Class AbstractHANADialect
- java.lang.Object
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- org.hibernate.dialect.Dialect
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- org.hibernate.dialect.AbstractHANADialect
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- All Implemented Interfaces:
FunctionContributor
,TypeContributor
,ConversionContext
- Direct Known Subclasses:
HANAColumnStoreDialect
,HANARowStoreDialect
public abstract class AbstractHANADialect extends Dialect
An abstract base class for SAP HANA dialects.For more information on interacting with the SAP HANA database, refer to the SAP HANA SQL and System Views Reference and the SAP HANA Client Interface Programming Reference.
Note: This dialect is configured to create foreign keys with
on update cascade
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
AbstractHANADialect.HANABlobType
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Nested classes/interfaces inherited from class org.hibernate.dialect.Dialect
Dialect.SizeStrategy, Dialect.SizeStrategyImpl
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Field Summary
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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
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Constructor Summary
Constructors Constructor Description AbstractHANADialect(DatabaseVersion version)
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Method Summary
All Methods Static Methods Instance Methods Abstract 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 givenSqlAppender
.void
appendDatetimeFormat(SqlAppender appender, String format)
Translate the given datetime format string from the pattern language defined by Java'sDateTimeFormatter
to whatever pattern language is understood by the native datetime formatting function for this database (often theto_char()
function).void
appendDateTimeLiteral(SqlAppender appender, TemporalAccessor temporalAccessor, TemporalType precision, TimeZone jdbcTimeZone)
Append a datetime literal representing the givenjava.time
value to the givenSqlAppender
.void
appendDateTimeLiteral(SqlAppender appender, Date date, TemporalType precision, TimeZone jdbcTimeZone)
Append a datetime literal representing the givenDate
value to the givenSqlAppender
.IdentifierHelper
buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)
TheIdentifierHelper
indicated by this dialect for handling identifier conversions.SQLExceptionConversionDelegate
buildSQLExceptionConversionDelegate()
An instance ofSQLExceptionConversionDelegate
for interpreting dialect-specific error or SQLState codes.String
castPattern(CastType from, CastType to)
Obtain a pattern for the SQL equivalent to acast()
function call.protected String
columnType(int sqlTypeCode)
void
contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)
A callback which allows theDialect
to contribute types.protected static DatabaseVersion
createVersion(DialectResolutionInfo info)
ScrollMode
defaultScrollMode()
A defaultScrollMode
to be used byQuery.scroll()
.boolean
dropConstraints()
Do we need to drop constraints before dropping tables in this dialect?String
extractPattern(TemporalUnit unit)
HANA has no extract() function, but we can emulate it using the appropriate named functions instead of extract().String
generatedAs(String generatedAs)
Thegenerated as
clause, or similar, for generated column declarations in DDL statements.String
getAddColumnString()
The subcommand of thealter table
command used to add a column to a table, usuallyadd column
oradd
.String
getAddColumnSuffixString()
The syntax for the suffix used to add a column to a table.JdbcType
getBlobTypeDescriptor()
CallableStatementSupport
getCallableStatementSupport()
TheCallableStatementSupport
for this database.String
getCascadeConstraintsString()
The keyword that specifies that adrop table
operation should be cascaded to its constraints, typically" cascade"
where the leading space is required, or the empty string if there is no such keyword in this dialect.String
getColumnComment(String comment)
Get the comment into a form supported for column definition.String
getCurrentSchemaCommand()
Get the SQL command used to retrieve the current schema name.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 aBigInteger
orBigDecimal
.boolean
getDefaultNonContextualLobCreation()
The default value to use for the configuration property "hibernate.jdbc.lob.non_contextual_creation".boolean
getDefaultUseGetGeneratedKeys()
The default value to use for the configuration property "hibernate.jdbc.use_get_generated_keys".String
getForUpdateNowaitString()
Retrieves theFOR UPDATE NOWAIT
syntax specific to this dialect.String
getForUpdateNowaitString(String aliases)
Get theFOR UPDATE OF column_list NOWAIT
fragment appropriate for this dialect, given the aliases of the columns to be write locked.String
getForUpdateString(String aliases)
Get theFOR UPDATE OF column_list
fragment appropriate for this dialect, given the aliases of the columns to be write locked.String
getForUpdateString(String aliases, LockOptions lockOptions)
Get theFOR UPDATE OF
orFOR SHARE OF
fragment appropriate for this dialect, given the aliases of the columns to be locked.long
getFractionalSecondPrecisionInNanos()
The "native" precision for arithmetic with datetimes and day-to-second durations.IdentityColumnSupport
getIdentityColumnSupport()
Get the appropriateIdentityColumnSupport
for this dialect.LimitHandler
getLimitHandler()
Obtain aLimitHandler
that implements pagination support forQuery.setMaxResults(int)
andQuery.setFirstResult(int)
.int
getMaxAliasLength()
What is the maximum length Hibernate can use for generated aliases?int
getMaxIdentifierLength()
What is the maximum identifier length supported by this dialect?int
getMaxNVarcharLength()
The biggest size value that can be supplied as argument to aTypes.NVARCHAR
-like type.int
getMaxVarbinaryLength()
The biggest size value that can be supplied as argument to aTypes.VARBINARY
-like type.int
getMaxVarcharLength()
The biggest size value that can be supplied as argument to aTypes.VARCHAR
-like type.NameQualifierSupport
getNameQualifierSupport()
NullOrdering
getNullOrdering()
Returns the default ordering of null.String
getQueryHintString(String query, List<String> hints)
Apply a hint to the given SQL query.String
getQuerySequencesString()
Get theselect
command used retrieve the names of all sequences.String
getReadLockString(int timeout)
Get the string to append toSELECT
statements to acquire READ locks for this dialect.String
getReadLockString(String aliases, int timeout)
Get the string to append toSELECT
statements to acquire READ locks for this dialect, given the aliases of the columns to be read locked.String
getSelectGUIDString()
Get the command used to select a GUID from the database.SequenceInformationExtractor
getSequenceInformationExtractor()
ASequenceInformationExtractor
which is able to extractSequenceInformation
from the JDBC result set returned whenDialect.getQuerySequencesString()
is executed.SequenceSupport
getSequenceSupport()
Get the appropriateSequenceSupport
for this dialect.SqlAstTranslatorFactory
getSqlAstTranslatorFactory()
String
getTableComment(String comment)
Get the comment into a form supported for table definition.Exporter<Table>
getTableExporter()
String
getWriteLockString(int timeout)
Get the string to append toSELECT
statements to acquire pessimistic WRITE locks for this dialect.String
getWriteLockString(String aliases, int timeout)
Get the string to append toSELECT
statements to acquire WRITE locks for this dialect, given the aliases of the columns to be write locked.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 byDialect.getCurrentTimestampSelectString()
treated as callable?boolean
isUseUnicodeStringTypes()
protected void
registerColumnTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)
Register ANSI-standard column types using the length limits defined byDialect.getMaxVarcharLength()
,Dialect.getMaxNVarcharLength()
, andDialect.getMaxVarbinaryLength()
.protected void
registerDefaultKeywords()
Register the reserved words of ANSI-standard SQL as keywords.int
registerResultSetOutParameter(CallableStatement statement, int position)
Registers a parameter capable of returning aResultSet
by position, either anOUT
parameter, or aREF_CURSOR
parameter as defined in Java 8.int
registerResultSetOutParameter(CallableStatement statement, String name)
Registers a parameter capable of returning aResultSet
by name, either anOUT
parameter, or aREF_CURSOR
parameter as defined in Java 8.protected abstract boolean
supportsAsciiStringTypes()
boolean
supportsColumnCheck()
HANA currently does not support check constraints.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
supportsExpectedLobUsagePattern()
"Expected" LOB usage pattern is such that I can perform an insert via prepared statement with a parameter binding for a LOB value without crazy casting to JDBC driver implementation-specific classes.boolean
supportsFractionalTimestampArithmetic()
Whether the database supports adding a fractional interval to a timestamp, for exampletimestamp + 0.5 second
.boolean
supportsJdbcConnectionLobCreation(DatabaseMetaData databaseMetaData)
Check whether the JDBCConnection
supports creating LOBs viaConnection.createBlob()
,Connection.createNClob()
, orConnection.createClob()
.boolean
supportsLateral()
Does this dialect support the SQLlateral
keyword or a proprietary alternative?boolean
supportsNoColumnsInsert()
Is theINSERT
statement is allowed to contain no columns?boolean
supportsNoWait()
Does this dialect supportNO_WAIT
timeout.boolean
supportsOffsetInSubquery()
Does this dialect supportoffset
in subqueries?boolean
supportsOrderByInSubquery()
Does this dialect support theorder by
clause in subqueries?boolean
supportsPartitionBy()
Does is dialect supportpartition by
?boolean
supportsTableCheck()
Does this dialect support table-level check constraints?boolean
supportsTupleDistinctCounts()
Does this dialect supportcount(distinct a,b)
?boolean
supportsUnboundedLobLocatorMaterialization()
Is it supported to materialize a LOB locator outside the transaction in which it was created?boolean
supportsValuesListForInsert()
Does this dialect supportvalues
lists of formVALUES (1), (2), (3)
in insert statements?boolean
supportsWindowFunctions()
Does this dialect support window functions likerow_number() over (..)
?String
timestampaddPattern(TemporalUnit unit, TemporalType temporalType, IntervalType intervalType)
Obtain a pattern for the SQL equivalent to atimestampadd()
function call.String
timestampdiffPattern(TemporalUnit unit, TemporalType fromTemporalType, TemporalType toTemporalType)
Obtain a pattern for the SQL equivalent to atimestampdiff()
function call.protected abstract Boolean
useUnicodeStringTypesDefault()
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Methods inherited from class org.hibernate.dialect.Dialect
addSqlHintOrComment, appendArrayLiteral, appendBinaryLiteral, appendDateTimeLiteral, appendIntervalLiteral, appendLiteral, appendLockHint, appendUUIDLiteral, applyLocksToSql, augmentPhysicalTableTypes, augmentRecognizedTableTypes, canBatchTruncate, canCreateCatalog, canCreateSchema, canDisableConstraints, castType, checkVersion, closeQuote, contribute, contributeFunctions, createOptionalTableUpdateOperation, currentDate, currentLocalTime, currentLocalTimestamp, currentTime, currentTimestamp, currentTimestampWithTimeZone, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, equivalentTypes, escapeComment, forceLobAsLastValue, getAddForeignKeyConstraintString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAggregateSupport, getAlterColumnTypeString, getAlterTableString, getArrayTypeName, getAuxiliaryDatabaseObjectExporter, getBatchLoadSizingStrategy, getCaseInsensitiveLike, getCheckCondition, getCheckCondition, getColumnAliasExtractor, getCreateCatalogCommand, getCreateIndexString, getCreateIndexTail, getCreateMultisetTableString, getCreateSchemaCommand, getCreateTableString, getCreateTemporaryTableColumnAnnotation, getCreateUserDefinedTypeExtensionsString, getCreateUserDefinedTypeKindString, getDefaultLobLength, getDefaultProperties, getDefaultStatementBatchSize, getDefaultTimestampPrecision, getDisableConstraintsStatement, getDisableConstraintStatement, getDmlTargetColumnQualifierSupport, getDoublePrecision, getDropCatalogCommand, getDropForeignKeyString, getDropSchemaCommand, getDropTableString, getDropUniqueKeyString, getEnableConstraintsStatement, getEnableConstraintStatement, getEnumTypeDeclaration, getFallbackSchemaManagementTool, getFallbackSqmInsertStrategy, getFallbackSqmMutationStrategy, getFloatPrecision, getForeignKeyExporter, getForUpdateSkipLockedString, getForUpdateSkipLockedString, getForUpdateString, getForUpdateString, getForUpdateString, getGroupBySelectItemReferenceStrategy, getHqlTranslator, getIndexExporter, getInExpressionCountLimit, getKeywords, getLobMergeStrategy, getLockingStrategy, getLockRowIdentifier, getLowercaseFunction, getMaxNVarcharCapacity, getMaxVarbinaryCapacity, getMaxVarcharCapacity, getMinimumSupportedVersion, getMultiKeyLoadSizingStrategy, getNationalizationSupport, getNativeIdentifierGenerationType, getNativeIdentifierGeneratorStrategy, getNativeParameterMarkerStrategy, getNoColumnsInsertString, getNullColumnString, getNullColumnString, getParameterCountLimit, getPreferredSqlTypeCodeForArray, getPreferredSqlTypeCodeForBoolean, getQueryHintString, getReadRowLockStrategy, getResultSet, getResultSet, getResultSet, getRowIdColumnString, getSchemaNameResolver, getSelectClauseNullString, getSequenceExporter, getSizeStrategy, getSqmTranslatorFactory, getSupportedTemporaryTableKind, getTableCleaner, getTableMigrator, getTableTypeString, getTemporaryTableAfterUseAction, getTemporaryTableBeforeUseAction, getTemporaryTableCreateCommand, getTemporaryTableCreateOptions, getTemporaryTableDdlTransactionHandling, getTemporaryTableDropCommand, getTemporaryTableExporter, getTemporaryTableTruncateCommand, getTimeoutInSeconds, getTimeZoneSupport, getTruncateTableStatement, getTruncateTableStatements, getUniqueDelegate, getUniqueKeyExporter, getUserDefinedTypeComment, getUserDefinedTypeExporter, getVersion, getViolatedConstraintNameExtractor, hasAlterTable, hasDataTypeBeforeGeneratedAs, hasSelfReferentialForeignKeyBug, initDefaultProperties, inlineLiteral, isAnsiNullOn, isEmptyStringTreatedAsNull, isJdbcLogWarningsEnabledByDefault, isLob, isLockTimeoutParameterized, openQuote, ordinal, prependComment, qualifyIndexName, quote, registerKeyword, registerKeywords, requiresCastForConcatenatingNonStrings, requiresFloatCastingOfIntegerDivision, requiresParensForTupleCounts, requiresParensForTupleDistinctCounts, resolveSqlTypeCode, resolveSqlTypeCode, resolveSqlTypeDescriptor, resolveSqlTypeLength, rowId, rowIdSqlType, supportsAlterColumnType, supportsBindAsCallableArgument, supportsBitType, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsDistinctFromPredicate, supportsFetchClause, supportsIfExistsAfterAlterTable, supportsIfExistsAfterConstraintName, supportsIfExistsAfterTableName, supportsIfExistsAfterTypeName, supportsIfExistsBeforeConstraintName, supportsIfExistsBeforeTableName, supportsIfExistsBeforeTypeName, supportsInsertReturning, supportsInsertReturningGeneratedKeys, supportsLobValueChangePropagation, supportsLockTimeouts, supportsMaterializedLobAccess, supportsNamedParameters, supportsNonQueryWithCTE, supportsNullPrecedence, supportsOrdinalSelectItemReference, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPredicateAsExpression, supportsRecursiveCTE, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsSkipLocked, supportsStandardArrays, supportsStandardCurrentTimestampFunction, supportsSubqueryInSelect, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTemporalLiteralOffset, supportsTemporaryTablePrimaryKey, supportsTemporaryTables, supportsTruncateWithCast, supportsTupleCounts, supportsUnionAll, supportsUnionInSubquery, supportsValuesList, supportsWait, toBooleanValueString, toQuotedIdentifier, toString, transformSelectString, translateDurationField, translateExtractField, trimPattern, useArrayForMultiValuedParameters, useFollowOnLocking, useInputStreamToInsertBlob, useMaterializedLobWhenCapacityExceeded
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Constructor Detail
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AbstractHANADialect
public AbstractHANADialect(DatabaseVersion version)
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Method Detail
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columnType
protected String columnType(int sqlTypeCode)
Description copied from class:Dialect
The database column type name for a given JDBC type code defined inTypes
orSqlTypes
. This default implementation returns the ANSI-standard type name.This method may be overridden by concrete
Dialect
s as an alternative toDialect.registerColumnTypes(TypeContributions, ServiceRegistry)
for simple registrations.Note that:
- Implementations of this method are expected to define a
sensible mapping for
Types.NCLOB
Types.NCHAR
, andTypes.NVARCHAR
. On some database, these types are simply remapped toCLOB
,CHAR
, andVARCHAR
. - Mappings for
Types.TIMESTAMP
andTypes.TIMESTAMP_WITH_TIMEZONE
should support explicit specification of precision if possible. - As specified by
DdlTypeRegistry.getDescriptor(int)
, this method never receivesTypes.LONGVARCHAR
,Types.LONGNVARCHAR
, norTypes.LONGVARBINARY
, which are considered synonyms for their non-LONG
counterparts. - On the other hand, the types
SqlTypes.LONG32VARCHAR
,SqlTypes.LONG32NVARCHAR
, andSqlTypes.LONG32VARBINARY
are not synonyms, and implementations of this method must define sensible mappings, for example to database-nativeTEXT
orCLOB
types.
- Overrides:
columnType
in classDialect
- Parameters:
sqlTypeCode
- a SQLtype code
- Returns:
- a column type name, with
$l
,$p
,$s
placeholders for length, precision, scale - See Also:
SqlTypes
- Implementations of this method are expected to define a
sensible mapping for
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registerColumnTypes
protected void registerColumnTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)
Description copied from class:Dialect
Register ANSI-standard column types using the length limits defined byDialect.getMaxVarcharLength()
,Dialect.getMaxNVarcharLength()
, andDialect.getMaxVarbinaryLength()
.This method is always called when a
Dialect
is instantiated.- Overrides:
registerColumnTypes
in classDialect
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getDefaultNonContextualLobCreation
public boolean getDefaultNonContextualLobCreation()
Description copied from class:Dialect
The default value to use for the configuration property "hibernate.jdbc.lob.non_contextual_creation".- Overrides:
getDefaultNonContextualLobCreation
in classDialect
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getDefaultUseGetGeneratedKeys
public boolean getDefaultUseGetGeneratedKeys()
Description copied from class:Dialect
The default value to use for the configuration property "hibernate.jdbc.use_get_generated_keys".- Overrides:
getDefaultUseGetGeneratedKeys
in classDialect
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createVersion
protected static DatabaseVersion createVersion(DialectResolutionInfo info)
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castPattern
public String castPattern(CastType from, CastType to)
Description copied from class:Dialect
Obtain a pattern for the SQL equivalent to acast()
function call. The resulting pattern must contain ?1 and ?2 placeholders for the arguments.- Overrides:
castPattern
in classDialect
- Parameters:
from
- aCastType
indicating the type of the value argumentto
- aCastType
indicating the type the value argument is cast to
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getDefaultDecimalPrecision
public int getDefaultDecimalPrecision()
Description copied from class:Dialect
This is the default precision for a generated column mapped to aBigInteger
orBigDecimal
.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 classDialect
- Returns:
- the default precision, in decimal digits
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getMaxVarcharLength
public int getMaxVarcharLength()
Description copied from class:Dialect
The biggest size value that can be supplied as argument to aTypes.VARCHAR
-like type.For longer column lengths, use some sort of
text
-like type for the column.- Overrides:
getMaxVarcharLength
in classDialect
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getMaxNVarcharLength
public int getMaxNVarcharLength()
Description copied from class:Dialect
The biggest size value that can be supplied as argument to aTypes.NVARCHAR
-like type.For longer column lengths, use some sort of
ntext
-like type for the column.- Overrides:
getMaxNVarcharLength
in classDialect
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getMaxVarbinaryLength
public int getMaxVarbinaryLength()
Description copied from class:Dialect
The biggest size value that can be supplied as argument to aTypes.VARBINARY
-like type.For longer column lengths, use some sort of
image
-like type for the column.- Overrides:
getMaxVarbinaryLength
in classDialect
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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:
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avg(arg)
- aggregate function -
count([distinct ]arg)
- aggregate function -
max(arg)
- aggregate function -
min(arg)
- aggregate function -
sum(arg)
- aggregate function
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coalesce(arg0, arg1, ...)
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nullif(arg0, arg1)
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lower(arg)
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upper(arg)
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length(arg)
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concat(arg0, arg1, ...)
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locate(pattern, string[, start])
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substring(string, start[, length])
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trim([[spec ][character ]from] string)
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abs(arg)
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mod(arg0, arg1)
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sqrt(arg)
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current date
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current time
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current timestamp
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any(arg)
- aggregate function -
every(arg)
- aggregate function
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var_samp(arg)
- aggregate function -
var_pop(arg)
- aggregate function -
stddev_samp(arg)
- aggregate function -
stddev_pop(arg)
- aggregate function
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cast(arg as Type)
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extract(field from arg)
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ln(arg)
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exp(arg)
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power(arg0, arg1)
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floor(arg)
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ceiling(arg)
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position(pattern in string)
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substring(string from start[ for length])
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overlay(string placing replacement from start[ for length])
java.time
types:-
local date
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local time
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local datetime
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offset datetime
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instant
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left(string, length)
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right(string, length)
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replace(string, pattern, replacement)
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pad(string with length spec[ character])
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pi
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log10(arg)
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log(base, arg)
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sign(arg)
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sin(arg)
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cos(arg)
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tan(arg)
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asin(arg)
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acos(arg)
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atan(arg)
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atan2(arg0, arg1)
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round(arg0[, arg1])
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truncate(arg0[, arg1])
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sinh(arg)
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tanh(arg)
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cosh(arg)
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least(arg0, arg1, ...)
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greatest(arg0, arg1, ...)
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degrees(arg)
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radians(arg)
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format(datetime as pattern)
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collate(string as collation)
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str(arg)
- synonym ofcast(a as String)
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ifnull(arg0, arg1)
- synonym ofcoalesce(a, b)
extract()
, and desugared by the parser:-
second(arg)
- synonym ofextract(second from a)
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minute(arg)
- synonym ofextract(minute from a)
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hour(arg)
- synonym ofextract(hour from a)
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day(arg)
- synonym ofextract(day from a)
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month(arg)
- synonym ofextract(month from a)
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year(arg)
- synonym ofextract(year from a)
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 classDialect
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getSqlAstTranslatorFactory
public SqlAstTranslatorFactory getSqlAstTranslatorFactory()
Description copied from class:Dialect
- Overrides:
getSqlAstTranslatorFactory
in classDialect
- See Also:
StandardSqlAstTranslatorFactory
,JdbcEnvironment.getSqlAstTranslatorFactory()
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extractPattern
public String extractPattern(TemporalUnit unit)
HANA has no extract() function, but we can emulate it using the appropriate named functions instead of extract(). The supported fields areTemporalUnit.YEAR
,TemporalUnit.MONTH
TemporalUnit.DAY
,TemporalUnit.HOUR
,TemporalUnit.MINUTE
,TemporalUnit.SECOND
TemporalUnit.WEEK
,TemporalUnit.DAY_OF_WEEK
,TemporalUnit.DAY_OF_MONTH
,TemporalUnit.DAY_OF_YEAR
.- Overrides:
extractPattern
in classDialect
- Parameters:
unit
- the first argument
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buildSQLExceptionConversionDelegate
public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate()
Description copied from class:Dialect
An instance ofSQLExceptionConversionDelegate
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 returnedSQLExceptionConversionDelegate
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 classDialect
- Returns:
- The
SQLExceptionConversionDelegate
for this dialect
- a "static" delegate based on the JDBC4-defined
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getWriteRowLockStrategy
public RowLockStrategy getWriteRowLockStrategy()
Description copied from class:Dialect
The row lock strategy to use for write locks.- Overrides:
getWriteRowLockStrategy
in classDialect
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getAddColumnString
public String getAddColumnString()
Description copied from class:Dialect
The subcommand of thealter table
command used to add a column to a table, usuallyadd column
oradd
.- Overrides:
getAddColumnString
in classDialect
- Returns:
- The
add column
fragment.
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getAddColumnSuffixString
public String getAddColumnSuffixString()
Description copied from class:Dialect
The syntax for the suffix used to add a column to a table.- Overrides:
getAddColumnSuffixString
in classDialect
- Returns:
- The suffix of the
add column
fragment.
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getCascadeConstraintsString
public String getCascadeConstraintsString()
Description copied from class:Dialect
The keyword that specifies that adrop table
operation should be cascaded to its constraints, typically" cascade"
where the leading space is required, or the empty string if there is no such keyword in this dialect.- Overrides:
getCascadeConstraintsString
in classDialect
- Returns:
- The cascade drop keyword, if any, with a leading space
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getCurrentTimestampSelectString
public String getCurrentTimestampSelectString()
Description copied from class:Dialect
The command used to retrieve the current timestamp from the database.- Overrides:
getCurrentTimestampSelectString
in classDialect
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getForUpdateString
public String getForUpdateString(String aliases)
Description copied from class:Dialect
Get theFOR UPDATE OF column_list
fragment appropriate for this dialect, given the aliases of the columns to be write locked.- Overrides:
getForUpdateString
in classDialect
- Parameters:
aliases
- The columns to be write locked.- Returns:
- The appropriate
FOR UPDATE OF column_list
clause string.
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getForUpdateString
public String getForUpdateString(String aliases, LockOptions lockOptions)
Description copied from class:Dialect
Get theFOR UPDATE OF
orFOR SHARE OF
fragment appropriate for this dialect, given the aliases of the columns to be locked.- Overrides:
getForUpdateString
in classDialect
- Parameters:
aliases
- The columns to be locked.lockOptions
- the lock options to apply- Returns:
- The appropriate
FOR UPDATE OF column_list
clause string.
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getForUpdateNowaitString
public String getForUpdateNowaitString()
Description copied from class:Dialect
Retrieves theFOR UPDATE NOWAIT
syntax specific to this dialect.- Overrides:
getForUpdateNowaitString
in classDialect
- Returns:
- The appropriate
FOR UPDATE NOWAIT
clause string.
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getQuerySequencesString
public String getQuerySequencesString()
Description copied from class:Dialect
Get theselect
command used retrieve the names of all sequences.- Overrides:
getQuerySequencesString
in classDialect
- Returns:
- The select command; or null if sequences are not supported.
-
getSequenceInformationExtractor
public SequenceInformationExtractor getSequenceInformationExtractor()
Description copied from class:Dialect
ASequenceInformationExtractor
which is able to extractSequenceInformation
from the JDBC result set returned whenDialect.getQuerySequencesString()
is executed.- Overrides:
getSequenceInformationExtractor
in classDialect
-
isCurrentTimestampSelectStringCallable
public boolean isCurrentTimestampSelectStringCallable()
Description copied from class:Dialect
Is the command returned byDialect.getCurrentTimestampSelectString()
treated as callable?Typically, this indicates the use of the JDBC escape syntax.
- Overrides:
isCurrentTimestampSelectStringCallable
in classDialect
- Returns:
- if the
Dialect.getCurrentTimestampSelectString()
is treated as callable; false otherwise.
-
registerDefaultKeywords
protected void registerDefaultKeywords()
Description copied from class:Dialect
Register the reserved words of ANSI-standard SQL as keywords.- Overrides:
registerDefaultKeywords
in classDialect
- See Also:
AnsiSqlKeywords
-
defaultScrollMode
public ScrollMode defaultScrollMode()
Description copied from class:Dialect
A defaultScrollMode
to be used byQuery.scroll()
.- Overrides:
defaultScrollMode
in classDialect
- Returns:
- the default
ScrollMode
to use.
-
supportsColumnCheck
public boolean supportsColumnCheck()
HANA currently does not support check constraints.- Overrides:
supportsColumnCheck
in classDialect
- Returns:
- True if column-level
check
constraints are supported; false otherwise.
-
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 classDialect
- Returns:
- True if the current timestamp can be retrieved; false otherwise.
-
supportsExistsInSelect
public boolean supportsExistsInSelect()
Description copied from class:Dialect
Does the dialect support an exists statement in the select clause?- Overrides:
supportsExistsInSelect
in classDialect
- Returns:
- True if exists checks are allowed in the select clause; false otherwise.
-
supportsExpectedLobUsagePattern
public boolean supportsExpectedLobUsagePattern()
Description copied from class:Dialect
"Expected" LOB usage pattern is such that I can perform an insert via prepared statement with a parameter binding for a LOB value without crazy casting to JDBC driver implementation-specific classes.- Overrides:
supportsExpectedLobUsagePattern
in classDialect
- Returns:
- True if normal LOB usage patterns can be used with this driver; false if driver-specific hookiness needs to be applied.
-
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 classDialect
- Returns:
- True if unbounded materialization is supported; false otherwise.
-
getSequenceSupport
public SequenceSupport getSequenceSupport()
Description copied from class:Dialect
Get the appropriateSequenceSupport
for this dialect.- Overrides:
getSequenceSupport
in classDialect
-
supportsTableCheck
public boolean supportsTableCheck()
Description copied from class:Dialect
Does this dialect support table-level check constraints?- Overrides:
supportsTableCheck
in classDialect
- Returns:
- True if table-level
check
constraints are supported; false otherwise.
-
supportsTupleDistinctCounts
public boolean supportsTupleDistinctCounts()
Description copied from class:Dialect
Does this dialect supportcount(distinct a,b)
?- Overrides:
supportsTupleDistinctCounts
in classDialect
- Returns:
- True if the database supports counting distinct tuples; false otherwise.
-
dropConstraints
public boolean dropConstraints()
Description copied from class:Dialect
Do we need to drop constraints before dropping tables in this dialect?- Overrides:
dropConstraints
in classDialect
- Returns:
- True if constraints must be dropped prior to dropping the table; false otherwise.
-
getMaxAliasLength
public int getMaxAliasLength()
Description copied from class:Dialect
What is the maximum length Hibernate can use for generated aliases?- Overrides:
getMaxAliasLength
in classDialect
- Returns:
- The maximum length.
-
getMaxIdentifierLength
public int getMaxIdentifierLength()
Description copied from class:Dialect
What is the maximum identifier length supported by this dialect?- Overrides:
getMaxIdentifierLength
in classDialect
- Returns:
- The maximum length.
-
getLimitHandler
public LimitHandler getLimitHandler()
Description copied from class:Dialect
Obtain aLimitHandler
that implements pagination support forQuery.setMaxResults(int)
andQuery.setFirstResult(int)
.- Overrides:
getLimitHandler
in classDialect
-
getSelectGUIDString
public String getSelectGUIDString()
Description copied from class:Dialect
Get the command used to select a GUID from the database.Optional operation.
- Overrides:
getSelectGUIDString
in classDialect
- Returns:
- The appropriate command.
-
getNameQualifierSupport
public NameQualifierSupport getNameQualifierSupport()
Description copied from class:Dialect
The support for qualified identifiers.By default, decide based on
DatabaseMetaData
.- Overrides:
getNameQualifierSupport
in classDialect
- Returns:
- The
NameQualifierSupport
, or null to useDatabaseMetaData
.
-
buildIdentifierHelper
public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData) throws SQLException
Description copied from class:Dialect
TheIdentifierHelper
indicated by this dialect for handling identifier conversions. Returningnull
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 UPPERIdentifierHelperBuilder.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 classDialect
- Parameters:
builder
- A partially-configuredIdentifierHelperBuilder
.dbMetaData
- Access to the metadata returned from the driver if needed and if available. WARNING: it may benull
.- Returns:
- The
IdentifierHelper
instance to use, ornull
to indicate Hibernate should use its fallback path - Throws:
SQLException
- Accessing theDatabaseMetaData
can throw it. Just rethrow and Hibernate will handle it.- See Also:
Dialect.getNameQualifierSupport()
-
getCurrentSchemaCommand
public String getCurrentSchemaCommand()
Description copied from class:Dialect
Get the SQL command used to retrieve the current schema name.Works in conjunction with
Dialect.getSchemaNameResolver()
, unless the resultingSchemaNameResolver
does not need this information. For example, a custom implementation might make use of the Java 1.7Connection.getSchema()
method.- Overrides:
getCurrentSchemaCommand
in classDialect
- Returns:
- The current schema retrieval SQL
-
getForUpdateNowaitString
public String getForUpdateNowaitString(String aliases)
Description copied from class:Dialect
Get theFOR UPDATE OF column_list NOWAIT
fragment appropriate for this dialect, given the aliases of the columns to be write locked.- Overrides:
getForUpdateNowaitString
in classDialect
- Parameters:
aliases
- The columns to be write locked.- Returns:
- The appropriate
FOR UPDATE OF colunm_list NOWAIT
clause string.
-
getReadLockString
public String getReadLockString(int timeout)
Description copied from class:Dialect
Get the string to append toSELECT
statements to acquire READ locks for this dialect.Location of the returned string is treated the same as
Dialect.getForUpdateString()
.- Overrides:
getReadLockString
in classDialect
- Parameters:
timeout
- in milliseconds, -1 for indefinite wait and 0 for no wait.- Returns:
- The appropriate
LOCK
clause string.
-
getReadLockString
public String getReadLockString(String aliases, int timeout)
Description copied from class:Dialect
Get the string to append toSELECT
statements to acquire READ locks for this dialect, given the aliases of the columns to be read locked.Location of the returned string is treated the same as
Dialect.getForUpdateString()
.- Overrides:
getReadLockString
in classDialect
- Parameters:
aliases
- The columns to be read locked.timeout
- in milliseconds, -1 for indefinite wait and 0 for no wait.- Returns:
- The appropriate
LOCK
clause string.
-
getWriteLockString
public String getWriteLockString(int timeout)
Description copied from class:Dialect
Get the string to append toSELECT
statements to acquire pessimistic WRITE locks for this dialect.Location of the returned string is treated the same as
Dialect.getForUpdateString()
.- Overrides:
getWriteLockString
in classDialect
- Parameters:
timeout
- in milliseconds, -1 for indefinite wait and 0 for no wait.- Returns:
- The appropriate
LOCK
clause string.
-
getWriteLockString
public String getWriteLockString(String aliases, int timeout)
Description copied from class:Dialect
Get the string to append toSELECT
statements to acquire WRITE locks for this dialect, given the aliases of the columns to be write locked.Location of the returned string is treated the same as
Dialect.getForUpdateString()
.- Overrides:
getWriteLockString
in classDialect
- Parameters:
aliases
- The columns to be read locked.timeout
- in milliseconds, -1 for indefinite wait and 0 for no wait.- Returns:
- The appropriate
LOCK
clause string.
-
getQueryHintString
public String getQueryHintString(String query, List<String> hints)
Description copied from class:Dialect
Apply a hint to the given SQL query.The entire query is provided, allowing full control over the placement and syntax of the hint.
By default, ignore the hint and simply return the query.
- Overrides:
getQueryHintString
in classDialect
- Parameters:
query
- The query to which to apply the hint.hints
- The hints to apply- Returns:
- The modified SQL
-
getTableComment
public String getTableComment(String comment)
Description copied from class:Dialect
Get the comment into a form supported for table definition.- Overrides:
getTableComment
in classDialect
- Parameters:
comment
- The comment to apply- Returns:
- The comment fragment
-
getColumnComment
public String getColumnComment(String comment)
Description copied from class:Dialect
Get the comment into a form supported for column definition.- Overrides:
getColumnComment
in classDialect
- Parameters:
comment
- The comment to apply- Returns:
- The comment fragment
-
supportsCommentOn
public boolean supportsCommentOn()
Description copied from class:Dialect
Does this dialect support commenting on tables and columns?- Overrides:
supportsCommentOn
in classDialect
- Returns:
true
if commenting is supported
-
supportsPartitionBy
public boolean supportsPartitionBy()
Description copied from class:Dialect
Does is dialect supportpartition by
?- Overrides:
supportsPartitionBy
in classDialect
-
contributeTypes
public void contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)
Description copied from class:Dialect
A callback which allows theDialect
to contribute types.- Overrides:
contributeTypes
in classDialect
- Parameters:
typeContributions
- Callback to contribute the typesserviceRegistry
- The service registry
-
getBlobTypeDescriptor
public JdbcType getBlobTypeDescriptor()
-
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 givenSqlAppender
.- Overrides:
appendBooleanValueString
in classDialect
- Parameters:
appender
- TheSqlAppender
to append the literal expression tobool
- The boolean value
-
getIdentityColumnSupport
public IdentityColumnSupport getIdentityColumnSupport()
Description copied from class:Dialect
Get the appropriateIdentityColumnSupport
for this dialect.- Overrides:
getIdentityColumnSupport
in classDialect
- Returns:
- the IdentityColumnSupport
-
getTableExporter
public Exporter<Table> getTableExporter()
Description copied from class:Dialect
- Overrides:
getTableExporter
in classDialect
-
getCallableStatementSupport
public CallableStatementSupport getCallableStatementSupport()
Description copied from class:Dialect
TheCallableStatementSupport
for this database. Does this database support returning cursors?- Overrides:
getCallableStatementSupport
in classDialect
-
registerResultSetOutParameter
public int registerResultSetOutParameter(CallableStatement statement, int position) throws SQLException
Description copied from class:Dialect
Registers a parameter capable of returning aResultSet
by position, either anOUT
parameter, or aREF_CURSOR
parameter as defined in Java 8.- Overrides:
registerResultSetOutParameter
in classDialect
- Parameters:
statement
- The callable statement.position
- The bind position at which to register the output param.- Returns:
- The number of (contiguous) bind positions used.
- Throws:
SQLException
- Indicates problems registering the param.
-
registerResultSetOutParameter
public int registerResultSetOutParameter(CallableStatement statement, String name) throws SQLException
Description copied from class:Dialect
Registers a parameter capable of returning aResultSet
by name, either anOUT
parameter, or aREF_CURSOR
parameter as defined in Java 8.- Overrides:
registerResultSetOutParameter
in classDialect
- Parameters:
statement
- The callable statement.name
- The parameter name (for drivers which support named parameters).- Returns:
- The number of (contiguous) bind positions used.
- Throws:
SQLException
- Indicates problems registering the param.
-
supportsOffsetInSubquery
public boolean supportsOffsetInSubquery()
Description copied from class:Dialect
Does this dialect supportoffset
in subqueries?For example:
select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1 offset 1)
- Overrides:
supportsOffsetInSubquery
in classDialect
- Returns:
true
if it does
-
supportsWindowFunctions
public boolean supportsWindowFunctions()
Description copied from class:Dialect
Does this dialect support window functions likerow_number() over (..)
?- Overrides:
supportsWindowFunctions
in classDialect
- Returns:
true
if the underlying database supports window functions,false
otherwise. The default isfalse
.
-
supportsLateral
public boolean supportsLateral()
Description copied from class:Dialect
Does this dialect support the SQLlateral
keyword or a proprietary alternative?- Overrides:
supportsLateral
in classDialect
- Returns:
true
if the underlying database supports lateral,false
otherwise. The default isfalse
.
-
supportsNoWait
public boolean supportsNoWait()
Description copied from class:Dialect
Does this dialect supportNO_WAIT
timeout.- Overrides:
supportsNoWait
in classDialect
- Returns:
true
ifNO_WAIT
is supported
-
supportsJdbcConnectionLobCreation
public boolean supportsJdbcConnectionLobCreation(DatabaseMetaData databaseMetaData)
Description copied from class:Dialect
Check whether the JDBCConnection
supports creating LOBs viaConnection.createBlob()
,Connection.createNClob()
, orConnection.createClob()
.- Overrides:
supportsJdbcConnectionLobCreation
in classDialect
- Parameters:
databaseMetaData
- JDBCDatabaseMetaData
which can be used if LOB creation is supported only starting from a given driver version- Returns:
true
if LOBs can be created via the JDBC Connection.
-
supportsNoColumnsInsert
public boolean supportsNoColumnsInsert()
Description copied from class:Dialect
Is theINSERT
statement is allowed to contain no columns?- Overrides:
supportsNoColumnsInsert
in classDialect
- Returns:
- if this dialect supports no-column
INSERT
.
-
supportsValuesListForInsert
public boolean supportsValuesListForInsert()
Description copied from class:Dialect
Does this dialect supportvalues
lists of formVALUES (1), (2), (3)
in insert statements?- Overrides:
supportsValuesListForInsert
in classDialect
- Returns:
true
ifvalues
list are allowed in insert statements
-
supportsOrderByInSubquery
public boolean supportsOrderByInSubquery()
Description copied from class:Dialect
Does this dialect support theorder by
clause in subqueries?For example:
select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1)
- Overrides:
supportsOrderByInSubquery
in classDialect
- Returns:
true
if it does
-
getNullOrdering
public NullOrdering getNullOrdering()
Description copied from class:Dialect
Returns the default ordering of null.- Overrides:
getNullOrdering
in classDialect
-
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'sDateTimeFormatter
to whatever pattern language is understood by the native datetime formatting function for this database (often theto_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 classDialect
-
supportsFractionalTimestampArithmetic
public boolean supportsFractionalTimestampArithmetic()
Description copied from class:Dialect
Whether the database supports adding a fractional interval to a timestamp, for exampletimestamp + 0.5 second
.- Overrides:
supportsFractionalTimestampArithmetic
in classDialect
-
getFractionalSecondPrecisionInNanos
public long getFractionalSecondPrecisionInNanos()
Description copied from class:Dialect
The "native" precision for arithmetic with datetimes and day-to-second durations. Datetime differences will be calculated with this precision except when a precision is explicitly specified as aTemporalUnit
.Usually 1 (nanoseconds), 1_000 (microseconds), or 1_000_000 (milliseconds).
- Overrides:
getFractionalSecondPrecisionInNanos
in classDialect
- Returns:
- the precision, specified as a quantity of nanoseconds
- See Also:
TemporalUnit.NATIVE
-
timestampaddPattern
public String timestampaddPattern(TemporalUnit unit, TemporalType temporalType, IntervalType intervalType)
Description copied from class:Dialect
Obtain a pattern for the SQL equivalent to atimestampadd()
function call. The resulting pattern must contain ?1, ?2, and ?3 placeholders for the arguments.- Overrides:
timestampaddPattern
in classDialect
- Parameters:
unit
- The unit to add to the temporaltemporalType
- The type of the temporalintervalType
- 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 atimestampdiff()
function call. The resulting pattern must contain ?1, ?2, and ?3 placeholders for the arguments.- Overrides:
timestampdiffPattern
in classDialect
- Parameters:
unit
- the first argumentfromTemporalType
- true if the first argument is a timestamp, false if a datetoTemporalType
- true if the second argument is
-
appendDateTimeLiteral
public void appendDateTimeLiteral(SqlAppender appender, TemporalAccessor temporalAccessor, TemporalType precision, TimeZone jdbcTimeZone)
Description copied from class:Dialect
Append a datetime literal representing the givenjava.time
value to the givenSqlAppender
.- Overrides:
appendDateTimeLiteral
in classDialect
-
appendDateTimeLiteral
public void appendDateTimeLiteral(SqlAppender appender, Date date, TemporalType precision, TimeZone jdbcTimeZone)
Description copied from class:Dialect
Append a datetime literal representing the givenDate
value to the givenSqlAppender
.- Overrides:
appendDateTimeLiteral
in classDialect
-
generatedAs
public String generatedAs(String generatedAs)
Description copied from class:Dialect
Thegenerated as
clause, or similar, for generated column declarations in DDL statements.- Overrides:
generatedAs
in classDialect
- Parameters:
generatedAs
- a SQL expression used to generate the column value- Returns:
- The
generated as
clause containing the given expression
-
isUseUnicodeStringTypes
public boolean isUseUnicodeStringTypes()
-
supportsAsciiStringTypes
protected abstract boolean supportsAsciiStringTypes()
-
useUnicodeStringTypesDefault
protected abstract Boolean useUnicodeStringTypesDefault()
-
-