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DB2Dialect (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.dialect
Class DB2Dialect

java.lang.Object
  org.hibernate.dialect.Dialect
      org.hibernate.dialect.DB2Dialect

Direct Known Subclasses:

DB2390Dialect, DB2400Dialect, DerbyDialect

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public class DB2Dialect

extends Dialect

An SQL dialect for DB2.

Author:

Gavin King

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Field Summary

 

Fields inherited from class org.hibernate.dialect.Dialect

CLOSED_QUOTE, DEFAULT_BATCH_SIZE, NO_BATCH, QUOTE

 

Constructor Summary

DB2Dialect()

 

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 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	getCurrentTimestampSQLFunctionName()           The name of the database-specific SQL function for retrieving the current timestamp.
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	getIdentityColumnString()           The syntax used during DDL to define a column as being an IDENTITY.
String	getIdentityInsertString()           The keyword used to insert a generated value into an identity column (or null).
String	getIdentitySelectString()           Get the select command to use to retrieve the last generated IDENTITY value.
String	getLimitString(String sql, boolean hasOffset)           Apply s limit clause to the query.
String	getLowercaseFunction()           The name of the SQL function that transforms a string to lowercase
String	getQuerySequencesString()           Get the select command used retrieve the names of all sequences.
ResultSet	getResultSet(CallableStatement ps)           Given a callable statement previously processed by registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the OUT parameter.
String	getSelectClauseNullString(int sqlType)           Given a Types type code, determine an appropriate null value to use in a select clause.
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.
static void	main(String[] args)
int	registerResultSetOutParameter(CallableStatement statement, int col)           Registers an OUT parameter which will be returing a ResultSet.
boolean	supportsCommentOn()
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	supportsIdentityColumns()           Does this dialect support identity column key generation?
boolean	supportsLimit()           Does this dialect support some form of limiting query results via a SQL clause?
boolean	supportsNotNullUnique()
boolean	supportsOuterJoinForUpdate()           Does this dialect support FOR UPDATE in conjunction with outer joined rows?
boolean	supportsParametersInInsertSelect()           Does this dialect support parameters within the select clause of INSERT ...
boolean	supportsSequences()           Does this dialect support sequences?
boolean	supportsTemporaryTables()           Does this dialect support temporary tables?
boolean	supportsUnionAll()           Does this dialect support UNION ALL, which is generally a faster variant of UNION?
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, createOuterJoinFragment, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, dropTemporaryTableAfterUse, forUpdateOfColumns, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getCascadeConstraintsString, getCastTypeName, getColumnComment, getCreateMultisetTableString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceStrings, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentitySelectString, getKeywords, getLimitString, getLockingStrategy, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getNullColumnString, getSelectGUIDString, getSelectSequenceNextValString, getTableComment, getTableTypeString, getTypeName, getTypeName, getViolatedConstraintNameExtracter, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, openQuote, performTemporaryTableDDLInIsolation, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLimitOffset, supportsLobValueChangePropogation, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsUnboundedLobLocatorMaterialization, supportsUnique, supportsUniqueConstraintInCreateAlterTable, supportsVariableLimit, toBooleanValueString, toString, transformSelectString, useInputStreamToInsertBlob

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

DB2Dialect

public DB2Dialect()

Method Detail

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.

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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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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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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.

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getIdentitySelectString

public String getIdentitySelectString()

Description copied from class: Dialect

Get the select command to use to retrieve the last generated IDENTITY value.

Overrides:

getIdentitySelectString in class Dialect

Returns:

The appropriate select command

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getIdentityColumnString

public String getIdentityColumnString()

Description copied from class: Dialect

The syntax used during DDL to define a column as being an IDENTITY.

Overrides:

getIdentityColumnString in class Dialect

Returns:

The appropriate DDL fragment.

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getIdentityInsertString

public String getIdentityInsertString()

Description copied from class: Dialect

The keyword used to insert a generated value into an identity column (or null). Need if the dialect does not support inserts that specify no column values.

Overrides:

getIdentityInsertString in class Dialect

Returns:

The appropriate keyword.

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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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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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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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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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getLimitString

public String getLimitString(String sql,
                             boolean hasOffset)

Description copied from class: Dialect

Apply s limit clause to the query.

Typically dialects utilize variable limit caluses when they support limits. Thus, when building the select command we do not actually need to know the limit or the offest since we will just be using placeholders.

Here we do still pass along whether or not an offset was specified so that dialects not supporting offsets can generate proper exceptions. In general, dialects will override one or the other of this method and Dialect.getLimitString(String, int, int).

Overrides:

getLimitString in class Dialect

Parameters:

sql - The query to which to apply the limit.

hasOffset - Is the query requesting an offset?

Returns:

the modified SQL

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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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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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supportsOuterJoinForUpdate

public boolean supportsOuterJoinForUpdate()

Description copied from class: Dialect

Does this dialect support FOR UPDATE in conjunction with outer joined rows?

Overrides:

supportsOuterJoinForUpdate in class Dialect

Returns:

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

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supportsNotNullUnique

public boolean supportsNotNullUnique()

Overrides:

supportsNotNullUnique in class Dialect

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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.

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main

public static void main(String[] args)

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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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registerResultSetOutParameter

public int registerResultSetOutParameter(CallableStatement statement,
                                         int col)
                                  throws SQLException

Description copied from class: Dialect

Registers an OUT parameter which will be returing a ResultSet. How this is accomplished varies greatly from DB to DB, hence its inclusion (along with Dialect.getResultSet(java.sql.CallableStatement)) here.

Overrides:

registerResultSetOutParameter in class Dialect

Parameters:

statement - The callable statement.

col - The bind position at which to register the OUT param.

Returns:

The number of (contiguous) bind positions used.

Throws:

SQLException - Indicates problems registering the OUT param.

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getResultSet

public ResultSet getResultSet(CallableStatement ps)
                       throws SQLException

Description copied from class: Dialect

Given a callable statement previously processed by Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the OUT parameter.

Overrides:

getResultSet in class Dialect

Parameters:

ps - The callable statement.

Returns:

The extracted result set.

Throws:

SQLException - Indicates problems extracting the result set.

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supportsCommentOn

public boolean supportsCommentOn()

Overrides:

supportsCommentOn in class Dialect

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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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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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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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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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supportsParametersInInsertSelect

public boolean supportsParametersInInsertSelect()

Description copied from class: Dialect

Does this dialect support parameters within the select clause of INSERT ... SELECT ... statements?

Overrides:

supportsParametersInInsertSelect in class Dialect

Returns:

True if this is supported; false otherwise.

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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.

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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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