.

Overrides:

canBuildCallWithReturning in class DatabasePlatform

clearOracleConnectionCache

public void clearOracleConnectionCache(java.sql.Connection conn)

INTERNAL: Clears both implicit and explicit caches of OracleConnection on Oracle9Platform, noop here.

getAssignmentString

public java.lang.String getAssignmentString()

INTERNAL: Used for stored function calls.

Overrides:

getAssignmentString in class DatabasePlatform

getDeclareBeginString

public java.lang.String getDeclareBeginString()

INTERNAL: DECLARE stanza header for Anonymous PL/SQL block

getBatchBeginString

public java.lang.String getBatchBeginString()

Used for batch writing and sp defs.

Overrides:

getBatchBeginString in class DatabasePlatform

getBatchEndString

public java.lang.String getBatchEndString()

Used for batch writing and sp defs.

Overrides:

getBatchEndString in class DatabasePlatform

getMaxFieldNameSize

public int getMaxFieldNameSize()

INTERNAL: returns the maximum number of characters that can be used in a field name on this platform.

Overrides:

getMaxFieldNameSize in class DatabasePlatform

getNativeTableInfo

public java.util.Vector getNativeTableInfo(java.lang.String table,
                                           java.lang.String creator,
                                           AbstractSession session)

Return the catalog information through using the native SQL catalog selects. This is required because many JDBC driver do not support meta-data. Willcards can be passed as arguments.

getProcedureArgumentSetter

public java.lang.String getProcedureArgumentSetter()

Used for sp calls.

Overrides:

getProcedureArgumentSetter in class DatabasePlatform

getProcedureCallHeader

public java.lang.String getProcedureCallHeader()

Used for sp calls.

Overrides:

getProcedureCallHeader in class DatabasePlatform

getProcedureCallTail

public java.lang.String getProcedureCallTail()

Used for sp calls.

Overrides:

getProcedureCallTail in class DatabasePlatform

getSelectForUpdateString

public java.lang.String getSelectForUpdateString()

Description copied from class: DatabasePlatform

Most database support a syntax. although don't actually lock the row. Some require the OF some don't like it.

Overrides:

getSelectForUpdateString in class DatabasePlatform

getSelectForUpdateWaitString

public java.lang.String getSelectForUpdateWaitString(java.lang.Integer waitTimeout)

Description copied from class: DatabasePlatform

Platforms that support the WAIT option should override this method. By default the wait timeout is ignored.

Overrides:

getSelectForUpdateWaitString in class DatabasePlatform

getStoredProcedureParameterPrefix

public java.lang.String getStoredProcedureParameterPrefix()

Overrides:

getStoredProcedureParameterPrefix in class DatabasePlatform

getStoredProcedureTerminationToken

public java.lang.String getStoredProcedureTerminationToken()

Overrides:

getStoredProcedureTerminationToken in class DatabasePlatform

getSystemChangeNumberQuery

public ValueReadQuery getSystemChangeNumberQuery()

PUBLIC: The query to select the current system change number from Oracle. In order to execute this query a database administrator may need to grant execute permission on pl/sql package DBMS_FLASHBACK.

getTimestampQuery

public ValueReadQuery getTimestampQuery()

PUBLIC: This method returns the query to select the timestamp from the server for Oracle.

Specified by:

getTimestampQuery in interface Platform

Overrides:

getTimestampQuery in class DatasourcePlatform

getVPDClearIdentifierQuery

public DatabaseQuery getVPDClearIdentifierQuery(java.lang.String vpdIdentifier)

INTERNAL: Return an Oracle defined VPD clear identifier query.

Overrides:

getVPDClearIdentifierQuery in class DatabasePlatform

getVPDCreationFunctionString

public java.lang.String getVPDCreationFunctionString(java.lang.String tableName,
                                                     java.lang.String tenantFieldName)

INTERNAL: Return an Oracle defined VPD identifier function. Used for DDL generation.

Overrides:

getVPDCreationFunctionString in class DatabasePlatform

getVPDCreationPolicyString

public java.lang.String getVPDCreationPolicyString(java.lang.String tableName,
                                                   AbstractSession session)

INTERNAL: Return an Oracle defined VPD identifier policy. Used for DDL generation.

Overrides:

getVPDCreationPolicyString in class DatabasePlatform

getVPDDeletionString

public java.lang.String getVPDDeletionString(java.lang.String tableName,
                                             AbstractSession session)

INTERNAL: Return an Oracle defined VPD identifier policy deletion. Used for DDL generation.

Overrides:

getVPDDeletionString in class DatabasePlatform

getVPDSetIdentifierQuery

public DatabaseQuery getVPDSetIdentifierQuery(java.lang.String vpdIdentifier)

INTERNAL: Return an Oracle defined VPD set identifier query.

Overrides:

getVPDSetIdentifierQuery in class DatabasePlatform

getObjectFromResultSet

public java.lang.Object getObjectFromResultSet(java.sql.ResultSet resultSet,
                                               int columnNumber,
                                               int type,
                                               AbstractSession session)
                                        throws java.sql.SQLException

INTERNAL: Get a timestamp value from a result set. Overrides the default behavior to specifically return a timestamp. Added to overcome an issue with the oracle 9.0.1.4 JDBC driver.

Overrides:

getObjectFromResultSet in class DatabasePlatform

Throws:

java.sql.SQLException

See Also:

org.eclipse.persistence.oraclespecific.Oracle9Platform

exceptOperator

public static ExpressionOperator exceptOperator()

INTERNAL: Create the EXCEPT operator, MINUS in Oracle.

regexpOperator

public static ExpressionOperator regexpOperator()

INTERNAL: Create the REGEXP_LIKE operator.

isNativeConnectionRequiredForLobLocator

public boolean isNativeConnectionRequiredForLobLocator()

INTERNAL: Used by derived platforms (Oracle8Platform and higher) to indicate whether app. server should unwrap connection to use lob locator.

isOracle

public boolean isOracle()

Specified by:

isOracle in interface Platform

Overrides:

isOracle in class DatasourcePlatform

maximumNumericValues

public java.util.Hashtable maximumNumericValues()

Builds a table of maximum numeric values keyed on java class. This is used for type testing but might also be useful to end users attempting to sanitize values.

NOTE: BigInteger & BigDecimal maximums are dependent upon their precision & Scale

Overrides:

maximumNumericValues in class DatabasePlatform

minimumNumericValues

public java.util.Hashtable minimumNumericValues()

Builds a table of minimum numeric values keyed on java class. This is used for type testing but might also be useful to end users attempting to sanitize values.

NOTE: BigInteger & BigDecimal minimums are dependent upon their precision & Scale

Overrides:

minimumNumericValues in class DatabasePlatform

buildSelectQueryForSequenceObject

public ValueReadQuery buildSelectQueryForSequenceObject(java.lang.String qualifiedSeqName,
                                                        java.lang.Integer size)

INTERNAL: Produce a DataReadQuery which updates(!) the sequence number in the db and returns it. Currently implemented on Oracle only.

Overrides:

buildSelectQueryForSequenceObject in class DatasourcePlatform

Parameters:

qualifiedSeqName - known by Oracle to be a defined sequence

buildSelectQueryForIdentity

public ValueReadQuery buildSelectQueryForIdentity(java.lang.String qualifiedSeqName,
                                                  java.lang.Integer size)

INTERNAL: Though Oracle doesn't support identity it could be imitated, see comment to setSupportsIdentity method.

Overrides:

buildSelectQueryForIdentity in class DatasourcePlatform

Parameters:

qualifiedSeqName - known by Oracle to be a defined sequence

printFieldNullClause

public void printFieldNullClause(java.io.Writer writer)
                          throws ValidationException

INTERNAL: Append the receiver's field 'NULL' constraint clause to a writer.

Overrides:

printFieldNullClause in class DatabasePlatform

Throws:

ValidationException

serverTimestampString

public java.lang.String serverTimestampString()

Return the current date and time from the server.

shouldUseJDBCOuterJoinSyntax

public boolean shouldUseJDBCOuterJoinSyntax()

JDBC defines and outer join syntax, many drivers do not support this. So we normally avoid it.

Overrides:

shouldUseJDBCOuterJoinSyntax in class DatabasePlatform

supportsAutoConversionToNumericForArithmeticOperations

public boolean supportsAutoConversionToNumericForArithmeticOperations()

Some db allow VARCHAR db field to be used in arithmetic operations automatically converting them to numeric: UPDATE OL_PHONE SET PHONE_ORDER_VARCHAR = (PHONE_ORDER_VARCHAR + 1) WHERE ... SELECT ... WHERE ... t0.MANAGED_ORDER_VARCHAR BETWEEN 1 AND 4 ...

Overrides:

supportsAutoConversionToNumericForArithmeticOperations in class DatabasePlatform

supportsSequenceObjects

public boolean supportsSequenceObjects()

INTERNAL: Indicates whether the platform supports sequence objects. This method is to be used *ONLY* by sequencing classes

Overrides:

supportsSequenceObjects in class DatasourcePlatform

supportsIdentity

public boolean supportsIdentity()

INTERNAL: Indicates whether the platform supports identity. This method is to be used *ONLY* by sequencing classes

Overrides:

supportsIdentity in class DatasourcePlatform

setSupportsIdentity

public void setSupportsIdentity(boolean supportsIdentity)

ADVANCED: Oracle db doesn't support identity. However it's possible to get identity-like behavior using sequence in an insert trigger - that's the only case when supportsIdentity should be set to true: in this case all the sequences that have shouldAcquireValueAfterInsert set to true will keep this setting (it would've been reversed in case identity is not supported). Note that with supportsIdentity==true attempt to create tables that have identity fields will fail - Oracle doesn't support identity. Therefore if there's table creation reqiured it should be done with supportsIdentity==false, then set the flag to true and reset sequencing (or logout and login the session).

supportsStoredFunctions

public boolean supportsStoredFunctions()

INTERNAL: Return if database stored functions are supported.

Overrides:

supportsStoredFunctions in class DatabasePlatform

supportsVPD

public boolean supportsVPD()

Oracle db supports VPD.

Overrides:

supportsVPD in class DatabasePlatform

supportsSelectForUpdateNoWait

public boolean supportsSelectForUpdateNoWait()

Returns true if the database supports SQL syntax not to wait on a SELECT..FOR UPADTE (i.e. In Oracle adding NOWAIT to the end will accomplish this)

canUnwrapOracleConnection

public boolean canUnwrapOracleConnection()

INTERNAL: Indicates whether this Oracle platform can unwrap Oracle connection.

unwrapOracleConnection

public java.sql.Connection unwrapOracleConnection(java.sql.Connection connection)

INTERNAL: If can unwrap returns unwrapped Oracle connection, otherwise original connection.

printSQLSelectStatement

public void printSQLSelectStatement(DatabaseCall call,
                                    ExpressionSQLPrinter printer,
                                    SQLSelectStatement statement)

INTERNAL: Print the SQL representation of the statement on a stream, storing the fields in the DatabaseCall. This implementation works MaxRows and FirstResult into the SQL using Oracle's ROWNUM to filter values if shouldUseRownumFiltering is true.

Overrides:

printSQLSelectStatement in class DatabasePlatform

isAlterSequenceObjectSupported

public boolean isAlterSequenceObjectSupported()

INTERNAL: Override this method if the platform supports sequence objects and it's possible to alter sequence object's increment in the database.

Overrides:

isAlterSequenceObjectSupported in class DatabasePlatform

isForUpdateCompatibleWithDistinct

public boolean isForUpdateCompatibleWithDistinct()

INTERNAL: Indicates whether SELECT DISTINCT ... FOR UPDATE is allowed by the platform (Oracle doesn't allow this).

Overrides:

isForUpdateCompatibleWithDistinct in class DatabasePlatform

isLockTimeoutException

public boolean isLockTimeoutException(DatabaseException e)

Return true if the given exception occurred as a result of a lock time out exception (WAIT clause).

Overrides:

isLockTimeoutException in class DatabasePlatform

See Also:

OraclePlatform.

wasFailureCommunicationBased

public boolean wasFailureCommunicationBased(java.sql.SQLException exception,
                                            java.sql.Connection connection,
                                            AbstractSession sessionForProfile)

INTERNAL: A call to this method will perform a platform based check on the connection and exception error code to determine if the connection is still valid or if a communication error has occurred. If a communication error has occurred then the query may be retried. If this platform is unable to determine if the error was communication based it will return false forcing the error to be thrown to the user.

Overrides:

wasFailureCommunicationBased in class DatabasePlatform