mondrian.spi.impl
Class FirebirdDialect

java.lang.Object
  mondrian.spi.impl.JdbcDialectImpl
      mondrian.spi.impl.FirebirdDialect

All Implemented Interfaces:

Dialect

public class FirebirdDialect
extends JdbcDialectImpl

Implementation of Dialect for the Firebird database.

Since:

Nov 23, 2008

Author:

jhyde

Nested Class Summary

Nested classes/interfaces inherited from interface mondrian.spi.Dialect

Dialect.DatabaseProduct, Dialect.Datatype

Field Summary

static JdbcDialectFactory

FACTORY

Fields inherited from class mondrian.spi.impl.JdbcDialectImpl

databaseProduct, permitsSelectNotInGroupBy, productVersion

Constructor Summary

FirebirdDialect(Connection connection)
Creates a FirebirdDialect.

Method Summary

boolean	allowsAs() Returns whether the SQL dialect allows "AS" in the FROM clause.
String	generateOrderByNulls(String expr, boolean ascending, boolean collateNullsLast) Generates SQL to force null values to collate last.

Methods inherited from class mondrian.spi.impl.JdbcDialectImpl

allowsCompoundCountDistinct, allowsCountDistinct, allowsDdl, allowsDialectSharing, allowsFromQuery, allowsJoinOn, allowsMultipleCountDistinct, allowsMultipleDistinctSqlMeasures, allowsOrderByAlias, allowsRegularExpressionInWhereClause, allowsSelectNotInGroupBy, appendHintsAfterFromClause, caseWhenElse, deduceIdentifierQuoteString, deduceMaxColumnNameLength, deduceProductName, deduceProductVersion, deduceReadOnly, deduceSupportedResultSetStyles, deduceSupportsSelectNotInGroupBy, generateCountExpression, generateInline, generateInlineForAnsi, generateInlineGeneric, generateOrderByNullsAnsi, generateOrderItem, generateOrderItem, generateRegularExpression, getDatabaseProduct, getMaxColumnNameLength, getProduct, getQuoteIdentifierString, needsExponent, quote, quoteBooleanLiteral, quoteDateLiteral, quoteDateLiteral, quoteIdentifier, quoteIdentifier, quoteIdentifier, quoteIdentifier, quoteNumericLiteral, quoteStringLiteral, quoteTimeLiteral, quoteTimestampLiteral, requiresAliasForFromQuery, requiresGroupByAlias, requiresHavingAlias, requiresOrderByAlias, requiresUnionOrderByExprToBeInSelectClause, requiresUnionOrderByOrdinal, supportsGroupByExpressions, supportsGroupingSets, supportsMultiValueInExpr, supportsResultSetConcurrency, supportsUnlimitedValueList, toString, toUpper

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

FACTORY

public static final JdbcDialectFactory FACTORY

Constructor Detail

FirebirdDialect

public FirebirdDialect(Connection connection)
                throws SQLException

Creates a FirebirdDialect.

Parameters:

connection - Connection

Throws:

SQLException

Method Detail

allowsAs

public boolean allowsAs()

Description copied from interface: Dialect

Returns whether the SQL dialect allows "AS" in the FROM clause. If so, "SELECT * FROM t AS alias" is a valid query.

Specified by:

allowsAs in interface Dialect

Overrides:

allowsAs in class JdbcDialectImpl

Returns:

whether dialect allows AS in FROM clause

generateOrderByNulls

public String generateOrderByNulls(String expr,
                                   boolean ascending,
                                   boolean collateNullsLast)

Description copied from class: JdbcDialectImpl

Generates SQL to force null values to collate last.

This default implementation makes use of the ANSI SQL 1999 CASE-WHEN-THEN-ELSE in conjunction with IS NULL syntax. The resulting SQL will look something like this:

CASE WHEN "expr" IS NULL THEN 0 ELSE 1 END

You can override this method for a particular database to use something more efficient, like ISNULL().

ANSI SQL provides the syntax "ASC/DESC NULLS LAST" and "ASC/DESC NULLS FIRST". If your database supports the ANSI syntax, implement this method by calling JdbcDialectImpl.generateOrderByNullsAnsi(java.lang.String, boolean, boolean).

This method is only called from JdbcDialectImpl.generateOrderItem(String, boolean, boolean, boolean). Some dialects override that method and therefore never call this method.

Overrides:

generateOrderByNulls in class JdbcDialectImpl

Parameters:

expr - Expression.

ascending - Whether ascending.

collateNullsLast - Whether nulls should appear first or last.

Returns:

Expression to force null values to collate last or first.