org.apache.metamodel.jdbc.dialects

Class LimitOffsetQueryRewriter

java.lang.Object

org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

org.apache.metamodel.jdbc.dialects.LimitOffsetQueryRewriter

All Implemented Interfaces:

IQueryRewriter

Direct Known Subclasses:

H2QueryRewriter, Hive2QueryRewriter, MysqlQueryRewriter, PostgresqlQueryRewriter

public abstract class LimitOffsetQueryRewriter
extends DefaultQueryRewriter

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

Constructor Summary

Constructors

Constructor and Description
LimitOffsetQueryRewriter(JdbcDataContext dataContext)

Method Summary

Modifier and Type	Method and Description
boolean	isFirstRowSupported(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(Query query) If the Max rows and/or First row property of the query is set, then we will use the database's LIMIT and OFFSET functions.

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

LimitOffsetQueryRewriter

public LimitOffsetQueryRewriter(JdbcDataContext dataContext)

Method Detail

isFirstRowSupported

public final boolean isFirstRowSupported(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 final 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(Query query)

If the Max rows and/or First row property of the query is set, then we will use the database's LIMIT and OFFSET functions.

Specified by:

rewriteQuery in interface IQueryRewriter

Overrides:

rewriteQuery in class AbstractQueryRewriter