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RDMSOS2200Dialect (Hibernate API Documentation) - Hibernate 3.2.3 正式版 API 英文文档

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org.hibernate.dialect
Class RDMSOS2200Dialect

java.lang.Object
  org.hibernate.dialect.Dialect
      org.hibernate.dialect.RDMSOS2200Dialect

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public class RDMSOS2200Dialect

extends Dialect

Author:

Ploski and Hanson

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Field Summary

 

Fields inherited from class org.hibernate.dialect.Dialect

CLOSED_QUOTE, DEFAULT_BATCH_SIZE, NO_BATCH, QUOTE

 

Constructor Summary

RDMSOS2200Dialect()

 

Method Summary
CaseFragment	createCaseFragment()           Create a CaseFragment strategy responsible for handling this dialect's variations in how CASE statements are handled.
boolean	forUpdateOfColumns()           The RDMS DB supports the 'FOR UPDATE OF' clause.
String	getAddColumnString()           The syntax used to add a column to a table (optional).
String	getCascadeConstraintsString()           Completely optional cascading drop clause
String	getCreateSequenceString(String sequenceName)           Typically dialects which support sequences can create a sequence with a single command.
String	getDropSequenceString(String sequenceName)           Typically dialects which support sequences can drop a sequence with a single command.
String	getForUpdateString()           Since the RDMS-JDBC driver does not support for updates, this string is set to an empty string.
String	getLimitString(String sql, 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	getNullColumnString()           The keyword used to specify a nullable column.
String	getSequenceNextValString(String sequenceName)           Generate the appropriate select statement to to retreive the next value of a sequence.
boolean	qualifyIndexName()           RDMS does not support qualifing index names with the schema name.
boolean	supportsCascadeDelete()           RDMS does not support Cascade Deletes.
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	supportsOuterJoinForUpdate()           Currently, RDMS-JDBC does not support ForUpdate.
boolean	supportsSequences()           Does this dialect support sequences?
boolean	supportsUnionAll()           Does this dialect support UNION ALL, which is generally a faster variant of UNION?
boolean	supportsUniqueConstraintInCreateAlterTable()           RDMS does not 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?

 

Methods inherited from class org.hibernate.dialect.Dialect

appendIdentitySelectToInsert, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildSQLExceptionConverter, closeQuote, createOuterJoinFragment, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, dropConstraints, dropTemporaryTableAfterUse, generateTemporaryTableName, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getCastTypeName, getColumnComment, getCreateMultisetTableString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCreateTemporaryTablePostfix, getCreateTemporaryTableString, getCurrentTimestampSelectString, getCurrentTimestampSQLFunctionName, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceStrings, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentityColumnString, getIdentityInsertString, getIdentitySelectString, getIdentitySelectString, getKeywords, getLimitString, getLowercaseFunction, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getQuerySequencesString, getResultSet, getSelectClauseNullString, getSelectGUIDString, getSelectSequenceNextValString, getTableComment, getTableTypeString, getTypeName, getTypeName, getViolatedConstraintNameExtracter, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, isCurrentTimestampSelectStringCallable, openQuote, performTemporaryTableDDLInIsolation, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, supportsBindAsCallableArgument, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsCommentOn, supportsCurrentTimestampSelection, supportsEmptyInList, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsIdentityColumns, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLobValueChangePropogation, supportsNotNullUnique, supportsParametersInInsertSelect, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTemporaryTables, supportsUnboundedLobLocatorMaterialization, supportsUnique, toBooleanValueString, toString, transformSelectString, useInputStreamToInsertBlob, useMaxForLimit

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

RDMSOS2200Dialect

public RDMSOS2200Dialect()

Method Detail

qualifyIndexName

public boolean qualifyIndexName()

RDMS does not support qualifing index names with the schema name.

Overrides:

qualifyIndexName in class Dialect

Returns:

boolean

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forUpdateOfColumns

public boolean forUpdateOfColumns()

The RDMS DB supports the 'FOR UPDATE OF' clause. However, the RDMS-JDBC driver does not support this feature, so a false is return. The base dialect also returns a false, but we will leave this over-ride in to make sure it stays false.

Overrides:

forUpdateOfColumns in class Dialect

Returns:

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

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getForUpdateString

public String getForUpdateString()

Since the RDMS-JDBC driver does not support for updates, this string is set to an empty string. Whenever, the driver does support this feature, the returned string should be " FOR UPDATE OF". Note that RDMS does not support the string 'FOR UPDATE' string.

Overrides:

getForUpdateString in class Dialect

Returns:

The appropriate FOR UPDATE clause string.

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supportsUniqueConstraintInCreateAlterTable

public boolean supportsUniqueConstraintInCreateAlterTable()

RDMS does not support adding Unique constraints via create and alter table.

Overrides:

supportsUniqueConstraintInCreateAlterTable in class Dialect

Returns:

boolean

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supportsCascadeDelete

public boolean supportsCascadeDelete()

RDMS does not support Cascade Deletes. Need to review this in the future when support is provided.

Overrides:

supportsCascadeDelete in class Dialect

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supportsOuterJoinForUpdate

public boolean supportsOuterJoinForUpdate()

Currently, RDMS-JDBC does not support ForUpdate. Need to review this in the future when support is provided.

Overrides:

supportsOuterJoinForUpdate in class Dialect

Returns:

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

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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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getNullColumnString

public String getNullColumnString()

Description copied from class: Dialect

The keyword used to specify a nullable column.

Overrides:

getNullColumnString in class Dialect

Returns:

String

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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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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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getCascadeConstraintsString

public String getCascadeConstraintsString()

Description copied from class: Dialect

Completely optional cascading drop clause

Overrides:

getCascadeConstraintsString in class Dialect

Returns:

String

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createCaseFragment

public CaseFragment createCaseFragment()

Description copied from class: Dialect

Create a CaseFragment strategy responsible for handling this dialect's variations in how CASE statements are handled.

Overrides:

createCaseFragment in class Dialect

Returns:

This dialect's CaseFragment strategy.

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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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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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getLimitString

public String getLimitString(String sql,
                             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:

sql - 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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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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supportsUnionAll

public boolean supportsUnionAll()

Description copied from class: Dialect

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.

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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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