/// <exception cref="Couchbase.Lite.Storage.SQLException"></exception>
public static byte[] ByteArrayResultForQuery(SQLiteStorageEngine database, string
query, string[] args)
{
byte[] result = null;
Cursor cursor = database.RawQuery(query, args);
if (cursor.MoveToNext())
{
result = cursor.GetBlob(0);
}
return result;
}
public static SQLiteStorageEngine CreateStorageEngine()
{
string classname = string.Empty;
string resource = "services/com.couchbase.lite.storage.SQLiteStorageEngine";
try
{
InputStream inputStream = Sharpen.Thread.CurrentThread().GetContextClassLoader().
GetResourceAsStream(resource);
byte[] bytes = TextUtils.Read(inputStream);
classname = Sharpen.Runtime.GetStringForBytes(bytes);
Log.D(Database.Tag, "Loading storage engine: %s", classname);
Type clazz = Sharpen.Runtime.GetType(classname);
SQLiteStorageEngine storageEngine = (SQLiteStorageEngine)System.Activator.CreateInstance
(clazz);
return(storageEngine);
}
catch (Exception e)
{
throw new RuntimeException("Failed to load storage. Resource: " + resource + " classname: "
+ classname, e);
}
}
public bool Open()
{
if (open)
{
return true;
}
// Create the storage engine.
database = SQLiteStorageEngineFactory.CreateStorageEngine();
// Try to open the storage engine and stop if we fail.
if (database == null || !database.Open(path))
{
string msg = "Unable to create a storage engine, fatal error";
Log.E(Database.Tag, msg);
throw new InvalidOperationException(msg);
}
// Stuff we need to initialize every time the sqliteDb opens:
if (!Initialize("PRAGMA foreign_keys = ON;"))
{
Log.E(Database.Tag, "Error turning on foreign keys");
return false;
}
// Check the user_version number we last stored in the sqliteDb:
int dbVersion = database.GetVersion();
// Incompatible version changes increment the hundreds' place:
if (dbVersion >= 100)
{
Log.W(Database.Tag, "Database: Database version (" + dbVersion + ") is newer than I know how to work with"
);
database.Close();
return false;
}
if (dbVersion < 1)
{
// First-time initialization:
// (Note: Declaring revs.sequence as AUTOINCREMENT means the values will always be
// monotonically increasing, never reused. See <http://www.sqlite.org/autoinc.html>)
if (!Initialize(Schema))
{
database.Close();
return false;
}
dbVersion = 3;
}
if (dbVersion < 2)
{
// Version 2: added attachments.revpos
string upgradeSql = "ALTER TABLE attachments ADD COLUMN revpos INTEGER DEFAULT 0; "
+ "PRAGMA user_version = 2";
if (!Initialize(upgradeSql))
{
database.Close();
return false;
}
dbVersion = 2;
}
if (dbVersion < 3)
{
string upgradeSql = "CREATE TABLE localdocs ( " + "docid TEXT UNIQUE NOT NULL, "
+ "revid TEXT NOT NULL, " + "json BLOB); " + "CREATE INDEX localdocs_by_docid ON localdocs(docid); "
+ "PRAGMA user_version = 3";
if (!Initialize(upgradeSql))
{
database.Close();
return false;
}
dbVersion = 3;
}
if (dbVersion < 4)
{
string upgradeSql = "CREATE TABLE info ( " + "key TEXT PRIMARY KEY, " + "value TEXT); "
+ "INSERT INTO INFO (key, value) VALUES ('privateUUID', '" + Misc.TDCreateUUID(
) + "'); " + "INSERT INTO INFO (key, value) VALUES ('publicUUID', '" + Misc.TDCreateUUID
() + "'); " + "PRAGMA user_version = 4";
if (!Initialize(upgradeSql))
{
database.Close();
return false;
}
}
try
{
attachments = new BlobStore(GetAttachmentStorePath());
}
catch (ArgumentException e)
{
Log.E(Database.Tag, "Could not initialize attachment store", e);
database.Close();
return false;
}
open = true;
return true;
}
