Disconnected Data Access

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4 Disconnected Data Access

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11 string strconnection = ConfigurationManager.ConnectionStrings["MyConn"].ToString(); // Khai báo không tham số SqlConnection objconnection = new SqlConnection(); objconnection.connectionstring = strconnection; // Hoặc khai báo có tham số SqlConnection objconnection = new SqlConnection(strConnection);

12 ConnectionString

13 <connectionstrings> <add name="myconn" connectionstring="data Source=CHUHUONG;Initial Catalog=TestDaTang;Integrated Security=True" providername="system.data.sqlclient"/> </connectionstrings> <appsettings> <add key="myconn" value="server=chuhuong;database=qlbanhang; user id=sa;password=pass2013" /> </appsettings>

14 // Truy xuất chuỗi kết nối trên web.config string strconnection = ConfigurationManager.ConnectionStrings["MyConn"].ToString (); //Hoặc string strconnection= WebConfigurationManager.ConnectionStrings["MyConn"].ToString (); // Hoặc string strconnection= ConfigurationManager.AppSettings["Mycon"];

15 /// Open Database Connection if Closed or Broken if (objconnection.state == ConnectionState.Closed objconnection.state == ConnectionState.Broken) { objconnection.open(); }... objconnection.close();

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17 // Khai báo không tham số SqlCommand objcommand = new SqlCommand(); // Khai báo có tham số SqlCommand objcommand = new SqlCommand("Select * from tbluser",objconnection);

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19 public int Insert(string MaDM, string TenDM) { SqlConnection objconnection = new SqlConnection(KetNoi.Chuoiketnoi()); objconnection.open(); SqlCommand objcommand=new SqlCommand("Insert Into DanhMuc (MaDM, TenDM) Values objconnection); try { objcommand.parameters.add("@madm", SqlDbType.NVarChar, 5); objcommand.parameters.add("@tendm", SqlDbType.NVarChar, 50); objcommand.parameters["@madm"].value = MaDM; objcommand.parameters["@tendm"].value = TenDM; return objcommand.executenonquery();} catch { throw; } finally{ objcommand.dispose(); objconnection.close(); objconnection.dispose();} }

20 public int Update(string MaDM, string TenDM) { SqlConnection objconnection = new SqlConnection(KetNoi.Chuoiketnoi()); objconnection.open(); SqlCommand objcommand = new SqlCommand("UpdateDanhMuc)", objconnection); objcommand.commandtype = CommandType.StoredProcedure; try{ objcommand.parameters.addwithvalue("@madm", MaDM); objcommand.parameters.addwithvalue("@tendm", TenDM); return objcommand.executenonquery();} catch { throw;} finally { objcommand.dispose(); objconnection.close(); objconnection.dispose();} }

21 MaDM); SqlDbType.NVarChar, 5); SqlDbType.NVarChar, 50); = MaDM; = TenDM;

22 SqlParameter sqlpraid = new SqlParameter("@ID", SqlDbType.Int); sqlpraid.direction = ParameterDirection.Output; //... objcommand.parameters.add(sqlpraid); objcommand.executenonquery(); int ID =(int)sqlpraid.value;

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25 SqlConnection objconnection = new SqlConnection(KetNoi.Chuoiketnoi()); // Khai báo đối tượng DataAdapter SqlDataAdapter objdataadapter = new SqlDataAdapter(); // Khai báo đối tượng Command SqlCommand objcommand = new SqlCommand(); objcommand.commandtext = "LoadAllDM"; objcommand.connection = objconnection; objcommand.commandtype = CommandType.StoredProcedure; // Thuộc tính SelectCommand chỉ định đến đối tượng Command objdataadapter.selectcommand = objcommand;

26 // Đẩy dữ liệu vào DataSet objdataadapter.fill(objdataset, "TenBang"); // Đẩy dữ liệu vào DataTable objdataadapter.fill(objdatatable);

27 //Bước 1 SqlConnection objconnection = new SqlConnection(KetNoi.Chuoiketnoi()); SqlDataAdapter objdataadapter = new SqlDataAdapter("Select * from tbluser", objconnection); // Bước 2 DataSet objdataset = new DataSet(); objdataadapter.fill(objdataset, "tbluser"); // Bước 3: Code Insert, Update, Delete row objdataset.tables["tbluser"].rows[0].delete(); // Bước 4: automatically create update/delete/insert commands SqlCommandBuilder objcommandbuilder = new SqlCommandBuilder(objDataAdapter); objcommandbuilder.getdeletecommand(); // Bước 5: objdataadapter.update(objdataset);

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30 string strconn = ConfigurationManager.ConnectionStrings["MyConn"].ToString(); SqlConnection objconnection = new SqlConnection(strConn); SqlCommand objcommand=new SqlCommand("SELECT MaDM,TenDM From DANHMUC", objconnection); objconnection.open(); SqlDataReader objdatareader = objcommand.executereader(); if (objdatareader.hasrows) { while (objdatareader.read()) { ListItem item = new ListItem(); item.value = objdatareader.getint32(0).tostring(); item.text = objdatareader.getstring(1); } cbodm.items.add(item); } objconnection.close();

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41 public DataTable LoadAllDM() { SqlConnection conn = new SqlConnection(KetNoi.Chuoiketnoi()); SqlDataAdapter dad = new SqlDataAdapter(); SqlCommand cm = new SqlCommand("LoadAllDM, conn); cm.commandtype = CommandType.StoredProcedure; dad.selectcommand = cm; DataSet dset = new DataSet(); try { dad.fill(dset, "DanhmucAll"); return dset.tables["danhmucall"]; } catch { throw;} finally { dset.dispose(); dad.dispose(); conn.close(); conn.dispose();} }

42 public DataTable LoadAllDM() { SqlConnection conn = new SqlConnection(KetNoi.Chuoiketnoi()); SqlDataAdapter dad = new SqlDataAdapter(); SqlCommand cm = new SqlCommand("LoadAllDM, conn); cm.commandtype = CommandType.StoredProcedure; dad.selectcommand = cm; DataSet dset = new DataSet(); try { dad.fill(dset, "DanhmucAll"); return dset.tables["danhmucall"]; } catch { throw;} finally { dset.dispose(); dad.dispose(); conn.close(); conn.dispose();} }

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46 string strconn = ConfigurationManager.ConnectionStrings["MyConn"].ToString(); SqlConnection objconnection = new SqlConnection(strConn); SqlDataAdapter objdataadapter = new SqlDataAdapter("SELECT MaDM, TenDM From DANHMUC", objconnection); DataTable objdatatable = new DataTable(); objdatatable.tablename = "DANHMUC"; objdatatable.acceptchanges(); objdataadapter.fill(objdatatable); txttendm.text = objdatatable.rows[0]["tendm"].tostring();

47 string strconn = ConfigurationManager.ConnectionStrings["MyConn"].ToString(); SqlConnection objconnection = new SqlConnection(strConn); SqlDataAdapter objdataadapter = new SqlDataAdapter("SELECT MaDM, TenDM From DANHMUC", objconnection); DataTable objdatatable = new DataTable(); objdatatable.tablename = "DANHMUC"; objdatatable.acceptchanges(); objdataadapter.fill(objdatatable); txttendm.text = objdatatable.rows[0]["tendm"].tostring();

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49 DataTable dtableemployee = new DataTable("Employees"); DataColumn dcolemployeeid = new DataColumn(); dcolemployeeid.datatype= Type.GetType("System.String"); dcolemployeeid.caption = "EmployeeID"; dcolemployeeid.columnname = "EmployeeID"; dcolemployeeid.unique = true; dtableemployee.columns.add(dcolemployeeid); DataRow drowemployee = dtableemployee.newrow(); drowemployee["employeeid"] = "E001"; drowemployee.rowerror = "Có lỗi"; dtableemployee.rows.add(drowemployee); drowemployee = dtableemployee.newrow(); drowemployee["employeeid"] = "E002"; drowemployee.rowerror = "Có lỗi"; dtableemployee.rows.add(drowemployee); GridView1.DataSource = dtableemployee; GridView1.DataBind();

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51 DataTable dtableemployee = new DataTable("Employees"); DataColumn dcolemployeeid = new DataColumn(); dcolemployeeid.datatype= Type.GetType("System.String"); dcolemployeeid.caption = "EmployeeID"; dcolemployeeid.columnname = "EmployeeID"; dcolemployeeid.unique = true; dtableemployee.columns.add(dcolemployeeid); DataRow drowemployee = dtableemployee.newrow(); drowemployee["employeeid"] = "E001"; drowemployee.rowerror = "Có lỗi"; dtableemployee.rows.add(drowemployee); drowemployee = dtableemployee.newrow(); drowemployee["employeeid"] = "E002"; drowemployee.rowerror = "Có lỗi"; dtableemployee.rows.add(drowemployee); GridView1.DataSource = dtableemployee; GridView1.DataBind();

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54 string strconn = ConfigurationManager.ConnectionStrings["MyConn"].ToString(); SqlConnection objconnection = new SqlConnection(strConn); SqlDataAdapter objdataadapter = new SqlDataAdapter("SELECT MaDM, TenDM From DANHMUC", objconnection); DataSet objdataset = new DataSet(); objdataadapter.fill(objdataset, "DANHMUC"); objdataadapter = new SqlDataAdapter("SELECT * From tbluser", objconnection); objdataadapter.fill(objdataset, "USER"); DataTableCollection objtablecollection=objdataset.tables; foreach (DataTable tbl in objtablecollection) { } cmbten.items.add(tbl.tablename);

55 string strconn = ConfigurationManager.ConnectionStrings["MyConn"].ToString(); SqlConnection objconnection = new SqlConnection(strConn); SqlDataAdapter objdataadapter = new SqlDataAdapter("SELECT MaDM, TenDM From DANHMUC", objconnection); DataSet objdataset = new DataSet(); objdataadapter.fill(objdataset, "DANHMUC"); objdataadapter = new SqlDataAdapter("SELECT * From tbluser", objconnection); objdataadapter.fill(objdataset, "USER"); DataTableCollection objtablecollection=objdataset.tables; foreach (DataTable tbl in objtablecollection) { } cmbten.items.add(tbl.tablename);

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57 DanhMuc dmsach = new DanhMuc(); DataTable tblsach = dmsach.loadallsp(); GridView1.DataSource = tblsach; GridView1.DataBind(); DataView dviewsach1 = new DataView(tblSach); dviewsach1.sort = "MaDanhMuc DESC"; GridView2.DataSource = dviewsach1; GridView2.DataBind(); DataView dviewsach2 = new DataView(tblSach); dviewsach2.rowfilter = "MaDanhMuc=1"; GridView3.DataSource = dviewsach2; GridView3.DataBind();

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59 DanhMuc dmsach = new DanhMuc(); DataTable tblsach = dmsach.loadallsp(); GridView1.DataSource = tblsach; GridView1.DataBind(); DataView dviewsach1 = new DataView(tblSach); dviewsach1.sort = "MaDanhMuc DESC"; GridView2.DataSource = dviewsach1; GridView2.DataBind(); DataView dviewsach2 = new DataView(tblSach); dviewsach2.rowfilter = "MaDanhMuc=1"; GridView3.DataSource = dviewsach2; GridView3.DataBind();

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