我正在研究Microsoft Visual Studio的DAL，通过从网站数据库的ItemDetails表中检索数据来创建ItemDetails.aspx文件，我正在采用传统的方法来获取/更新数据以显示网站所列项目的评论。我添加了DropDownList Control来显示其类别中的所有项目。
从下拉列表中选择类别后，它将显示该类别中的所有项目，并带有附加的"Show Details"超链接以在网格 View 中显示详细信息。
我是新手，我不知道为asp.net网站创建DAL。需要简单的准则来为asp.net网站创建DAL。帮助将不胜感激。还有什么其他方法可以创建DAL而不是SQLadapter。
最佳答案
因此，例如，这是我之前用来调用SP的DAL。
它允许您执行存储过程并返回数据集，数据表，成功响应等。
确实，这取决于您打算如何访问数据，要编写存储过程还是要在代码中进行查询。您还可以选择使用Entity Framework/LINQ。
using System;
using System.Collections.Generic;
using System.Web;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Configuration;
public class _DataInteraction
{
#region "Stored Procedures"
public static DataTable stdReturnDataTableQuery(string procedureName, string db)
{
DataTable myDataTable;
SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings[db].ConnectionString);
SqlCommand cmd = new SqlCommand();
SqlDataAdapter myDataAdapter = new SqlDataAdapter();
cmd.CommandText = procedureName;
cmd.CommandType = CommandType.Text;
cmd.Connection = myConnection;
//-----------------------------------------------------------------------
// make our datatable to return
//-----------------------------------------------------------------------
myDataTable = new DataTable();
//-----------------------------------------------------------------------
// fill the datatable with the stored procedure results
//-----------------------------------------------------------------------
try
{
myConnection.Open();
myDataAdapter.SelectCommand = cmd;
myDataAdapter.Fill(myDataTable);
}
catch (Exception ex)
{
//flag as error happened
throw ex;
}
finally
{
myConnection.Close();
if ((myDataAdapter != null))
myDataAdapter.Dispose();
if ((cmd != null))
cmd.Dispose();
}
return myDataTable;
}
// Return a datatable from the database
public static DataTable stdReturnDataTable(string procedureName, List<SqlParameter> myParameters, string db)
{
SqlConnection myConnection = default(SqlConnection);
SqlCommand myCommand = default(SqlCommand);
SqlDataAdapter myDataAdapter = default(SqlDataAdapter);
DataTable myDataTable = default(DataTable);
string connString = null;
// -----------------------------------------------------------------------
// create instance of connection
// -----------------------------------------------------------------------
connString = ConfigurationManager.ConnectionStrings[db].ConnectionString;
myConnection = new SqlConnection();
myConnection.ConnectionString = connString;
//-----------------------------------------------------------------------
// create instance of command and dataadapter
//-----------------------------------------------------------------------
myCommand = new SqlCommand(procedureName, myConnection);
myDataAdapter = new SqlDataAdapter(myCommand);
//-----------------------------------------------------------------------
// say its a stored procedure command
//-----------------------------------------------------------------------
myCommand.CommandType = CommandType.StoredProcedure;
//-----------------------------------------------------------------------
// add any parameters?
//-----------------------------------------------------------------------
if ((myParameters != null))
{
foreach (SqlParameter myParm in myParameters)
{
// add the parameter to the command
myCommand.Parameters.Add(myParm);
}
}
//-----------------------------------------------------------------------
// make our datatable to return
//-----------------------------------------------------------------------
myDataTable = new DataTable();
//-----------------------------------------------------------------------
// fill the datatable with the stored procedure results
//-----------------------------------------------------------------------
try
{
myConnection.Open();
myDataAdapter.Fill(myDataTable);
}
catch (Exception ex)
{
//flag as error happened
throw ex;
}
finally
{
myConnection.Close();
if ((myDataAdapter != null))
myDataAdapter.Dispose();
if ((myCommand != null))
myCommand.Dispose();
}
return myDataTable;
}
// Return a dataset from the database
public static DataSet stdReturnDataset(string procedureName, List<SqlParameter> myParameters, string db)
{
SqlConnection myConnection = default(SqlConnection);
SqlCommand myCommand = default(SqlCommand);
SqlDataAdapter myDataAdapter = default(SqlDataAdapter);
DataSet ds = new DataSet();
string connString = null;
//-----------------------------------------------------------------------
// create instance of connection
//-----------------------------------------------------------------------
connString = ConfigurationManager.ConnectionStrings[db].ConnectionString;
myConnection = new SqlConnection();
myConnection.ConnectionString = connString;
//-----------------------------------------------------------------------
// create instance of command and dataadapter
//-----------------------------------------------------------------------
myCommand = new SqlCommand(procedureName, myConnection);
myDataAdapter = new SqlDataAdapter(myCommand);
//-----------------------------------------------------------------------
// say its a stored procedure command
//-----------------------------------------------------------------------
myCommand.CommandType = CommandType.StoredProcedure;
//-----------------------------------------------------------------------
// add any parameters?
//-----------------------------------------------------------------------
if ((myParameters != null))
{
foreach (SqlParameter myParm in myParameters)
{
// add the parameter to the command
myCommand.Parameters.Add(myParm);
}
}
//-----------------------------------------------------------------------
// fill the datatable with the stored procedure results
//-----------------------------------------------------------------------
try
{
myConnection.Open();
myDataAdapter.Fill(ds);
}
catch (Exception ex)
{
//flag as error happened
throw ex;
}
finally
{
myConnection.Close();
if ((myDataAdapter != null))
myDataAdapter.Dispose();
if ((myCommand != null))
myCommand.Dispose();
}
return ds;
}
// Return success from a query from the database
public static bool db_NonQuerySuccessResponse(string strCommandText, List<SqlParameter> myParameters, string db)
{
SqlConnection SQLConnection = new SqlConnection(ConfigurationManager.ConnectionStrings[db].ConnectionString);
SqlCommand SQLCommand = new SqlCommand();
DataSet ds = new DataSet();
string Value = "";
bool success = false;
try
{
SQLCommand.CommandText = strCommandText;
SQLCommand.CommandType = CommandType.StoredProcedure;
SQLCommand.Parameters.Clear();
if ((myParameters != null))
{
foreach (SqlParameter myParm in myParameters)
{
// add the parameter to the command
SQLCommand.Parameters.Add(myParm);
}
}
SQLCommand.Connection = SQLConnection;
SQLConnection.Open();
SQLCommand.ExecuteNonQuery();
SQLConnection.Close();
success = true;
}
catch (Exception ex)
{
success = false;
return success;
}
return success;
}
// General non query, no results no success
public static bool db_NonQuery(string strCommandText, List<SqlParameter> myParameters, string db)
{
SqlConnection SQLConnection = new SqlConnection(ConfigurationManager.ConnectionStrings[db].ConnectionString);
SqlCommand SQLCommand = new SqlCommand();
DataSet ds = new DataSet();
try
{
SQLCommand.CommandText = strCommandText;
SQLCommand.CommandType = CommandType.StoredProcedure;
SQLCommand.Parameters.Clear();
if ((myParameters != null))
{
foreach (SqlParameter myParm in myParameters)
{
// add the parameter to the command
SQLCommand.Parameters.Add(myParm);
}
}
SQLCommand.Connection = SQLConnection;
SQLConnection.Open();
SQLCommand.ExecuteNonQuery();
SQLConnection.Close();
}
catch (Exception ex)
{
return false;
}
return true;
}
//// Execute scalar on db
//public static string db_Scalar(string strCommandText, ref List<SqlParameter> myParameters, string db)
//{
// SqlConnection SQLConnection = new SqlConnection(ConfigurationManager.ConnectionStrings[db].ConnectionString);
// SqlCommand SQLCommand = new SqlCommand();
// string Value = "";
// SQLCommand.CommandText = strCommandText;
// SQLCommand.CommandType = CommandType.StoredProcedure;
// SQLCommand.Parameters.Clear();
// if ((myParameters != null))
// {
// foreach (SqlParameter myParm in myParameters)
// {
// // add the parameter to the command
// SQLCommand.Parameters.Add(myParm);
// }
// }
// SQLCommand.Connection = SQLConnection;
// SQLConnection.Open();
// Value = SQLCommand.ExecuteScalar;
// SQLConnection.Close();
// return Value;
//}
#endregion
}
关于asp.net - 为ASP.NET网站创建DAL，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/15291898/