Question

我正在尝试使用C＃中的存储过程从MySQL数据库中获取数据，为了更精确地遵循三层体系结构我不确定下面的代码我在哪里错误代码我尝试了所有可能性小帮助将不胜感激很多。

DataServices Layer

    public DataSet FetchLoginDetails(string SchoolID)
    {
        object[] objparam = new object[1];
        objparam[0] = new MySqlParameter
        {
            ParameterName = "@SchoolID",
            DbType = System.Data.DbType.String,
            Value =SchoolID
        };

        DataSet dsdataRes = ExecuteQuery("Storeprociduer", objparam);
        return dsdataRes;

    }

BusinessServices

    private ITimeTableRepository ObjTimeTable
    {
        get { return UnityManager.Resolve<ITimeTableRepository>(); }
    }
    public DataSet FetchLoginDetails(string SchoolID)
    {
        return ObjTimeTable.FetchLoginDetails(SchoolID);
    }

BusnessServices.Interfaces

public interface ITimeTableBO
    {
        DataSet FetchLoginDetails(string SchoolID);
    }

UI .cs

public void LoadLoginDetails(DataSet ds)
    {
        if (ds.Tables.Count > 0)
        {
            if (ds.Tables[0].Rows.Count > 0)
            {
                ddlSubject.Items.Clear();

                ListItem item1 = new ListItem();
                item1.Text = "Choose a Subject";
                item1.Value = "-1";
                ddlSubject.Items.Add(item1);
                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {

                    ListItem item = new ListItem();
             item.Text = ds.Tables[0].Rows[i]["UserName"].ToString();
           item.Value = ds.Tables[0].Rows[i]["UserName"].ToString();
                    ddlSubject.Items.Add(item);
                }
            }

Aspx代码

                        <asp:DropDownList ID="ddlSubject" runat="server" Width="150px" 

Height="27px" ClientIDMode="Static"
                            AutoPostBack="true" >
                            <asp:ListItem Value="-1" Text="Choose a Subject"></asp:ListItem>
                        </asp:DropDownList>

Store Procidure

CREATE DEFINER=`root`@`localhost` PROCEDURE `Storeprociduer`(
SchoolID 

VARCHAR(255)
)
BEGIN

select UserName from scoolage_login where SchoolID = 

SchoolID ;


END

Answer 1

如果不查看代码的其他细节，我假设您无法连接并从MySQL数据库中检索数据。看一下MySqlCommand对象。还有代码示例：

https://dev.mysql.com/doc/connector-net/en/connector-net-tutorials-sql-command.html

尝试这样的事情：

    using (MySqlConnection con = new MySqlConnection(yourConnectionString))
    {
        using (MySqlCommand cmd = new MySqlCommand("Storeprociduer", con))
        {
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@SchoolID", SchoolID);
            using (MySqlDataAdapter sda = new MySqlDataAdapter(cmd))
            {
                DataTable dt = new DataTable();
                sda.Fill(dt);
                // Do something with results
            }
        }
    }

也可以看到这个问题：

calling mysql storedprocedure from c#?

Asp.net C＃Mysql使用存储过程获取数据表格数据库

1 个答案: