多个更新语句抛出“无法打开" [英] multiple update statements throw "cannot open"

问题描述

当我尝试在 WinRT 中 SQLite 的同一个事务中对同一个表进行多次更新时，出现无法打开"异常.

I am getting a "cannot open" exception when I try to do multiple updates on the same table in the same transaction on SQLite in WinRT.

我为此用例创建了一个示例应用程序.下面是代码，单击第一个按钮，我在事务中创建一个表，单击另一个按钮，我尝试第二次更新相同的记录.在那里，它会引发无法打开"异常.

I have created a sample application for this use case. Below is code where on clicking the first button, I am creating a table in a transaction, and on clicking the other button, I am trying to update the same record a second time. There, it throws a "cannot open" exception.

应用代码:

private SQLiteConnection getConnection()
{
    var connection = SQLiteConnectionPool.Shared.GetConnection(
                           new SQLiteConnectionString("sample.db", false));
    return connection;
}

private void Button_Click_1(object sender, RoutedEventArgs e)
{
    SQLiteConnection con = getConnection();
    con.BeginTransaction();
    {
        try
        {
            var command = new SQLiteCommand(con) {
                CommandText =
                    @"create table konysyncMETAINFO (
                        id bigint not null,
                        versionnumber int,
                        lastserversynccontext nvarchar(1000),
                        filtervalue nvarchar(1000),
                        replaysequencenumber integer,
                        lastgeneratedid integer,
                        scopename nvarchar(100),
                        primary key (id))"
            };
            var xyz = (double)command.ExecuteNonQuery();

            var command2 = new SQLiteCommand(con) {
                CommandText =
                    @"insert into konysyncMETAINFO
                        (id,scopename,versionnumber,lastserversynccontext,
                         replaysequencenumber,lastgeneratedid)
                      values ('1','testscope','0','','0','-1')"
            };
            var xyz2 = (double)command2.ExecuteNonQuery();

            var command3 = new SQLiteCommand(con) {
                CommandText =
                    @"insert into konysyncMETAINFO
                        (id,scopename,versionnumber,lastserversynccontext,
                         replaysequencenumber,lastgeneratedid)
                      values ('2','testscope2','0','','0','-1')"
            };
            var xyz3 = (double)command3.ExecuteNonQuery();
            con.Commit();
        }
        catch (Exception ex)
        {
            con.Rollback();
        }
    }
}

private void Button_Click_2(object sender, RoutedEventArgs e)
{
    SQLiteConnection con = getConnection();
    con.BeginTransaction();
    {
        try
        {
            var command = new SQLiteCommand(con) {
                CommandText =
                    @"Update konysyncMETAINFO
                      set lastgeneratedid='4'
                      WHERE scopename = 'testscope'"
            };
            var xyz = (double)command.ExecuteNonQuery();

            //var command2 = new SQLiteCommand(con) { CommandText = "insert into konysyncMETAINFO (id,scopename,versionnumber,lastserversynccontext,replaysequencenumber,lastgeneratedid) values ('3','testscope3','0','','0','-1')" };
            //var xyz2 = (double)command2.ExecuteNonQuery();

            var command3 = new SQLiteCommand(con) {
                CommandText =
                    @"Update konysyncMETAINFO 
                      set lastgeneratedid='3'
                      WHERE scopename = 'testscope'"
            };
            var xyz3 = (double)command3.ExecuteNonQuery();
            con.Commit();
        }
        catch (Exception ex)
        {
            con.Rollback();
        }
    }
}

推荐答案

您可能偶然发现了 我在 sqlite-net 中的错误.我已经创建了 一个修复，它已经被拉回到主分支中，但是从那时起，NuGet 上就没有新的发布.您可以直接下载最新源并检查它是否能解决您的问题.

You've probably stumbled across the same bug in sqlite-net that I have. I've created a fix which has already been pulled back into the main fork but there hasn't been a new release on NuGet since then. You could download the latest sources directly and check if it fixes your problem.

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