sqltuplereader.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_15) on Thu Jul 31 17:20:13 EDT 2008 --><TITLE>SqlTupleReader (Mondrian OLAP Server, version 3.0.4.11371)</TITLE><META NAME="keywords" CONTENT="mondrian.rolap.SqlTupleReader class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="SqlTupleReader (Mondrian OLAP Server, version 3.0.4.11371)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../mondrian/rolap/SqlStatement.html" title="class in mondrian.rolap"><B>PREV CLASS</B></A> <A HREF="../../mondrian/rolap/SqlTupleReader.WhichSelect.html" title="enum in mondrian.rolap"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?mondrian/rolap/SqlTupleReader.html" target="_top"><B>FRAMES</B></A> <A HREF="SqlTupleReader.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#nested_class_summary">NESTED</A> | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">mondrian.rolap</FONT><BR>Class SqlTupleReader</H2><PRE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>mondrian.rolap.SqlTupleReader</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../mondrian/rolap/TupleReader.html" title="interface in mondrian.rolap">TupleReader</A></DD></DL><HR><DL><DT><PRE>public class <B>SqlTupleReader</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../mondrian/rolap/TupleReader.html" title="interface in mondrian.rolap">TupleReader</A></DL></PRE><P>Reads the members of a single level (level.members) or of multiple levels (crossjoin). <p>Allows the result to be restricted by a <A HREF="../../mondrian/rolap/sql/TupleConstraint.html" title="interface in mondrian.rolap.sql"><CODE>TupleConstraint</CODE></A>. So the SqlTupleReader can also read Member.Descendants (which is level.members restricted to a common parent) and member.children (which is a special case of member.descendants). Other constraints, especially for the current slicer or evaluation context, are possible. <h3>Caching</h3> <p>When a SqlTupleReader reads level.members, it groups the result into parent/children pairs and puts them into the cache. In order that these can be found later when the children of a parent are requested, a matching constraint must be provided for every parent. <ul> <li>When reading members from a single level, then the constraint is not required to join the fact table in <A HREF="../../mondrian/rolap/sql/TupleConstraint.html#addLevelConstraint(mondrian.rolap.sql.SqlQuery, mondrian.rolap.RolapCube, mondrian.rolap.aggmatcher.AggStar, mondrian.rolap.RolapLevel)"><CODE>TupleConstraint.addLevelConstraint(mondrian.rolap.sql.SqlQuery, mondrian.rolap.RolapCube, mondrian.rolap.aggmatcher.AggStar, mondrian.rolap.RolapLevel)</CODE></A> although it may do so to restrict the result. Also it is permitted to cache the parent/children from all members in MemberCache, so <A HREF="../../mondrian/rolap/sql/TupleConstraint.html#getMemberChildrenConstraint(mondrian.rolap.RolapMember)"><CODE>TupleConstraint.getMemberChildrenConstraint(RolapMember)</CODE></A> should not return null.</li> <li>When reading multiple levels (i.e. we are performing a crossjoin), then we can not store the parent/child pairs in the MemberCache and <A HREF="../../mondrian/rolap/sql/TupleConstraint.html#getMemberChildrenConstraint(mondrian.rolap.RolapMember)"><CODE>TupleConstraint.getMemberChildrenConstraint(RolapMember)</CODE></A> must return null. Also <A HREF="../../mondrian/rolap/sql/TupleConstraint.html#addConstraint(mondrian.rolap.sql.SqlQuery, mondrian.rolap.RolapCube)"><CODE>TupleConstraint.addConstraint(mondrian.rolap.sql.SqlQuery, mondrian.rolap.RolapCube)</CODE></A> is required to join the fact table for the levels table.</li> </ul><P><P><DL><DT><B>Since:</B></DT> <DD>Nov 11, 2005</DD><DT><B>Version:</B></DT> <DD>$Id: //open/mondrian-release/3.0/src/main/mondrian/rolap/SqlTupleReader.java#5 $</DD><DT><B>Author:</B></DT> <DD>av</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><A NAME="nested_class_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Nested Class Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) static class</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/rolap/SqlTupleReader.WhichSelect.html" title="enum in mondrian.rolap">SqlTupleReader.WhichSelect</A></B></CODE><BR> Description of the position of a SELECT statement in a UNION.</TD></TR></TABLE> <A NAME="nested_classes_inherited_from_class_mondrian.rolap.TupleReader"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Nested classes/interfaces inherited from interface mondrian.rolap.<A HREF="../../mondrian/rolap/TupleReader.html" title="interface in mondrian.rolap">TupleReader</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../mondrian/rolap/TupleReader.MemberBuilder.html" title="interface in mondrian.rolap">TupleReader.MemberBuilder</A></CODE></TD></TR></TABLE> <!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Field Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) <A HREF="../../mondrian/rolap/sql/TupleConstraint.html" title="interface in mondrian.rolap.sql">TupleConstraint</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/rolap/SqlTupleReader.html#constraint">constraint</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) int</CODE></FONT></TD>⌨️ 快捷键说明
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