public class HSQLDialect extends Dialect
Note this version supports HSQLDB version 1.8 and higher, only.
Enhancements to version 3.5.0 GA to provide basic support for both HSQLDB 1.8.x and 2.x Does not works with Hibernate 3.2 - 3.4 without alteration.
CLOSED_QUOTE, DEFAULT_BATCH_SIZE, LEGACY_LOB_MERGE_STRATEGY, NEW_LOCATOR_LOB_MERGE_STRATEGY, NO_BATCH, QUOTE, STREAM_XFER_LOB_MERGE_STRATEGY
Constructor and Description |
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HSQLDialect()
Constructs a HSQLDialect
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Modifier and Type | Method and Description |
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boolean |
bindLimitParametersFirst()
Does the LIMIT clause come at the start of the
SELECT statement, rather than at the end?
|
boolean |
doesReadCommittedCauseWritersToBlockReaders()
For the underlying database, is READ_COMMITTED isolation implemented by
forcing readers to wait for write locks to be released?
|
boolean |
doesRepeatableReadCauseReadersToBlockWriters()
For the underlying database, is REPEATABLE_READ isolation implemented by
forcing writers to wait for read locks to be released?
|
boolean |
dropTemporaryTableAfterUse()
Do we need to drop the temporary table after use?
|
String |
generateTemporaryTableName(String baseTableName)
Generate a temporary table name given the base table.
|
String |
getAddColumnString()
The syntax used to add a column to a table (optional).
|
protected String |
getCreateSequenceString(String sequenceName)
HSQL will start with 0, by default.
|
protected String |
getCreateSequenceString(String sequenceName,
int initialValue,
int incrementSize)
Because of the overridden
getCreateSequenceString(String) , we must also override
getCreateSequenceString(String, int, int) to prevent 2 instances of "start with". |
String |
getCreateTemporaryTablePostfix()
Get any fragments needing to be postfixed to the command for
temporary table creation.
|
String |
getCreateTemporaryTableString()
Command used to create a temporary table.
|
String |
getCurrentTimestampSelectString()
Retrieve the command used to retrieve the current timestamp from the
database.
|
String |
getCurrentTimestampSQLFunctionName()
The name of the database-specific SQL function for retrieving the
current timestamp.
|
protected String |
getDropSequenceString(String sequenceName)
Typically dialects which support sequences can drop a sequence
with a single command.
|
String |
getDropTemporaryTableString()
Command used to drop a temporary table.
|
String |
getForUpdateString()
Get the string to append to SELECT statements to acquire locks
for this dialect.
|
String |
getIdentityColumnString()
The syntax used during DDL to define a column as being an IDENTITY.
|
String |
getIdentityInsertString()
The keyword used to insert a generated value into an identity column (or null).
|
String |
getIdentitySelectString()
Get the select command to use to retrieve the last generated IDENTITY
value.
|
String |
getLimitString(String sql,
boolean hasOffset)
Apply s limit clause to the query.
|
LockingStrategy |
getLockingStrategy(Lockable lockable,
LockMode lockMode)
For HSQLDB 2.0, this is a copy of the base class implementation.
|
String |
getQuerySequencesString()
Get the select command used retrieve the names of all sequences.
|
String |
getSelectClauseNullString(int sqlType)
Given a
Types type code, determine an appropriate
null value to use in a select clause. |
String |
getSelectSequenceNextValString(String sequenceName)
Generate the select expression fragment that will retrieve the next
value of a sequence as part of another (typically DML) statement.
|
String |
getSequenceNextValString(String sequenceName)
Generate the appropriate select statement to to retrieve the next value
of a sequence.
|
ViolatedConstraintNameExtracter |
getViolatedConstraintNameExtracter() |
boolean |
isCurrentTimestampSelectStringCallable()
Should the value returned by
Dialect.getCurrentTimestampSelectString()
be treated as callable. |
Boolean |
performTemporaryTableDDLInIsolation()
Does the dialect require that temporary table DDL statements occur in
isolation from other statements? This would be the case if the creation
would cause any current transaction to get committed implicitly.
|
boolean |
requiresCastingOfParametersInSelectClause()
Does this dialect require that parameters appearing in the SELECT clause be wrapped in cast()
calls to tell the db parser the expected type.
|
boolean |
supportsColumnCheck()
Does this dialect support column-level check constraints?
|
boolean |
supportsCommentOn()
Does this dialect/database support commenting on tables, columns, etc?
|
boolean |
supportsCurrentTimestampSelection()
HSQLDB 1.8.x requires CALL CURRENT_TIMESTAMP but this should not
be treated as a callable statement.
|
boolean |
supportsEmptyInList()
Does this dialect support empty IN lists?
For example, is [where XYZ in ()] a supported construct? |
boolean |
supportsIdentityColumns()
Does this dialect support identity column key generation?
|
boolean |
supportsIfExistsAfterTableName()
For dropping a table, can the phrase "if exists" be applied after the table name?
NOTE : Only one or the other (or neither) of this and |
boolean |
supportsLimit()
Does this dialect support some form of limiting query results
via a SQL clause?
|
boolean |
supportsLobValueChangePropogation()
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()
Informational metadata about whether this dialect is known to support
specifying timeouts for requested lock acquisitions.
|
boolean |
supportsPooledSequences()
Does this dialect support "pooled" sequences.
|
boolean |
supportsSequences()
Does this dialect support sequences?
|
boolean |
supportsTemporaryTables()
Does this dialect support temporary tables?
|
boolean |
supportsTupleDistinctCounts()
Does this dialect support `count(distinct a,b)`?
|
boolean |
supportsUnionAll()
Does this dialect support UNION ALL, which is generally a faster
variant of UNION?
|
String |
toBooleanValueString(boolean bool)
The SQL literal value to which this database maps boolean values.
|
appendIdentitySelectToInsert, appendLockHint, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersInReverseOrder, buildLimitHandler, buildSQLExceptionConversionDelegate, buildSQLExceptionConverter, cast, cast, cast, closeQuote, contributeTypes, convertToFirstRowValue, createCaseFragment, createOuterJoinFragment, defaultScrollMode, dropConstraints, forceLimitUsage, forceLobAsLastValue, forUpdateOfColumns, getAddColumnSuffixString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAddUniqueConstraintString, getCallableStatementSupport, getCascadeConstraintsString, getCaseInsensitiveLike, getCastTypeName, getColumnAliasExtractor, getColumnComment, getCreateMultisetTableString, getCreateSchemaCommand, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCrossJoinSeparator, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSchemaCommand, getDropSequenceStrings, getDropTableString, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateSkipLockedString, getForUpdateSkipLockedString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentitySelectString, getInExpressionCountLimit, getKeywords, getLimitString, getLobMergeStrategy, getLowercaseFunction, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getNotExpression, getNullColumnString, getQueryHintString, getReadLockString, getResultSet, getResultSet, getResultSet, getSelectGUIDString, getSqlTypeDescriptorOverride, getTableComment, getTableTypeString, getTypeName, getTypeName, getUniqueDelegate, getWriteLockString, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, isLockTimeoutParameterized, openQuote, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, registerResultSetOutParameter, remapSqlTypeDescriptor, renderOrderByElement, replaceResultVariableInOrderByClauseWithPosition, requiresParensForTupleDistinctCounts, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsIfExistsAfterConstraintName, supportsIfExistsBeforeConstraintName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLimitOffset, supportsNotNullUnique, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTupleCounts, supportsTuplesInSubqueries, supportsUnboundedLobLocatorMaterialization, supportsUnique, supportsUniqueConstraintInCreateAlterTable, supportsVariableLimit, toString, transformSelectString, useFollowOnLocking, useInputStreamToInsertBlob, useMaxForLimit
public String getAddColumnString()
Dialect
getAddColumnString
in class Dialect
public boolean supportsIdentityColumns()
Dialect
supportsIdentityColumns
in class Dialect
public String getIdentityColumnString()
Dialect
getIdentityColumnString
in class Dialect
public String getIdentitySelectString()
Dialect
getIdentitySelectString
in class Dialect
public String getIdentityInsertString()
Dialect
getIdentityInsertString
in class Dialect
public boolean supportsLockTimeouts()
Dialect
supportsLockTimeouts
in class Dialect
public String getForUpdateString()
Dialect
getForUpdateString
in class Dialect
public boolean supportsLimit()
Dialect
supportsLimit
in class Dialect
public String getLimitString(String sql, boolean hasOffset)
Dialect
Typically dialects utilize variable
limit clauses when they support limits. Thus, when building the
select command we do not actually need to know the limit or the offest
since we will just be using placeholders.
Here we do still pass along whether or not an offset was specified
so that dialects not supporting offsets can generate proper exceptions.
In general, dialects will override one or the other of this method and
Dialect.getLimitString(String, int, int)
.
getLimitString
in class Dialect
sql
- The query to which to apply the limit.hasOffset
- Is the query requesting an offset?public boolean bindLimitParametersFirst()
Dialect
bindLimitParametersFirst
in class Dialect
public boolean supportsIfExistsAfterTableName()
Dialect
NOTE : Only one or the other (or neither) of this and Dialect.supportsIfExistsBeforeTableName()
should return true
supportsIfExistsAfterTableName
in class Dialect
true
if the "if exists" can be applied after the table namepublic boolean supportsColumnCheck()
Dialect
supportsColumnCheck
in class Dialect
public boolean supportsSequences()
Dialect
supportsSequences
in class Dialect
public boolean supportsPooledSequences()
Dialect
supportsPooledSequences
in class Dialect
Dialect.getCreateSequenceStrings(String, int, int)
,
Dialect.getCreateSequenceString(String, int, int)
protected String getCreateSequenceString(String sequenceName)
getCreateSequenceString
in class Dialect
sequenceName
- The name of the sequenceprotected String getCreateSequenceString(String sequenceName, int initialValue, int incrementSize) throws MappingException
getCreateSequenceString(String)
, we must also override
getCreateSequenceString(String, int, int)
to prevent 2 instances of "start with".getCreateSequenceString
in class Dialect
sequenceName
- The name of the sequenceinitialValue
- The initial value to apply to 'create sequence' statementincrementSize
- The increment value to apply to 'create sequence' statementMappingException
- If sequences are not supported.protected String getDropSequenceString(String sequenceName)
Dialect
Dialect.getDropSequenceStrings(java.lang.String)
to help facilitate that.
Dialects which support sequences and can drop a sequence in a
single command need *only* override this method. Dialects
which support sequences but require multiple commands to drop
a sequence should instead override Dialect.getDropSequenceStrings(java.lang.String)
.
getDropSequenceString
in class Dialect
sequenceName
- The name of the sequencepublic String getSelectSequenceNextValString(String sequenceName)
Dialect
This differs from Dialect.getSequenceNextValString(String)
in that this
should return an expression usable within another statement.
getSelectSequenceNextValString
in class Dialect
sequenceName
- the name of the sequencepublic String getSequenceNextValString(String sequenceName)
Dialect
This should be a "stand alone" select statement.
getSequenceNextValString
in class Dialect
sequenceName
- the name of the sequencepublic String getQuerySequencesString()
Dialect
getQuerySequencesString
in class Dialect
SchemaUpdate
public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter()
getViolatedConstraintNameExtracter
in interface ConversionContext
getViolatedConstraintNameExtracter
in class Dialect
public String getSelectClauseNullString(int sqlType)
Dialect
Types
type code, determine an appropriate
null value to use in a select clause.
One thing to consider here is that certain databases might require proper casting for the nulls here since the select here will be part of a UNION/UNION ALL.
getSelectClauseNullString
in class Dialect
sqlType
- The Types
type code.public boolean supportsUnionAll()
Dialect
supportsUnionAll
in class Dialect
public boolean supportsTemporaryTables()
Dialect
supportsTemporaryTables
in class Dialect
public String generateTemporaryTableName(String baseTableName)
Dialect
generateTemporaryTableName
in class Dialect
baseTableName
- The table name from which to base the temp table name.public String getCreateTemporaryTableString()
Dialect
getCreateTemporaryTableString
in class Dialect
public String getCreateTemporaryTablePostfix()
Dialect
getCreateTemporaryTablePostfix
in class Dialect
public String getDropTemporaryTableString()
Dialect
getDropTemporaryTableString
in class Dialect
public Boolean performTemporaryTableDDLInIsolation()
Dialect
JDBC defines a standard way to query for this information via the
DatabaseMetaData.dataDefinitionCausesTransactionCommit()
method. However, that does not distinguish between temporary table
DDL and other forms of DDL; MySQL, for example, reports DDL causing a
transaction commit via its driver, even though that is not the case for
temporary table DDL.
Possible return values and their meanings:
Boolean.TRUE
- Unequivocally, perform the temporary table DDL
in isolation.Boolean.FALSE
- Unequivocally, do not perform the
temporary table DDL in isolation.DatabaseMetaData.dataDefinitionCausesTransactionCommit()
performTemporaryTableDDLInIsolation
in class Dialect
public boolean dropTemporaryTableAfterUse()
Dialect
dropTemporaryTableAfterUse
in class Dialect
public boolean supportsCurrentTimestampSelection()
Does this dialect support a way to retrieve the database's current timestamp value?
supportsCurrentTimestampSelection
in class Dialect
public boolean isCurrentTimestampSelectStringCallable()
Dialect
Dialect.getCurrentTimestampSelectString()
be treated as callable. Typically this indicates that JDBC escape
syntax is being used...isCurrentTimestampSelectStringCallable
in class Dialect
Dialect.getCurrentTimestampSelectString()
return
is callable; false otherwise.public String getCurrentTimestampSelectString()
Dialect
getCurrentTimestampSelectString
in class Dialect
public String getCurrentTimestampSQLFunctionName()
Dialect
getCurrentTimestampSQLFunctionName
in class Dialect
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode)
Get a strategy instance which knows how to acquire a database-level lock of the specified mode for this dialect.
getLockingStrategy
in class Dialect
lockable
- The persister for the entity to be locked.lockMode
- The type of lock to be acquired.public boolean supportsCommentOn()
Dialect
supportsCommentOn
in class Dialect
true
if commenting is supportedpublic boolean supportsEmptyInList()
Dialect
For example, is [where XYZ in ()] a supported construct?
supportsEmptyInList
in class Dialect
public boolean requiresCastingOfParametersInSelectClause()
Dialect
requiresCastingOfParametersInSelectClause
in class Dialect
public boolean doesReadCommittedCauseWritersToBlockReaders()
Dialect
doesReadCommittedCauseWritersToBlockReaders
in class Dialect
public boolean doesRepeatableReadCauseReadersToBlockWriters()
Dialect
doesRepeatableReadCauseReadersToBlockWriters
in class Dialect
public boolean supportsLobValueChangePropogation()
Dialect
For BLOBs, the internal value might be changed by:
Blob.setBinaryStream(long)
,
Blob.setBytes(long, byte[])
,
Blob.setBytes(long, byte[], int, int)
,
or Blob.truncate(long)
.
For CLOBs, the internal value might be changed by:
Clob.setAsciiStream(long)
,
Clob.setCharacterStream(long)
,
Clob.setString(long, String)
,
Clob.setString(long, String, int, int)
,
or Clob.truncate(long)
.
NOTE : I do not know the correct answer currently for
databases which (1) are not part of the cruise control process
or (2) do not Dialect.supportsExpectedLobUsagePattern()
.
supportsLobValueChangePropogation
in class Dialect
public String toBooleanValueString(boolean bool)
Dialect
toBooleanValueString
in class Dialect
bool
- The boolean valuepublic boolean supportsTupleDistinctCounts()
Dialect
supportsTupleDistinctCounts
in class Dialect
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