public void TestSession42_ReplicateSimple()
{
// close replica we just created and attach db file to our primary db as "replica"
dbReplica.Close();
dbPrimary.AttachDB(dbReplicaPath, "replica");
// verify that "main" has rows in TestTable1 and "replica" currently empty
var mainTestTable1Rows = dbPrimary.Query <TestTable1>("Select * FROM main.TestTable1;");
Assert.That(mainTestTable1Rows.Count, Is.GreaterThan(0));
var replicaTestTable1Rows = dbPrimary.Query <TestTable1>("Select * FROM replica.TestTable1;");
Assert.That(replicaTestTable1Rows.Count, Is.EqualTo(0));
// create a session for "main" database
Assert.That(dbPrimary.CreateSession("main", out session), Is.EqualTo(SQLite3.Result.OK));
// attach all tables [from "main"] to it
Assert.That(SQLiteSession.AttachToTable(session, null), Is.EqualTo(SQLite3.Result.OK));
// Note: we have not enabled watching for changes
// validate no changes have occurred
Assert.That(SQLiteSession.IsEmptySession(session), Is.True);
// see what it would take to make replica.table like main.table
#pragma warning disable IDE0018 // Inline variable declaration
string errMsg;
#pragma warning restore IDE0018 // Inline variable declaration
Assert.That(SQLiteSession.AddTableDiffToSession(session, "replica", nameof(TestTable1), out errMsg), Is.EqualTo(SQLite3.Result.OK));
Assert.That(SQLiteSession.AddTableDiffToSession(session, "replica", nameof(TestTable2), out errMsg), Is.EqualTo(SQLite3.Result.OK));
// session should no longer be empty, as tables differ and session should have the diff
Assert.That(SQLiteSession.IsEmptySession(session), Is.False);
// create change set
Assert.That(SQLiteSession.GenerateChangeSet(session, out SQLiteChangeSet changeSet), Is.EqualTo(SQLite3.Result.OK));
// done with our session
SQLiteSession.Delete(session);
// remove secondary db
dbPrimary.DetachDB("replica");
// reopen dbReplica
dbReplica = new SQLiteConnection(dbReplicaPath, storeDateTimeAsTicks: true);
// validate reopened replica db has no rows
replicaTestTable1Rows = dbReplica.Query <TestTable1>("Select * FROM TestTable1;");
Assert.That(replicaTestTable1Rows.Count, Is.EqualTo(0));
// apply change set to dbReplica
// should be no conflicts so conflict handler not called
Assert.That(dbReplica.ApplySessionChangeSet(changeSet, null, null, null), Is.EqualTo(SQLite3.Result.OK));
// validate has contents we expect
replicaTestTable1Rows = dbReplica.Query <TestTable1>("Select * FROM TestTable1;");
Assert.That(replicaTestTable1Rows.Count, Is.GreaterThan(0));
// generate inverse change set
Assert.That(SQLiteSession.InvertChangeSet(changeSet, out SQLiteChangeSet inverseChangeSet), Is.EqualTo(SQLite3.Result.OK));
using (inverseChangeSet)
{
// apply the inverse
Assert.That(dbReplica.ApplySessionChangeSet(inverseChangeSet, null, null, null), Is.EqualTo(SQLite3.Result.OK));
// validate replica db once again has no rows
replicaTestTable1Rows = dbReplica.Query <TestTable1>("Select * FROM TestTable1;");
Assert.That(replicaTestTable1Rows.Count, Is.EqualTo(0));
}
// reset
CleanupTest();
SetupTest();
// insert differing row to dbReplica with same primary key, i.e. force conflict
// add a row to table
var newRow = new TestTable1
{
pk = sampleData.pk,
myString = "test conflict", // <== only conflicting piece of data
myInt = sampleData.myInt,
myDate = sampleData.myDate,
myTable2Object = sampleData.myTable2Object
};
Assert.That(dbReplica.Insert(newRow), Is.EqualTo(1));
// apply change set to dbReplica
// should now be a conflict so conflict handler is called
Assert.That(dbReplica.ApplySessionChangeSet(changeSet, DummyFilterCallback /* null */, SQLiteSession.CallbackReplaceOnConflicts, null /*"my text context"*/), Is.EqualTo(SQLite3.Result.OK));
// valid has contents we expect
replicaTestTable1Rows = dbReplica.Query <TestTable1>("Select * FROM TestTable1;");
Assert.That(replicaTestTable1Rows.Count, Is.GreaterThan(0));
// release our change set buffer explicitly
changeSet.Dispose();
}