如何在不使用 SMO 的情况下在 C# 中备份数据库（SQL Server 2008）？

Question

我有这段代码，但它不工作，但我不知道为什么？

try
{
   saveFileDialog1.Filter = "SQL Server database backup files|*.bak";
   saveFileDialog1.Title = "Database Backup";

   if (saveFileDialog1.ShowDialog() == DialogResult.OK)
   {
      SqlCommand bu2 = new SqlCommand();
      SqlConnection s = new SqlConnection("Data Source=M1-PC;Initial Catalog=master;Integrated Security=True;Pooling=False");

      bu2.CommandText = String.Format("BACKUP DATABASE LA TO DISK='{0}'", saveFileDialog1.FileName);

      s.Open();

      bu2.ExecuteNonQuery();
      s.Close();

      MessageBox.Show("ok");
   }
}
catch (Exception ex)
{
   MessageBox.Show(ex.ToString());
}

我得到了这个错误：

有什么问题？

Answer 1

您需要将该 SqlConnection 对象分配给 SqlCommand - 试试这个代码：

if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
    string connStr = "Data Source=M1-PC;Initial Catalog=master;Integrated Security=True;Pooling=False";

    using(SqlConnection conn = new SqlConnection(connStr))
    {
       string sqlStmt = String.Format("BACKUP DATABASE LA TO DISK='{0}'", saveFileDialog1.FileName);

       using(SqlCommand bu2 = new SqlCommand(sqlStmt, conn))
       {
           conn.Open();
           bu2.ExecuteNonQuery();
           conn.Close();

           MessageBox.Show("ok");
       }
    }
}

Answer 2

你从来没有告诉你的 SqlCommand 使用哪个连接（顺便说一下，这是错误消息所说的，你读过吗？）。首先设置Connection 属性或使用SqlConnection.CreateCommand 创建命令。

Answer 3

用 C# 备份 Sql Server 2008 数据库（100% 正确）

using System.Data.SqlClient;
try{
    SqlConnection con = new SqlConnection(cs.conn()); 
    string database = con.Database.ToString(); 
    string datasource = con.DataSource.ToString(); 
    string connection = con.ConnectionString.ToString(); 
    string file_name =data_loaction+database_name;
    --- "D:\\Hotel BackUp\\" + database + day + month + year + hour + minute + second + ms + ".bak";

    con.Close();
    con.Open();                

    string str = "Backup Database  [" + database + "] To Disk =N'" + file_name + "'";// With Format;' + char(13),'') From  Master..Sysdatabases  Where [Name] Not In ('tempdb','master','model','msdb') and databasepropertyex ([Name],'Status') = 'online'";

    SqlCommand cmd1 = new SqlCommand(str, con);
    int s1 = cmd1.ExecuteNonQuery();
    con.Close();               
    if (s1 >= -1)
            MessageBox.Show("Database Backup Sucessfull.", "Hotel Management", MessageBoxButtons.OK, MessageBoxIcon.Information);
    else{
            MessageBox.Show("Database Backup Not Sucessfull.", "Hotel Management", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
}