data: Store separate storage version number in SqliteStorage for managing migrations

* deprecated the third version number as storage update number
* version can now have either 3 or 4 numbers
* whether a .coatidb file is outdated is now solely determined by the SqliteStorage::STORAGE_VERSION

src/lib/data/PersistentStorage.cpp

@@ -238,14 +238,19 @@ FilePath PersistentStorage::getDbFilePath() const
 	return m_sqliteStorage.getDbFilePath();
 }
 
-Version PersistentStorage::getVersion() const
+bool PersistentStorage::isEmpty() const
 {
-	return m_sqliteStorage.getVersion();
+	return m_sqliteStorage.isEmpty();
 }
 
-void PersistentStorage::init()
+bool PersistentStorage::isIncompatible() const
 {
-	m_sqliteStorage.init();
+	return m_sqliteStorage.isIncompatible();
+}
+
+void PersistentStorage::setup()
+{
+	m_sqliteStorage.setup();
 }
 
 void PersistentStorage::clear()
@@ -365,7 +370,7 @@ void PersistentStorage::startParsing()
 {
 	MessageClearErrorCount().dispatch();
 
-	m_sqliteStorage.setVersion(Version::getApplicationVersion());
+	m_sqliteStorage.setVersion();
 }
 
 void PersistentStorage::finishParsing()

src/lib/data/PersistentStorage.h

@@ -49,9 +49,11 @@ public:
 	virtual void finishInjection();
 
 	FilePath getDbFilePath() const;
-	Version getVersion() const;
 
-	void init();
+	bool isEmpty() const;
+	bool isIncompatible() const;
+
+	void setup();
 	void clear();
 	void clearCaches();
 

src/lib/data/SqliteStorage.cpp

@@ -11,6 +11,8 @@
 #include "utility/utilityString.h"
 #include "utility/Version.h"
 
+const size_t SqliteStorage::STORAGE_VERSION = 1;
+
 SqliteStorage::SqliteStorage(const FilePath& dbFilePath)
 	: m_dbFilePath(dbFilePath)
 {
@@ -31,20 +33,6 @@ SqliteStorage::~SqliteStorage()
 	}
 }
 
-void SqliteStorage::init()
-{
-	Version version = getVersion();
-
-	if (version.isEmpty())
-	{
-		setup();
-	}
-	else if (version.isDifferentStorageVersionThan(Version::getApplicationVersion()))
-	{
-		clear();
-	}
-}
-
 void SqliteStorage::setup()
 {
 	m_database.execDML("PRAGMA foreign_keys=ON;");
@@ -79,21 +67,33 @@ FilePath SqliteStorage::getDbFilePath() const
 	return m_dbFilePath;
 }
 
-Version SqliteStorage::getVersion() const
+bool SqliteStorage::isEmpty() const
 {
-	std::string versionStr = getMetaValue("version");
-
-	if (versionStr.size())
+	size_t storageVersion = getStorageVersion();
+	if (storageVersion > 0)
 	{
-		return Version::fromString(versionStr);
+		return false;
 	}
 
-	return Version();
+	Version applicationVersion = getApplicationVersion();
+	return applicationVersion.isEmpty();
 }
 
-void SqliteStorage::setVersion(const Version& version)
+bool SqliteStorage::isIncompatible() const
 {
-	insertOrUpdateMetaValue("version", version.toString());
+	size_t storageVersion = getStorageVersion();
+	if (storageVersion == 0 || storageVersion != STORAGE_VERSION)
+	{
+		return true;
+	}
+
+	return false;
+}
+
+void SqliteStorage::setVersion()
+{
+	setStorageVersion();
+	setApplicationVersion();
 }
 
 Id SqliteStorage::addEdge(int type, Id sourceNodeId, Id targetNodeId)
@@ -797,6 +797,40 @@ void SqliteStorage::insertOrUpdateMetaValue(const std::string& key, const std::s
 	).c_str());
 }
 
+size_t SqliteStorage::getStorageVersion() const
+{
+	std::string storageVersionStr = getMetaValue("storage_version");
+
+	if (storageVersionStr.size())
+	{
+		return std::stoi(storageVersionStr);
+	}
+
+	return 0;
+}
+
+void SqliteStorage::setStorageVersion()
+{
+	insertOrUpdateMetaValue("storage_version", std::to_string(STORAGE_VERSION));
+}
+
+Version SqliteStorage::getApplicationVersion() const
+{
+	std::string versionStr = getMetaValue("version");
+
+	if (versionStr.size())
+	{
+		return Version::fromString(versionStr);
+	}
+
+	return Version();
+}
+
+void SqliteStorage::setApplicationVersion()
+{
+	insertOrUpdateMetaValue("version", Version::getApplicationVersion().toString());
+}
+
 template <>
 std::vector<StorageFile> SqliteStorage::getAll<StorageFile>(const std::string& query) const
 {

src/lib/data/SqliteStorage.h

@@ -24,7 +24,6 @@ public:
 	SqliteStorage(const FilePath& dbFilePath);
 	~SqliteStorage();
 
-	void init();
 	void setup();
 	void clear();
 
@@ -34,8 +33,10 @@ public:
 
 	FilePath getDbFilePath() const;
 
-	Version getVersion() const;
-	void setVersion(const Version& version);
+	bool isEmpty() const;
+	bool isIncompatible() const;
+
+	void setVersion();
 
 	Id addEdge(int type, Id sourceNodeId, Id targetNodeId);
 	Id addNode(int type, const std::string& serializedName, int definitionType);
@@ -118,6 +119,8 @@ public:
 	int getSourceLocationCount() const;
 
 private:
+	static const size_t STORAGE_VERSION;
+
 	void clearTables();
 	void setupTables();
 
@@ -126,6 +129,12 @@ private:
 	std::string getMetaValue(const std::string& key) const;
 	void insertOrUpdateMetaValue(const std::string& key, const std::string& value);
 
+	size_t getStorageVersion() const;
+	void setStorageVersion();
+
+	Version getApplicationVersion() const;
+	void setApplicationVersion();
+
 	template <typename ResultType>
 	std::vector<ResultType> getAll(const std::string& query) const;