数据库备份或恢复仅在我放置 |DataDirectory| 时有效连接字符串到 app.config

Question

我正在使用 visual studio 2012 服务基础数据库。我认为它是备份，因为我看到了一个 .BAK 文件，但是当我恢复时，它不起作用。两者在运行时都没有错误，但我认为我的代码有问题。这是我的代码：

private void btnBackUp_Click(object sender, EventArgs e)           
    {
        try
        {
            progressBar1.Visible = true;
            progressBar1.Value = 15;
            bool bBackUpStatus = true;

            Cursor.Current = Cursors.WaitCursor;

            if (Directory.Exists(@"D:\Backup_MAConvent"))
            {
                if (File.Exists(@"D:\Backup_MAConvent\MAConvent_Backup.bak"))
                {
                    if (MessageBox.Show(@"Do you want to replace it?", "Back", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                    {
                        File.Delete(@"D:\Backup_MAConvent\MAConvent_Backup.bak");
                    }
                    else
                        bBackUpStatus = false;
                }
            }
            else
                Directory.CreateDirectory(@"D:\Backup_MAConvent");

            if (bBackUpStatus)
            {


                con.Open();

                progressBar1.Value = 25;

                string path1 = System.IO.Path.GetFullPath(@"SchoolDatabase.mdf");

                SqlCommand cmd2 = new SqlCommand("backup database [" + path1 + @"] to disk ='D:\Backup_MAConvent\MAConvent_Backup.bak' with init,stats=10", con);
                cmd2.ExecuteNonQuery();

                progressBar1.Value = 35;
                con.Close();

                timer1.Start();

                MessageBox.Show("Backup of the Database saved Successfully", "Back", MessageBoxButtons.OK, MessageBoxIcon.Information);
                timer1.Stop();
                progressBar1.Value = 10;
                progressBar1.Visible = false;
            }
        }
        catch
        {
            MessageBox.Show(@"Backup Error, Please close the software & restart and then try again to backup", "Backup", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }

    private void btnRestore_Click(object sender, EventArgs e)
    {
        Cursor.Current = Cursors.WaitCursor;
        progressBar1.Visible = true;
        progressBar1.Value = 15;

        try
        {
            if (File.Exists(@"D:\Backup_MAConvent\MAConvent_Backup.bak"))
            {
                if (MessageBox.Show("Are you sure you restore?", "Back", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    con.Open();
                    progressBar1.Value = 25;
                    SqlCommand cmd;
                    cmd = new SqlCommand("use master", con);
                    cmd.ExecuteNonQuery();
                    progressBar1.Value = 35;
                    string path1 = System.IO.Path.GetFullPath(@"SchoolDatabase.mdf");
                    cmd = new SqlCommand("restore database [" + path1 + @"] from disk = 'D:\Backup_MAConvent\MAConvent_Backup.bak'", con);
                    cmd.ExecuteNonQuery();
                    con.Close();
                    timer1.Start();
                    MessageBox.Show("Database has been Restored", "Restoration", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    timer1.Stop();
                    progressBar1.Value = 10;
                    progressBar1.Visible = false;
                }
            }
            else
            {
                MessageBox.Show(@"This is not in the correct path, Please close the software & restart and then try again to restore", "Restoration", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }

        }
        catch (Exception exp)
        {
            MessageBox.Show(exp.Message);
        }
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        try
        {
            progressBar1.Value = 50;
            progressBar1.PerformStep();
            if (progressBar1.Value <= progressBar1.Maximum)
                timer1.Stop();

            progressBar1.Value = progressBar1.Maximum;
        }
        catch
        {
        }
    }

下面是我的连接字符串：

<configSections>
</configSections>
<connectionStrings>
    <add name="SchoolManagement.Properties.Settings.SchoolDatabaseConnectionString"
        connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=G:\Users\ARORAS\documents\visual studio 2012\Projects\SchoolManagement\SchoolManagement\SchoolDatabase.mdf;Integrated Security=True;User Instance=True"
        providerName="System.Data.SqlClient" />
</connectionStrings>
<startup useLegacyV2RuntimeActivationPolicy="true"> 
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
</startup>

但是当我将连接字符串更改为 |DataDirectory| 时备份和恢复都正常工作。如下

connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\SchoolDatabase.mdf;Integrated Security=True;User Instance=True"

但我不想使用 |DataDirectory|细绳。请建议在备份和恢复代码中更改什么？请帮忙提前致谢

Answer 1

我自己找到了答案。如果将来有人遇到同样的问题，我会在这里提供答案。值得注意的是，一个项目中有 2 个数据库，即一个数据库是主应用程序目录数据库，另一个是输出数据库。当我们开始调试时，主数据库通常将所有表及其数据复制到输出目录数据库中 \bin\Debug\database.mdf。因此，如果我们在连接字符串中使用 |DataDirectory|，备份将完美运行，但这不是一个好方法，因为通过这样做我们将所有数据恢复到仅用于输出的 \bin 数据库中。因此，我们应该提供完整的连接字符串，如下所示：

<connectionStrings>
    <add name="SchoolManagement.Properties.Settings.SchoolDatabaseConnectionString"
        connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=G:\Users\ABC\documents\visual studio 2012\Projects\SchoolManagement\SchoolManagement\SchoolDatabase.mdf;Integrated Security=True;User Instance=True"
        providerName="System.Data.SqlClient" />
</connectionStrings>

请记住，这是用于 VS 服务基础数据库连接字符串。而且我们必须在备份表单的路径字符串中写入主数据库的完整路径。见下文：

string path1 = System.IO.Path.GetFullPath(@"G:\Users\ABC\documents\visual studio 2012\Projects\SchoolManagement\SchoolManagement\SchoolDatabase.mdf");
SqlCommand cmd2 = new SqlCommand("backup database [" + path1 + @"] to disk ='D:\Backup_MAConvent\MAConvent_Backup.bak' with init,stats=10", con);
cmd2.ExecuteNonQuery();

数据库备份或恢复仅在我放置 |DataDirectory| 时有效连接字符串到 app.config

Database backup or restore working only when I place |DataDirectory| connection string into app.config

c#

database

sql-server

database-backups