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

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org.hibernate.dialect
Class TeradataDialect

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

public class TeradataDialect
extends Dialect

A dialect for the Teradata database created by MCR as part of the dialect certification process.

Author:: Jay Nance

Field Summary

Fields inherited from class org.hibernate.dialect.Dialect

CLOSED_QUOTE, DEFAULT_BATCH_SIZE, NO_BATCH, QUOTE

Constructor Summary

TeradataDialect()
          Constructor

Method Summary

boolean areStringComparisonsCaseInsensitive()
          Are string comparisons implicitly case insensitive.

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 dropTemporaryTableAfterUse()
          Do we need to drop the temporary table after use?

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

String getCreateMultisetTableString()
          Slight variation on Dialect.getCreateTableString().

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 getForUpdateString()
          Does this dialect support the FOR UPDATE syntax?

String getSelectClauseNullString(int sqlType)
          Given a Types type code, determine an appropriate null value to use in a select clause.

String getTypeName(int code, int length, int precision, int scale)
          Get the name of the database type associated with the given java.sql.Types typecode.

Boolean performTemporaryTableDDLInIsolation()
          Does the dialect require that temporary table DDL statements occur in isolation from other statements? This would be the case if the creation would cause any current transaction to get committed implicitly.

boolean supportsBindAsCallableArgument()
          Does this dialect support using a JDBC bind parameter as an argument to a function or procedure call?

boolean supportsCascadeDelete()


boolean supportsCircularCascadeDeleteConstraints()
          Does this dialect support definition of cascade delete constraints which can cause circular chains?

boolean supportsEmptyInList()
          Does this dialect support empty IN lists?
For example, is [where XYZ in ()] a supported construct?

boolean supportsIdentityColumns()
          Does this dialect support identity column key generation?

boolean supportsLobValueChangePropogation()
          Does the dialect support propogating changes to LOB values back to the database? Talking about mutating the internal value of the locator as opposed to supplying a new locator instance...

boolean supportsSequences()
          Does this dialect support sequences?

boolean supportsTemporaryTables()
          Does this dialect support temporary tables?

Methods inherited from class org.hibernate.dialect.Dialect

appendIdentitySelectToInsert, appendLockHint, applyLocksToSql, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildSQLExceptionConverter, closeQuote, createCaseFragment, createOuterJoinFragment, dropConstraints, forUpdateOfColumns, generateTemporaryTableName, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getCascadeConstraintsString, getCastTypeName, getColumnComment, getCreateSequenceString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCurrentTimestampSelectString, getCurrentTimestampSQLFunctionName, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceString, getDropSequenceStrings, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentityColumnString, getIdentityInsertString, getIdentitySelectString, getIdentitySelectString, getKeywords, getLimitString, getLimitString, getLockingStrategy, getLowercaseFunction, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getNullColumnString, getQuerySequencesString, getResultSet, getSelectGUIDString, getSelectSequenceNextValString, getSequenceNextValString, getTableComment, getTableTypeString, getTypeName, getViolatedConstraintNameExtracter, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, isCurrentTimestampSelectStringCallable, openQuote, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, supportsColumnCheck, supportsCommentOn, supportsCurrentTimestampSelection, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLimit, supportsLimitOffset, supportsNotNullUnique, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, supportsUnique, supportsUniqueConstraintInCreateAlterTable, supportsVariableLimit, toBooleanValueString, toString, transformSelectString, useInputStreamToInsertBlob, useMaxForLimit

Methods inherited from class java.lang.Object

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

Constructor Detail

TeradataDialect

public TeradataDialect()

Constructor

Method Detail

getForUpdateString

public String getForUpdateString()

Does this dialect support the FOR UPDATE syntax?

Overrides:: getForUpdateString in class Dialect

Returns:: empty string ... Teradata does not support FOR UPDATE syntax

supportsIdentityColumns public boolean supportsIdentityColumns() Description copied from class: Dialect Does this dialect support identity column key generation? Overrides: supportsIdentityColumns in class Dialect Returns: True if IDENTITY columns are supported; false otherwise. 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. 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. 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. 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. performTemporaryTableDDLInIsolation public Boolean performTemporaryTableDDLInIsolation() Description copied from class: Dialect Does the dialect require that temporary table DDL statements occur in isolation from other statements? This would be the case if the creation would cause any current transaction to get committed implicitly. JDBC defines a standard way to query for this information via the DatabaseMetaData.dataDefinitionCausesTransactionCommit() method. However, that does not distinguish between temporary table DDL and other forms of DDL; MySQL, for example, reports DDL causing a transaction commit via its driver, even though that is not the case for temporary table DDL. Possible return values and their meanings: Boolean.TRUE - Unequivocally, perform the temporary table DDL in isolation. Boolean.FALSE - Unequivocally, do not perform the temporary table DDL in isolation. null - defer to the JDBC driver response in regards to DatabaseMetaData.dataDefinitionCausesTransactionCommit() Overrides: performTemporaryTableDDLInIsolation in class Dialect Returns: see the result matrix above. dropTemporaryTableAfterUse public boolean dropTemporaryTableAfterUse() Description copied from class: Dialect Do we need to drop the temporary table after use? Overrides: dropTemporaryTableAfterUse in class Dialect Returns: True if the table should be dropped. getTypeName public String getTypeName(int code, int length, int precision, int scale) throws HibernateException Get the name of the database type associated with the given java.sql.Types typecode. Overrides: getTypeName in class Dialect Parameters: code - java.sql.Types typecode length - the length or precision of the column precision - the precision of the column scale - the scale of the column Returns: the database type name Throws: HibernateException supportsCascadeDelete public boolean supportsCascadeDelete() Overrides: supportsCascadeDelete in class Dialect supportsCircularCascadeDeleteConstraints public boolean supportsCircularCascadeDeleteConstraints() Description copied from class: Dialect Does this dialect support definition of cascade delete constraints which can cause circular chains? Overrides: supportsCircularCascadeDeleteConstraints in class Dialect Returns: True if circular cascade delete constraints are supported; false otherwise. areStringComparisonsCaseInsensitive public boolean areStringComparisonsCaseInsensitive() Description copied from class: Dialect Are string comparisons implicitly case insensitive. In other words, does [where 'XYZ' = 'xyz'] resolve to true? Overrides: areStringComparisonsCaseInsensitive in class Dialect Returns: True if comparisons are case insensitive. 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. getSelectClauseNullString public String getSelectClauseNullString(int sqlType) Description copied from class: Dialect Given a Types type code, determine an appropriate null value to use in a select clause. One thing to consider here is that certain databases might require proper casting for the nulls here since the select here will be part of a UNION/UNION ALL. Overrides: getSelectClauseNullString in class Dialect Parameters: sqlType - The Types type code. Returns: The appropriate select clause value fragment. getCreateMultisetTableString public String getCreateMultisetTableString() Description copied from class: Dialect Slight variation on Dialect.getCreateTableString(). Here, we have the command used to create a table when there is no primary key and duplicate rows are expected. Most databases do not care about the distinction; originally added for Teradata support which does care. Overrides: getCreateMultisetTableString in class Dialect Returns: The command used to create a multiset table. supportsLobValueChangePropogation public boolean supportsLobValueChangePropogation() Description copied from class: Dialect Does the dialect support propogating changes to LOB values back to the database? Talking about mutating the internal value of the locator as opposed to supplying a new locator instance... For BLOBs, the internal value might be changed by: Blob.setBinaryStream(long), Blob.setBytes(long, byte[]), Blob.setBytes(long, byte[], int, int), or Blob.truncate(long). For CLOBs, the internal value might be changed by: Clob.setAsciiStream(long), Clob.setCharacterStream(long), Clob.setString(long, String), Clob.setString(long, String, int, int), or Clob.truncate(long). NOTE : I do not know the correct answer currently for databases which (1) are not part of the cruise control process or (2) do not Dialect.supportsExpectedLobUsagePattern(). Overrides: supportsLobValueChangePropogation in class Dialect Returns: True if the changes are propogated back to the database; false otherwise. doesReadCommittedCauseWritersToBlockReaders public boolean doesReadCommittedCauseWritersToBlockReaders() Description copied from class: Dialect 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 if writers block readers to achieve READ_COMMITTED; false otherwise. doesRepeatableReadCauseReadersToBlockWriters public boolean doesRepeatableReadCauseReadersToBlockWriters() Description copied from class: Dialect 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 if readers block writers to achieve REPEATABLE_READ; false otherwise. supportsBindAsCallableArgument public boolean supportsBindAsCallableArgument() Description copied from class: Dialect Does this dialect support using a JDBC bind parameter as an argument to a function or procedure call? Overrides: supportsBindAsCallableArgument in class Dialect Returns: True if the database supports accepting bind params as args; false otherwise. 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Method Summary
`boolean`	`areStringComparisonsCaseInsensitive()` Are string comparisons implicitly case insensitive.
`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`	`dropTemporaryTableAfterUse()` Do we need to drop the temporary table after use?
`String`	`getAddColumnString()` The syntax used to add a column to a table (optional).
`String`	`getCreateMultisetTableString()` Slight variation on `Dialect.getCreateTableString()`.
`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`	`getForUpdateString()` Does this dialect support the `FOR UPDATE` syntax?
`String`	`getSelectClauseNullString(int sqlType)` Given a `Types` type code, determine an appropriate null value to use in a select clause.
`String`	`getTypeName(int code, int length, int precision, int scale)` Get the name of the database type associated with the given `java.sql.Types` typecode.
`Boolean`	`performTemporaryTableDDLInIsolation()` Does the dialect require that temporary table DDL statements occur in isolation from other statements? This would be the case if the creation would cause any current transaction to get committed implicitly.
`boolean`	`supportsBindAsCallableArgument()` Does this dialect support using a JDBC bind parameter as an argument to a function or procedure call?
`boolean`	`supportsCascadeDelete()`
`boolean`	`supportsCircularCascadeDeleteConstraints()` Does this dialect support definition of cascade delete constraints which can cause circular chains?
`boolean`	`supportsEmptyInList()` Does this dialect support empty IN lists? For example, is [where XYZ in ()] a supported construct?
`boolean`	`supportsIdentityColumns()` Does this dialect support identity column key generation?
`boolean`	`supportsLobValueChangePropogation()` Does the dialect support propogating changes to LOB values back to the database? Talking about mutating the internal value of the locator as opposed to supplying a new locator instance...
`boolean`	`supportsSequences()` Does this dialect support sequences?
`boolean`	`supportsTemporaryTables()` Does this dialect support temporary tables?

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

org.hibernate.dialect Class TeradataDialect

TeradataDialect

getForUpdateString

supportsIdentityColumns

supportsSequences

getAddColumnString

supportsTemporaryTables

getCreateTemporaryTableString

getCreateTemporaryTablePostfix

performTemporaryTableDDLInIsolation

dropTemporaryTableAfterUse

getTypeName

supportsCascadeDelete

supportsCircularCascadeDeleteConstraints

areStringComparisonsCaseInsensitive

supportsEmptyInList

getSelectClauseNullString

getCreateMultisetTableString

supportsLobValueChangePropogation

doesReadCommittedCauseWritersToBlockReaders

doesRepeatableReadCauseReadersToBlockWriters

supportsBindAsCallableArgument

org.hibernate.dialect
Class TeradataDialect