With version 2 storage this will revert the contents of tree to it's initial state when the file was first opened, or to the state captured with the last call to commit. Any transaction log data will be truncated.

Syntax

Visual Basic (Declaration)
Public Sub Rollback()

C#
public void Rollback()

Exceptions

Exception	Description
System.InvalidOperationException	Raised when called for a BPlusTree that is not using v2 files

Example

BPlusTree/BPlusTree.Test/BasicTestsVersion2.cs

C#	Copy Code
using (BPlusTree<int, string> tree = Create(Options)) { tree.EnableCount(); Assert.AreEqual(0, tree.Count); tree.Rollback(); Assert.AreEqual(0, tree.Count); tree.Commit(); Assert.AreEqual(0, tree.Count); tree.Add(1, "A"); tree.Rollback(); Assert.AreEqual(0, tree.Count); tree.Commit(); Assert.AreEqual(0, tree.Count); tree.Add(1, "A"); tree.Commit(); Assert.AreEqual(1, tree.Count); tree.Rollback(); Assert.AreEqual(1, tree.Count); tree.Add(2, "B"); tree.Rollback(); Assert.AreEqual(1, tree.Count); tree[1] = "abc"; tree.Commit(); Assert.AreEqual(1, tree.Count); tree.Rollback(); Assert.AreEqual("abc", tree[1]); Assert.IsFalse(tree.ContainsKey(2)); }

Copy Code

using (BPlusTree<int, string> tree = Create(Options))
{
    tree.EnableCount();
    Assert.AreEqual(0, tree.Count);
    tree.Rollback();
    Assert.AreEqual(0, tree.Count);
    tree.Commit();
    Assert.AreEqual(0, tree.Count);

    tree.Add(1, "A");
    tree.Rollback();
    Assert.AreEqual(0, tree.Count);
    tree.Commit();
    Assert.AreEqual(0, tree.Count);

    tree.Add(1, "A");
    tree.Commit();
    Assert.AreEqual(1, tree.Count);
    tree.Rollback();
    Assert.AreEqual(1, tree.Count);

    tree.Add(2, "B");
    tree.Rollback();
    Assert.AreEqual(1, tree.Count);
    tree[1] = "abc";
    tree.Commit();
    Assert.AreEqual(1, tree.Count);
    tree.Rollback();

    Assert.AreEqual("abc", tree[1]);
    Assert.IsFalse(tree.ContainsKey(2));
}

VB.NET	Copy Code
Using tree As BPlusTree(Of Integer, String) = Create(Options) tree.EnableCount() Assert.AreEqual(0, tree.Count) tree.Rollback() Assert.AreEqual(0, tree.Count) tree.Commit() Assert.AreEqual(0, tree.Count) tree.Add(1, "A") tree.Rollback() Assert.AreEqual(0, tree.Count) tree.Commit() Assert.AreEqual(0, tree.Count) tree.Add(1, "A") tree.Commit() Assert.AreEqual(1, tree.Count) tree.Rollback() Assert.AreEqual(1, tree.Count) tree.Add(2, "B") tree.Rollback() Assert.AreEqual(1, tree.Count) tree(1) = "abc" tree.Commit() Assert.AreEqual(1, tree.Count) tree.Rollback() Assert.AreEqual("abc", tree(1)) Assert.IsFalse(tree.ContainsKey(2)) End Using

VB.NET

Copy Code

Using tree As BPlusTree(Of Integer, String) = Create(Options)
    tree.EnableCount()
    Assert.AreEqual(0, tree.Count)
    tree.Rollback()
    Assert.AreEqual(0, tree.Count)
    tree.Commit()
    Assert.AreEqual(0, tree.Count)

    tree.Add(1, "A")
    tree.Rollback()
    Assert.AreEqual(0, tree.Count)
    tree.Commit()
    Assert.AreEqual(0, tree.Count)

    tree.Add(1, "A")
    tree.Commit()
    Assert.AreEqual(1, tree.Count)
    tree.Rollback()
    Assert.AreEqual(1, tree.Count)

    tree.Add(2, "B")
    tree.Rollback()
    Assert.AreEqual(1, tree.Count)
    tree(1) = "abc"
    tree.Commit()
    Assert.AreEqual(1, tree.Count)
    tree.Rollback()

    Assert.AreEqual("abc", tree(1))
    Assert.IsFalse(tree.ContainsKey(2))
End Using

Requirements

Target Platforms: Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7

Syntax

Exceptions

Example

Requirements

See Also

Reference

Source Code

CSharpTest.Net
Rollback Method
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