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TimesTenDialect (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.dialect
Class TimesTenDialect

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

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public class TimesTenDialect

extends Dialect

A SQL dialect for TimesTen 5.1. Known limitations: joined-subclass support because of no CASE support in TimesTen No support for subqueries that includes aggregation - size() in HQL not supported - user queries that does subqueries with aggregation No CLOB/BLOB support No cascade delete support. No Calendar support No support for updating primary keys.

Author:

Sherry Listgarten and Max Andersen

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Field Summary

 

Fields inherited from class org.hibernate.dialect.Dialect

CLOSED_QUOTE, DEFAULT_BATCH_SIZE, NO_BATCH, QUOTE

 

Constructor Summary

TimesTenDialect()

 

Method Summary
JoinFragment	createOuterJoinFragment()           Create a JoinFragment strategy responsible for handling this dialect's variations in how joins are handled.
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 bas table.
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	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	getCurrentTimestampSelectString()           Retrieve the command used to retrieve the current timestammp from the database.
String	getDropSequenceString(String sequenceName)           Typically dialects which support sequences can drop a sequence with a single command.
String	getForUpdateString()           Get the string to append to SELECT statements to acquire locks for this dialect.
String	getLimitString(String querySelect, int offset, int limit)           Given a limit and an offset, apply the limit clause to the query.
LockingStrategy	getLockingStrategy(Lockable lockable, LockMode lockMode)           Get a strategy instance which knows how to acquire a database-level lock of the specified mode for this dialect.
String	getQuerySequencesString()           Get the select command used retrieve the names of all sequences.
String	getSelectSequenceNextValString(String sequenceName)           Generate the select expression fragment that will retreive the next value of a sequence as part of another (typically DML) statement.
String	getSequenceNextValString(String sequenceName)           Generate the appropriate select statement to to retreive the next value of a sequence.
boolean	isCurrentTimestampSelectStringCallable()           Should the value returned by getCurrentTimestampSelectString() be treated as callable.
boolean	qualifyIndexName()           Do we need to qualify index names with the schema name?
boolean	supportsColumnCheck()           Does this dialect support column-level check constraints?
boolean	supportsCurrentTimestampSelection()           Does this dialect support a way to retrieve the database's current timestamp value?
boolean	supportsEmptyInList()           Does this dialect support empty IN lists? For example, is [where XYZ in ()] a supported construct?
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	supportsTableCheck()           Does this dialect support table-level check constraints?
boolean	supportsTemporaryTables()           Does this dialect support temporary tables?
boolean	supportsUnique()           Does this dialect support the UNIQUE column syntax?
boolean	supportsUniqueConstraintInCreateAlterTable()           Does this dialect support adding Unique constraints via create and alter table ?
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? This is easiest understood via an example.

 

Methods inherited from class org.hibernate.dialect.Dialect

appendIdentitySelectToInsert, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildSQLExceptionConverter, closeQuote, createCaseFragment, 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, getIdentityColumnString, getIdentityInsertString, getIdentitySelectString, getIdentitySelectString, getKeywords, getLimitString, getLowercaseFunction, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getNullColumnString, getResultSet, getSelectClauseNullString, getSelectGUIDString, getTableComment, getTableTypeString, getTypeName, getTypeName, getViolatedConstraintNameExtracter, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, openQuote, performTemporaryTableDDLInIsolation, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCircularCascadeDeleteConstraints, supportsCommentOn, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsIdentityColumns, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLobValueChangePropogation, supportsNotNullUnique, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, toBooleanValueString, toString, transformSelectString, useInputStreamToInsertBlob

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

TimesTenDialect

public TimesTenDialect()

Method Detail

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.

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qualifyIndexName

public boolean qualifyIndexName()

Description copied from class: Dialect

Do we need to qualify index names with the schema name?

Overrides:

qualifyIndexName in class Dialect

Returns:

boolean

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supportsUnique

public boolean supportsUnique()

Description copied from class: Dialect

Does this dialect support the UNIQUE column syntax?

Overrides:

supportsUnique in class Dialect

Returns:

boolean

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supportsUniqueConstraintInCreateAlterTable

public boolean supportsUniqueConstraintInCreateAlterTable()

Description copied from class: Dialect

Does this dialect support adding Unique constraints via create and alter table ?

Overrides:

supportsUniqueConstraintInCreateAlterTable in class Dialect

Returns:

boolean

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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.

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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.

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getSelectSequenceNextValString

public String getSelectSequenceNextValString(String sequenceName)

Description copied from class: Dialect

Generate the select expression fragment that will retreive 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.

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getSequenceNextValString

public String getSequenceNextValString(String sequenceName)

Description copied from class: Dialect

Generate the appropriate select statement to to retreive 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.

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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

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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

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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

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createOuterJoinFragment

public JoinFragment createOuterJoinFragment()

Description copied from class: Dialect

Create a JoinFragment strategy responsible for handling this dialect's variations in how joins are handled.

Overrides:

createOuterJoinFragment in class Dialect

Returns:

This dialect's JoinFragment strategy.

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getForUpdateString

public String getForUpdateString()

Description copied from class: Dialect

Get the string to append to SELECT statements to acquire locks for this dialect.

Overrides:

getForUpdateString in class Dialect

Returns:

The appropriate FOR UPDATE clause string.

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supportsColumnCheck

public boolean supportsColumnCheck()

Description copied from class: Dialect

Does this dialect support column-level check constraints?

Overrides:

supportsColumnCheck in class Dialect

Returns:

True if column-level CHECK constraints are supported; false otherwise.

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supportsTableCheck

public boolean supportsTableCheck()

Description copied from class: Dialect

Does this dialect support table-level check constraints?

Overrides:

supportsTableCheck in class Dialect

Returns:

True if table-level CHECK constraints are supported; false otherwise.

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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.

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supportsVariableLimit

public boolean supportsVariableLimit()

Description copied from class: Dialect

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

Overrides:

supportsVariableLimit in class Dialect

Returns:

True if bind variables can be used; false otherwise.

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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.

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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.

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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.

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supportsCurrentTimestampSelection

public boolean supportsCurrentTimestampSelection()

Description copied from class: Dialect

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.

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getCurrentTimestampSelectString

public String getCurrentTimestampSelectString()

Description copied from class: Dialect

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

Overrides:

getCurrentTimestampSelectString in class Dialect

Returns:

The command.

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isCurrentTimestampSelectStringCallable

public boolean isCurrentTimestampSelectStringCallable()

Description copied from class: Dialect

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

Overrides:

isCurrentTimestampSelectStringCallable in class Dialect

Returns:

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

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supportsTemporaryTables

public boolean supportsTemporaryTables()

Description copied from class: Dialect

Does this dialect support temporary tables?

Overrides:

supportsTemporaryTables in class Dialect

Returns:

True if temp tables are supported; false otherwise.

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generateTemporaryTableName

public String generateTemporaryTableName(String baseTableName)

Description copied from class: Dialect

Generate a temporary table name given the bas 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.

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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.

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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.

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getLockingStrategy

public LockingStrategy getLockingStrategy(Lockable lockable,
                                          LockMode lockMode)

Description copied from class: Dialect

Get a strategy instance which knows how to acquire a database-level lock of the specified mode for this dialect.

Overrides:

getLockingStrategy in class Dialect

Parameters:

lockable - The persister for the entity to be locked.

lockMode - The type of lock to be acquired.

Returns:

The appropriate locking strategy.

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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.

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