java.lang.Object
- org.hibernate.dialect.Dialect
- - org.hibernate.dialect.DerbyDialect

All Implemented Interfaces:

FunctionContributor, TypeContributor, ConversionContext
```
public class DerbyDialect
extends Dialect
```
A SQL dialect for Apache Derby 10.14.2 and above.

Nested Class Summary
- Nested classes/interfaces inherited from class org.hibernate.dialect.Dialect
  Dialect.SizeStrategy, Dialect.SizeStrategyImpl

Field Summary
- Fields inherited from class org.hibernate.dialect.Dialect
  CLOSED_QUOTE, LEGACY_LOB_MERGE_STRATEGY, LOG_BASE2OF10, NEW_LOCATOR_LOB_MERGE_STRATEGY, QUOTE, STANDARD_MULTI_KEY_LOAD_SIZING_STRATEGY, STREAM_XFER_LOB_MERGE_STRATEGY

Constructor Summary

Constructors
Constructor Description

DerbyDialect()

DerbyDialect(DatabaseVersion version)

DerbyDialect(DialectResolutionInfo info)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`appendBooleanValueString(SqlAppender appender, boolean bool)`	Append the SQL literal expression representing the given boolean value to the given `SqlAppender`.
`void`	`appendDatetimeFormat(SqlAppender appender, String format)`	Translate the given datetime format string from the pattern language defined by Java's `DateTimeFormatter` to whatever pattern language is understood by the native datetime formatting function for this database (often the `to_char()` function).
`IdentifierHelper`	`buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)`	The `IdentifierHelper` indicated by this dialect for handling identifier conversions.
`SQLExceptionConversionDelegate`	`buildSQLExceptionConversionDelegate()`	An instance of `SQLExceptionConversionDelegate` for interpreting dialect-specific error or SQLState codes.
`String`	`castPattern(CastType from, CastType to)`	Derby does have a real `Types.BOOLEAN` type, but it doesn't know how to cast to it.
`protected String`	`columnType(int sqlTypeCode)`	The database column type name for a given JDBC type code defined in `Types` or `SqlTypes`.
`void`	`contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)`	A callback which allows the `Dialect` to contribute types.
`boolean`	`doesReadCommittedCauseWritersToBlockReaders()`	For the underlying database, is `READ_COMMITTED` isolation implemented by forcing readers to wait for write locks to be released?
`String`	`extractPattern(TemporalUnit unit)`	Derby doesn't have an extract() function, and has no functions at all for calendaring, but we can emulate the most basic functionality of extract() using the functions it does have.
`String`	`getCurrentTimestampSelectString()`	The command used to retrieve the current timestamp from the database.
`int`	`getDefaultDecimalPrecision()`	This is the default precision for a generated column mapped to a `BigInteger` or `BigDecimal`.
`int`	`getDefaultStatementBatchSize()`	The default value to use for the configuration property "hibernate.jdbc.batch_size".
`int`	`getDoublePrecision()`	This is the default precision for a generated column mapped to a Java `Double` or `double`.
`String[]`	`getDropSchemaCommand(String schemaName)`	Get the SQL command used to drop the named schema.
`SqmMultiTableInsertStrategy`	`getFallbackSqmInsertStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`	The `SqmMultiTableInsertStrategy` to use when not specified by `QueryEngineOptions.getCustomSqmMultiTableInsertStrategy()`.
`SqmMultiTableMutationStrategy`	`getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`	The `SqmMultiTableMutationStrategy` to use when not specified by `QueryEngineOptions.getCustomSqmMultiTableMutationStrategy()`.
`int`	`getFloatPrecision()`	This is the default precision for a generated column mapped to a Java `Float` or `float`.
`String`	`getForUpdateString()`	Get the string to append to `SELECT` statements to acquire pessimistic UPGRADE locks for this dialect.
`IdentityColumnSupport`	`getIdentityColumnSupport()`	Get the appropriate `IdentityColumnSupport` for this dialect.
`int`	`getInExpressionCountLimit()`	Return the limit that the underlying database places on the number of elements in an `IN` predicate.
`LimitHandler`	`getLimitHandler()`	Obtain a `LimitHandler` that implements pagination support for `Query.setMaxResults(int)` and `Query.setFirstResult(int)`.
`int`	`getMaxVarcharCapacity()`	The longest possible length of a `Types.VARCHAR`-like column.
`int`	`getMaxVarcharLength()`	The biggest size value that can be supplied as argument to a `Types.VARCHAR`-like type.
`protected DatabaseVersion`	`getMinimumSupportedVersion()`	Get the version of the SQL dialect that is the minimum supported by this implementation.
`NationalizationSupport`	`getNationalizationSupport()`	Determines whether this database requires the use of explicitly nationalized character (Unicode) data types.
`String`	`getQuerySequencesString()`	Get the `select` command used retrieve the names of all sequences.
`String`	`getReadLockString(int timeout)`	Get the string to append to `SELECT` statements to acquire READ locks for this dialect.
`RowLockStrategy`	`getReadRowLockStrategy()`	The row lock strategy to use for read locks.
`String`	`getSelectClauseNullString(int sqlType, TypeConfiguration typeConfiguration)`	Given a JDBC type code, return the expression for a literal null value of that type, to use in a `select` clause.
`SequenceInformationExtractor`	`getSequenceInformationExtractor()`	A `SequenceInformationExtractor` which is able to extract `SequenceInformation` from the JDBC result set returned when `Dialect.getQuerySequencesString()` is executed.
`SequenceSupport`	`getSequenceSupport()`	Get the appropriate `SequenceSupport` for this dialect.
`SqlAstTranslatorFactory`	`getSqlAstTranslatorFactory()`	Return a `SqlAstTranslatorFactory` specific to this dialect, or `null` to use the standard translator.
`TemporaryTableKind`	`getSupportedTemporaryTableKind()`	The kind of temporary tables that are supported on this database.
`BeforeUseAction`	`getTemporaryTableBeforeUseAction()`	The action to take before beginning use of a temporary table.
`String`	`getTemporaryTableCreateCommand()`	The command to create a temporary table.
`String`	`getTemporaryTableCreateOptions()`	An arbitrary SQL fragment appended to the end of the statement to create a temporary table, specifying dialect-specific options, or `null` if there are no options to specify.
`UniqueDelegate`	`getUniqueDelegate()`	Get the `UniqueDelegate` supported by this dialect
`String`	`getWriteLockString(int timeout)`	Get the string to append to `SELECT` statements to acquire pessimistic WRITE locks for this dialect.
`RowLockStrategy`	`getWriteRowLockStrategy()`	The row lock strategy to use for write locks.
`void`	`initializeFunctionRegistry(FunctionContributions functionContributions)`	Initialize the given registry with any dialect-specific functions.
`boolean`	`isCurrentTimestampSelectStringCallable()`	Is the command returned by `Dialect.getCurrentTimestampSelectString()` treated as callable?
`protected void`	`registerColumnTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)`	Register ANSI-standard column types using the length limits defined by `Dialect.getMaxVarcharLength()`, `Dialect.getMaxNVarcharLength()`, and `Dialect.getMaxVarbinaryLength()`.
`protected void`	`registerDefaultKeywords()`	Register the reserved words of ANSI-standard SQL as keywords.
`boolean`	`requiresCastForConcatenatingNonStrings()`	Does this dialect/database require casting of non-string arguments in the `concat()` function?
`boolean`	`supportsCommentOn()`	Does this dialect support commenting on tables and columns?
`boolean`	`supportsCurrentTimestampSelection()`	Does this dialect support some way to retrieve the current timestamp value from the database?
`boolean`	`supportsExistsInSelect()`	Does the dialect support an exists statement in the select clause?
`boolean`	`supportsLobValueChangePropagation()`	Does the dialect support propagating 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`	`supportsLockTimeouts()`	Does this dialect support specifying timeouts when requesting locks.
`boolean`	`supportsOrderByInSubquery()`	Does this dialect support the `order by` clause in subqueries?
`boolean`	`supportsOuterJoinForUpdate()`	Does this dialect support `FOR UPDATE` in conjunction with outer-joined rows?
`boolean`	`supportsPartitionBy()`	Does is dialect support `partition by`?
`boolean`	`supportsResultSetPositionQueryMethodsOnForwardOnlyCursor()`	Does this dialect support asking the result set its positioning information on forward-only cursors?
`boolean`	`supportsTemporaryTablePrimaryKey()`	Does this database support primary keys for temporary tables?
`boolean`	`supportsTupleDistinctCounts()`	Does this dialect support `count(distinct a,b)`?
`boolean`	`supportsUnboundedLobLocatorMaterialization()`	Is it supported to materialize a LOB locator outside the transaction in which it was created?
`boolean`	`supportsWindowFunctions()`	Does this dialect support window functions like `row_number() over (..)`?
`String`	`timestampaddPattern(TemporalUnit unit, TemporalType temporalType, IntervalType intervalType)`	Obtain a pattern for the SQL equivalent to a `timestampadd()` function call.
`String`	`timestampdiffPattern(TemporalUnit unit, TemporalType fromTemporalType, TemporalType toTemporalType)`	Obtain a pattern for the SQL equivalent to a `timestampdiff()` function call.
`String`	`translateExtractField(TemporalUnit unit)`	Return the name used to identify the given field as an argument to the `extract()` function, or of this dialect's equivalent function.

Methods inherited from class org.hibernate.dialect.Dialect
addSqlHintOrComment, appendArrayLiteral, appendBinaryLiteral, appendDateTimeLiteral, appendDateTimeLiteral, appendDateTimeLiteral, appendIntervalLiteral, appendLiteral, appendLockHint, appendUUIDLiteral, applyLocksToSql, augmentPhysicalTableTypes, augmentRecognizedTableTypes, canBatchTruncate, canCreateCatalog, canCreateSchema, canDisableConstraints, castType, checkVersion, closeQuote, contribute, contributeFunctions, createOptionalTableUpdateOperation, currentDate, currentLocalTime, currentLocalTimestamp, currentTime, currentTimestamp, currentTimestampWithTimeZone, defaultScrollMode, doesRepeatableReadCauseReadersToBlockWriters, dropConstraints, equivalentTypes, escapeComment, forceLobAsLastValue, generatedAs, getAddColumnString, getAddColumnSuffixString, getAddForeignKeyConstraintString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAggregateSupport, getAlterColumnTypeString, getAlterTableString, getArrayTypeName, getAuxiliaryDatabaseObjectExporter, getBatchLoadSizingStrategy, getCallableStatementSupport, getCascadeConstraintsString, getCaseInsensitiveLike, getCheckCondition, getCheckCondition, getColumnAliasExtractor, getColumnComment, getCreateCatalogCommand, getCreateIndexString, getCreateIndexTail, getCreateMultisetTableString, getCreateSchemaCommand, getCreateTableString, getCreateTemporaryTableColumnAnnotation, getCreateUserDefinedTypeExtensionsString, getCreateUserDefinedTypeKindString, getCurrentSchemaCommand, getDefaultLobLength, getDefaultNonContextualLobCreation, getDefaultProperties, getDefaultTimestampPrecision, getDefaultUseGetGeneratedKeys, getDisableConstraintsStatement, getDisableConstraintStatement, getDmlTargetColumnQualifierSupport, getDropCatalogCommand, getDropForeignKeyString, getDropTableString, getDropUniqueKeyString, getEnableConstraintsStatement, getEnableConstraintStatement, getEnumTypeDeclaration, getFallbackSchemaManagementTool, getForeignKeyExporter, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateSkipLockedString, getForUpdateSkipLockedString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFractionalSecondPrecisionInNanos, getGroupBySelectItemReferenceStrategy, getHqlTranslator, getIndexExporter, getKeywords, getLobMergeStrategy, getLockingStrategy, getLockRowIdentifier, getLowercaseFunction, getMaxAliasLength, getMaxIdentifierLength, getMaxNVarcharCapacity, getMaxNVarcharLength, getMaxVarbinaryCapacity, getMaxVarbinaryLength, getMultiKeyLoadSizingStrategy, getNameQualifierSupport, getNativeIdentifierGenerationType, getNativeIdentifierGeneratorStrategy, getNativeParameterMarkerStrategy, getNoColumnsInsertString, getNullColumnString, getNullColumnString, getNullOrdering, getParameterCountLimit, getPreferredSqlTypeCodeForArray, getPreferredSqlTypeCodeForBoolean, getQueryHintString, getQueryHintString, getReadLockString, getResultSet, getResultSet, getResultSet, getRowIdColumnString, getSchemaNameResolver, getSelectGUIDString, getSequenceExporter, getSizeStrategy, getSqmTranslatorFactory, getTableCleaner, getTableComment, getTableExporter, getTableMigrator, getTableTypeString, getTemporaryTableAfterUseAction, getTemporaryTableDdlTransactionHandling, getTemporaryTableDropCommand, getTemporaryTableExporter, getTemporaryTableTruncateCommand, getTimeoutInSeconds, getTimeZoneSupport, getTruncateTableStatement, getTruncateTableStatements, getUniqueKeyExporter, getUserDefinedTypeComment, getUserDefinedTypeExporter, getVersion, getViolatedConstraintNameExtractor, getWriteLockString, hasAlterTable, hasDataTypeBeforeGeneratedAs, hasSelfReferentialForeignKeyBug, initDefaultProperties, inlineLiteral, isAnsiNullOn, isEmptyStringTreatedAsNull, isJdbcLogWarningsEnabledByDefault, isLob, isLockTimeoutParameterized, openQuote, ordinal, prependComment, qualifyIndexName, quote, registerKeyword, registerKeywords, registerResultSetOutParameter, registerResultSetOutParameter, requiresFloatCastingOfIntegerDivision, requiresParensForTupleCounts, requiresParensForTupleDistinctCounts, resolveSqlTypeCode, resolveSqlTypeCode, resolveSqlTypeDescriptor, resolveSqlTypeLength, rowId, rowIdSqlType, supportsAlterColumnType, supportsBindAsCallableArgument, supportsBitType, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsDistinctFromPredicate, supportsExpectedLobUsagePattern, supportsFetchClause, supportsFractionalTimestampArithmetic, supportsIfExistsAfterAlterTable, supportsIfExistsAfterConstraintName, supportsIfExistsAfterTableName, supportsIfExistsAfterTypeName, supportsIfExistsBeforeConstraintName, supportsIfExistsBeforeTableName, supportsIfExistsBeforeTypeName, supportsInsertReturning, supportsInsertReturningGeneratedKeys, supportsJdbcConnectionLobCreation, supportsLateral, supportsMaterializedLobAccess, supportsNamedParameters, supportsNoColumnsInsert, supportsNonQueryWithCTE, supportsNoWait, supportsNullPrecedence, supportsOffsetInSubquery, supportsOrdinalSelectItemReference, supportsParametersInInsertSelect, supportsPredicateAsExpression, supportsRecursiveCTE, supportsSkipLocked, supportsStandardArrays, supportsStandardCurrentTimestampFunction, supportsSubqueryInSelect, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTemporalLiteralOffset, supportsTemporaryTables, supportsTruncateWithCast, supportsTupleCounts, supportsUnionAll, supportsUnionInSubquery, supportsValuesList, supportsValuesListForInsert, supportsWait, toBooleanValueString, toQuotedIdentifier, toString, transformSelectString, translateDurationField, trimPattern, useArrayForMultiValuedParameters, useFollowOnLocking, useInputStreamToInsertBlob, useMaterializedLobWhenCapacityExceeded

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - DerbyDialect
```
public DerbyDialect()
```
  - DerbyDialect
```
public DerbyDialect(DatabaseVersion version)
```
  - DerbyDialect
```
public DerbyDialect(DialectResolutionInfo info)
```
- Method Detail
  - getMinimumSupportedVersion
```
protected DatabaseVersion getMinimumSupportedVersion()
```
    Description copied from class: Dialect
    
    Get the version of the SQL dialect that is the minimum supported by this implementation.
    
    Overrides:
    
    getMinimumSupportedVersion in class Dialect
  - columnType
```
protected String columnType(int sqlTypeCode)
```
    Description copied from class: Dialect
    The database column type name for a given JDBC type code defined in Types or SqlTypes. This default implementation returns the ANSI-standard type name.
    This method may be overridden by concrete Dialects as an alternative to Dialect.registerColumnTypes(TypeContributions, ServiceRegistry) for simple registrations.
    Note that:
    
    Implementations of this method are expected to define a sensible mapping forTypes.NCLOB Types.NCHAR, and Types.NVARCHAR. On some database, these types are simply remapped to CLOB, CHAR, and VARCHAR.
    Mappings for Types.TIMESTAMP and Types.TIMESTAMP_WITH_TIMEZONE should support explicit specification of precision if possible.
    As specified by DdlTypeRegistry.getDescriptor(int), this method never receives Types.LONGVARCHAR, Types.LONGNVARCHAR, nor Types.LONGVARBINARY, which are considered synonyms for their non-LONG counterparts.
    On the other hand, the types SqlTypes.LONG32VARCHAR, SqlTypes.LONG32NVARCHAR, and SqlTypes.LONG32VARBINARY are not synonyms, and implementations of this method must define sensible mappings, for example to database-native TEXT or CLOB types.
    Overrides:
    
    columnType in class Dialect
    
    Parameters:
    
    sqlTypeCode - a SQL type code
    
    Returns:
    
    a column type name, with $l, $p, $s placeholders for length, precision, scale
    
    See Also:
    
    SqlTypes
  - registerColumnTypes
```
protected void registerColumnTypes(TypeContributions typeContributions,
                                   ServiceRegistry serviceRegistry)
```
    Description copied from class: Dialect
    
    Register ANSI-standard column types using the length limits defined by Dialect.getMaxVarcharLength(), Dialect.getMaxNVarcharLength(), and Dialect.getMaxVarbinaryLength().
    This method is always called when a Dialect is instantiated.
    
    Overrides:
    
    registerColumnTypes in class Dialect
  - getMaxVarcharLength
```
public int getMaxVarcharLength()
```
    Description copied from class: Dialect
    
    The biggest size value that can be supplied as argument to a Types.VARCHAR-like type.
    For longer column lengths, use some sort of text-like type for the column.
    
    Overrides:
    
    getMaxVarcharLength in class Dialect
  - getMaxVarcharCapacity
```
public int getMaxVarcharCapacity()
```
    Description copied from class: Dialect
    
    The longest possible length of a Types.VARCHAR-like column.
    For longer column lengths, use some sort of clob-like type for the column.
    
    Overrides:
    
    getMaxVarcharCapacity in class Dialect
  - getDefaultDecimalPrecision
```
public int getDefaultDecimalPrecision()
```
    Description copied from class: Dialect
    
    This is the default precision for a generated column mapped to a BigInteger or BigDecimal.
    Usually returns the maximum precision of the database, except when there is no such maximum precision, or the maximum precision is very high.
    
    Overrides:
    
    getDefaultDecimalPrecision in class Dialect
    
    Returns:
    
    the default precision, in decimal digits
  - getNationalizationSupport
```
public NationalizationSupport getNationalizationSupport()
```
    Description copied from class: Dialect
    
    Determines whether this database requires the use of explicitly nationalized character (Unicode) data types.
    That is, whether the use of Types.NCHAR, Types.NVARCHAR, and Types.NCLOB is required for nationalized character data.
    
    Overrides:
    
    getNationalizationSupport in class Dialect
  - getDefaultStatementBatchSize
```
public int getDefaultStatementBatchSize()
```
    Description copied from class: Dialect
    
    The default value to use for the configuration property "hibernate.jdbc.batch_size".
    
    Overrides:
    
    getDefaultStatementBatchSize in class Dialect
  - getFloatPrecision
```
public int getFloatPrecision()
```
    Description copied from class: Dialect
    
    This is the default precision for a generated column mapped to a Java Float or float. That is, a value representing "single precision".
    Usually 24 binary digits, at least for databases with a conventional interpretation of the ANSI SQL specification.
    
    Overrides:
    
    getFloatPrecision in class Dialect
    
    Returns:
    
    a value representing "single precision", usually in binary digits, but sometimes in decimal digits
  - getDoublePrecision
```
public int getDoublePrecision()
```
    Description copied from class: Dialect
    
    This is the default precision for a generated column mapped to a Java Double or double. That is, a value representing "double precision".
    Usually 53 binary digits, at least for databases with a conventional interpretation of the ANSI SQL specification.
    
    Overrides:
    
    getDoublePrecision in class Dialect
    
    Returns:
    
    a value representing "double precision", usually in binary digits, but sometimes in decimal digits
  - initializeFunctionRegistry
```
public void initializeFunctionRegistry(FunctionContributions functionContributions)
```
    Description copied from class: Dialect
    Initialize the given registry with any dialect-specific functions.
    Support for certain SQL functions is required, and if the database does not support a required function, then the dialect must define a way to emulate it.
    These required functions include the functions defined by the JPA query language specification:
    
    avg(arg) - aggregate function
    count([distinct ]arg) - aggregate function
    max(arg) - aggregate function
    min(arg) - aggregate function
    sum(arg) - aggregate function
    
    coalesce(arg0, arg1, ...)
    nullif(arg0, arg1)
    
    lower(arg)
    upper(arg)
    length(arg)
    concat(arg0, arg1, ...)
    locate(pattern, string[, start])
    substring(string, start[, length])
    trim([[spec ][character ]from] string)
    
    abs(arg)
    mod(arg0, arg1)
    sqrt(arg)
    
    current date
    current time
    current timestamp
    Along with an additional set of functions defined by ANSI SQL:
    
    any(arg) - aggregate function
    every(arg) - aggregate function
    
    var_samp(arg) - aggregate function
    var_pop(arg) - aggregate function
    stddev_samp(arg) - aggregate function
    stddev_pop(arg) - aggregate function
    
    cast(arg as Type)
    extract(field from arg)
    
    ln(arg)
    exp(arg)
    power(arg0, arg1)
    floor(arg)
    ceiling(arg)
    
    position(pattern in string)
    substring(string from start[ for length])
    overlay(string placing replacement from start[ for length])
    And the following functions for working with java.time types:
    
    local date
    local time
    local datetime
    offset datetime
    instant
    And a number of additional "standard" functions:
    
    left(string, length)
    right(string, length)
    replace(string, pattern, replacement)
    pad(string with length spec[ character])
    
    pi
    log10(arg)
    log(base, arg)
    sign(arg)
    sin(arg)
    cos(arg)
    tan(arg)
    asin(arg)
    acos(arg)
    atan(arg)
    atan2(arg0, arg1)
    round(arg0[, arg1])
    truncate(arg0[, arg1])
    sinh(arg)
    tanh(arg)
    cosh(arg)
    least(arg0, arg1, ...)
    greatest(arg0, arg1, ...)
    degrees(arg)
    radians(arg)
    
    format(datetime as pattern)
    collate(string as collation)
    str(arg) - synonym of cast(a as String)
    ifnull(arg0, arg1) - synonym of coalesce(a, b)
    Finally, the following functions are defined as abbreviations for extract(), and desugared by the parser:
    
    second(arg) - synonym of extract(second from a)
    minute(arg) - synonym of extract(minute from a)
    hour(arg) - synonym of extract(hour from a)
    day(arg) - synonym of extract(day from a)
    month(arg) - synonym of extract(month from a)
    year(arg) - synonym of extract(year from a)
    Note that according to this definition, the second() function returns a floating point value, contrary to the integer type returned by the native function with this name on many databases. Thus, we don't just naively map these HQL functions to the native SQL functions with the same names.
    Overrides:
    
    initializeFunctionRegistry in class Dialect
  - getSqlAstTranslatorFactory
```
public SqlAstTranslatorFactory getSqlAstTranslatorFactory()
```
    Description copied from class: Dialect
    
    Return a SqlAstTranslatorFactory specific to this dialect, or null to use the standard translator.
    
    Overrides:
    
    getSqlAstTranslatorFactory in class Dialect
    
    See Also:
    
    StandardSqlAstTranslatorFactory, JdbcEnvironment.getSqlAstTranslatorFactory()
  - extractPattern
```
public String extractPattern(TemporalUnit unit)
```
    Derby doesn't have an extract() function, and has no functions at all for calendaring, but we can emulate the most basic functionality of extract() using the functions it does have. The only supported TemporalUnits are: TemporalUnit.YEAR, TemporalUnit.MONTH TemporalUnit.DAY, TemporalUnit.HOUR, TemporalUnit.MINUTE, TemporalUnit.SECOND (along with TemporalUnit.NANOSECOND, TemporalUnit.DATE, and TemporalUnit.TIME, which are desugared by the parser).
    
    Overrides:
    
    extractPattern in class Dialect
    
    Parameters:
    
    unit - the first argument
  - translateExtractField
```
public String translateExtractField(TemporalUnit unit)
```
    Description copied from class: Dialect
    
    Return the name used to identify the given field as an argument to the extract() function, or of this dialect's equivalent function.
    This method does not need to handle TemporalUnit.NANOSECOND, TemporalUnit.NATIVE, TemporalUnit.OFFSET, TemporalUnit.DATE, TemporalUnit.TIME, TemporalUnit.WEEK_OF_YEAR, nor TemporalUnit.WEEK_OF_MONTH, which are already desugared by ExtractFunction.
    
    Overrides:
    
    translateExtractField in class Dialect
  - castPattern
```
public String castPattern(CastType from,
                          CastType to)
```
    Derby does have a real Types.BOOLEAN type, but it doesn't know how to cast to it. Worse, Derby makes us use the double() function to cast things to its floating point types.
    
    Overrides:
    
    castPattern in class Dialect
    
    Parameters:
    
    from - a CastType indicating the type of the value argument
    
    to - a CastType indicating the type the value argument is cast to
  - timestampaddPattern
```
public String timestampaddPattern(TemporalUnit unit,
                                  TemporalType temporalType,
                                  IntervalType intervalType)
```
    Description copied from class: Dialect
    
    Obtain a pattern for the SQL equivalent to a timestampadd() function call. The resulting pattern must contain ?1, ?2, and ?3 placeholders for the arguments.
    
    Overrides:
    
    timestampaddPattern in class Dialect
    
    Parameters:
    
    unit - The unit to add to the temporal
    
    temporalType - The type of the temporal
    
    intervalType - The type of interval to add or null if it's not a native interval
  - timestampdiffPattern
```
public String timestampdiffPattern(TemporalUnit unit,
                                   TemporalType fromTemporalType,
                                   TemporalType toTemporalType)
```
    Description copied from class: Dialect
    
    Obtain a pattern for the SQL equivalent to a timestampdiff() function call. The resulting pattern must contain ?1, ?2, and ?3 placeholders for the arguments.
    
    Overrides:
    
    timestampdiffPattern in class Dialect
    
    Parameters:
    
    unit - the first argument
    
    fromTemporalType - true if the first argument is a timestamp, false if a date
    
    toTemporalType - true if the second argument is
  - appendBooleanValueString
```
public void appendBooleanValueString(SqlAppender appender,
                                     boolean bool)
```
    Description copied from class: Dialect
    
    Append the SQL literal expression representing the given boolean value to the given SqlAppender.
    
    Overrides:
    
    appendBooleanValueString in class Dialect
    
    Parameters:
    
    appender - The SqlAppender to append the literal expression to
    
    bool - The boolean value
  - getSequenceSupport
```
public SequenceSupport getSequenceSupport()
```
    Description copied from class: Dialect
    
    Get the appropriate SequenceSupport for this dialect.
    
    Overrides:
    
    getSequenceSupport in class Dialect
  - 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.
  - getSequenceInformationExtractor
```
public SequenceInformationExtractor getSequenceInformationExtractor()
```
    Description copied from class: Dialect
    
    A SequenceInformationExtractor which is able to extract SequenceInformation from the JDBC result set returned when Dialect.getQuerySequencesString() is executed.
    
    Overrides:
    
    getSequenceInformationExtractor in class Dialect
  - getDropSchemaCommand
```
public String[] getDropSchemaCommand(String schemaName)
```
    Description copied from class: Dialect
    
    Get the SQL command used to drop the named schema.
    
    Overrides:
    
    getDropSchemaCommand in class Dialect
    
    Parameters:
    
    schemaName - The name of the schema to be dropped.
    
    Returns:
    
    The drop commands
  - getSelectClauseNullString
```
public String getSelectClauseNullString(int sqlType,
                                        TypeConfiguration typeConfiguration)
```
    Description copied from class: Dialect
    
    Given a JDBC type code, return the expression for a literal null value of that type, to use in a select clause.
    The select query will be an element of a UNION or UNION ALL.
    
    Overrides:
    
    getSelectClauseNullString in class Dialect
    
    Parameters:
    
    sqlType - The Types type code.
    
    typeConfiguration - The type configuration
    
    Returns:
    
    The appropriate select clause value fragment.
  - supportsCommentOn
```
public boolean supportsCommentOn()
```
    Description copied from class: Dialect
    
    Does this dialect support commenting on tables and columns?
    
    Overrides:
    
    supportsCommentOn in class Dialect
    
    Returns:
    
    true if commenting is supported
  - getWriteRowLockStrategy
```
public RowLockStrategy getWriteRowLockStrategy()
```
    Description copied from class: Dialect
    
    The row lock strategy to use for write locks.
    
    Overrides:
    
    getWriteRowLockStrategy in class Dialect
  - getReadRowLockStrategy
```
public RowLockStrategy getReadRowLockStrategy()
```
    Description copied from class: Dialect
    
    The row lock strategy to use for read locks.
    
    Overrides:
    
    getReadRowLockStrategy in class Dialect
  - getForUpdateString
```
public String getForUpdateString()
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire pessimistic UPGRADE locks for this dialect.
    
    Overrides:
    
    getForUpdateString in class Dialect
    
    Returns:
    
    The appropriate FOR UPDATE clause string.
  - getWriteLockString
```
public String getWriteLockString(int timeout)
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire pessimistic WRITE locks for this dialect.
    Location of the returned string is treated the same as Dialect.getForUpdateString().
    
    Overrides:
    
    getWriteLockString in class Dialect
    
    Parameters:
    
    timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.
    
    Returns:
    
    The appropriate LOCK clause string.
  - getReadLockString
```
public String getReadLockString(int timeout)
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire READ locks for this dialect.
    Location of the returned string is treated the same as Dialect.getForUpdateString().
    
    Overrides:
    
    getReadLockString in class Dialect
    
    Parameters:
    
    timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.
    
    Returns:
    
    The appropriate LOCK clause string.
  - 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.
  - supportsExistsInSelect
```
public boolean supportsExistsInSelect()
```
    Description copied from class: Dialect
    
    Does the dialect support an exists statement in the select clause?
    
    Overrides:
    
    supportsExistsInSelect in class Dialect
    
    Returns:
    
    True if exists checks are allowed in the select clause; false otherwise.
  - supportsLockTimeouts
```
public boolean supportsLockTimeouts()
```
    Description copied from class: Dialect
    
    Does this dialect support specifying timeouts when requesting locks.
    
    Overrides:
    
    supportsLockTimeouts in class Dialect
    
    Returns:
    
    True is this dialect supports specifying lock timeouts.
  - supportsCurrentTimestampSelection
```
public boolean supportsCurrentTimestampSelection()
```
    Description copied from class: Dialect
    
    Does this dialect support some way to retrieve the current timestamp value from the database?
    
    Overrides:
    
    supportsCurrentTimestampSelection in class Dialect
    
    Returns:
    
    True if the current timestamp can be retrieved; false otherwise.
  - getCurrentTimestampSelectString
```
public String getCurrentTimestampSelectString()
```
    Description copied from class: Dialect
    
    The command used to retrieve the current timestamp from the database.
    
    Overrides:
    
    getCurrentTimestampSelectString in class Dialect
  - isCurrentTimestampSelectStringCallable
```
public boolean isCurrentTimestampSelectStringCallable()
```
    Description copied from class: Dialect
    
    Is the command returned by Dialect.getCurrentTimestampSelectString() treated as callable?
    Typically, this indicates the use of the JDBC escape syntax.
    
    Overrides:
    
    isCurrentTimestampSelectStringCallable in class Dialect
    
    Returns:
    
    if the Dialect.getCurrentTimestampSelectString() is treated as callable; false otherwise.
  - getLimitHandler
```
public LimitHandler getLimitHandler()
```
    Description copied from class: Dialect
    
    Obtain a LimitHandler that implements pagination support for Query.setMaxResults(int) and Query.setFirstResult(int).
    
    Overrides:
    
    getLimitHandler in class Dialect
  - getIdentityColumnSupport
```
public IdentityColumnSupport getIdentityColumnSupport()
```
    Description copied from class: Dialect
    
    Get the appropriate IdentityColumnSupport for this dialect.
    
    Overrides:
    
    getIdentityColumnSupport in class Dialect
    
    Returns:
    
    the IdentityColumnSupport
  - 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.
  - supportsResultSetPositionQueryMethodsOnForwardOnlyCursor
```
public boolean supportsResultSetPositionQueryMethodsOnForwardOnlyCursor()
```
    Description copied from class: Dialect
    
    Does this dialect support asking the result set its positioning information on forward-only cursors?
    Specifically, in the case of scrolling fetches, Hibernate needs to use ResultSet.isAfterLast() and ResultSet.isBeforeFirst(). Certain drivers do not allow access to these methods for forward-only cursors.
    
    Overrides:
    
    supportsResultSetPositionQueryMethodsOnForwardOnlyCursor in class Dialect
    
    Returns:
    
    True if methods like ResultSet.isAfterLast() and ResultSet.isBeforeFirst() are supported for forward only cursors; false otherwise.
  - supportsTupleDistinctCounts
```
public boolean supportsTupleDistinctCounts()
```
    Description copied from class: Dialect
    
    Does this dialect support count(distinct a,b)?
    
    Overrides:
    
    supportsTupleDistinctCounts in class Dialect
    
    Returns:
    
    True if the database supports counting distinct tuples; false otherwise.
  - supportsOrderByInSubquery
```
public boolean supportsOrderByInSubquery()
```
    Description copied from class: Dialect
    Does this dialect support the order by clause in subqueries?
    For example:
    select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1)
    Overrides:
    
    supportsOrderByInSubquery in class Dialect
    
    Returns:
    
    true if it does
  - requiresCastForConcatenatingNonStrings
```
public boolean requiresCastForConcatenatingNonStrings()
```
    Description copied from class: Dialect
    
    Does this dialect/database require casting of non-string arguments in the concat() function?
    
    Overrides:
    
    requiresCastForConcatenatingNonStrings in class Dialect
    
    Returns:
    
    true if casting using cast() is required
  - contributeTypes
```
public void contributeTypes(TypeContributions typeContributions,
                            ServiceRegistry serviceRegistry)
```
    Description copied from class: Dialect
    
    A callback which allows the Dialect to contribute types.
    
    Overrides:
    
    contributeTypes in class Dialect
    
    Parameters:
    
    typeContributions - Callback to contribute the types
    
    serviceRegistry - The service registry
  - supportsLobValueChangePropagation
```
public boolean supportsLobValueChangePropagation()
```
    Description copied from class: Dialect
    Does the dialect support propagating 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).
    Overrides:
    
    supportsLobValueChangePropagation in class Dialect
    
    Returns:
    
    True if the changes are propagated back to the database; false otherwise.
  - supportsUnboundedLobLocatorMaterialization
```
public boolean supportsUnboundedLobLocatorMaterialization()
```
    Description copied from class: Dialect
    
    Is it supported to materialize a LOB locator outside the transaction in which it was created?
    
    Overrides:
    
    supportsUnboundedLobLocatorMaterialization in class Dialect
    
    Returns:
    
    True if unbounded materialization is supported; false otherwise.
  - getInExpressionCountLimit
```
public int getInExpressionCountLimit()
```
    Description copied from class: Dialect
    
    Return the limit that the underlying database places on the number of elements in an IN predicate. If the database defines no such limits, simply return zero or a number smaller than zero.
    
    Overrides:
    
    getInExpressionCountLimit in class Dialect
    
    Returns:
    
    The limit, or a non-positive integer to indicate no limit.
  - buildSQLExceptionConversionDelegate
```
public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate()
```
    Description copied from class: Dialect
    An instance of SQLExceptionConversionDelegate for interpreting dialect-specific error or SQLState codes.
    If this method is overridden to return a non-null value, the default SQLExceptionConverter will use the returned SQLExceptionConversionDelegate in addition to the following standard delegates:
    
    a "static" delegate based on the JDBC4-defined SQLException hierarchy, and
    a delegate that interprets SQLState codes as either X/Open or SQL-2003 codes, depending on what is reported by the JDBC driver.
    
    It is strongly recommended that every Dialect implementation override this method, since interpretation of a SQL error is much more accurate when based on the vendor-specific error code, rather than on the SQLState.
    Overrides:
    
    buildSQLExceptionConversionDelegate in class Dialect
    
    Returns:
    
    The SQLExceptionConversionDelegate for this dialect
  - appendDatetimeFormat
```
public void appendDatetimeFormat(SqlAppender appender,
                                 String format)
```
    Description copied from class: Dialect
    Translate the given datetime format string from the pattern language defined by Java's DateTimeFormatter to whatever pattern language is understood by the native datetime formatting function for this database (often the to_char() function).
    Since it's never possible to translate every pattern letter sequences understood by DateTimeFormatter, only the following subset of pattern letters is accepted by Hibernate:
    
    G: era
    
    y: year of era
    
    Y: year of week-based year
    
    M: month of year
    
    w: week of week-based year (ISO week number)
    
    W: week of month
    
    E: day of week (name)
    
    e: day of week (number)
    
    d: day of month
    
    D: day of year
    
    a: AM/PM
    
    H: hour of day (24 hour time)
    
    h: hour of AM/PM (12 hour time)
    
    m: minutes
    
    s: seconds
    
    z,Z,x: timezone offset
    
    In addition, punctuation characters and single-quoted literal strings are accepted.
    Appends a pattern accepted by the function that formats dates and times in this dialect to a SQL fragment that is being constructed.
    Overrides:
    
    appendDatetimeFormat in class Dialect
  - registerDefaultKeywords
```
protected void registerDefaultKeywords()
```
    Description copied from class: Dialect
    
    Register the reserved words of ANSI-standard SQL as keywords.
    
    Overrides:
    
    registerDefaultKeywords in class Dialect
    
    See Also:
    
    AnsiSqlKeywords
  - getFallbackSqmMutationStrategy
```
public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor,
                                                                    RuntimeModelCreationContext runtimeModelCreationContext)
```
    The SqmMultiTableMutationStrategy to use when not specified by QueryEngineOptions.getCustomSqmMultiTableMutationStrategy().
    From Derby docs:
    The DECLARE GLOBAL TEMPORARY TABLE statement defines a temporary table for the current connection.
    
    DB2Dialect returns a GlobalTemporaryTableMutationStrategy that will make temporary tables created at startup and hence unavailable for subsequent connections.
    see HHH-10238.
    Overrides:
    
    getFallbackSqmMutationStrategy in class Dialect
    
    See Also:
    
    SqmMultiTableMutationStrategyProvider.createMutationStrategy(org.hibernate.metamodel.mapping.EntityMappingType, org.hibernate.metamodel.mapping.internal.MappingModelCreationProcess)
  - getFallbackSqmInsertStrategy
```
public SqmMultiTableInsertStrategy getFallbackSqmInsertStrategy(EntityMappingType rootEntityDescriptor,
                                                                RuntimeModelCreationContext runtimeModelCreationContext)
```
    Description copied from class: Dialect
    
    The SqmMultiTableInsertStrategy to use when not specified by QueryEngineOptions.getCustomSqmMultiTableInsertStrategy().
    
    Overrides:
    
    getFallbackSqmInsertStrategy in class Dialect
    
    See Also:
    
    SqmMultiTableMutationStrategyProvider.createInsertStrategy(org.hibernate.metamodel.mapping.EntityMappingType, org.hibernate.metamodel.mapping.internal.MappingModelCreationProcess)
  - getSupportedTemporaryTableKind
```
public TemporaryTableKind getSupportedTemporaryTableKind()
```
    Description copied from class: Dialect
    
    The kind of temporary tables that are supported on this database.
    
    Overrides:
    
    getSupportedTemporaryTableKind in class Dialect
  - getTemporaryTableCreateOptions
```
public String getTemporaryTableCreateOptions()
```
    Description copied from class: Dialect
    
    An arbitrary SQL fragment appended to the end of the statement to create a temporary table, specifying dialect-specific options, or null if there are no options to specify.
    
    Overrides:
    
    getTemporaryTableCreateOptions in class Dialect
  - supportsTemporaryTablePrimaryKey
```
public boolean supportsTemporaryTablePrimaryKey()
```
    Description copied from class: Dialect
    
    Does this database support primary keys for temporary tables?
    
    Overrides:
    
    supportsTemporaryTablePrimaryKey in class Dialect
    
    Returns:
    
    true by default, since most do
  - getTemporaryTableCreateCommand
```
public String getTemporaryTableCreateCommand()
```
    Description copied from class: Dialect
    
    The command to create a temporary table.
    
    Overrides:
    
    getTemporaryTableCreateCommand in class Dialect
  - getTemporaryTableBeforeUseAction
```
public BeforeUseAction getTemporaryTableBeforeUseAction()
```
    Description copied from class: Dialect
    
    The action to take before beginning use of a temporary table.
    
    Overrides:
    
    getTemporaryTableBeforeUseAction in class Dialect
  - supportsPartitionBy
```
public boolean supportsPartitionBy()
```
    Description copied from class: Dialect
    
    Does is dialect support partition by?
    
    Overrides:
    
    supportsPartitionBy in class Dialect
  - supportsWindowFunctions
```
public boolean supportsWindowFunctions()
```
    Description copied from class: Dialect
    
    Does this dialect support window functions like row_number() over (..)?
    
    Overrides:
    
    supportsWindowFunctions in class Dialect
    
    Returns:
    
    true if the underlying database supports window functions, false otherwise. The default is false.
  - buildIdentifierHelper
```
public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder,
                                              DatabaseMetaData dbMetaData)
                                       throws SQLException
```
    Description copied from class: Dialect
    The IdentifierHelper indicated by this dialect for handling identifier conversions. Returning null is allowed and indicates that Hibernate should fall back to building a "standard" helper. In the fallback path, any changes made to the IdentifierHelperBuilder during this call will still be incorporated into the built IdentifierHelper.
    The incoming builder will have the following set:
    
    IdentifierHelperBuilder.isGloballyQuoteIdentifiers()
    
    IdentifierHelperBuilder.getUnquotedCaseStrategy() - initialized to UPPER
    
    IdentifierHelperBuilder.getQuotedCaseStrategy() - initialized to MIXED
    
    By default, Hibernate will do the following:
    
    Call IdentifierHelperBuilder.applyIdentifierCasing(DatabaseMetaData)
    Call IdentifierHelperBuilder.applyReservedWords(DatabaseMetaData)
    Applies AnsiSqlKeywords.sql2003() as reserved words
    
    Applies the {#link #sqlKeywords} collected here as reserved words
    
    Applies the Dialect's NameQualifierSupport, if it defines one
    Overrides:
    
    buildIdentifierHelper in class Dialect
    
    Parameters:
    
    builder - A partially-configured IdentifierHelperBuilder.
    
    dbMetaData - Access to the metadata returned from the driver if needed and if available. WARNING: it may be null.
    
    Returns:
    
    The IdentifierHelper instance to use, or null to indicate Hibernate should use its fallback path
    
    Throws:
    
    SQLException - Accessing the DatabaseMetaData can throw it. Just rethrow and Hibernate will handle it.
    
    See Also:
    
    Dialect.getNameQualifierSupport()
  - getUniqueDelegate
```
public UniqueDelegate getUniqueDelegate()
```
    Description copied from class: Dialect
    
    Get the UniqueDelegate supported by this dialect
    
    Overrides:
    
    getUniqueDelegate in class Dialect
    
    Returns:
    
    The UniqueDelegate

Constructor	Description
`DerbyDialect()`
`DerbyDialect(DatabaseVersion version)`
`DerbyDialect(DialectResolutionInfo info)`

Class DerbyDialect

Nested Class Summary

Nested classes/interfaces inherited from class org.hibernate.dialect.Dialect

Field Summary

Fields inherited from class org.hibernate.dialect.Dialect

Constructor Summary

Method Summary

Methods inherited from class org.hibernate.dialect.Dialect

Methods inherited from class java.lang.Object

Constructor Detail

DerbyDialect

DerbyDialect

DerbyDialect

Method Detail

getMinimumSupportedVersion

columnType

registerColumnTypes

getMaxVarcharLength

getMaxVarcharCapacity

getDefaultDecimalPrecision

getNationalizationSupport

getDefaultStatementBatchSize

getFloatPrecision

getDoublePrecision

initializeFunctionRegistry

getSqlAstTranslatorFactory

extractPattern

translateExtractField

castPattern

timestampaddPattern

timestampdiffPattern

appendBooleanValueString

getSequenceSupport

getQuerySequencesString

getSequenceInformationExtractor

getDropSchemaCommand

getSelectClauseNullString

supportsCommentOn

getWriteRowLockStrategy

getReadRowLockStrategy

getForUpdateString

getWriteLockString

getReadLockString

supportsOuterJoinForUpdate

supportsExistsInSelect

supportsLockTimeouts

supportsCurrentTimestampSelection

getCurrentTimestampSelectString

isCurrentTimestampSelectStringCallable

getLimitHandler

getIdentityColumnSupport

doesReadCommittedCauseWritersToBlockReaders

supportsResultSetPositionQueryMethodsOnForwardOnlyCursor

supportsTupleDistinctCounts

supportsOrderByInSubquery

requiresCastForConcatenatingNonStrings

contributeTypes

supportsLobValueChangePropagation

supportsUnboundedLobLocatorMaterialization

getInExpressionCountLimit

buildSQLExceptionConversionDelegate

appendDatetimeFormat

registerDefaultKeywords

getFallbackSqmMutationStrategy

getFallbackSqmInsertStrategy

getSupportedTemporaryTableKind

getTemporaryTableCreateOptions

supportsTemporaryTablePrimaryKey

getTemporaryTableCreateCommand

getTemporaryTableBeforeUseAction

supportsPartitionBy

supportsWindowFunctions

buildIdentifierHelper

getUniqueDelegate