public class VerticaDialect extends JdbcDialectImpl
Dialect for the Vertica database.Dialect.DatabaseProduct, Dialect.Datatype| Modifier and Type | Field and Description |
|---|---|
static JdbcDialectFactory |
FACTORY |
databaseProduct, permitsSelectNotInGroupBy, productVersion| Constructor and Description |
|---|
VerticaDialect(Connection connection)
Creates a VerticaDialect.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
allowsCountDistinctWithOtherAggs()
Returns whether this Dialect supports distinct
aggregations with other aggregations in the same query.
|
boolean |
allowsFromQuery()
Returns whether this Dialect allows a subquery in the from clause,
for example
SELECT * FROM (SELECT * FROM t) AS
x |
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.
|
Dialect.DatabaseProduct |
getDatabaseProduct()
Returns the database for this Dialect, or
Dialect.DatabaseProduct.UNKNOWN if the database is
not a common database. |
SqlStatement.Type |
getType(ResultSetMetaData metaData,
int columnIndex)
Chooses the most appropriate type for accessing the values of a
column in a result set for a dialect.
|
boolean |
requiresAliasForFromQuery()
Returns whether this Dialect requires subqueries in the FROM clause
to have an alias.
|
boolean |
supportsMultiValueInExpr()
Returns true if this dialect supports multi-value IN expressions.
|
boolean |
supportsResultSetConcurrency(int type,
int concurrency)
Returns whether this Dialect supports the given concurrency type
in combination with the given result set type.
|
allowsAs, allowsCompoundCountDistinct, allowsCountDistinct, allowsDdl, allowsDialectSharing, allowsJoinOn, allowsMultipleDistinctSqlMeasures, allowsOrderByAlias, allowsRegularExpressionInWhereClause, allowsSelectNotInGroupBy, appendHintsAfterFromClause, caseWhenElse, computeStatisticsProviders, deduceIdentifierQuoteString, deduceMaxColumnNameLength, deduceProductName, deduceProductVersion, deduceReadOnly, deduceSupportedResultSetStyles, deduceSupportsSelectNotInGroupBy, generateCountExpression, generateInlineForAnsi, generateInlineGeneric, generateOrderByNulls, generateOrderByNullsAnsi, generateOrderItem, generateRegularExpression, getMaxColumnNameLength, getProduct, getQuoteIdentifierString, getStatisticsProviders, isDatabase, needsExponent, quote, quoteBooleanLiteral, quoteDateLiteral, quoteDateLiteral, quoteIdentifier, quoteIdentifier, quoteIdentifier, quoteIdentifier, quoteNumericLiteral, quoteStringLiteral, quoteTimeLiteral, quoteTimestampLiteral, requiresGroupByAlias, requiresHavingAlias, requiresOrderByAlias, requiresUnionOrderByExprToBeInSelectClause, requiresUnionOrderByOrdinal, supportsGroupByExpressions, supportsGroupingSets, supportsUnlimitedValueList, toString, toUpperpublic static final JdbcDialectFactory FACTORY
public VerticaDialect(Connection connection) throws SQLException
connection - ConnectionSQLExceptionpublic boolean requiresAliasForFromQuery()
DialectrequiresAliasForFromQuery in interface DialectrequiresAliasForFromQuery in class JdbcDialectImplDialect.allowsFromQuery()public boolean allowsFromQuery()
DialectSELECT * FROM (SELECT * FROM t) AS
xallowsFromQuery in interface DialectallowsFromQuery in class JdbcDialectImplDialect.requiresAliasForFromQuery()public Dialect.DatabaseProduct getDatabaseProduct()
DialectDialect.DatabaseProduct.UNKNOWN if the database is
not a common database.getDatabaseProduct in interface DialectgetDatabaseProduct in class JdbcDialectImplpublic boolean allowsMultipleCountDistinct()
DialectIn 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."allowsMultipleCountDistinct in interface DialectallowsMultipleCountDistinct in class JdbcDialectImplpublic boolean allowsCountDistinctWithOtherAggs()
DialectallowsCountDistinctWithOtherAggs in interface DialectallowsCountDistinctWithOtherAggs in class JdbcDialectImplpublic boolean supportsResultSetConcurrency(int type,
int concurrency)
DialectThe result is similar to
DatabaseMetaData.supportsResultSetConcurrency(int, int),
except that the JdbcOdbc bridge in JDK 1.6 overstates its abilities.
See bug 1690406.
supportsResultSetConcurrency in interface DialectsupportsResultSetConcurrency in class JdbcDialectImpltype - defined in ResultSetconcurrency - type defined in ResultSettrue if so; false otherwisepublic String generateInline(List<String> columnNames, List<String> columnTypes, List<String[]> valueList)
DialectFor 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')
generateInline in interface DialectgenerateInline in class JdbcDialectImplcolumnNames - List of column namescolumnTypes - List of column types ("String" or "Numeric")valueList - List of rows valuespublic SqlStatement.Type getType(ResultSetMetaData metaData, int columnIndex) throws SQLException
DialectChooses the most appropriate type for accessing the values of a column in a result set for a dialect.
Dialect-specific nuances involving type representation should be encapsulated in implementing methods. For example, if a dialect has implicit rules involving scale or precision, they should be handled within this method so the client can simply retrieve the "best fit" SqlStatement.Type for the column.
getType in interface DialectgetType in class JdbcDialectImplmetaData - Results set metadatacolumnIndex - Column ordinal (0-based)SQLExceptionpublic boolean supportsMultiValueInExpr()
DialectWHERE (col1, col2) IN ((val1a, val2a), (val1b, val2b))supportsMultiValueInExpr in interface DialectsupportsMultiValueInExpr in class JdbcDialectImplCopyright © 2018 Hitachi Vantara. All rights reserved.