C# “接收”;“数据库已锁定”;SQLite和C出错#
以下是我正在使用的代码:C# “接收”;“数据库已锁定”;SQLite和C出错#,c#,sqlite,C#,Sqlite,以下是我正在使用的代码: public bool save(string name, string type, string city, string org) { BLL.maxkey maxkey = new BLL.maxkey(); int maxid = maxkey.getMaxKey(1); { SQLiteConnection sqConnection = new SQLiteConnect
public bool save(string name, string type, string city, string org)
{
BLL.maxkey maxkey = new BLL.maxkey();
int maxid = maxkey.getMaxKey(1);
{
SQLiteConnection sqConnection = new SQLiteConnection(@"Data Source= C:\Users\BigDaddyDuergar\Documents\Visual Studio 2012\Projects\MET Character Manager\MET Character Manager\METCMDB");
sqConnection.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.Connection = sqConnection;
SQLiteTransaction trans;
trans = sqConnection.BeginTransaction();
cmd.Transaction = trans;
int rows = 0;
try
{
cmd.CommandText = "insert into game values(@gameid, @gamename, @gametype, @gamecity, @gameorg)";
cmd.Parameters.AddWithValue("@gameid", maxid);
cmd.Parameters.AddWithValue("@gamename", name);
cmd.Parameters.AddWithValue("@gametype", type);
cmd.Parameters.AddWithValue("@gamecity", city);
cmd.Parameters.AddWithValue("@gameorg", org);
cmd.ExecuteNonQuery();
trans.Commit();
}
catch (Exception ex)
{
trans.Rollback();
error error = new error(ex);
}
finally
{
sqConnection.Close();
}
if (rows == 1)
{
return true;
}
else
{
return false;
}
}
}
而且:
public void updateMaxKey(int tablenum)
{
//using (var conn = new SQLiteConnection(@"Data Source= C:\Users\BigDaddyDuergar\Documents\Visual Studio 2012\Projects\MET Character Manager\MET Character Manager\METCMDB"))
//using (var cmd = conn.CreateCommand())
{
SQLiteConnection sqConnection = new SQLiteConnection(@"Data Source= C:\Users\BigDaddyDuergar\Documents\Visual Studio 2012\Projects\MET Character Manager\MET Character Manager\METCMDB");
sqConnection.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.Connection = sqConnection;
SQLiteTransaction trans;
trans = sqConnection.BeginTransaction();
cmd.Transaction = trans;
try
{
cmd.CommandText = "update maxnumkey set maxnum = (maxnum + 1) where tableid = @tableid";
cmd.Parameters.AddWithValue("@tableid", tablenum);
cmd.ExecuteNonQuery();
trans.Commit();
}
catch (Exception ex)
{
trans.Rollback();
error error = new error(ex);
}
finally
{
sqConnection.Close();
}
}
}
public int returnMaxKey(int tablenum)
{
int maxrows = 0;
{
SQLiteConnection sqConnection = new SQLiteConnection(@"Data Source= C:\Users\BigDaddyDuergar\Documents\Visual Studio 2012\Projects\MET Character Manager\MET Character Manager\METCMDB");
sqConnection.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.Connection = sqConnection;
SQLiteTransaction trans;
trans = sqConnection.BeginTransaction();
cmd.Transaction = trans;
try
{
cmd.CommandText = "select maxnum from maxnumkey where tableid = @tableid";
cmd.Parameters.AddWithValue("@tableid", tablenum);
SQLiteDataReader sqReader = cmd.ExecuteReader();
sqReader.Read();
maxrows = sqReader.GetInt32(0);
trans.Commit();
}
catch (Exception ex)
{
trans.Rollback();
error error = new error(ex);
}
finally
{
sqConnection.Close();
}
if (maxrows > 0)
{
return maxrows;
}
else
{
return -1;
}
}
}
我可以运行updatemaxkey函数,然后运行returnmaxkey函数,没有错误。我在数据库中验证更新是否正确处理,以及返回的信息是否匹配。我尝试进入SAVE函数,在trans.Commit()上,我得到一个“Database is locked”错误
我似乎在任何地方都找不到任何关于这一点的详细说明,也找不到任何关于如何缓解这一问题的方向
如果您需要任何进一步的澄清,请询问。我大约12小时前才开始使用sqlite,所以我希望它是我忽略的简单的东西
谢谢 Basic.NET:
- 处置一次性物品。命令、连接就是这样
- 使用“using”语句最容易做到这一点。杀死一半的代码
- 这对于事务来说绝对至关重要
没有什么是特定于SqlCe的-您的C#代码违反了核心.NET原则。好的,我使用的是using命令,但我不再使用了。我有点被这搞糊涂了。为了解决这个问题,我需要更改或查看什么?我更新了代码以使用下面建议的“using”命令,现在在使用块之后有了gc.collect(),但仍然存在问题。不确定如何获得db文件的发布。好的,我发现了我的问题。我打开阅读器开始读取数据,但从未关闭过。其他一切都很好。