public static void Attach(ManagedConnection db, string path, string alias)
{
var commandText = $"attach @path as {alias};";
using (var statement = db.PrepareStatement(commandText))
{
statement.TryBind("@path", path);
statement.MoveNext();
}
}
protected ManagedConnection CreateConnection(bool isReadOnly = false)
{
if (_connection != null)
{
return(_connection);
}
lock (WriteLock)
{
if (!_versionLogged)
{
_versionLogged = true;
_logger.LogInformation("SQLite version: {Version}", SQLite3.Version);
_logger.LogInformation("SQLite compiler options: {Options}", string.Join(',', SQLite3.CompilerOptions));
}
ConnectionFlags connectionFlags;
if (isReadOnly)
{
// TODO: set connection flags correctly
// connectionFlags = ConnectionFlags.ReadOnly
_logger.LogDebug("Opening read connection to database");
connectionFlags = ConnectionFlags.Create;
connectionFlags |= ConnectionFlags.ReadWrite;
}
else
{
_logger.LogDebug("Opening write connection to database.");
connectionFlags = ConnectionFlags.Create;
connectionFlags |= ConnectionFlags.ReadWrite;
}
if (EnableSingleConnection)
{
connectionFlags |= ConnectionFlags.PrivateCache;
}
else
{
connectionFlags |= ConnectionFlags.SharedCached;
}
connectionFlags |= ConnectionFlags.NoMutex;
var db = SQLite3.Open(DbFilePath, connectionFlags, null);
try
{
if (string.IsNullOrWhiteSpace(_defaultWal))
{
_defaultWal = db.Query("PRAGMA journal_mode").SelectScalarString().First();
_logger.LogInformation("Default journal_mode for {0} is {1}", DbFilePath, _defaultWal);
}
var queries = new List <string>
{
// "PRAGMA cache size=-10000"
// "PRAGMA read_uncommitted = true",
"PRAGMA synchronous=Normal"
};
if (CacheSize.HasValue)
{
queries.Add("PRAGMA cache_size=" + CacheSize.Value.ToString(CultureInfo.InvariantCulture));
}
if (EnableTempStoreMemory)
{
queries.Add("PRAGMA temp_store = memory");
}
else
{
queries.Add("PRAGMA temp_store = file");
}
db.ExecuteAll(string.Join(';', queries));
}
catch
{
db.Dispose();
throw;
}
_dbConnection = db;
_connection = new ManagedConnection(db);
return(_connection);
}
}
protected bool TableExists(ManagedConnection connection, string name)
{
return(connection.RunInTransaction(db => TableExists(db, name), ReadTransactionMode));
}
public IStatement PrepareStatementSafe(ManagedConnection connection, string sql)
{
return(connection.PrepareStatement(sql));
}
