org.hibernate.dialect
Class IngresDialect

java.lang.Object
  org.hibernate.dialect.Dialect
      org.hibernate.dialect.IngresDialect

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, NO_BATCH, QUOTE

Constructor Summary

IngresDialect()

Method Summary

boolean	dropConstraints() Do we need to drop constraints before dropping tables in this dialect?
String	generateTemporaryTableName(String baseTableName) Generate a temporary table name given the base table.
String	getAddColumnString() The syntax used to add a column to a table (optional).
String	getCreateSequenceString(String sequenceName) The syntax used to create a sequence, if sequences are supported.
String	getCreateTemporaryTablePostfix() Get any fragments needing to be postfixed to the command for temporary table creation.
String	getCreateTemporaryTableString() Command used to create a temporary table.
String	getCurrentTimestampSQLFunctionName() Expression for current_timestamp
String	getDropSequenceString(String sequenceName) The syntax used to drop a sequence, if sequences are supported.
String	getLimitString(String querySelect, int offset, int limit) Add a LIMIT clause to the given SQL SELECT
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() A query used to find all sequences
String	getSelectGUIDString() Expression for created UUID string
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) The syntax that fetches the next value of a sequence, if sequences are supported.
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	supportsForUpdateOf() Does this dialect support FOR UPDATE OF, allowing particular rows to be locked?
boolean	supportsLimit() Does this Dialect have some kind of LIMIT syntax?
boolean	supportsLimitOffset() Does this dialect support an offset?
boolean	supportsNotNullUnique() Ingres explicitly needs "unique not null", because "with null" is default
boolean	supportsSequences() Does this dialect support sequences?
boolean	supportsSubselectAsInPredicateLHS() Are subselects supported as the left-hand-side (LHS) of IN-predicates.
boolean	supportsTemporaryTables() Does this dialect support temporary tables?
boolean	supportsTupleDistinctCounts() Ingres does not support the syntax `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?

Methods inherited from class org.hibernate.dialect.Dialect

addTypeOverride, appendIdentitySelectToInsert, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildSQLExceptionConverter, closeQuote, convertToFirstRowValue, createCaseFragment, createOuterJoinFragment, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, dropTemporaryTableAfterUse, forceLimitUsage, forUpdateOfColumns, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getCascadeConstraintsString, getCastTypeName, getColumnAliasExtractor, getColumnComment, getCreateMultisetTableString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCrossJoinSeparator, getCurrentTimestampSelectString, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceStrings, getDropTemporaryTableString, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentityColumnString, getIdentityInsertString, getIdentitySelectString, getIdentitySelectString, getKeywords, getLimitString, getLockingStrategy, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getReadLockString, getResultSet, getSelectClauseNullString, getTableComment, getTableTypeString, getTypeName, getTypeName, getTypeOverrides, getViolatedConstraintNameExtracter, getWriteLockString, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, isCurrentTimestampSelectStringCallable, isLockTimeoutParameterized, openQuote, performTemporaryTableDDLInIsolation, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, replaceResultVariableInOrderByClauseWithPosition, requiresCastingOfParametersInSelectClause, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsCommentOn, supportsCurrentTimestampSelection, supportsExistsInSelect, supportsIdentityColumns, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLobValueChangePropogation, supportsLockTimeouts, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsTableCheck, supportsTupleCounts, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, supportsUnique, supportsUniqueConstraintInCreateAlterTable, toBooleanValueString, toString, transformSelectString, useInputStreamToInsertBlob

Methods inherited from class java.lang.Object

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

Constructor Detail

IngresDialect

public IngresDialect()

Method Detail

getSelectGUIDString

public String getSelectGUIDString()

Expression for created UUID string

Overrides:

getSelectGUIDString in class Dialect

Returns:

The appropriate command.

dropConstraints

public boolean dropConstraints()

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

Overrides:

dropConstraints in class Dialect

Returns:

boolean

supportsForUpdateOf

public boolean supportsForUpdateOf()

Does this dialect support FOR UPDATE OF, allowing particular rows to be locked?

Returns:

True (Ingres does support "for update of" syntax...)

getAddColumnString

public String getAddColumnString()

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()

The keyword used to specify a nullable column.

Overrides:

getNullColumnString in class Dialect

Returns:

String

supportsSequences

public boolean supportsSequences()

Does this dialect support sequences?

Overrides:

supportsSequences in class Dialect

Returns:

boolean

getSequenceNextValString

public String getSequenceNextValString(String sequenceName)

The syntax that fetches the next value of a sequence, if sequences are supported.

Overrides:

getSequenceNextValString in class Dialect

Parameters:

sequenceName - the name of the sequence

Returns:

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)

The syntax used to create a sequence, if sequences are supported.

Overrides:

getCreateSequenceString in class Dialect

Parameters:

sequenceName - the name of the sequence

Returns:

String

getDropSequenceString

public String getDropSequenceString(String sequenceName)

The syntax used to drop a sequence, if sequences are supported.

Overrides:

getDropSequenceString in class Dialect

Parameters:

sequenceName - the name of the sequence

Returns:

String

getQuerySequencesString

public String getQuerySequencesString()

A query used to find 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()

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

Overrides:

getLowercaseFunction in class Dialect

Returns:

String

supportsLimit

public boolean supportsLimit()

Does this Dialect have some kind of LIMIT syntax?

Overrides:

supportsLimit in class Dialect

Returns:

True if this dialect supports some form of LIMIT.

supportsLimitOffset

public boolean supportsLimitOffset()

Does this dialect support 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)

Add a LIMIT clause to the given SQL SELECT

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 SQL

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()

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

Overrides:

useMaxForLimit in class Dialect

Returns:

True if limit is relative from offset; false otherwise.

supportsNotNullUnique

public boolean supportsNotNullUnique()

Ingres explicitly needs "unique not null", because "with null" is default

Overrides:

supportsNotNullUnique in class Dialect

supportsTemporaryTables

public boolean supportsTemporaryTables()

Does this dialect support temporary tables?

Overrides:

supportsTemporaryTables in class Dialect

Returns:

True if temp tables are supported; false otherwise.

getCreateTemporaryTableString

public String getCreateTemporaryTableString()

Description copied from class: Dialect

Command used to create a temporary table.

Overrides:

getCreateTemporaryTableString in class Dialect

Returns:

The command used to create a temporary table.

getCreateTemporaryTablePostfix

public String getCreateTemporaryTablePostfix()

Description copied from class: Dialect

Get any fragments needing to be postfixed to the command for temporary table creation.

Overrides:

getCreateTemporaryTablePostfix in class Dialect

Returns:

Any required postfix.

generateTemporaryTableName

public String generateTemporaryTableName(String baseTableName)

Description copied from class: Dialect

Generate a temporary table name given the base table.

Overrides:

generateTemporaryTableName in class Dialect

Parameters:

baseTableName - The table name from which to base the temp table name.

Returns:

The generated temp table name.

getCurrentTimestampSQLFunctionName

public String getCurrentTimestampSQLFunctionName()

Expression for 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()

Ingres does not support the syntax `count(distinct a,b)`?

Overrides:

supportsTupleDistinctCounts in class Dialect

Returns:

False, not supported.