昨天看了《C#项目实录》中的进销存管理系统,和其他书里讲的案例一样,无非也就是数据库增删查改,但是这个进销存系统中有一个备份和还原数据库的功能,蛮有兴趣的,看了一下代码,原来如此,也就是通过SQL语句来进行备份和还原数据库,SQL语句如下:
- -- 备份数据库
- backup database db_CSManage to disk='c:\backup.bak'
- -- 还原数据库,必须先备份该数据库的日志文件到原先的备份文件中
- backup log db_CSManage to disk='c:\backup.bak'
- restore database db_CSManage from disk='c:\backup.bak'
其中db_CSManage是数据库名称,disk后的路径即是备份文件存储的路径。
知道了SQL语句,那么在.NET代码中就容易多了,备份的.NET代码如下:
- try
- {
- if (txtPath.Text != "" && txtName122.Text != "")
- {
- getSqlConnection geCon = new getSqlConnection();
- SqlConnection con = geCon.GetCon();
- string strBacl = "backup database db_CSManage to disk='" + txtPath.Text.Trim() + "\\" + txtName.Text.Trim() + ".bak'";
- SqlCommand Cmd = new SqlCommand(strBacl, con);
- if (Cmd.ExecuteNonQuery() != 0)
- {
- MessageBox.Show("数据备份成功!", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);
- this.Close();
- }
- else
- {
- MessageBox.Show("数据备份失败!", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);
- }
- }
- else
- {
- MessageBox.Show("请填写备份的正确位置及文件名!", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);
- }// end
- }
- catch (Exception ee)
- {
- MessageBox.Show(ee.Message.ToString());
- }
以下是还原数据库的代码,在示例中发现开头得先删除与该数据库相关的进程,然后在还原之前得先把数据库日志备份到开始的备份文件中,然后才还原备份文件,要不然会出错的,代码如下:
- if (textPaht.Text != "")
- {
- getSqlConnection geCon = new getSqlConnection();
- SqlConnection con = geCon.GetCon();
- if (con.State == ConnectionState.Open)
- {
- con.Close();
- }
- string DateStr = "Data Source=niunan\\sqlexpress;Database=master;User id=sa;PWD=123456";
- SqlConnection conn = new SqlConnection(DateStr);
- conn.Open();
- //-------------------杀掉所有连接 db_CSManage 数据库的进程--------------
- string strSQL = "select spid from master..sysprocesses where dbid=db_id( 'db_CSManage') ";
- SqlDataAdapter Da = new SqlDataAdapter(strSQL, conn);
- DataTable spidTable = new DataTable();
- Da.Fill(spidTable);
- SqlCommand Cmd = new SqlCommand();
- Cmd.CommandType = CommandType.Text;
- Cmd.Connection = conn;
- for (int iRow = 0; iRow <= spidTable.Rows.Count - 1; iRow++)
- {
- Cmd.CommandText = "kill " + spidTable.Rows[iRow][0].ToString(); //强行关闭用户进程
- Cmd.ExecuteNonQuery();
- }
- conn.Close();
- conn.Dispose();
- //--------------------------------------------------------------------
- SqlConnection sqlcon = new SqlConnection(DateStr);
- sqlcon.Open();
- string sql = "backup log db_CSManage to disk='" + textPaht.Text.Trim() + "' restore database db_CSManage from disk='" + textPaht.Text.Trim() + "'";
- SqlCommand sqlCmd = new SqlCommand(sql, sqlcon);
- sqlCmd.ExecuteNonQuery();
- sqlCmd.Dispose();
- sqlcon.Close();
- sqlcon.Dispose();
- MessageBox.Show("数据还原成功!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
- MessageBox.Show("为了必免数据丢失,在数据库还原后将关闭整个系统。");
- Application.Exit();
- }
- else
- {
- MessageBox.Show("请选择备份文件!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
- }
附上整个进销存系统的源码
- 08.rar (5.8 MB)