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using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Model.Logging;
using SQLitePCL.pretty;
using System.Linq;
namespace Emby.Server.Implementations.Data
{
public abstract class BaseSqliteRepository : IDisposable
{
protected string DbFilePath { get; set; }
protected SemaphoreSlim WriteLock = new SemaphoreSlim(1, 1);
protected ILogger Logger { get; private set; }
protected BaseSqliteRepository(ILogger logger)
{
Logger = logger;
}
protected virtual bool EnableConnectionPooling
{
get { return true; }
}
protected virtual SQLiteDatabaseConnection CreateConnection(bool isReadOnly = false)
{
SQLite3.EnableSharedCache = false;
ConnectionFlags connectionFlags;
if (isReadOnly)
{
connectionFlags = ConnectionFlags.ReadOnly;
//connectionFlags = ConnectionFlags.Create;
//connectionFlags |= ConnectionFlags.ReadWrite;
}
else
{
connectionFlags = ConnectionFlags.Create;
connectionFlags |= ConnectionFlags.ReadWrite;
}
if (EnableConnectionPooling)
{
connectionFlags |= ConnectionFlags.SharedCached;
}
else
{
connectionFlags |= ConnectionFlags.PrivateCache;
}
connectionFlags |= ConnectionFlags.NoMutex;
var db = SQLite3.Open(DbFilePath, connectionFlags, null);
var queries = new[]
{
"PRAGMA page_size=4096",
"PRAGMA journal_mode=WAL",
"PRAGMA temp_store=memory",
"PRAGMA synchronous=Normal",
//"PRAGMA cache size=-10000"
};
//foreach (var query in queries)
//{
// db.Execute(query);
//}
db.ExecuteAll(string.Join(";", queries));
return db;
}
private bool _disposed;
protected void CheckDisposed()
{
if (_disposed)
{
throw new ObjectDisposedException(GetType().Name + " has been disposed and cannot be accessed.");
}
}
public void Dispose()
{
_disposed = true;
Dispose(true);
GC.SuppressFinalize(this);
}
private readonly object _disposeLock = new object();
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool dispose)
{
if (dispose)
{
try
{
lock (_disposeLock)
{
WriteLock.Wait();
CloseConnection();
}
}
catch (Exception ex)
{
Logger.ErrorException("Error disposing database", ex);
}
}
}
protected virtual void CloseConnection()
{
}
protected List<string> GetColumnNames(IDatabaseConnection connection, string table)
{
var list = new List<string>();
foreach (var row in connection.Query("PRAGMA table_info(" + table + ")"))
{
if (row[1].SQLiteType != SQLiteType.Null)
{
var name = row[1].ToString();
list.Add(name);
}
}
return list;
}
protected void AddColumn(IDatabaseConnection connection, string table, string columnName, string type, List<string> existingColumnNames)
{
if (existingColumnNames.Contains(columnName, StringComparer.OrdinalIgnoreCase))
{
return;
}
connection.ExecuteAll(string.Join(";", new string[]
{
"alter table " + table,
"add column " + columnName + " " + type + " NULL"
}));
}
}
}
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