org.hibernate.dialect

Class IngresDialect

java.lang.Object

org.hibernate.dialect.Dialect

org.hibernate.dialect.IngresDialect

All Implemented Interfaces:

ConversionContext

Direct Known Subclasses:

Ingres9Dialect

public class IngresDialect
extends Dialect

An SQL dialect for Ingres 9.2.

Known limitations:

• Only supports simple constants or columns on the left side of an IN, making (1,2,3) in (...) or (subselect) in (...) non-supported.
• Supports only 39 digits in decimal.
• Explicitly set USE_GET_GENERATED_KEYS property to false.
• Perform string casts to varchar; removes space padding.

Author:

Ian Booth, Bruce Lunsford, Max Rydahl Andersen, 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, STANDARD_DEFAULT_BATCH_LOAD_SIZING_STRATEGY, STREAM_XFER_LOB_MERGE_STRATEGY

Constructor Summary

Constructors

Constructor and Description
IngresDialect() Constructs a IngresDialect

Method Summary

Modifier and Type	Method and Description
boolean	dropConstraints() Do we need to drop constraints before dropping tables in this dialect?
String	getAddColumnString() The syntax used to add a column to a table (optional).
String	getCreateSequenceString(String sequenceName) Typically dialects which support sequences can create a sequence with a single command.
String	getCurrentTimestampSQLFunctionName() The name of the database-specific SQL function for retrieving the current timestamp.
MultiTableBulkIdStrategy	getDefaultMultiTableBulkIdStrategy()
String	getDropSequenceString(String sequenceName) Typically dialects which support sequences can drop a sequence with a single command.
LimitHandler	getLimitHandler() Returns the delegate managing LIMIT clause.
String	getLimitString(String querySelect, int offset, int limit) Given a limit and an offset, apply the limit clause to the query.
String	getLowercaseFunction() The name of the SQL function that transforms a string to lowercase
String	getNullColumnString() The keyword used to specify a nullable column.
String	getQuerySequencesString() Get the select command used retrieve the names of all sequences.
String	getSelectGUIDString() Get the command used to select a GUID from the underlying database.
String	getSelectSequenceNextValString(String sequenceName) Generate the select expression fragment that will retrieve the next value of a sequence as part of another (typically DML) statement.
String	getSequenceNextValString(String sequenceName) Generate the appropriate select statement to to retrieve the next value of a sequence.
boolean	supportsEmptyInList() Does this dialect support empty IN lists? For example, is [where XYZ in ()] a supported construct?
boolean	supportsExpectedLobUsagePattern() Expected LOB usage pattern is such that I can perform an insert via prepared statement with a parameter binding for a LOB value without crazy casting to JDBC driver implementation-specific classes...
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	supportsSequences() Does this dialect support sequences?
boolean	supportsSubselectAsInPredicateLHS() Are subselects supported as the left-hand-side (LHS) of IN-predicates.
boolean	supportsTupleDistinctCounts() Does this dialect support `count(distinct a,b)`?
boolean	supportsVariableLimit() Does this dialect support bind variables (i.e., prepared statement parameters) for its limit/offset?
boolean	useMaxForLimit() Does the LIMIT clause take a "maximum" row number instead of a total number of returned rows? This is easiest understood via an example.

Methods inherited from class org.hibernate.dialect.Dialect

appendLockHint, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildIdentifierHelper, buildSQLExceptionConversionDelegate, buildSQLExceptionConverter, canCreateCatalog, canCreateSchema, cast, cast, cast, closeQuote, contributeTypes, convertToFirstRowValue, createCaseFragment, createOuterJoinFragment, defaultScrollMode, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, forceLimitUsage, forceLobAsLastValue, forUpdateOfColumns, getAddColumnSuffixString, getAddForeignKeyConstraintString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAddUniqueConstraintString, getAuxiliaryDatabaseObjectExporter, getCallableStatementSupport, getCascadeConstraintsString, getCaseInsensitiveLike, getCastTypeName, getColumnAliasExtractor, getColumnComment, getCreateCatalogCommand, getCreateMultisetTableString, getCreateSchemaCommand, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCrossJoinSeparator, getCurrentSchemaCommand, getCurrentTimestampSelectString, getDefaultBatchLoadSizingStrategy, getDefaultProperties, getDialect, getDialect, getDropCatalogCommand, getDropForeignKeyString, getDropSchemaCommand, getDropSequenceStrings, getDropTableString, getForeignKeyExporter, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateSkipLockedString, getForUpdateSkipLockedString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnSupport, getIndexExporter, getInExpressionCountLimit, getKeywords, getLimitString, getLobMergeStrategy, getLockingStrategy, getMaxAliasLength, getNameQualifierSupport, getNativeIdentifierGeneratorClass, getNativeIdentifierGeneratorStrategy, getNoColumnsInsertString, getNotExpression, getQueryHintString, getReadLockString, getResultSet, getResultSet, getResultSet, getSchemaNameResolver, getSelectClauseNullString, getSequenceExporter, getSequenceInformationExtractor, getSqlTypeDescriptorOverride, getTableComment, getTableExporter, getTableTypeString, getTypeName, getTypeName, getUniqueDelegate, getUniqueKeyExporter, getViolatedConstraintNameExtracter, getWriteLockString, hasAlterTable, hasSelfReferentialForeignKeyBug, isCurrentTimestampSelectStringCallable, isJdbcLogWarningsEnabledByDefault, isLockTimeoutParameterized, openQuote, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, registerResultSetOutParameter, remapSqlTypeDescriptor, renderOrderByElement, replaceResultVariableInOrderByClauseWithPosition, requiresCastingOfParametersInSelectClause, requiresParensForTupleDistinctCounts, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsCommentOn, supportsCurrentTimestampSelection, supportsExistsInSelect, supportsIfExistsAfterConstraintName, supportsIfExistsAfterTableName, supportsIfExistsBeforeConstraintName, supportsIfExistsBeforeTableName, supportsLobValueChangePropogation, supportsLockTimeouts, supportsNamedParameters, supportsNationalizedTypes, supportsNotNullUnique, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsTableCheck, supportsTupleCounts, supportsTuplesInSubqueries, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, 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

IngresDialect

public IngresDialect()

Constructs a IngresDialect

Method Detail

getSelectGUIDString

public String getSelectGUIDString()

Description copied from class: Dialect

Get the command used to select a GUID from the underlying database.

Optional operation.

Overrides:

getSelectGUIDString in class Dialect

Returns:

The appropriate command.

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 Dialect

Returns:

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

getAddColumnString

public String getAddColumnString()

Description copied from class: Dialect

The syntax used to add a column to a table (optional).

Overrides:

getAddColumnString in class Dialect

Returns:

The "add column" fragment.

getNullColumnString

public String getNullColumnString()

Description copied from class: Dialect

The keyword used to specify a nullable column.

Overrides:

getNullColumnString in class Dialect

Returns:

String

supportsSequences

public boolean supportsSequences()

Description copied from class: Dialect

Does this dialect support sequences?

Overrides:

supportsSequences in class Dialect

Returns:

True if sequences supported; false otherwise.

getSequenceNextValString

public String getSequenceNextValString(String sequenceName)

Description copied from class: Dialect

Generate the appropriate select statement to to retrieve the next value of a sequence.

This should be a "stand alone" select statement.

Overrides:

getSequenceNextValString in class Dialect

Parameters:

sequenceName - the name of the sequence

Returns:

String The "nextval" select string.

getSelectSequenceNextValString

public String getSelectSequenceNextValString(String sequenceName)

Description copied from class: Dialect

Generate the select expression fragment that will retrieve the next value of a sequence as part of another (typically DML) statement.

This differs from Dialect.getSequenceNextValString(String) in that this should return an expression usable within another statement.

Overrides:

getSelectSequenceNextValString in class Dialect

Parameters:

sequenceName - the name of the sequence

Returns:

The "nextval" fragment.

getCreateSequenceString

public String getCreateSequenceString(String sequenceName)

Description copied from class: Dialect

Typically dialects which support sequences can create a sequence with a single command. This is convenience form of Dialect.getCreateSequenceStrings(java.lang.String) to help facilitate that.

Dialects which support sequences and can create a sequence in a single command need *only* override this method. Dialects which support sequences but require multiple commands to create a sequence should instead override Dialect.getCreateSequenceStrings(java.lang.String).

Overrides:

getCreateSequenceString in class Dialect

Parameters:

sequenceName - The name of the sequence

Returns:

The sequence creation command

getDropSequenceString

public String getDropSequenceString(String sequenceName)

Description copied from class: Dialect

Typically dialects which support sequences can drop a sequence with a single command. This is convenience form of Dialect.getDropSequenceStrings(java.lang.String) to help facilitate that.

Dialects which support sequences and can drop a sequence in a single command need *only* override this method. Dialects which support sequences but require multiple commands to drop a sequence should instead override Dialect.getDropSequenceStrings(java.lang.String).

Overrides:

getDropSequenceString in class Dialect

Parameters:

sequenceName - The name of the sequence

Returns:

The sequence drop commands

getQuerySequencesString

public String getQuerySequencesString()

Description copied from class: Dialect

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

Overrides:

getQuerySequencesString in class Dialect

Returns:

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

See Also:

SchemaUpdate

getLowercaseFunction

public String getLowercaseFunction()

Description copied from class: Dialect

The name of the SQL function that transforms a string to lowercase

Overrides:

getLowercaseFunction in class Dialect

Returns:

The dialect-specific lowercase function.

getLimitHandler

public LimitHandler getLimitHandler()

Description copied from class: Dialect

Returns the delegate managing LIMIT clause.

Overrides:

getLimitHandler in class Dialect

Returns:

LIMIT clause delegate.

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 Dialect

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.

getLimitString

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

Description copied from class: Dialect

Given a limit and an offset, apply the limit clause to the query.

Overrides:

getLimitString in class Dialect

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 query statement with the limit applied.

supportsVariableLimit

public boolean supportsVariableLimit()

Description copied from class: Dialect

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

Overrides:

supportsVariableLimit in class Dialect

Returns:

True if bind variables can be used; false otherwise.

useMaxForLimit

public boolean useMaxForLimit()

Description copied from class: Dialect

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

This is easiest understood via an example. Consider you have a table with 20 rows, but you only want to retrieve rows number 11 through 20. Generally, a limit with offset would say that the offset = 11 and the limit = 10 (we only want 10 rows at a time); this is specifying the total number of returned rows. Some dialects require that we instead specify offset = 11 and limit = 20, where 20 is the "last" row we want relative to offset (i.e. total number of rows = 20 - 11 = 9)

So essentially, is limit relative from offset? Or is limit absolute?

Overrides:

useMaxForLimit in class Dialect

Returns:

True if limit is relative from offset; false otherwise.

getDefaultMultiTableBulkIdStrategy

public MultiTableBulkIdStrategy getDefaultMultiTableBulkIdStrategy()

Overrides:

getDefaultMultiTableBulkIdStrategy in class Dialect

getCurrentTimestampSQLFunctionName

public String getCurrentTimestampSQLFunctionName()

Description copied from class: Dialect

The name of the database-specific SQL function for retrieving the current timestamp.

Overrides:

getCurrentTimestampSQLFunctionName in class Dialect

Returns:

The function name.

supportsSubselectAsInPredicateLHS

public boolean supportsSubselectAsInPredicateLHS()

Description copied from class: Dialect

Are subselects supported as the left-hand-side (LHS) of IN-predicates.

In other words, is syntax like "... IN (1, 2, 3) ..." supported?

Overrides:

supportsSubselectAsInPredicateLHS in class Dialect

Returns:

True if subselects can appear as the LHS of an in-predicate; false otherwise.

supportsEmptyInList

public boolean supportsEmptyInList()

Description copied from class: Dialect

Does this dialect support empty IN lists?

For example, is [where XYZ in ()] a supported construct?

Overrides:

supportsEmptyInList in class Dialect

Returns:

True if empty in lists are supported; false otherwise.

supportsExpectedLobUsagePattern

public boolean supportsExpectedLobUsagePattern()

Description copied from class: Dialect

Expected LOB usage pattern is such that I can perform an insert via prepared statement with a parameter binding for a LOB value without crazy casting to JDBC driver implementation-specific classes...

Part of the trickiness here is the fact that this is largely driver dependent. For example, Oracle (which is notoriously bad with LOB support in their drivers historically) actually does a pretty good job with LOB support as of the 10.2.x versions of their drivers...

Overrides:

supportsExpectedLobUsagePattern in class Dialect

Returns:

True if normal LOB usage patterns can be used with this driver; false if driver-specific hookiness needs to be applied.

supportsTupleDistinctCounts

public boolean supportsTupleDistinctCounts()

Description copied from class: Dialect

Does this dialect support `count(distinct a,b)`?

Overrides:

supportsTupleDistinctCounts in class Dialect

Returns:

True if the database supports counting distinct tuples; false otherwise.