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：
- backup database db_CSManage to disk=‘c:\backup.bak‘
- 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);
-
- }
- }
- 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();
-
-
- 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();
- 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
