Package org.apache.metamodel.jdbc.dialects

Class OffsetFetchQueryRewriter

java.lang.Object

org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

org.apache.metamodel.jdbc.dialects.OffsetFetchQueryRewriter

All Implemented Interfaces:

IQueryRewriter

Direct Known Subclasses:

OracleQueryRewriter, SQLServerQueryRewriter

public abstract class OffsetFetchQueryRewriter
extends DefaultQueryRewriter

Query rewriter for databases that support OFFSET and FETCH keywords for max rows and first row properties.

Constructor Summary

Constructors

Constructor	Description
OffsetFetchQueryRewriter(JdbcDataContext dataContext, int minSupportedVersion, boolean fetchNeedsOrderBy)

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.
String	rewriteQuery(org.apache.metamodel.query.Query query)	If the Max rows and First row property of the query is set, then we will use the database's "OFFSET i ROWS FETCH NEXT j ROWS ONLY" construct.

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

beforeRewrite, escapeQuotes, isAggregateFunctionSupported, isPrimaryKeySupported, isScalarFunctionSupported, needsQuoting, rewriteColumnType, rewriteFilterItem, 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, rewriteSelectClause, 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

OffsetFetchQueryRewriter

public OffsetFetchQueryRewriter(JdbcDataContext dataContext,
                                int minSupportedVersion,
                                boolean fetchNeedsOrderBy)

Method Detail

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.

rewriteQuery

public String rewriteQuery(org.apache.metamodel.query.Query query)

If the Max rows and First row property of the query is set, then we will use the database's "OFFSET i ROWS FETCH NEXT j ROWS ONLY" construct.

Specified by:

rewriteQuery in interface IQueryRewriter

Overrides:

rewriteQuery in class AbstractQueryRewriter