Package mondrian.spi.impl

Class DerbyDialect

java.lang.Object

mondrian.spi.impl.JdbcDialectImpl

mondrian.spi.impl.DerbyDialect

All Implemented Interfaces:

Dialect

public class DerbyDialect
extends JdbcDialectImpl

Implementation of Dialect for the Apache Derby 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

Fields

Modifier and Type	Field	Description
static final JdbcDialectFactory	FACTORY

Fields inherited from class mondrian.spi.impl.JdbcDialectImpl

databaseProduct, permitsSelectNotInGroupBy, productVersion

Constructor Summary

Constructors

Constructor	Description
DerbyDialect(Connection connection)	Creates a DerbyDialect.

Method Summary

Modifier and Type	Method	Description
boolean	allowsMultipleCountDistinct()	Returns whether this Dialect supports more than one distinct aggregation in the same query.
String	generateInline(List<String> columnNames, List<String> columnTypes, List<String[]> valueList)	Generates a SQL statement to represent an inline dataset.
protected void	quoteDateLiteral(StringBuilder buf, String value, Date date)	Helper method for JdbcDialectImpl.quoteDateLiteral(StringBuilder, String).
boolean	requiresAliasForFromQuery()	Returns whether this Dialect requires subqueries in the FROM clause to have an alias.
boolean	supportsGroupByExpressions()	Returns whether this Dialect supports expressions in the GROUP BY clause.

Methods inherited from class mondrian.spi.impl.JdbcDialectImpl

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

Methods inherited from class java.lang.Object

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

Field Details

FACTORY

public static final JdbcDialectFactory FACTORY

Constructor Details

DerbyDialect

public DerbyDialect(Connection connection)
             throws SQLException

Creates a DerbyDialect.

Parameters:

connection - Connection

Throws:

SQLException

Method Details

quoteDateLiteral

protected void quoteDateLiteral(StringBuilder buf,
 String value,
 Date date)

Description copied from class: JdbcDialectImpl

Helper method for JdbcDialectImpl.quoteDateLiteral(StringBuilder, String).

Overrides:

quoteDateLiteral in class JdbcDialectImpl

Parameters:

buf - Buffer to append to

value - Value as string

date - Value as date

requiresAliasForFromQuery

public boolean requiresAliasForFromQuery()

Description copied from interface: Dialect

Returns whether this Dialect requires subqueries in the FROM clause to have an alias.

Specified by:

requiresAliasForFromQuery in interface Dialect

Overrides:

requiresAliasForFromQuery in class JdbcDialectImpl

Returns:

whether dialewct requires subqueries to have an alias

See Also:

• Dialect.allowsFromQuery()

allowsMultipleCountDistinct

public boolean allowsMultipleCountDistinct()

Description copied from interface: Dialect

Returns whether this Dialect supports more than one distinct aggregation in the same query.

In Derby 10.1,

select couunt(distinct x) from t

is OK, but

select couunt(distinct x), count(distinct y) from t

gives "Multiple DISTINCT aggregates are not supported at this time."

Specified by:

allowsMultipleCountDistinct in interface Dialect

Overrides:

allowsMultipleCountDistinct in class JdbcDialectImpl

Returns:

whether this Dialect supports more than one distinct aggregation in the same query

generateInline

public String generateInline(List<String> columnNames,
 List<String> columnTypes,
 List<String[]> valueList)

Description copied from interface: Dialect

Generates a SQL statement to represent an inline dataset.

For example, for Oracle, generates

 SELECT 1 AS FOO, 'a' AS BAR FROM dual
 UNION ALL
 SELECT 2 AS FOO, 'b' AS BAR FROM dual
 

For ANSI SQL, generates:

 VALUES (1, 'a'), (2, 'b')
 

Specified by:

generateInline in interface Dialect

Overrides:

generateInline in class JdbcDialectImpl

Parameters:

columnNames - List of column names

columnTypes - List of column types ("String" or "Numeric")

valueList - List of rows values

Returns:

SQL string

supportsGroupByExpressions

public boolean supportsGroupByExpressions()

Description copied from interface: Dialect

Returns whether this Dialect supports expressions in the GROUP BY clause. Derby/Cloudscape and Infobright do not.

Specified by:

supportsGroupByExpressions in interface Dialect

Overrides:

supportsGroupByExpressions in class JdbcDialectImpl

Returns:

Whether this Dialect allows expressions in the GROUP BY clause