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C#对mdb文件进行增删改查操作

C#对mdb文件进行增删改查操作


1.创建C#工程,工程名为MDBTest;
2.添加两个按钮,生成文件和添加数据;
3.创建数据库文件
添加引用,在“添加引用”对话框里切换到COM页面,选择“Microsoft ADO Ext. 2.8 for DDL and Security”,然后点击OK。在文件的开头using ADOX名字空间。然后添加如上面所示的代码就可以成功的创建Access 数据库了,代码如下:

        /// <summary>
        /// 创建Access数据库
        /// </summary>
        /// <param name="path">文件和文件路径</param>
        /// <returns>真为创建成功,假为创建失败或是文件已存在</returns>
        public bool CreateAccessDatabase(string path)
        {
            //创建ACCESS文件需要ADOX,创建引用,导入COM中的Microsoft ADO Ext. 2.8 for DLL and Security,并using ADOX;
            FileInfo myfile = new FileInfo(path);
            if (myfile.Exists)
            {
                //MessageBox.Show("当前文件夹下已存在文件,放弃创建"); 
                return false;
            }
            else
            {
                try
                {
                    ADOX.Catalog sldb = new ADOX.Catalog();
                    sldb.Create("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + path + ";" + "Jet OLEDB:Engine Type=5");//创建sldb.mdb
                    sldb = null;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(Convert.ToString(ex.Message));
                    return false;
                }
            }
            return true;
        }


创建数据库之后需要建表,整个过程代码如下:

private void button_createfile_Click(object sender, EventArgs e)
        {
            string path = System.IO.Directory.GetCurrentDirectory();
            path += "\\test.mdb";
            if (!CreateAccessDatabase(path))
            {
                return;
            }            
            //创建数据库文件成功后,开始建表
            ArrayList columnames = new ArrayList();
            columnames.Add("DTIME");
            columnames.Add("NAME");
            columnames.Add("AGE");            
            建表
            CreateMDBTable(path, "SNTable", columnames);            
            /          
        }


4.通过sql语句往数据库中添加数据

string strSql = "";
                OleDbConnection connet1 = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= " + path);
                connet1.Open();
                strSql = "insert into SNTable(DTIME,NAME,AGE) values ('" + strtime + "','" + "sfc" + "','" + "27" + "')";
              
                OleDbCommand cmd = new OleDbCommand(strSql, connet1);
                int a = cmd.ExecuteNonQuery();
                connet1.Close();


 
5.查询和删除记录

this._fileName = strDBFilePath;
                this._connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strDBFilePath + ";";
                //1、建立连接 C#操作Access之读取mdb 
                this._odcConnection = new OleDbConnection(this._connectionString);
                //2、打开连接 C#操作Access之读取mdb 
                this._odcConnection.Open();
///
                //建立SQL查询   
                OleDbCommand odCommand = _odcConnection.CreateCommand();
                //3、输入查询语句 C#操作Access之读取mdb  
                odCommand.CommandText = "select * from " + "SNTable";
                //建立读取   
                OleDbDataReader odrReader = odCommand.ExecuteReader();
                //查询并显示数据   
                int size = odrReader.FieldCount;
///
                //删除重复的PCBASN
                string strSqldpcbasn = "delete from SNTable where NAME ='" + "sfc" + "';";
                OleDbCommand cmd1 = new OleDbCommand(strSqldpcbasn, _odcConnection);
                int dnum = cmd1.ExecuteNonQuery();
                if (dnum > 0)
                {
                    MessageBox.Show("删除了"+dnum.ToString()+"条记录!!!");
                    //关闭连接 C#操作Access之读取mdb  
                    odrReader.Close();
                    _odcConnection.Close();
                    return true;
                }
                else
                {
                    MessageBox.Show("没有找到符合删除条件的记录!!!");
                }
                //关闭连接 C#操作Access之读取mdb  
                odrReader.Close();
                _odcConnection.Close();


完整的示例工程工程源码获取地址:http://download.csdn.net/download/shufac/10024483



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