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, 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.

Field Summary

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

logger

Constructor Summary

LimitOffsetQueryRewriter(JdbcDataContext dataContext)

Method Summary

boolean	isFirstRowSupported() 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, rewriteFilterItem

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

getColumnType, getDataContext, isSchemaIncludedInColumnPaths, rewriteColumnType, rewriteFromClause, rewriteFromItem, rewriteFromItem, rewriteGroupByClause, rewriteGroupByItem, rewriteHavingClause, rewriteOrderByClause, rewriteOrderByItem, rewriteSelectClause, rewriteSelectItem, rewriteWhereClause

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()

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

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