public override void Perform(SchemaChanges changes, IOutput output)
{
using (var block = output.ProgressBlock())
{
var desired = OldVersionCacheMigrationType.AllFrom(changes.Desired).Single();
// Because this is guaranteed to be last in the prerequisite run, we know the storage tables are fully created and we can start using them.
changes.SetStorageAvailable();
var storage = changes.Storage;
// If the migration has already run, OR the storage tables already contain Complete (implying they've already been populated by a full run
// or migration) then we don't run it again.
if (storage.ContainsRoot(desired.Identifier) ||
storage.ContainsRoot(CompletionType.Create().Identifier))
{
return;
}
var chunks = block.GetChunks(10, 40).ToList();
// If we can't find a cache then there's no data to upgrade with.
var nrdoCache = desired.State.FindOldVersionNrdoCache(chunks[0].Start());
if (nrdoCache == null)
{
return;
}
// This line serves no purpose except to cause changes to notice that this step did something and so needs to be included in the output.
changes.Put(null);
var total = nrdoCache.Entries.Count;
using (var steps = chunks[1].ProgressBlock(total))
{
output.Message("Migration: Processing " + total + " tables and queries...");
foreach (var entry in nrdoCache.Entries)
{
var cacheLine = SmeltFile.Parse(entry.Content).Lines.Single();
var obsoleteVersionSpec = cacheLine.GetString(0);
var type = cacheLine.GetString(1);
var name = cacheLine.GetString(2);
if (obsoleteVersionSpec != "")
{
throw new ApplicationException("Unexpected value " + obsoleteVersionSpec + " found in obsolete version spec space");
}
if (name != entry.Name)
{
throw new ApplicationException("Name in cache entry does not match file name: " + name + " vs " + entry.Name);
}
if (type == "tcache")
{
output.Verbose("Migration: Table " + name + "...");
// Table cache structure is either
//[] tcache name existing { beforestatement beforestatement ... ; };
// OR
//[] tcache name {
// fieldname sqltype nullable|notnull identity? ;
// ...
//} {
// pk|uk|ix indexname { fieldname; fieldname; ... } ;
// ...
//} {
// fkeyname desttable { fromfield tofield; fromfield tofield; ... } cascade? ;
// ...
//} {
// sequencename ;
// triggername ;
// beforestatement beforestatement ... ;
//};
if (cacheLine.Words[3] is SmeltString)
{
if (cacheLine.GetString(3) != "existing")
{
throw new ApplicationException("Unexpected word '" + cacheLine.GetString(3) + "' in " + name);
}
var beforeStatements = cacheLine.GetBlock(4).Lines.Single();
if (beforeStatements.Words.Any())
{
throw new ApplicationException("Table " + name + " was 'existing' but has before statements, which is no longer supported");
}
// In the old world "existing" tables could have before statements, but we can't do that any more
}
else
{
var table = TableType.Identifier(name);
storage.PutRoot(table);
foreach (var fieldLine in cacheLine.GetBlock(3).Lines)
{
storage.PutSub(table, FieldType.Identifier(fieldLine.GetString(0)));
// We don't care about type, nullability or identity any more because we can get all that from the database schema directly
}
foreach (var ixLine in cacheLine.GetBlock(4).Lines)
{
var ixTypeStr = ixLine.GetString(0);
ObjectType ixType;
switch (ixTypeStr)
{
case "ix": ixType = NonUniqueIndexType.Instance; break;
case "pk":
case "uk": ixType = UniqueIndexType.Instance; break;
default: throw new ApplicationException("Unexpected index type " + ixTypeStr + " in " + name);
}
storage.PutSub(table, ixType.Identifier(ixLine.GetString(1)));
}
foreach (var fkLine in cacheLine.GetBlock(5).Lines)
{
storage.PutSub(table, FkeyType.Identifier(fkLine.GetString(0)));
}
var others = cacheLine.GetBlock(6);
var seqInfo = others.Lines[0];
if (seqInfo.Words.Count > 1 && changes.SchemaDriver.IsSequenceUsed)
{
storage.PutSub(table, SequenceType.Identifier("dbo." + seqInfo.GetString(1)));
}
if (seqInfo.Words.Count > 2 && changes.SchemaDriver.IsTriggerUsedForSequence)
{
storage.PutSub(table, TriggerType.Identifier("dbo." + seqInfo.GetString(2)));
}
if (others.Lines.Count > 1)
{
foreach (var beforeStatement in others.Lines[1].Words.Cast <SmeltString>())
{
storage.PutSub(table, BeforeStatementType.Identifier(beforeStatement.Text));
}
}
}
}
else
{
output.Verbose("Migration: Query " + name);
// Query cache file structure is
// [] spcache name [] { beforestatement beforestatement ... ; };
// OR
// [] spcache|sfcache|spcache-preupgrade name [sql] { beforestatement beforestatement ... ; }
var isPreUpgradeHook = false;
switch (type)
{
case "spcache":
case "sfcache": break;
case "spcache-preupgrade": isPreUpgradeHook = true; break;
default: throw new ApplicationException("Unknown type of cache entry '" + type + "' in " + name);
}
var query = QueryType.Identifier(name);
storage.PutRoot(query);
if (isPreUpgradeHook)
{
storage.PutSub(query, PreUpgradeHookType.Create(query).Identifier);
}
foreach (var beforeStatement in cacheLine.GetBlock(4).Lines.Single().Words.Cast <SmeltString>())
{
storage.PutSub(query, BeforeStatementType.Identifier(beforeStatement.Text));
}
}
steps.Step++;
}
if (nrdoCache.IsComplete)
{
storage.PutRoot(CompletionType.Create().Identifier);
}
storage.PutRoot(desired.Identifier);
output.Message("Migration: Complete.");
}
}
}