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   源码介绍

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C#操作Sql数据库的例子

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace BackupSql
{
    public partial class DBTools : Form
    {
        private static DBTools _Instance = null;

        public static DBTools Instance()
        {
            if (_Instance == null)
            {
                _Instance = new DBTools();
            }
            else
            {
                MessageBox.Show("已经有一个实例在运行！");
            }
            return _Instance;
        }


        public DBTools()
        {
            InitializeComponent();
        }

        private void GetSQLServerList()
        {
            //get all available SQL Servers    
            SQLDMO._Application sqlApp = new SQLDMO.ApplicationClass();
            SQLDMO.NameList sqlServers = sqlApp.ListAvailableSQLServers();

            for (int i = 0; i < sqlServers.Count; i  )
            {
                object srv = sqlServers.Item(i   1);
                if (srv != null)
                {
                    this.cboServers.Items.Add(srv);
                }
            }

            if (this.cboServers.Items.Count > 0)
                this.cboServers.SelectedIndex = 0;
            else
                this.cboServers.Text = "<No available SQL Servers>";

        }

        private void GetBackUpDB()
        {
            SQLDMO.Application sqlApp = new SQLDMO.ApplicationClass();
            SQLDMO.SQLServer srv = new SQLDMO.SQLServer();
            srv.Connect(this.cboServers.Text.Trim(), this.txtUserName.Text.Trim(), this.txtPassword.Text.Trim());
           
            foreach (SQLDMO.Database db in srv.Databases)
            {
                if (db.Name != null)
                    this.cboDatabase.Items.Add(db.Name);
            }
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("欢迎使用数据库备份、还原工具，本工具将协助你备份和还原数据库，确保数据安全!", "备份您的数据库");
        }

        private void BackUpDB()
        {

            string selfName = this.txtSavePath.Text.Trim()   this.cboDatabase.Text.Trim()   "_"   System.DateTime.Now.ToString("yyyy-MM-dd_HHmm")   "[" cboServers.Text.Trim() "]" ".DAT";
            string deviceName = this.cboDatabase.Text.Trim()   "bak";
            string remark = "数据备份";

            //BACKUP DB
            SQLDMO.Backup oBackup = new SQLDMO.BackupClass();
            SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
            oBackup.Action = 0;
            oBackup.Initialize = true;
            SQLDMO.BackupSink_PercentCompleteEventHandler pceh = new SQLDMO.BackupSink_PercentCompleteEventHandler(Step);
            oBackup.PercentComplete  = pceh;
            try
            {
                oSQLServer.LoginSecure = false;
                oSQLServer.Connect(this.cboServers.Text.Trim(), this.txtUserName.Text.Trim(), this.txtPassword.Text.Trim());
                oBackup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;
                oBackup.Database = this.cboDatabase.Text.Trim();//数据库名
                oBackup.Files = selfName;//文件路径
                oBackup.BackupSetName = deviceName;//备份名称
                oBackup.BackupSetDescription = remark;//备份描述
                oBackup.Initialize = true;
                oBackup.SQLBackup(oSQLServer);

            }
            catch (System.Exception ex)
            {
                MessageBox.Show("数据备份失败："   ex.ToString());
            }
            finally
            {
                oSQLServer.DisConnect();
            }
        }
        private void Step(string message, int percent)
        {
            this.progressBar1.Value = percent;
        }
        private void button2_Click(object sender, EventArgs e)
        {
            this.Cursor = Cursors.WaitCursor;
            this.label6.Visible = true;
            this.progressBar1.Visible = true;
            this.BackUpDB();
            this.Cursor = Cursors.Default;
            this.label6.Text = "备份已完成!";
        }

        public void RestoreDB()
        {
            string filePath = this.txtBackUpFile.Text.Trim();
            SQLDMO.Restore oRestore = new SQLDMO.RestoreClass();
            SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
            oRestore.Action = 0;
            SQLDMO.RestoreSink_PercentCompleteEventHandler pceh = new SQLDMO.RestoreSink_PercentCompleteEventHandler(Step);
            oRestore.PercentComplete  = pceh;
            try
            {
                oSQLServer.Connect(this.cboServers.Text.Trim(), this.txtUserName.Text.Trim(), this.txtPassword.Text.Trim());
                SQLDMO.QueryResults qr = oSQLServer.EnumProcesses(-1);
                int iColPIDNum = -1;
                int iColDbName = -1;
                //杀死其它的连接进程

                for (int i = 1; i <= qr.Columns; i  )
                {
                    string strName = qr.get_ColumnName(i);
                    if (strName.ToUpper().Trim() == "SPID")
                    {
                        iColPIDNum = i;
                    }
                    else if (strName.ToUpper().Trim() == "DBNAME")
                    {
                        iColDbName = i;
                    }
                    if (iColPIDNum != -1 && iColDbName != -1)
                        break;
                }
                for (int i = 1; i <= qr.Rows; i  )
                {
                    int lPID = qr.GetColumnLong(i, iColPIDNum);
                    string strDBName = qr.GetColumnString(i, iColDbName);
                    if (strDBName.ToUpper() == "CgRecord".ToUpper())
                        oSQLServer.KillProcess(lPID);
                }

                oRestore.Action = SQLDMO.SQLDMO_RESTORE_TYPE.SQLDMORestore_Database;
                oRestore.Database = this.cboDBtoBackup.Text;
                oRestore.Files = filePath;
                oRestore.FileNumber = 1;
                oRestore.ReplaceDatabase = true;
                oRestore.SQLRestore(oSQLServer);

            }
            catch (System.Exception ex)
            {
                MessageBox.Show("数据还原失败："   ex.ToString());
            }
            finally
            {
                oSQLServer.DisConnect();
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.folderBrowserDialog1.Description = "请选择备份文件存放目录";
            this.folderBrowserDialog1.ShowNewFolderButton = true;
            this.folderBrowserDialog1.ShowDialog();
            this.txtSavePath.Text = this.folderBrowserDialog1.SelectedPath;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            this.openFileDialog1.DefaultExt = "*.dat";
            this.openFileDialog1.Title = "请选择要还原的数据库备份文件.";
            this.openFileDialog1.ShowDialog();
            this.txtBackUpFile.Text = this.openFileDialog1.FileName;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            this.Cursor = Cursors.WaitCursor;
            this.label6.Visible = true;
            this.progressBar1.Visible = true;
            this.RestoreDB();
            this.Cursor = Cursors.Default;
            this.label6.Text = "还原已完成!";
        }

        private void button6_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void button１_Click(object sender, EventArgs e)
        {
            this.txtSavePath.Text = Application.StartupPath;
//            GetSQLServerList();
            GetBackUpDB();
        }
    }
}