org.hibernate.dialect
Class InformixDialect

java.lang.Object
  extended by org.hibernate.dialect.Dialect
      extended by org.hibernate.dialect.InformixDialect
All Implemented Interfaces:
ConversionContext

public class InformixDialect
extends Dialect

Informix dialect.

Seems to work with Informix Dynamic Server Version 7.31.UD3, Informix JDBC driver version 2.21JC3.


Field Summary
 
Fields inherited from class org.hibernate.dialect.Dialect
CLOSED_QUOTE, DEFAULT_BATCH_SIZE, LEGACY_LOB_MERGE_STRATEGY, NEW_LOCATOR_LOB_MERGE_STRATEGY, NO_BATCH, QUOTE, STREAM_XFER_LOB_MERGE_STRATEGY
 
Constructor Summary
InformixDialect()
          Creates new InformixDialect instance.
 
Method Summary
 String getAddColumnString()
          The syntax used to add a column to a table (optional).
 String getAddForeignKeyConstraintString(String constraintName, String[] foreignKey, String referencedTable, String[] primaryKey, boolean referencesPrimaryKey)
          The syntax used to add a foreign key constraint to a table.
 String getAddPrimaryKeyConstraintString(String constraintName)
          The syntax used to add a primary key constraint to a table.
 String getCreateSequenceString(String sequenceName)
          Typically dialects which support sequences can create a sequence with a single command.
 String getCreateTemporaryTablePostfix()
          Overrides Dialect.getCreateTemporaryTablePostfix() to return "with no log" when invoked.
 String getCreateTemporaryTableString()
          Overrides Dialect.getCreateTemporaryTableString() to return "create temp table" when invoked.
 String getCurrentTimestampSelectString()
          Retrieve the command used to retrieve the current timestamp from the database.
 String getDropSequenceString(String sequenceName)
          Typically dialects which support sequences can drop a sequence with a single command.
 String getIdentityColumnString(int type)
          The syntax used during DDL to define a column as being an IDENTITY of a particular type.
 String getIdentitySelectString(String table, String column, int type)
          Get the select command to use to retrieve the last generated IDENTITY value for a particular table
 String getLimitString(String querySelect, int offset, int limit)
          Given a limit and an offset, apply the limit clause to the query.
 String getQuerySequencesString()
          Get the select command used retrieve the names of all sequences.
 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 hasDataTypeInIdentityColumn()
          Whether this dialect have an Identity clause added to the data type or a completely separate identity data type
 boolean isCurrentTimestampSelectStringCallable()
          Should the value returned by Dialect.getCurrentTimestampSelectString() be treated as callable.
 boolean supportsCurrentTimestampSelection()
          Does this dialect support a way to retrieve the database's current timestamp value?
 boolean supportsIdentityColumns()
          Does this dialect support identity column key generation?
 boolean supportsLimit()
          Does this dialect support some form of limiting query results via a SQL clause?
 boolean supportsLimitOffset()
          Does this dialect's LIMIT support (if any) additionally support specifying an offset?
 boolean supportsPooledSequences()
          Does this dialect support "pooled" sequences.
 boolean supportsSequences()
          Does this dialect support sequences?
 boolean supportsTemporaryTables()
          Overrides Dialect.supportsTemporaryTables() to return true when invoked.
 boolean supportsVariableLimit()
          Does this dialect support bind variables (i.e., prepared statement parameters) for its limit/offset?
 boolean useMaxForLimit()
          Does the LIMIT clause take a "maximum" row number instead of a total number of returned rows?

This is easiest understood via an example.

 
Methods inherited from class org.hibernate.dialect.Dialect
appendIdentitySelectToInsert, appendLockHint, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildLimitHandler, buildSQLExceptionConversionDelegate, buildSQLExceptionConverter, cast, cast, cast, closeQuote, convertToFirstRowValue, createCaseFragment, createOuterJoinFragment, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, dropConstraints, dropTemporaryTableAfterUse, forceLimitUsage, forceLobAsLastValue, forUpdateOfColumns, generateTemporaryTableName, getAddUniqueConstraintString, getCascadeConstraintsString, getCaseInsensitiveLike, getCastTypeName, getColumnAliasExtractor, getColumnComment, getCreateMultisetTableString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCrossJoinSeparator, getCurrentTimestampSQLFunctionName, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceStrings, getDropTableString, getDropTemporaryTableString, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentityInsertString, getIdentitySelectString, getInExpressionCountLimit, getKeywords, getLimitString, getLobMergeStrategy, getLockingStrategy, getLowercaseFunction, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getNotExpression, getNullColumnString, getReadLockString, getResultSet, getSelectClauseNullString, getSelectGUIDString, getSqlTypeDescriptorOverride, getTableComment, getTableTypeString, getTypeName, getTypeName, getWriteLockString, hasAlterTable, hasSelfReferentialForeignKeyBug, isLockTimeoutParameterized, openQuote, performTemporaryTableDDLInIsolation, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, registerResultSetOutParameter, remapSqlTypeDescriptor, replaceResultVariableInOrderByClauseWithPosition, requiresCastingOfParametersInSelectClause, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsCommentOn, supportsEmptyInList, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLobValueChangePropogation, supportsLockTimeouts, supportsNotNullUnique, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTupleCounts, supportsTupleDistinctCounts, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, supportsUnique, supportsUniqueConstraintInCreateAlterTable, toBooleanValueString, toString, transformSelectString, useFollowOnLocking, useInputStreamToInsertBlob
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

InformixDialect

public InformixDialect()
Creates new InformixDialect instance. Sets up the JDBC / Informix type mappings.

Method Detail

getAddColumnString

public String getAddColumnString()
Description copied from class: Dialect
The syntax used to add a column to a table (optional).

Overrides:
getAddColumnString in class Dialect
Returns:
The "add column" fragment.

supportsIdentityColumns

public boolean supportsIdentityColumns()
Description copied from class: Dialect
Does this dialect support identity column key generation?

Overrides:
supportsIdentityColumns in class Dialect
Returns:
True if IDENTITY columns are supported; false otherwise.

getIdentitySelectString

public String getIdentitySelectString(String table,
                                      String column,
                                      int type)
                               throws MappingException
Description copied from class: Dialect
Get the select command to use to retrieve the last generated IDENTITY value for a particular table

Overrides:
getIdentitySelectString in class Dialect
Parameters:
table - The table into which the insert was done
column - The PK column.
type - The Types type code.
Returns:
The appropriate select command
Throws:
MappingException - If IDENTITY generation is not supported.

getIdentityColumnString

public String getIdentityColumnString(int type)
                               throws MappingException
Description copied from class: Dialect
The syntax used during DDL to define a column as being an IDENTITY of a particular type.

Overrides:
getIdentityColumnString in class Dialect
Parameters:
type - The Types type code.
Returns:
The appropriate DDL fragment.
Throws:
MappingException - If IDENTITY generation is not supported.

hasDataTypeInIdentityColumn

public boolean hasDataTypeInIdentityColumn()
Description copied from class: Dialect
Whether this dialect have an Identity clause added to the data type or a completely separate identity data type

Overrides:
hasDataTypeInIdentityColumn in class Dialect
Returns:
boolean

getAddForeignKeyConstraintString

public String getAddForeignKeyConstraintString(String constraintName,
                                               String[] foreignKey,
                                               String referencedTable,
                                               String[] primaryKey,
                                               boolean referencesPrimaryKey)
The syntax used to add a foreign key constraint to a table. Informix constraint name must be at the end.

Overrides:
getAddForeignKeyConstraintString in class Dialect
Parameters:
constraintName - The FK constraint name.
foreignKey - The names of the columns comprising the FK
referencedTable - The table referenced by the FK
primaryKey - The explicit columns in the referencedTable referenced by this FK.
referencesPrimaryKey - if false, constraint should be explicit about which column names the constraint refers to
Returns:
String

getAddPrimaryKeyConstraintString

public String getAddPrimaryKeyConstraintString(String constraintName)
The syntax used to add a primary key constraint to a table. Informix constraint name must be at the end.

Overrides:
getAddPrimaryKeyConstraintString in class Dialect
Parameters:
constraintName - The name of the PK constraint.
Returns:
String

getCreateSequenceString

public String getCreateSequenceString(String sequenceName)
Description copied from class: Dialect
Typically dialects which support sequences can create a sequence with a single command. This is convenience form of Dialect.getCreateSequenceStrings(java.lang.String) to help facilitate that.

Dialects which support sequences and can create a sequence in a single command need *only* override this method. Dialects which support sequences but require multiple commands to create a sequence should instead override Dialect.getCreateSequenceStrings(java.lang.String).

Overrides:
getCreateSequenceString in class Dialect
Parameters:
sequenceName - The name of the sequence
Returns:
The sequence creation command

getDropSequenceString

public String getDropSequenceString(String sequenceName)
Description copied from class: Dialect
Typically dialects which support sequences can drop a sequence with a single command. This is convenience form of Dialect.getDropSequenceStrings(java.lang.String) to help facilitate that.

Dialects which support sequences and can drop a sequence in a single command need *only* override this method. Dialects which support sequences but require multiple commands to drop a sequence should instead override Dialect.getDropSequenceStrings(java.lang.String).

Overrides:
getDropSequenceString in class Dialect
Parameters:
sequenceName - The name of the sequence
Returns:
The sequence drop commands

getSequenceNextValString

public String getSequenceNextValString(String sequenceName)
Description copied from class: Dialect
Generate the appropriate select statement to to retrieve the next value of a sequence.

This should be a "stand alone" select statement.

Overrides:
getSequenceNextValString in class Dialect
Parameters:
sequenceName - the name of the sequence
Returns:
String The "nextval" select string.

getSelectSequenceNextValString

public String getSelectSequenceNextValString(String sequenceName)
Description copied from class: Dialect
Generate the select expression fragment that will retrieve the next value of a sequence as part of another (typically DML) statement.

This differs from Dialect.getSequenceNextValString(String) in that this should return an expression usable within another statement.

Overrides:
getSelectSequenceNextValString in class Dialect
Parameters:
sequenceName - the name of the sequence
Returns:
The "nextval" fragment.

supportsSequences

public boolean supportsSequences()
Description copied from class: Dialect
Does this dialect support sequences?

Overrides:
supportsSequences in class Dialect
Returns:
True if sequences supported; false otherwise.

supportsPooledSequences

public boolean supportsPooledSequences()
Description copied from class: Dialect
Does this dialect support "pooled" sequences. Not aware of a better name for this. Essentially can we specify the initial and increment values?

Overrides:
supportsPooledSequences in class Dialect
Returns:
True if such "pooled" sequences are supported; false otherwise.
See Also:
Dialect.getCreateSequenceStrings(String, int, int), Dialect.getCreateSequenceString(String, int, int)

getQuerySequencesString

public String getQuerySequencesString()
Description copied from class: Dialect
Get the select command used retrieve the names of all sequences.

Overrides:
getQuerySequencesString in class Dialect
Returns:
The select command; or null if sequences are not supported.
See Also:
SchemaUpdate

supportsLimit

public boolean supportsLimit()
Description copied from class: Dialect
Does this dialect support some form of limiting query results via a SQL clause?

Overrides:
supportsLimit in class Dialect
Returns:
True if this dialect supports some form of LIMIT.

useMaxForLimit

public boolean useMaxForLimit()
Description copied from class: Dialect
Does the LIMIT clause take a "maximum" row number instead of a total number of returned rows?

This is easiest understood via an example. Consider you have a table with 20 rows, but you only want to retrieve rows number 11 through 20. Generally, a limit with offset would say that the offset = 11 and the limit = 10 (we only want 10 rows at a time); this is specifying the total number of returned rows. Some dialects require that we instead specify offset = 11 and limit = 20, where 20 is the "last" row we want relative to offset (i.e. total number of rows = 20 - 11 = 9)

So essentially, is limit relative from offset? Or is limit absolute?

Overrides:
useMaxForLimit in class Dialect
Returns:
True if limit is relative from offset; false otherwise.

supportsLimitOffset

public boolean supportsLimitOffset()
Description copied from class: Dialect
Does this dialect's LIMIT support (if any) additionally support specifying an offset?

Overrides:
supportsLimitOffset in class Dialect
Returns:
True if the dialect supports an offset within the limit support.

getLimitString

public String getLimitString(String querySelect,
                             int offset,
                             int limit)
Description copied from class: Dialect
Given a limit and an offset, apply the limit clause to the query.

Overrides:
getLimitString in class Dialect
Parameters:
querySelect - The query to which to apply the limit.
offset - The offset of the limit
limit - The limit of the limit ;)
Returns:
The modified query statement with the limit applied.

supportsVariableLimit

public boolean supportsVariableLimit()
Description copied from class: Dialect
Does this dialect support bind variables (i.e., prepared statement parameters) for its limit/offset?

Overrides:
supportsVariableLimit in class Dialect
Returns:
True if bind variables can be used; false otherwise.

getViolatedConstraintNameExtracter

public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter()
Specified by:
getViolatedConstraintNameExtracter in interface ConversionContext
Overrides:
getViolatedConstraintNameExtracter in class Dialect

supportsCurrentTimestampSelection

public boolean supportsCurrentTimestampSelection()
Description copied from class: Dialect
Does this dialect support a way to retrieve the database's current timestamp value?

Overrides:
supportsCurrentTimestampSelection in class Dialect
Returns:
True if the current timestamp can be retrieved; false otherwise.

isCurrentTimestampSelectStringCallable

public boolean isCurrentTimestampSelectStringCallable()
Description copied from class: Dialect
Should the value returned by Dialect.getCurrentTimestampSelectString() be treated as callable. Typically this indicates that JDBC escape syntax is being used...

Overrides:
isCurrentTimestampSelectStringCallable in class Dialect
Returns:
True if the Dialect.getCurrentTimestampSelectString() return is callable; false otherwise.

getCurrentTimestampSelectString

public String getCurrentTimestampSelectString()
Description copied from class: Dialect
Retrieve the command used to retrieve the current timestamp from the database.

Overrides:
getCurrentTimestampSelectString in class Dialect
Returns:
The command.

supportsTemporaryTables

public boolean supportsTemporaryTables()
Overrides Dialect.supportsTemporaryTables() to return true when invoked.

Overrides:
supportsTemporaryTables in class Dialect
Returns:
true when invoked

getCreateTemporaryTableString

public String getCreateTemporaryTableString()
Overrides Dialect.getCreateTemporaryTableString() to return "create temp table" when invoked.

Overrides:
getCreateTemporaryTableString in class Dialect
Returns:
"create temp table" when invoked

getCreateTemporaryTablePostfix

public String getCreateTemporaryTablePostfix()
Overrides Dialect.getCreateTemporaryTablePostfix() to return "with no log" when invoked.

Overrides:
getCreateTemporaryTablePostfix in class Dialect
Returns:
"with no log" when invoked


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