DB2390Dialect (Hibernate JavaDocs)
Date: 2012-04-05

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## org.hibernate.dialect
Class DB2390Dialect

    java.lang.Object
      org.hibernate.dialect.Dialect
          org.hibernate.dialect.DB2Dialect
              org.hibernate.dialect.DB2390Dialect

All Implemented Interfaces:
  ConversionContext

    public class DB2390Dialect

extends DB2Dialect

An SQL dialect for DB2/390. This class provides support for DB2 Universal Database for OS/390, also known as DB2/390.

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
`DB2390Dialect()`

Method Summary
`String` | `getIdentitySelectString()` Get the select command to use to retrieve the last generated IDENTITY value.
`String` | `getLimitString(String sql, int offset, int limit)` Given a limit and an offset, apply the limit clause to the query.
`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` | `supportsSequences()` Does this dialect support sequences?
`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.DB2Dialect
`convertToFirstRowValue, doesReadCommittedCauseWritersToBlockReaders, dropConstraints, generateTemporaryTableName, getAddColumnString, getCreateSequenceString, getCreateTemporaryTablePostfix, getCreateTemporaryTableString, getCrossJoinSeparator, getCurrentTimestampSelectString, getDropSequenceString, getForUpdateString, getIdentityColumnString, getIdentityInsertString, getLowercaseFunction, getQuerySequencesString, getResultSet, getSelectClauseNullString, getSequenceNextValString, isCurrentTimestampSelectStringCallable, main, registerResultSetOutParameter, requiresCastingOfParametersInSelectClause, supportsCommentOn, supportsCurrentTimestampSelection, supportsEmptyInList, supportsExistsInSelect, supportsIdentityColumns, supportsLobValueChangePropogation, supportsNotNullUnique, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPooledSequences, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsTemporaryTables, supportsTupleDistinctCounts, supportsUnionAll`

Methods inherited from class org.hibernate.dialect.Dialect
`appendIdentitySelectToInsert, appendLockHint, applyLocksToSql, areStringComparisonsCaseInsensitive, bindLimitParametersFirst, bindLimitParametersInReverseOrder, buildSQLExceptionConversionDelegate, buildSQLExceptionConverter, closeQuote, createCaseFragment, createOuterJoinFragment, doesRepeatableReadCauseReadersToBlockWriters, dropTemporaryTableAfterUse, forceLimitUsage, forUpdateOfColumns, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAddUniqueConstraintString, getCascadeConstraintsString, getCaseInsensitiveLike, getCastTypeName, getColumnAliasExtractor, getColumnComment, getCreateMultisetTableString, getCreateSequenceString, getCreateSequenceStrings, getCreateSequenceStrings, getCreateTableString, getCurrentTimestampSQLFunctionName, getDefaultProperties, getDialect, getDialect, getDropForeignKeyString, getDropSequenceStrings, getDropTemporaryTableString, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFunctions, getHibernateTypeName, getHibernateTypeName, getIdentityColumnString, getIdentitySelectString, getKeywords, getLimitString, getLobMergeStrategy, getLockingStrategy, getMaxAliasLength, getNativeIdentifierGeneratorClass, getNoColumnsInsertString, getNullColumnString, getReadLockString, getSelectGUIDString, getSelectSequenceNextValString, getSqlTypeDescriptorOverride, getTableComment, getTableTypeString, getTypeName, getTypeName, getViolatedConstraintNameExtracter, getWriteLockString, hasAlterTable, hasDataTypeInIdentityColumn, hasSelfReferentialForeignKeyBug, isLockTimeoutParameterized, openQuote, performTemporaryTableDDLInIsolation, qualifyIndexName, quote, registerColumnType, registerColumnType, registerFunction, registerHibernateType, registerHibernateType, registerKeyword, remapSqlTypeDescriptor, replaceResultVariableInOrderByClauseWithPosition, supportsBindAsCallableArgument, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsExpectedLobUsagePattern, supportsIfExistsAfterTableName, supportsIfExistsBeforeTableName, supportsInsertSelectIdentity, supportsLockTimeouts, supportsRowValueConstructorSyntax, supportsRowValueConstructorSyntaxInInList, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTupleCounts, supportsUnboundedLobLocatorMaterialization, supportsUnique, supportsUniqueConstraintInCreateAlterTable, toBooleanValueString, toString, transformSelectString, useInputStreamToInsertBlob`

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

Constructor Detail

### DB2390Dialect

    public DB2390Dialect()

Method Detail

### supportsSequences

    public boolean supportsSequences()

  Description copied from class: `Dialect`
  Does this dialect support sequences?

  Overrides:
    `supportsSequences` in class `DB2Dialect`
  Returns:
    True if sequences supported; false otherwise.

### getIdentitySelectString

    public String getIdentitySelectString()

  Description copied from class: `Dialect`
  Get the select command to use to retrieve the last generated IDENTITY value.

  Overrides:
    `getIdentitySelectString` in class `DB2Dialect`
  Returns:
    The appropriate select command

### 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 `DB2Dialect`
  Returns:
    True if this dialect supports some form of LIMIT.

### 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.

### 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 `DB2Dialect`
  Returns:
    True if limit is relative from offset; false otherwise.

### 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 `DB2Dialect`
  Returns:
    True if bind variables can be used; false otherwise.

### getLimitString

    public String getLimitString(String sql,
                                 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 `DB2Dialect`
  Parameters:
    `sql` - 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.

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