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Nicolas Wavrant
ZODB
Commits
357cc30d
Commit
357cc30d
authored
Mar 12, 2004
by
Tim Peters
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Checkpointing more progress.
parent
2d8455d9
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src/ZODB/tests/testmvcc.py
src/ZODB/tests/testmvcc.py
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src/ZODB/tests/testmvcc.py
View file @
357cc30d
...
...
@@ -100,8 +100,7 @@ Basic functionality
-------------------
The next bit of code includes a simple MVCC test. One transaction
will begin and modify "a." The other transaction will then modify "b"
and commit.
will modify "a." The other transaction will then modify "b" and commit.
>>> r1 = cn1.root()
>>> r1["a"].value = 2
...
...
@@ -119,10 +118,12 @@ transaction.
>>> r2 = cn2.root()
>>> r2["b"]._p_serial < cn2._txn_time
True
>>> r2["b"].value
1
>>> r2["b"].value = 2
It is not safe, however, to read the current revision
"a," because it
was modified at the high-water mark. If we read it, we'll get a
It is not safe, however, to read the current revision
of "a" because
it
was modified at the high-water mark. If we read it, we'll get a
non-current version.
>>> r2["a"].value
...
...
@@ -136,7 +137,7 @@ storage.
>>> db._storage.isCurrent(r2["a"]._p_oid, r2["a"]._p_serial)
False
It's possible to modify "a
,"
but we get a conflict error when we
It's possible to modify "a
",
but we get a conflict error when we
commit the transaction.
>>> r2["a"].value = 3
...
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@@ -147,12 +148,15 @@ ConflictError: database conflict error (oid 0000000000000001, class ZODB.tests.M
The failed commit aborted the current transaction, so we can try
again. This example will demonstrate that we can commit a transaction
if we
don't modify the object that isn't current
.
if we
only modify current revisions
.
>>> cn2._txn_time
>>> print cn2._txn_time
None
>>> r1 = cn1.root()
>>> r1["a"].value = 3
>>> txn1 is cn1.getTransaction()
True
>>> cn1.getTransaction().commit()
>>> txn = db.lastTransaction()
>>> cn2._txn_time == txn
...
...
@@ -162,7 +166,8 @@ True
>>> r2["b"].value
3
>>> txn2.commit()
>>> cn2._txn_time
>>> print cn2._txn_time
None
Object cache
------------
...
...
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