Package org.apache.metamodel.jdbc.dialects

Class HsqldbQueryRewriter

java.lang.Object

org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

org.apache.metamodel.jdbc.dialects.HsqldbQueryRewriter

All Implemented Interfaces:

IQueryRewriter

public class HsqldbQueryRewriter
extends DefaultQueryRewriter

Query rewriter for HSQLDB

Constructor Summary

Constructors

Constructor	Description
HsqldbQueryRewriter(JdbcDataContext dataContext)

Method Summary

Modifier and Type	Method	Description
boolean	isFirstRowSupported(org.apache.metamodel.query.Query query)	Gets whether this query rewriter is able to write the "First row" query property to the query string.
boolean	isMaxRowsSupported()	Gets whether this query rewriter is able to write the "Max rows" query property to the query string.
boolean	needsQuoting(String alias, String identifierQuoteString)	HSQL converts all non-escaped characters to uppercases, this is prevented by always escaping
String	rewriteColumnType(org.apache.metamodel.schema.ColumnType columnType, Integer columnSize)	Rewrites the name of a column type, as it is written in CREATE TABLE statements.
String	rewriteFilterItem(org.apache.metamodel.query.FilterItem item)
protected String	rewriteSelectClause(org.apache.metamodel.query.Query query, org.apache.metamodel.query.SelectClause selectClause)

Methods inherited from class org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

beforeRewrite, escapeQuotes, isAggregateFunctionSupported, isPrimaryKeySupported, isScalarFunctionSupported, rewriteFilterItemWithOperandLiteral, rewriteTimestamp

Methods inherited from class org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

getColumnType, getDataContext, getResultSetValue, isSchemaIncludedInColumnPaths, isSupportedVersion, isTransactional, rewriteColumnTypeInternal, rewriteFromClause, rewriteFromItem, rewriteFromItem, rewriteGroupByClause, rewriteGroupByItem, rewriteHavingClause, rewriteOrderByClause, rewriteOrderByItem, rewriteQuery, rewriteSelectItem, rewriteWhereClause, setStatementParameter, toTime, toTimestamp

Methods inherited from class java.lang.Object

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

Constructor Detail

HsqldbQueryRewriter

public HsqldbQueryRewriter(JdbcDataContext dataContext)

Method Detail

rewriteColumnType

public String rewriteColumnType(org.apache.metamodel.schema.ColumnType columnType,
                                Integer columnSize)

Description copied from interface: IQueryRewriter

Rewrites the name of a column type, as it is written in CREATE TABLE statements. Some databases dont support all column types, or have different names for them. The implementation of this method will do that conversion.

Specified by:

rewriteColumnType in interface IQueryRewriter

Overrides:

rewriteColumnType in class DefaultQueryRewriter

Parameters:

columnType - the (non-null) ColumnType to rewrite

columnSize - the (possibly null) column size that may or may not have been specified

Returns:

isFirstRowSupported

public boolean isFirstRowSupported(org.apache.metamodel.query.Query query)

Description copied from interface: IQueryRewriter

Gets whether this query rewriter is able to write the "First row" query property to the query string.

Specified by:

isFirstRowSupported in interface IQueryRewriter

Overrides:

isFirstRowSupported in class DefaultQueryRewriter

Parameters:

query - For some database engines, the content of the query decides the ability to change first row

Returns:

whether this query rewriter is able to write the "First row" query property to the query string.

isMaxRowsSupported

public boolean isMaxRowsSupported()

Description copied from interface: IQueryRewriter

Gets whether this query rewriter is able to write the "Max rows" query property to the query string.

Specified by:

isMaxRowsSupported in interface IQueryRewriter

Overrides:

isMaxRowsSupported in class DefaultQueryRewriter

Returns:

whether this query rewriter is able to write the "Max rows" query property to the query string.

rewriteSelectClause

protected String rewriteSelectClause(org.apache.metamodel.query.Query query,
                                     org.apache.metamodel.query.SelectClause selectClause)

Overrides:

rewriteSelectClause in class AbstractQueryRewriter

rewriteFilterItem

public String rewriteFilterItem(org.apache.metamodel.query.FilterItem item)

Specified by:

rewriteFilterItem in interface IQueryRewriter

Overrides:

rewriteFilterItem in class DefaultQueryRewriter

needsQuoting

public boolean needsQuoting(String alias,
                            String identifierQuoteString)

HSQL converts all non-escaped characters to uppercases, this is prevented by always escaping

Overrides:

needsQuoting in class DefaultQueryRewriter