org.hibernate.dialect
Class DerbyDialect

java.lang.Object
  org.hibernate.dialect.Dialect
      org.hibernate.dialect.DB2Dialect
          org.hibernate.dialect.DerbyDialect

public class DerbyDialect
extends DB2Dialect

Author:

Simon Johnston Hibernate Dialect for Cloudscape 10 - aka Derby. This implements both an override for the identity column generator as well as for the case statement issue documented at: http://www.jroller.com/comments/kenlars99/Weblog/cloudscape_soon_to_be_derby

Nested Class Summary

static class

DerbyDialect.DerbyTrimFunctionEmulation A specialized function template to emulate the ANSI trim function on Derby DB since it does not support the full trim specification.

Field Summary

Fields inherited from class org.hibernate.dialect.Dialect

CLOSED_QUOTE, DEFAULT_BATCH_SIZE, NO_BATCH, QUOTE

Constructor Summary

DerbyDialect()

Method Summary

CaseFragment	createCaseFragment() Return the case statement modified for Cloudscape.
boolean	dropConstraints() Do we need to drop constraints before dropping tables in this dialect?
String	getIdentityColumnString() This is different in Cloudscape to DB2.
Class	getNativeIdentifierGeneratorClass() The class (which implements IdentifierGenerator) which acts as this dialects native generation strategy.
String	getQuerySequencesString() Get the select command used retrieve the names of all sequences.
boolean	supportsLimit() Does this dialect support some form of limiting query results via a SQL clause?
boolean	supportsLimitOffset() Does this dialect's LIMIT support (if any) additionally support specifying an offset?
boolean	supportsLobValueChangePropogation() Does the dialect support propogating changes to LOB values back to the database? Talking about mutating the internal value of the locator as opposed to supplying a new locator instance...
boolean	supportsSequences() Does this dialect support sequences?

Methods inherited from class org.hibernate.dialect.DB2Dialect

generateTemporaryTableName, getAddColumnString, getCreateSequenceString, getCreateTemporaryTablePostfix, getCreateTemporaryTableString, getCurrentTimestampSelectString, getDropSequenceString, getForUpdateString, getIdentityInsertString, getIdentitySelectString, getLimitString, getLowercaseFunction, getResultSet, getSelectClauseNullString, getSequenceNextValString, isCurrentTimestampSelectStringCallable, main, registerResultSetOutParameter, supportsCommentOn, supportsCurrentTimestampSelection, supportsEmptyInList, supportsIdentityColumns, supportsNotNullUnique, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsTemporaryTables, supportsUnionAll, useMaxForLimit

Methods inherited from class org.hibernate.dialect.Dialect

appendIdentitySelectToInsert, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildSQLExceptionConverter, closeQuote, createOuterJoinFragment, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, dropTemporaryTableAfterUse, forUpdateOfColumns, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getCascadeConstraintsString, getCastTypeName, getColumnComment, getCreateMultisetTableString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCurrentTimestampSQLFunctionName, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceStrings, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentitySelectString, getKeywords, getLimitString, getLockingStrategy, getMaxAliasLength, getNoColumnsInsertString, getNullColumnString, getSelectGUIDString, getSelectSequenceNextValString, getTableComment, getTableTypeString, getTypeName, getTypeName, getViolatedConstraintNameExtracter, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, openQuote, performTemporaryTableDDLInIsolation, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsUnboundedLobLocatorMaterialization, supportsUnique, supportsUniqueConstraintInCreateAlterTable, supportsVariableLimit, toBooleanValueString, toString, transformSelectString, useInputStreamToInsertBlob

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DerbyDialect

public DerbyDialect()

Method Detail

getIdentityColumnString

public String getIdentityColumnString()

This is different in Cloudscape to DB2.

Overrides:

getIdentityColumnString in class DB2Dialect

Returns:

The appropriate DDL fragment.

createCaseFragment

public CaseFragment createCaseFragment()

Return the case statement modified for Cloudscape.

Overrides:

createCaseFragment in class Dialect

Returns:

This dialect's CaseFragment strategy.

dropConstraints

public boolean dropConstraints()

Description copied from class: Dialect

Do we need to drop constraints before dropping tables in this dialect?

Overrides:

dropConstraints in class DB2Dialect

Returns:

True if constraints must be dropped prior to dropping the table; false otherwise.

getNativeIdentifierGeneratorClass

public Class getNativeIdentifierGeneratorClass()

Description copied from class: Dialect

The class (which implements IdentifierGenerator) which acts as this dialects native generation strategy.

Comes into play whenever the user specifies the native generator.

Overrides:

getNativeIdentifierGeneratorClass in class Dialect

Returns:

The native generator class.

supportsSequences

public boolean supportsSequences()

Description copied from class: Dialect

Does this dialect support sequences?

Overrides:

supportsSequences in class DB2Dialect

Returns:

True if sequences supported; false otherwise.

supportsLimit

public boolean supportsLimit()

Description copied from class: Dialect

Does this dialect support some form of limiting query results via a SQL clause?

Overrides:

supportsLimit in class DB2Dialect

Returns:

True if this dialect supports some form of LIMIT.

supportsLimitOffset

public boolean supportsLimitOffset()

Description copied from class: Dialect

Does this dialect's LIMIT support (if any) additionally support specifying an offset?

Overrides:

supportsLimitOffset in class Dialect

Returns:

True if the dialect supports an offset within the limit support.

getQuerySequencesString

public String getQuerySequencesString()

Description copied from class: Dialect

Get the select command used retrieve the names of all sequences.

Overrides:

getQuerySequencesString in class DB2Dialect

Returns:

The select command; or null if sequences are not supported.

See Also:

SchemaUpdate

supportsLobValueChangePropogation

public boolean supportsLobValueChangePropogation()

Description copied from class: Dialect

Does the dialect support propogating changes to LOB values back to the database? Talking about mutating the internal value of the locator as opposed to supplying a new locator instance...

For BLOBs, the internal value might be changed by: Blob.setBinaryStream(long), Blob.setBytes(long, byte[]), Blob.setBytes(long, byte[], int, int), or Blob.truncate(long).

For CLOBs, the internal value might be changed by: Clob.setAsciiStream(long), Clob.setCharacterStream(long), Clob.setString(long, String), Clob.setString(long, String, int, int), or Clob.truncate(long).

NOTE : I do not know the correct answer currently for databases which (1) are not part of the cruise control process or (2) do not Dialect.supportsExpectedLobUsagePattern().

Overrides:

supportsLobValueChangePropogation in class Dialect

Returns:

True if the changes are propogated back to the database; false otherwise.