Imported Upstream version 5.3.21
[platform/upstream/libdb.git] / docs / csharp / html / Overload_BerkeleyDB_HashCursor_MovePrevUnique.htm
1 <html xmlns:MSHelp="http://msdn.microsoft.com/mshelp" xmlns:mshelp="http://msdn.microsoft.com/mshelp" xmlns:ddue="http://ddue.schemas.microsoft.com/authoring/2003/5" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:msxsl="urn:schemas-microsoft-com:xslt"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8" /><META NAME="save" CONTENT="history" /><title>MovePrevUnique Method </title><link rel="stylesheet" type="text/css" href="../styles/presentation.css" /><link rel="stylesheet" type="text/css" href="ms-help://Hx/HxRuntime/HxLink.css" /><script type="text/javascript" src="../scripts/EventUtilities.js"> </script><script type="text/javascript" src="../scripts/SplitScreen.js"> </script><script type="text/javascript" src="../scripts/Dropdown.js"> </script><script type="text/javascript" src="../scripts/script_manifold.js"> </script><script type="text/javascript" src="../scripts/script_feedBack.js"> </script><script type="text/javascript" src="../scripts/CheckboxMenu.js"> </script><script type="text/javascript" src="../scripts/CommonUtilities.js"> </script><meta name="container" content="BerkeleyDB" /><meta name="file" content="Overload_BerkeleyDB_HashCursor_MovePrevUnique" /><meta name="guid" content="Overload_BerkeleyDB_HashCursor_MovePrevUnique" /><xml><MSHelp:Attr Name="AssetID" Value="Overload:BerkeleyDB.HashCursor.MovePrevUnique" /><MSHelp:TOCTitle Title="MovePrevUnique Method " /><MSHelp:RLTitle Title="HashCursor.MovePrevUnique Method  (BerkeleyDB)" /><MSHelp:Keyword Index="A" Term="Overload:BerkeleyDB.HashCursor.MovePrevUnique" /><MSHelp:Keyword Index="A" Term="frlrfBerkeleyDBHashCursorClassMovePrevUniqueTopic" /><MSHelp:Keyword Index="K" Term="MovePrevUnique method" /><MSHelp:Keyword Index="K" Term="HashCursor.MovePrevUnique method" /><MSHelp:Keyword Index="F" Term="MovePrevUnique" /><MSHelp:Keyword Index="F" Term="HashCursor.MovePrevUnique" /><MSHelp:Keyword Index="F" Term="BerkeleyDB.HashCursor.MovePrevUnique" /><MSHelp:Attr Name="DevLang" Value="CSharp" /><MSHelp:Attr Name="DevLang" Value="VB" /><MSHelp:Attr Name="DevLang" Value="C++" /><MSHelp:Attr Name="Locale" Value="en-us" /><MSHelp:Attr Name="TopicType" Value="kbSyntax" /><MSHelp:Attr Name="TopicType" Value="apiref" /><MSHelp:Attr Name="AssemblyVersion" Value="5.3.21.0" /></xml></head><body><input type="hidden" id="userDataCache" class="userDataStyle" /><input type="hidden" id="hiddenScrollOffset" /><img id="collapseImage" style="display:none; height:0; width:0;" src="../icons/collapse_all.gif" title="Collapse image" /><img id="expandImage" style="display:none; height:0; width:0;" src="../icons/expand_all.gif" title="Expand Image" /><img id="collapseAllImage" style="display:none; height:0; width:0;" src="../icons/collapse_all.gif" /><img id="expandAllImage" style="display:none; height:0; width:0;" src="../icons/expand_all.gif" /><img id="dropDownImage" style="display:none; height:0; width:0;" src="../icons/dropdown.gif" /><img id="dropDownHoverImage" style="display:none; height:0; width:0;" src="../icons/dropdownHover.gif" /><img id="copyImage" style="display:none; height:0; width:0;" src="../icons/copycode.gif" title="Copy image" /><img id="copyHoverImage" style="display:none; height:0; width:0;" src="../icons/copycodeHighlight.gif" title="CopyHover image" /><div id="header"><table id="topTable" cellspacing="0" cellpadding="0"><tr><td><span onclick="ExpandCollapseAll(toggleAllImage)" style="cursor:default;" onkeypress="ExpandCollapseAll_CheckKey(toggleAllImage, event)" tabindex="0"><img ID="toggleAllImage" class="toggleAll" src="../icons/collapse_all.gif" /> <label id="collapseAllLabel" for="toggleAllImage" style="display: none;">Collapse All</label><label id="expandAllLabel" for="toggleAllImage" style="display: none;">Expand All</label> </span><span>    </span><span id="devlangsDropdown" class="filter" tabindex="0"><img id="devlangsDropdownImage" src="../icons/dropdown.gif" /> <label id="devlangsMenuAllLabel" for="devlangsDropdownImage" style="display: none;"><nobr>Code: All </nobr></label><label id="devlangsMenuMultipleLabel" for="devlangsDropdownImage" style="display: none;"><nobr>Code: Multiple </nobr></label><label id="devlangsMenuCSharpLabel" for="devlangsDropdownImage" style="display: none;"><nobr>Code: C# </nobr></label><label id="devlangsMenuVisualBasicLabel" for="devlangsDropdownImage" style="display: none;"><nobr>Code: Visual Basic </nobr></label><label id="devlangsMenuManagedCPlusPlusLabel" for="devlangsDropdownImage" style="display: none;"><nobr>Code: Visual C++ </nobr></label></span><span>    </span><span id="memberOptionsDropdown" class="filter" tabindex="0"><img id="memberOptionsDropdownImage" src="../icons/dropdown.gif" /> <label id="memberOptionsMenuAllLabel" for="memberOptionsDropdownImage" style="display: none;"><nobr>Members: Show All </nobr></label><label id="memberOptionsMenuMultipleLabel" for="memberOptionsDropdownImage" style="display: none;"><nobr>Members: Filtered </nobr></label><label id="memberOptionsMenuProtectedLabel" for="memberOptionsDropdownImage" style="display: none;"><nobr>Members: Filtered </nobr></label><label id="memberOptionsMenuInheritedLabel" for="memberOptionsDropdownImage" style="display: none;"><nobr>Members: Filtered </nobr></label></span></td></tr></table><div id="devlangsMenu"><input id="CSharpCheckbox" type="checkbox" data="CSharp,cs,'persist'" value="on" onClick="SetLanguage(this)" /><label class="checkboxLabel" for="CSharpCheckbox">C#</label><br /><input id="VisualBasicCheckbox" type="checkbox" data="VisualBasic,vb,'persist'" value="on" onClick="SetLanguage(this)" /><label class="checkboxLabel" for="VisualBasicCheckbox">Visual Basic</label><br /><input id="ManagedCPlusPlusCheckbox" type="checkbox" data="ManagedCPlusPlus,cpp,'persist'" value="on" onClick="SetLanguage(this)" /><label class="checkboxLabel" for="ManagedCPlusPlusCheckbox">Visual C++</label><br /></div><div id="memberOptionsMenu"><input id="ProtectedCheckbox" type="checkbox" data="Protected" value="on" onClick="SetMemberOptions(this, 'vis')" /><label class="checkboxLabel" for="ProtectedCheckbox">Include Protected Members</label><br /><input id="InheritedCheckbox" type="checkbox" data="Inherited" value="on" onClick="SetMemberOptions(this, 'decl')" /><label class="checkboxLabel" for="InheritedCheckbox">Include Inherited Members</label><br /></div><table id="bottomTable" cellpadding="0" cellspacing="0"><tr id="headerTableRow1"><td align="left"><span id="runningHeaderText">Berkeley DB .NET API Documentation</span></td></tr><tr id="headerTableRow2"><td align="left"><span id="nsrTitle">HashCursor<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span></span>MovePrevUnique Method </span></td></tr><tr id="headerTableRow3"><td align="left"><a href="T_BerkeleyDB_HashCursor.htm">HashCursor Class</a>  <a href="#seeAlsoToggle" onclick="OpenSection(seeAlsoToggle)">See Also</a>  \r
2   <span id="headfeedbackarea" class="feedbackhead">\r
3       <a href="javascript:SubmitFeedback('','Berkeley DB .NET API Documentation','','','','%0\dYour%20feedback%20is%20used%20to%20improve%20the%20documentation%20and%20the%20product.%20Your%20e-mail%20address%20will%20not%20be%20used%20for%20any%20other%20purpose%20and%20is%20disposed%20of%20after%20the%20issue%20you%20report%20is%20resolved.%20%20While%20working%20to%20resolve%20the%20issue%20that%20you%20report,%20you%20may%20be%20contacted%20via%20e-mail%20to%20get%20further%20details%20or%20clarification%20on%20the%20feedback%20you%20sent.%20After%20the%20issue%20you%20report%20has%20been%20addressed,%20you%20may%20receive%20an%20e-mail%20to%20let%20you%20know%20that%20your%20feedback%20has%20been%20addressed.%0\A%0\d','Customer%20Feedback');">\r
4         \r
5         Send Feedback\r
6       </a>\r
7         </span>\r
8 </td></tr></table><table id="gradientTable"><tr><td class="nsrBottom" background="../icons/gradient.gif" /></tr></table></div><div id="mainSection"><div id="mainBody"><div id="allHistory" class="saveHistory" onsave="saveAll()" onload="loadAll()" /><span style="color: DarkGray"> </span><h1 class="heading"><span onclick="ExpandCollapse(overloadMembersTableToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(overloadMembersTableToggle, event)" tabindex="0"><img id="overloadMembersTableToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Overload List</span></h1><div id="overloadMembersTableSection" class="section" name="collapseableSection" style=""><table id="memberList" class="members" frame="lhs" cellpadding="2"><col width="10%" /><tr><th class="iconColumn">\r
9                \r
10             </th><th class="nameColumn">Name</th><th class="descriptionColumn">Description</th></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" title="Public method" /></td><td><a href="M_BerkeleyDB_Cursor_MovePrevUnique.htm">MovePrevUnique<span class="languageSpecificText"><span class="cs">()</span><span class="cpp">()</span><span class="nu">()</span></span></a></td><td><div class="summary">\r
11             If the cursor is not yet initialized, MovePrevUnique is identical to \r
12             <a href="M_BerkeleyDB_Cursor_MoveLast.htm">MoveLast<span class="languageSpecificText"><span class="cs">()</span><span class="cpp">()</span><span class="nu">()</span></span></a>. Otherwise, move the cursor to the previous\r
13             non-duplicate key in the database, and store that key and associated\r
14             datum in <a href="P_BerkeleyDB_Cursor_Current.htm">Current</a>. MovePrevUnique will return false if\r
15             no non-duplicate key/data pairs exist after the cursor position in\r
16             the database. \r
17             </div> (Inherited from <a href="T_BerkeleyDB_Cursor.htm">Cursor</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" title="Public method" /></td><td><a href="M_BerkeleyDB_Cursor_MovePrevUnique_3.htm">MovePrevUnique(LockingInfo)</a></td><td><div class="summary">\r
18             If the cursor is not yet initialized, MovePrevUnique is identical to \r
19             <a href="M_BerkeleyDB_Cursor_MoveLast_3.htm">MoveLast(LockingInfo)</a>. Otherwise, move the cursor to\r
20             the previous non-duplicate key in the database, and store that key\r
21             and associated datum in <a href="P_BerkeleyDB_Cursor_Current.htm">Current</a>. MovePrevUnique will\r
22             return false if no non-duplicate key/data pairs exist after the\r
23             cursor position in the database. \r
24             </div> (Inherited from <a href="T_BerkeleyDB_Cursor.htm">Cursor</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" title="Public method" /></td><td><a href="M_BerkeleyDB_Cursor_MovePrevUnique_1.htm">MovePrevUnique(DatabaseEntry, DatabaseEntry)</a></td><td><div class="summary">\r
25             If the cursor is not yet initialized, MovePrevUnique is identical to \r
26             <a href="M_BerkeleyDB_Cursor_MoveLast.htm">MoveLast<span class="languageSpecificText"><span class="cs">()</span><span class="cpp">()</span><span class="nu">()</span></span></a>. Otherwise, move the cursor to the previous\r
27             non-duplicate key in the database, and store that key and associated\r
28             datum in <a href="P_BerkeleyDB_Cursor_Current.htm">Current</a>. MovePrevUnique will return false if\r
29             ntheo non-duplicate key/data pairs exist after the cursor position in\r
30             database. If either the key or the data is partial\r
31             <a href="T_BerkeleyDB_DatabaseEntry.htm">DatabaseEntry</a>, its\r
32             <a href="P_BerkeleyDB_DatabaseEntry_PartialLen.htm">PartialLen</a> bytes starting\r
33             <a href="P_BerkeleyDB_DatabaseEntry_PartialOffset.htm">PartialOffset</a> bytes from the beginning\r
34             of the retrieved data record are returned as if they comprised the\r
35             entire record. If any or all of the specified bytes do not exist\r
36             in the record, MovePrevUnique is successful, and any existing\r
37             bytes are returned.\r
38             </div> (Inherited from <a href="T_BerkeleyDB_Cursor.htm">Cursor</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" title="Public method" /></td><td><a href="M_BerkeleyDB_Cursor_MovePrevUnique_2.htm">MovePrevUnique(DatabaseEntry, DatabaseEntry, LockingInfo)</a></td><td><div class="summary">\r
39             If the cursor is not yet initialized, MovePrevUnique is identical to \r
40             <a href="M_BerkeleyDB_Cursor_MoveLast_3.htm">MoveLast(LockingInfo)</a>. Otherwise, move the cursor to\r
41             the previous non-duplicate key in the database, and store that key\r
42             and associated datum in <a href="P_BerkeleyDB_Cursor_Current.htm">Current</a>. MovePrevUnique will\r
43             return false if no non-duplicate key/data pairs exist after the\r
44             cursor position in the database. If either the key or the data\r
45             is partial <a href="T_BerkeleyDB_DatabaseEntry.htm">DatabaseEntry</a>, its\r
46             <a href="P_BerkeleyDB_DatabaseEntry_PartialLen.htm">PartialLen</a> bytes starting\r
47             <a href="P_BerkeleyDB_DatabaseEntry_PartialOffset.htm">PartialOffset</a> bytes from the beginning\r
48             of the retrieved data record are returned as if they comprised the\r
49             entire record. If any or all of the specified bytes do not exist\r
50             in the record, MovePrevUnique is successful, and any existing\r
51             bytes are returned.\r
52             </div> (Inherited from <a href="T_BerkeleyDB_Cursor.htm">Cursor</a>.)</td></tr></table></div><h1 class="heading"><span onclick="ExpandCollapse(seeAlsoToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(seeAlsoToggle, event)" tabindex="0"><img id="seeAlsoToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />See Also</span></h1><div id="seeAlsoSection" class="section" name="collapseableSection" style=""><div class="seeAlsoStyle"><a href="T_BerkeleyDB_HashCursor.htm">HashCursor Class</a></div><div class="seeAlsoStyle"><a href="AllMembers_T_BerkeleyDB_HashCursor.htm">HashCursor Members</a></div><div class="seeAlsoStyle"><a href="N_BerkeleyDB.htm">BerkeleyDB Namespace</a></div></div></div><div id="footer"><div class="footerLine"><img width="100%" height="3px" src="../icons/footer.gif" title="Footer image" /></div><A NAME="feedback"></A><span id="fb" class="feedbackcss"> </span>\r
53 Report Feedback on this item in the Oracle Technology Network Forum <p />Copyright (c) 2008, 2012 Oracle. All rights reserved.</div></div></body></html>