org.hibernate.dialect

Class Ingres9Dialect

java.lang.Object

org.hibernate.dialect.Dialect

org.hibernate.dialect.IngresDialect

org.hibernate.dialect.Ingres9Dialect

All Implemented Interfaces:

ConversionContext

Direct Known Subclasses:

Ingres10Dialect

public class Ingres9Dialect
extends IngresDialect

A SQL dialect for Ingres 9.3 and later versions.

Changes:

• Support for the SQL functions current_time, current_timestamp and current_date added
• Type mapping of Types.TIMESTAMP changed from "timestamp with time zone" to "timestamp(9) with time zone"
• Improved handling of "SELECT...FOR UPDATE" statements
• Added support for pooled sequences
• Added support for SELECT queries with limit and offset
• Added getIdentitySelectString
• Modified concatination operator

Author:

Enrico Schenk, Raymond Fan

Field Summary

Fields inherited from class org.hibernate.dialect.Dialect

CLOSED_QUOTE, DEFAULT_BATCH_SIZE, LEGACY_LOB_MERGE_STRATEGY, NEW_LOCATOR_LOB_MERGE_STRATEGY, NO_BATCH, QUOTE, STREAM_XFER_LOB_MERGE_STRATEGY

Constructor Summary

Constructors

Constructor and Description
Ingres9Dialect()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	doesReadCommittedCauseWritersToBlockReaders() For the underlying database, is READ_COMMITTED isolation implemented by forcing readers to wait for write locks to be released?
boolean	doesRepeatableReadCauseReadersToBlockWriters() For the underlying database, is REPEATABLE_READ isolation implemented by forcing writers to wait for read locks to be released?
boolean	forUpdateOfColumns() Is FOR UPDATE OF syntax supported?
String	getCurrentTimestampSelectString() Retrieve the command used to retrieve the current timestammp from the database.
String	getCurrentTimestampSQLFunctionName() Expression for current_timestamp
String	getIdentitySelectString() Get the select command used to retrieve the last generated sequence value.
String	getLimitString(String querySelect, int offset, int limit) Add a LIMIT clause to the given SQL SELECT
String	getQuerySequencesString() Get the select command used retrieve the names of all sequences.
boolean	isCurrentTimestampSelectStringCallable() Should the value returned by getCurrentTimestampSelectString() be treated as callable.
protected void	registerDateTimeColumnTypes() Register column types date, time, timestamp
protected void	registerDateTimeFunctions() Register functions current_time, current_timestamp, current_date
boolean	supportsCurrentTimestampSelection() Does this dialect support a way to retrieve the database's current timestamp value?
boolean	supportsLimitOffset() Does this dialect's LIMIT support (if any) additionally support specifying an offset?
boolean	supportsOuterJoinForUpdate() Does this dialect support FOR UPDATE in conjunction with outer joined rows?
boolean	supportsPooledSequences() Does this dialect support "pooled" sequences.
boolean	supportsUnionAll() Does this dialect support UNION ALL, which is generally a faster variant of UNION?
boolean	supportsVariableLimit() Does this dialect support bind variables (i.e., prepared statememnt parameters) for its limit/offset?
boolean	useMaxForLimit() Does the LIMIT clause take a "maximum" row number instead of a total number of returned rows?

Methods inherited from class org.hibernate.dialect.IngresDialect

dropConstraints, generateTemporaryTableName, getAddColumnString, getCreateSequenceString, getCreateTemporaryTablePostfix, getCreateTemporaryTableString, getDropSequenceString, getLowercaseFunction, getNullColumnString, getSelectGUIDString, getSelectSequenceNextValString, getSequenceNextValString, supportsEmptyInList, supportsExpectedLobUsagePattern, supportsForUpdateOf, supportsLimit, supportsSequences, supportsSubselectAsInPredicateLHS, supportsTemporaryTables, supportsTupleDistinctCounts

Methods inherited from class org.hibernate.dialect.Dialect

appendIdentitySelectToInsert, appendLockHint, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildLimitHandler, buildSQLExceptionConversionDelegate, buildSQLExceptionConverter, cast, cast, cast, closeQuote, contributeTypes, convertToFirstRowValue, createCaseFragment, createOuterJoinFragment, dropTemporaryTableAfterUse, forceLimitUsage, forceLobAsLastValue, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAddUniqueConstraintString, getCascadeConstraintsString, getCaseInsensitiveLike, getCastTypeName, getColumnAliasExtractor, getColumnComment, getCreateMultisetTableString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCrossJoinSeparator, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceStrings, getDropTableString, getDropTemporaryTableString, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentityColumnString, getIdentityInsertString, getIdentitySelectString, getInExpressionCountLimit, getKeywords, getLimitString, getLobMergeStrategy, getLockingStrategy, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getNotExpression, getReadLockString, getResultSet, getSelectClauseNullString, getSqlTypeDescriptorOverride, getTableComment, getTableTypeString, getTypeName, getTypeName, getUniqueDelegate, getViolatedConstraintNameExtracter, getWriteLockString, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, isLockTimeoutParameterized, openQuote, performTemporaryTableDDLInIsolation, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, remapSqlTypeDescriptor, renderOrderByElement, replaceResultVariableInOrderByClauseWithPosition, requiresCastingOfParametersInSelectClause, requiresParensForTupleDistinctCounts, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsCommentOn, supportsExistsInSelect, supportsIdentityColumns, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLobValueChangePropogation, supportsLockTimeouts, supportsNotNullUnique, supportsParametersInInsertSelect, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsTableCheck, supportsTupleCounts, supportsTuplesInSubqueries, supportsUnboundedLobLocatorMaterialization, supportsUnique, supportsUniqueConstraintInCreateAlterTable, toBooleanValueString, toString, transformSelectString, useFollowOnLocking, useInputStreamToInsertBlob

Methods inherited from class java.lang.Object

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

Constructor Detail

Ingres9Dialect

public Ingres9Dialect()

Method Detail

registerDateTimeFunctions

protected void registerDateTimeFunctions()

Register functions current_time, current_timestamp, current_date

registerDateTimeColumnTypes

protected void registerDateTimeColumnTypes()

Register column types date, time, timestamp

supportsOuterJoinForUpdate

public boolean supportsOuterJoinForUpdate()

Does this dialect support FOR UPDATE in conjunction with outer joined rows?

Overrides:

supportsOuterJoinForUpdate in class Dialect

Returns:

True if outer joined rows can be locked via FOR UPDATE.

forUpdateOfColumns

public boolean forUpdateOfColumns()

Is FOR UPDATE OF syntax supported?

Overrides:

forUpdateOfColumns in class Dialect

Returns:

True if the database supports FOR UPDATE OF syntax; false otherwise.

getIdentitySelectString

public String getIdentitySelectString()

Get the select command used to retrieve the last generated sequence value.

Overrides:

getIdentitySelectString in class Dialect

Returns:

Statement to retrieve last generated sequence value

getQuerySequencesString

public String getQuerySequencesString()

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

Overrides:

getQuerySequencesString in class IngresDialect

Returns:

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

See Also:

SchemaUpdate

supportsPooledSequences

public boolean supportsPooledSequences()

Does this dialect support "pooled" sequences. Not aware of a better name for this. Essentially can we specify the initial and increment values?

Overrides:

supportsPooledSequences in class Dialect

Returns:

True if such "pooled" sequences are supported; false otherwise.

See Also:

Dialect.getCreateSequenceStrings(String, int, int), Dialect.getCreateSequenceString(String, int, int)

isCurrentTimestampSelectStringCallable

public boolean isCurrentTimestampSelectStringCallable()

Should the value returned by getCurrentTimestampSelectString() be treated as callable. Typically this indicates that JDBC escape sytnax is being used...

Overrides:

isCurrentTimestampSelectStringCallable in class Dialect

Returns:

True if the getCurrentTimestampSelectString() return is callable; false otherwise.

supportsCurrentTimestampSelection

public boolean supportsCurrentTimestampSelection()

Does this dialect support a way to retrieve the database's current timestamp value?

Overrides:

supportsCurrentTimestampSelection in class Dialect

Returns:

True if the current timestamp can be retrieved; false otherwise.

getCurrentTimestampSelectString

public String getCurrentTimestampSelectString()

Retrieve the command used to retrieve the current timestammp from the database.

Overrides:

getCurrentTimestampSelectString in class Dialect

Returns:

The command.

getCurrentTimestampSQLFunctionName

public String getCurrentTimestampSQLFunctionName()

Expression for current_timestamp

Overrides:

getCurrentTimestampSQLFunctionName in class IngresDialect

Returns:

The function name.

supportsUnionAll

public boolean supportsUnionAll()

Does this dialect support UNION ALL, which is generally a faster variant of UNION?

Overrides:

supportsUnionAll in class Dialect

Returns:

True if UNION ALL is supported; false otherwise.

doesReadCommittedCauseWritersToBlockReaders

public boolean doesReadCommittedCauseWritersToBlockReaders()

For the underlying database, is READ_COMMITTED isolation implemented by forcing readers to wait for write locks to be released?

Overrides:

doesReadCommittedCauseWritersToBlockReaders in class Dialect

Returns:

true

doesRepeatableReadCauseReadersToBlockWriters

public boolean doesRepeatableReadCauseReadersToBlockWriters()

For the underlying database, is REPEATABLE_READ isolation implemented by forcing writers to wait for read locks to be released?

Overrides:

doesRepeatableReadCauseReadersToBlockWriters in class Dialect

Returns:

true

supportsLimitOffset

public boolean supportsLimitOffset()

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

Overrides:

supportsLimitOffset in class IngresDialect

Returns:

true

supportsVariableLimit

public boolean supportsVariableLimit()

Does this dialect support bind variables (i.e., prepared statememnt parameters) for its limit/offset?

Overrides:

supportsVariableLimit in class IngresDialect

Returns:

false

useMaxForLimit

public boolean useMaxForLimit()

Does the LIMIT clause take a "maximum" row number instead of a total number of returned rows?

Overrides:

useMaxForLimit in class IngresDialect

Returns:

True if limit is relative from offset; false otherwise.

getLimitString

public String getLimitString(String querySelect,
                    int offset,
                    int limit)

Add a LIMIT clause to the given SQL SELECT

Overrides:

getLimitString in class IngresDialect

Parameters:

querySelect - The query to which to apply the limit.

offset - The offset of the limit

limit - The limit of the limit ;)

Returns:

the modified SQL