Question

我正在编写一个当前只包含SELECT查询的存储过程。它将被扩展为执行许多其他操作，这就是为什么它必须是存储过程，但是现在，它是一个简单的查询。

这样的事情：

SELECT name, occupation, position 
FROM jobs 
WHERE ...

我希望返回要在C＃中使用的此查询的结果。我想将它添加到列表中，以便我可以将它绑定到GridView组件。

但是，我不知道如何解决这个问题。如果我必须在返回所有选定的数据后将其插入到列表中，那就没关系，我只需要知道如何正确地返回数据以便我可以这样做。

如果我能以一种可以直接弹出到列表中的格式返回它，那将是理想的。

Answer 1

在存储过程中，您只需编写如下所示的选择查询：

CREATE PROCEDURE TestProcedure
AS
BEGIN
    SELECT ID, Name 
    FROM Test
END

在C＃端，您可以使用Reader，datatable，adapter。

进行访问

使用适配器刚刚由Susanna Floora解释。

使用Reader：

SqlConnection connection = new SqlConnection(ConnectionString);

command = new SqlCommand("TestProcedure", connection);
command.CommandType = System.Data.CommandType.StoredProcedure;
connection.Open();
SqlDataReader reader = command.ExecuteReader();

List<Test> TestList = new List<Test>();
Test test = null;

while (reader.Read())
{
    test = new Test();
    test.ID = int.Parse(reader["ID"].ToString());
    test.Name = reader["Name"].ToString();
    TestList.Add(test);
}

gvGrid.DataSource = TestList;
gvGrid.DataBind();

使用dataTable：

SqlConnection connection = new SqlConnection(ConnectionString);

command = new SqlCommand("TestProcedure", connection);
command.CommandType = System.Data.CommandType.StoredProcedure;
connection.Open();

DataTable dt = new DataTable();

dt.Load(command.ExecuteReader());
gvGrid.DataSource = dt;
gvGrid.DataBind();

我希望它会对你有所帮助。：）

Answer 2

 SqlConnection connection = new SqlConnection(ConnectionString);

 command = new SqlCommand("TestProcedure", connection);
 command.CommandType = System.Data.CommandType.StoredProcedure;

 connection.Open();

 DataTable dt = new DataTable();

 dt.Load(command.ExecuteReader());

 gvGrid.DataSource = dt;
 gvGrid.DataBind();

Answer 3

SqlConnection con = new SqlConnection("Data Source=DShp;Initial Catalog=abc;Integrated Security=True");
SqlDataAdapter da = new SqlDataAdapter("data", con);

da.SelectCommand.CommandType= CommandType.StoredProcedure;

DataSet ds=new DataSet();

da.Fill(ds, "data");
GridView1.DataSource = ds.Tables["data"];
GridView1.DataBind();

Answer 4

我有同样的问题，花了我很多年才找到一个简单的解决方案。

使用ASP.NET MVC 5和EF 6：

将存储过程添加到.edmx模型时，存储过程的结果将通过名为yourStoredProcName_result的自动生成对象传递。

此_result对象包含与存储过程选择的数据库中的列对应的属性。

_result类可以简单地转换为列表：

yourStoredProcName_result.ToList()

Answer 5

获得参数？

        SqlConnection conn = new SqlConnection(func.internalConnection);
        var cmd = new SqlCommand("usp_CustomerPortalOrderDetails", conn);
        cmd.CommandType = System.Data.CommandType.StoredProcedure;
        cmd.Parameters.Add("@CustomerId", SqlDbType.Int).Value = customerId;
        cmd.Parameters.Add("@Qid", SqlDbType.VarChar).Value = qid;
        conn.Open();

        // Populate Production Panels
        DataTable listCustomerJobDetails = new DataTable();
        listCustomerJobDetails.Load(cmd.ExecuteReader());
        conn.Close();

Answer 6

// GET: api/GetStudent

public Response Get() {
    return StoredProcedure.GetStudent();
}

public static Response GetStudent() {
    using (var db = new dal()) {
        var student = db.Database.SqlQuery<GetStudentVm>("GetStudent").ToList();
        return new Response {
            Sucess = true,
            Message = student.Count() + " Student found",
            Data = student
        };
    }
}

Answer 7

基于此处的某些响应，我想添加一种替代方法。使用反射创建通用方法，该方法可以将任何存储过程响应映射到列表。也就是说，您想要的任何类型的List，只要给定类型包含响应中“存储过程”列的名称相似的成员即可。理想情况下，我可能会为此使用Dapper-但去了：

private static SqlConnection getConnectionString() // Should be gotten from config in secure storage.
        {
            SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();
            builder.DataSource = "it.hurts.when.IP";
            builder.UserID = "someDBUser";
            builder.Password = "someDBPassword";
            builder.InitialCatalog = "someDB";
            return new SqlConnection(builder.ConnectionString);
        }

        public static List<T> ExecuteSP<T>(string SPName, List<SqlParameter> Params)
        {
            try
            {
                DataTable dataTable = new DataTable();

                using (SqlConnection Connection = getConnectionString())
                {
                    // Open connection
                    Connection.Open();

                    // Create command from params / SP
                    SqlCommand cmd = new SqlCommand(SPName, Connection);

                    // Add parameters
                    cmd.Parameters.AddRange(Params.ToArray());
                    cmd.CommandType = CommandType.StoredProcedure;

                    // Make datatable for conversion
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    da.Fill(dataTable);
                    da.Dispose();

                    // Close connection
                    Connection.Close();
                }

                // Convert to list of T
                var retVal = ConvertToList<T>(dataTable);
                return retVal;
            }
            catch (SqlException e)
            {
                Console.WriteLine("ConvertToList Exception: " + e.ToString());
                return new List<T>();
            }
        }

        /// <summary>
        /// Converts datatable to List<someType> if possible.
        /// </summary>
        public static List<T> ConvertToList<T>(DataTable dt)
        {
            try // Necesarry unfotunately.
            {
                var columnNames = dt.Columns.Cast<DataColumn>()
                    .Select(c => c.ColumnName)
                    .ToList();

                var properties = typeof(T).GetProperties();

                return dt.AsEnumerable().Select(row =>
                    {
                        var objT = Activator.CreateInstance<T>();

                        foreach (var pro in properties)
                        {
                            if (columnNames.Contains(pro.Name))
                            {
                                if (row[pro.Name].GetType() == typeof(System.DBNull)) pro.SetValue(objT, null, null);
                                else pro.SetValue(objT, row[pro.Name], null);
                            }
                        }

                        return objT;
                    }).ToList();
            }
            catch (Exception e)
            {
                Console.WriteLine("Failed to write data to list. Often this occurs due to type errors (DBNull, nullables), changes in SP's used or wrongly formatted SP output.");
                Console.WriteLine("ConvertToList Exception: " + e.ToString());
                return new List<T>();
            }
        }

要点：https://gist.github.com/Big-al/4c1ff3ed87b88570f8f6b62ee2216f9f

Answer 8

可能会有所帮助：

从DB获取行：

public static DataRowCollection getAllUsers(string tableName) 
{
     DataSet set = new DataSet();
     SqlCommand comm = new SqlCommand();
     comm.Connection = DAL.DAL.conn;
     comm.CommandType = CommandType.StoredProcedure;
     comm.CommandText = "getAllUsers";
     SqlDataAdapter da = new SqlDataAdapter();
     da.SelectCommand = comm;
     da.Fill(set,tableName);

     DataRowCollection usersCollection = set.Tables[tableName].Rows;
     return usersCollection;
}

从DataRowCollection中填充DataGridView：

public static void ShowAllUsers(DataGridView grdView,string table, params string[] fields) 
{
    DataRowCollection userSet = getAllUsers(table);
    foreach (DataRow user in userSet)
    {
         grdView.Rows.Add(user[fields[0]],
         user[fields[1]],
         user[fields[2]],
         user[fields[3]]);
    }
}

实施：

BLL.BLL.ShowAllUsers(grdUsers,"eusers","eid","euname","eupassword","eposition");

将存储过程中的Select Query的结果返回到List

8 个答案: