org.eclipse.persistence.platform.database
Class DB2Platform

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.DB2Platform

All Implemented Interfaces:

Serializable, Cloneable, org.eclipse.persistence.internal.databaseaccess.Platform

Direct Known Subclasses:

DB2MainframePlatform, DerbyPlatform

public class DB2Platform
extends DatabasePlatform

Purpose: Provides DB2 specific behavior.

Responsibilities:

• Support for schema creation.
• Native SQL for byte[], Date, Time, & Timestamp.
• Support for table qualified names.
• Support for stored procedures.
• Support for temp tables.
• Support for casting.
• Support for database functions.
• Support for identity sequencing.
• Support for SEQUENCE sequencing.

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, Types_NCLOB

Constructor Summary

DB2Platform()

Method Summary

ValueReadQuery	buildSelectQueryForIdentity() INTERNAL: Build the identity query for native sequencing.
ValueReadQuery	buildSelectQueryForSequenceObject(String seqName, Integer size) INTERNAL: DB2 added SEQUENCE support as of (I believe) v8.
boolean	dontBindUpdateAllQueryUsingTempTables() INTERNAL: DB2 has issues with binding with temp table queries.
int	getMaxFieldNameSize() INTERNAL: returns the maximum number of characters that can be used in a field name on this platform.
int	getMaxForeignKeyNameSize() INTERNAL: returns the maximum number of characters that can be used in a foreign key name on this platform.
int	getMaxUniqueKeyNameSize() INTERNAL: returns the maximum number of characters that can be used in a unique key name on this platform.
Vector	getNativeTableInfo(String table, String creator, org.eclipse.persistence.internal.sessions.AbstractSession session) INTERNAL: Return the catalog information through using the native SQL catalog selects.
String	getProcedureAsString() INTERNAL: Used for stored procedure defs.
String	getProcedureBeginString() Used for stored procedure defs.
String	getProcedureCallHeader() INTERNAL: Used for sp calls.
String	getProcedureEndString() INTERNAL: Used for stored procedure defs.
String	getSelectForUpdateString() INTERNAL: Used for pessimistic locking in DB2.
org.eclipse.persistence.internal.helper.DatabaseTable	getTempTableForTable(org.eclipse.persistence.internal.helper.DatabaseTable table) INTERNAL: DB2 temp table syntax.
ValueReadQuery	getTimestampQuery() INTERNAL: This method returns the query to select the timestamp from the server for DB2.
boolean	isAlterSequenceObjectSupported() INTERNAL: DB2 added SEQUENCE support as of (I believe) v8.
boolean	isDB2()
boolean	isDynamicSQLRequiredForFunctions() INTERNAL DB2 has some issues with using parameters on certain functions and relations.
boolean	isNullAllowedInSelectClause() INTERNAL: DB2 does not allow NULL in select clause.
Hashtable	maximumNumericValues() INTERNAL: Builds a table of maximum numeric values keyed on java class.
Hashtable	minimumNumericValues() INTERNAL: Builds a table of minimum numeric values keyed on java class.
void	printFieldIdentityClause(Writer writer) INTERNAL: Append the receiver's field 'identity' constraint clause to a writer.
void	printSQLSelectStatement(org.eclipse.persistence.internal.databaseaccess.DatabaseCall call, org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer, org.eclipse.persistence.internal.expressions.SQLSelectStatement statement) INTERNAL: Print the SQL representation of the statement on a stream, storing the fields in the DatabaseCall.
boolean	shouldIgnoreException(SQLException exception) INTERNAL: Allow for the platform to ignore exceptions.
boolean	shouldPrintOutputTokenAtStart() INTERNAL: This is required in the construction of the stored procedures with output parameters.
boolean	shouldUseJDBCOuterJoinSyntax() INTERNAL: JDBC defines and outer join syntax, many drivers do not support this.
boolean	supportsGlobalTempTables() INTERNAL: DB2 supports temp tables.
boolean	supportsIdentity() INTERNAL: Indicates whether the platform supports identity.
boolean	supportsLockingQueriesWithMultipleTables() INTERNAL: DB2 does not seem to allow FOR UPDATE on queries with multiple tables.
boolean	supportsSequenceObjects() INTERNAL: DB2 added SEQUENCE support as of (I believe) v8.
void	writeParameterMarker(Writer writer, org.eclipse.persistence.internal.expressions.ParameterExpression parameter, org.eclipse.persistence.internal.sessions.AbstractRecord record, org.eclipse.persistence.internal.databaseaccess.DatabaseCall call) INTERNAL: DB2 requires casting on certain operations, such as the CONCAT function, and parameterized queries of the form, ":param = :param".

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

addBatch, addStructConverter, allowsSizeInProcedureArguments, appendLiteralToCall, appendParameter, appendParameterInternal, autoCommit, beginTransaction, buildCallWithReturning, buildCreateIndex, buildDropIndex, buildProcedureCallString, buildSelectQueryForIdentity, buildSelectQueryForSequenceObject, buildSequenceObjectAlterIncrementWriter, buildSequenceObjectCreationWriter, buildSequenceObjectDeletionWriter, canBatchWriteWithOptimisticLocking, canBuildCallWithReturning, commitTransaction, computeMaxRowsForSQL, convertToDatabaseType, copyInto, createArray, createArray, createStruct, createStruct, executeBatch, executeStoredProcedure, freeTemporaryObject, getAssignmentString, getBatchBeginString, getBatchDelimiterString, getBatchEndString, getCastSizeForVarcharParameter, getClassTypes, getConnection, getConstraintDeletionString, getCreateViewString, getCreationInOutputProcedureToken, getCreationOutputProcedureToken, getCursorCode, getCustomModifyValueForCall, getDefaultSequenceTableName, getFieldTypeDefinition, getFieldTypes, getFunctionCallHeader, getIdentifierQuoteCharacter, getInOutputProcedureToken, getInputProcedureToken, getJDBCOuterJoinString, getJDBCType, getJDBCType, getJdbcTypeName, getMaxBatchWritingSize, getMaxIndexNameSize, getNoWaitString, getObjectFromResultSet, getOutputProcedureToken, getPingSQL, getProcedureArgumentSetter, getProcedureArgumentString, getProcedureCallTail, getQualifiedName, getQualifiedSequenceTableName, getRefValue, getRefValue, getSelectForUpdateNoWaitString, getSelectForUpdateOfString, getSelectForUpdateWaitString, getSequenceCounterFieldName, getSequenceNameFieldName, getSequencePreallocationSize, getSequenceTableName, getStatementCacheSize, getStoredProcedureParameterPrefix, getStoredProcedureTerminationToken, getStringBindingSize, getStructConverters, getTransactionIsolation, getTypeConverters, initialize, isCastRequired, isForUpdateCompatibleWithDistinct, isInformixOuterJoin, isLockTimeoutException, isXDBDocument, prepareBatchStatement, printFieldNotNullClause, printFieldNullClause, printFieldTypeSize, printFieldUnique, printValuelist, printValuelist, registerOutputParameter, requiresNamedPrimaryKeyConstraints, requiresProcedureBrackets, requiresProcedureCallBrackets, requiresProcedureCallOuputToken, requiresTypeNameToRegisterOutputParameter, requiresUniqueConstraintCreationOnTableCreate, rollbackTransaction, setCastSizeForVarcharParameter, setCursorCode, setIsCastRequired, setMaxBatchWritingSize, setParameterValueInDatabaseCall, setPingSQL, setPrintOuterJoinInWhereClause, setSequenceCounterFieldName, setSequenceNameFieldName, setSequenceTableName, setShouldBindAllParameters, setShouldBindLiterals, setShouldCacheAllStatements, setShouldForceFieldNamesToUpperCase, setShouldIgnoreCaseOnFieldComparisons, setShouldOptimizeDataConversion, setShouldTrimStrings, setShouldUseRownumFiltering, setStatementCacheSize, setStringBindingSize, setSupportsAutoCommit, setTransactionIsolation, setUsesBatchWriting, setUsesByteArrayBinding, setUsesJDBCBatchWriting, setUsesNativeBatchWriting, setUsesNativeSQL, setUsesStreamsForBinding, setUsesStringBinding, shouldAlwaysUseTempStorageForModifyAll, shouldBindAllParameters, shouldBindLiterals, shouldCacheAllStatements, shouldCreateIndicesForPrimaryKeys, shouldCreateIndicesOnUniqueKeys, shouldForceFieldNamesToUpperCase, shouldIgnoreCaseOnFieldComparisons, shouldNativeSequenceUseTransaction, shouldOptimizeDataConversion, shouldPrintAliasForUpdate, shouldPrintConstraintNameAfter, shouldPrintFieldIdentityClause, shouldPrintInOutputTokenBeforeType, shouldPrintInputTokenAtStart, shouldPrintLockingClauseAfterWhereClause, shouldPrintOuterJoinInWhereClause, shouldPrintOutputTokenBeforeType, shouldPrintStoredProcedureArgumentNameInCall, shouldPrintStoredProcedureVariablesAfterBeginString, shouldTrimStrings, shouldUseCustomModifyForCall, shouldUseRownumFiltering, supportsANSIInnerJoinSyntax, supportsAutoCommit, supportsAutoConversionToNumericForArithmeticOperations, supportsForeignKeyConstraints, supportsIndividualTableLocking, supportsLocalTempTables, supportsNativeSequenceNumbers, supportsNestingOuterJoins, supportsOuterJoinsWithBrackets, supportsPrimaryKeyConstraint, supportsStoredFunctions, supportsTempTables, supportsUniqueColumns, supportsUniqueKeyConstraints, usesBatchWriting, usesByteArrayBinding, usesJDBCBatchWriting, usesNativeBatchWriting, usesNativeSQL, usesSequenceTable, usesStreamsForBinding, usesStringBinding, wasFailureCommunicationBased, writeCleanUpTempTableSql, writeCreateTempTableSql, writeDeleteFromTargetTableUsingTempTableSql, writeInsertIntoTableSql, writeLOB, writeUpdateOriginalFromTempTableSql

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DB2Platform

public DB2Platform()

Method Detail

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 org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getMaxForeignKeyNameSize

public int getMaxForeignKeyNameSize()

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

Overrides:

getMaxForeignKeyNameSize in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getMaxUniqueKeyNameSize

public int getMaxUniqueKeyNameSize()

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

Overrides:

getMaxUniqueKeyNameSize in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getNativeTableInfo

public Vector getNativeTableInfo(String table,
                                 String creator,
                                 org.eclipse.persistence.internal.sessions.AbstractSession session)

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

getProcedureCallHeader

public String getProcedureCallHeader()

INTERNAL: Used for sp calls.

Overrides:

getProcedureCallHeader in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getSelectForUpdateString

public String getSelectForUpdateString()

INTERNAL: Used for pessimistic locking in DB2. Without the "WITH RS" the lock is not held.

Overrides:

getSelectForUpdateString in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getProcedureEndString

public String getProcedureEndString()

INTERNAL: Used for stored procedure defs.

Overrides:

getProcedureEndString in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getProcedureBeginString

public String getProcedureBeginString()

Used for stored procedure defs.

Overrides:

getProcedureBeginString in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getProcedureAsString

public String getProcedureAsString()

INTERNAL: Used for stored procedure defs.

Overrides:

getProcedureAsString in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

shouldPrintOutputTokenAtStart

public boolean shouldPrintOutputTokenAtStart()

INTERNAL: This is required in the construction of the stored procedures with output parameters.

Overrides:

shouldPrintOutputTokenAtStart in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getTimestampQuery

public ValueReadQuery getTimestampQuery()

INTERNAL: This method returns the query to select the timestamp from the server for DB2.

Specified by:

getTimestampQuery in interface org.eclipse.persistence.internal.databaseaccess.Platform

Overrides:

getTimestampQuery in class org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

isDB2

public boolean isDB2()

Specified by:

isDB2 in interface org.eclipse.persistence.internal.databaseaccess.Platform

Overrides:

isDB2 in class org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform

maximumNumericValues

public Hashtable maximumNumericValues()

INTERNAL: 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 org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

minimumNumericValues

public Hashtable minimumNumericValues()

INTERNAL: 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 org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

shouldIgnoreException

public boolean shouldIgnoreException(SQLException exception)

INTERNAL: Allow for the platform to ignore exceptions. This is required for DB2 which throws no-data modified as an exception.

Overrides:

shouldIgnoreException in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

shouldUseJDBCOuterJoinSyntax

public boolean shouldUseJDBCOuterJoinSyntax()

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

Overrides:

shouldUseJDBCOuterJoinSyntax in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

buildSelectQueryForIdentity

public ValueReadQuery buildSelectQueryForIdentity()

INTERNAL: Build the identity query for native sequencing.

Overrides:

buildSelectQueryForIdentity in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

printFieldIdentityClause

public void printFieldIdentityClause(Writer writer)
                              throws ValidationException

INTERNAL: Append the receiver's field 'identity' constraint clause to a writer. Used by table creation with sequencing.

Overrides:

printFieldIdentityClause in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

ValidationException

supportsIdentity

public boolean supportsIdentity()

INTERNAL: Indicates whether the platform supports identity. DB2 does through AS IDENTITY field types. This is used by sequencing.

Overrides:

supportsIdentity in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

supportsGlobalTempTables

public boolean supportsGlobalTempTables()

INTERNAL: DB2 supports temp tables. This is used by UpdateAllQuerys.

Overrides:

supportsGlobalTempTables in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

getTempTableForTable

public org.eclipse.persistence.internal.helper.DatabaseTable getTempTableForTable(org.eclipse.persistence.internal.helper.DatabaseTable table)

INTERNAL: DB2 temp table syntax. This is used by UpdateAllQuerys.

Overrides:

getTempTableForTable in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Returns:

DatabaseTable temorary table

dontBindUpdateAllQueryUsingTempTables

public boolean dontBindUpdateAllQueryUsingTempTables()

INTERNAL: DB2 has issues with binding with temp table queries. This is used by UpdateAllQuerys.

Overrides:

dontBindUpdateAllQueryUsingTempTables in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

isNullAllowedInSelectClause

public boolean isNullAllowedInSelectClause()

INTERNAL: DB2 does not allow NULL in select clause. This is used by UpdateAllQuerys.

Overrides:

isNullAllowedInSelectClause in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

isDynamicSQLRequiredForFunctions

public boolean isDynamicSQLRequiredForFunctions()

INTERNAL DB2 has some issues with using parameters on certain functions and relations. This allows statements to disable binding only in these cases. If users set casting on, then casting is used instead of dynamic SQL.

Overrides:

isDynamicSQLRequiredForFunctions in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

writeParameterMarker

public void writeParameterMarker(Writer writer,
                                 org.eclipse.persistence.internal.expressions.ParameterExpression parameter,
                                 org.eclipse.persistence.internal.sessions.AbstractRecord record,
                                 org.eclipse.persistence.internal.databaseaccess.DatabaseCall call)
                          throws IOException

INTERNAL: DB2 requires casting on certain operations, such as the CONCAT function, and parameterized queries of the form, ":param = :param". This method will write CAST operation to parameters if the type is known. This is not used by default, only if isCastRequired is set to true, by default dynamic SQL is used to avoid the issue in only the required cases.

Overrides:

writeParameterMarker in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

Throws:

IOException

supportsLockingQueriesWithMultipleTables

public boolean supportsLockingQueriesWithMultipleTables()

INTERNAL: DB2 does not seem to allow FOR UPDATE on queries with multiple tables. This is only used by testing to exclude these tests.

Overrides:

supportsLockingQueriesWithMultipleTables in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

buildSelectQueryForSequenceObject

public ValueReadQuery buildSelectQueryForSequenceObject(String seqName,
                                                        Integer size)

INTERNAL: DB2 added SEQUENCE support as of (I believe) v8.

Overrides:

buildSelectQueryForSequenceObject in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

supportsSequenceObjects

public boolean supportsSequenceObjects()

INTERNAL: DB2 added SEQUENCE support as of (I believe) v8.

Overrides:

supportsSequenceObjects in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

isAlterSequenceObjectSupported

public boolean isAlterSequenceObjectSupported()

INTERNAL: DB2 added SEQUENCE support as of (I believe) v8.

Overrides:

isAlterSequenceObjectSupported in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform

printSQLSelectStatement

public void printSQLSelectStatement(org.eclipse.persistence.internal.databaseaccess.DatabaseCall call,
                                    org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer,
                                    org.eclipse.persistence.internal.expressions.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 DB2's ROWNUMBER() OVER() to filter values if shouldUseRownumFiltering is true.

Overrides:

printSQLSelectStatement in class org.eclipse.persistence.internal.databaseaccess.DatabasePlatform