使用存储过程从SQLCommand填充WPF数据网格

Question

我目前正在尝试使用一个使用SQLCommand执行存储过程并返回结果的类的成员来填充数据网格。

我的类成员（并在我认为问题在于）为：

public DataView DisplayHealthIndicator(DateTime startDate, DateTime endDate) 
{ 
    string queryString = 
     "DECLARE @RC int" 
     + "DECLARE @date_from datetime = dateadd(day, 0, datediff(day, 0, getdate()))" 
     + "DECLARE @date_to datetime = dateadd(day, 0, datediff(day, 0, getdate()))" 

     + "EXECUTE @RC = [Testing].[marlin].[support_retrieve_workflow_history] " 
      + "@date_from " 
      + ",@date_to" 
     + "GO"; 

    using (SqlConnection connection = new SqlConnection(GetConnectionString())) 
    { 
     using (var cmd = new SqlCommand(queryString, connection)) 
     { 
      connection.Open(); 

      var reader = cmd.ExecuteReader(); 

      var dt = new DataTable(); 
      dt.Load(reader); 

      return dt.DefaultView; 
     } 
    } 

} 

和我使用调用该成员：

var db = new DatabaseHandle(); 
     dataGridWorkflow.ItemsSource = db.DisplayHealthIndicator(DateTime.Now, DateTime.Now); 

但是！我目前收到的错误：

Incorrect syntax near @date_from 

Must declare the scalar variable @RC 

在一定程度上我理解的错误 - 我相信，我不能宣布我的SQLQuery字符串变量......但后来，我该怎么办呢？

我相当肯定，它并没有这方面的任何影响，但是在它的情况下，这是该存储过程的内容：

create procedure marlin.support_retrieve_workflow_history 
(
    @date_from datetime, 
    @date_to datetime 
) 
as 
select dateadd(day, 0, datediff(day, 0, e.event_date)) as 'Date', 
     c.setting_secondary 'Workflow Category' , 
     d.setting_main as 'Error Type' , 
     sum(e.event_count) as 'Total' 
from marlin.support_events e 
     inner join marlin.support_config c 
      on e.event_category = c.setting_code 
      and c.config_code = 60 
     inner join marlin.support_config d 
      on e.event_type = d.setting_code 
      and d.config_code = 70 
where e.event_date between @date_from and @date_to 
group by 
     e.event_date, 
     c.setting_secondary , 
     d.setting_main 

Answer 1

cmd.Parameters["@ReturnValue"]包含返回值 - 你不“T需要在动态SQL您的参数添加参数

添加到CMD

cmd.Parameters.AddWithValue("ParamName", Value); 

也改变了cmd.CommandType（可能不会被称为是，检查米余烬）到StoredProcedure

例如，

using (SqlConnection connection = new SqlConnection(GetConnectionString())) 
{ 
    using (var cmd = new SqlCommand(queryString, connection)) 
    { 
     connection.Open(); 

     cmd.CommandType = ??.StoredProcedure; // Can't remember what enum name is prob SqlCommandType or something 
     cmd.Parameters.AddWithValue("date_from", DateTime.blah.blah); 
     cmd.Parameters.AddWithValue("date_to", DateTime.blah.blah); 
     var reader = cmd.ExecuteReader(); 

     var dt = new DataTable(); 
     dt.Load(reader); 

     return dt.DefaultView; 
    } 
} 

免责声明：这些道具的名称，返回值参数的时名称可能不正确，从而检查文档:)

Answer 2

这个职位是有点老了...但是，我想分享我如何动态填充的WPF的DataGrid

private void Fill_DataGrid_ServiceName() 
    { 
     this.Cursor = Cursors.Wait; 

     // create an instance 
     DatabaseClass objDatabaseClass = new DatabaseClass(_connectionString); 

     // if we are able to open and close the SQL Connection then proceed 
     if (objDatabaseClass.CheckSQLConnection()) 
     { 
      try 
      { 
       // create an instance. variable 'con' will hold the instance 
       SqlConnection con = new SqlConnection(_connectionString); 

       con.Open(); 

       // Query to populate the Grid 
       string Query = @"SELECT 
           cm_mktdata_mdsservice_fits_to_finance_id_unique AS [Id Unique] 
           ,cm_mktdata_mdsservice_fits_to_finance_MDSService_fits AS [FITS MDSService] 
           ,cm_mktdata_mdsservice_fits_to_finance_MDSService_finance AS [Finance MDSService] 
           ,'[ ' + CONVERT(varchar, user_detail_user_info_id_user) + ' ] ' + user_detail_user_info_nm_login AS [Last Modified By] 
           ,cm_mktdata_mdsservice_fits_to_finance_record_version AS [Record Version] 
           ,cm_mktdata_mdsservice_fits_to_finance_dt_modified AS [Dt Modified] 
           ,cm_mktdata_mdsservice_fits_to_finance_ind_active AS [Ind Active] 
          FROM 
           dbo.v_mktdata_ui_mdsservice_fits_to_finance_detail 
          WHERE 
           cm_mktdata_mdsservice_fits_to_finance_ind_operational = 1 
          ORDER BY 
           cm_mktdata_mdsservice_fits_to_finance_MDSService_fits"; 


       SqlCommand createCommand = new SqlCommand(Query, con); 
       createCommand.ExecuteNonQuery(); 

       // transfer the results of createCommand to the dataGrid 
       SqlDataAdapter dataAdapter = new SqlDataAdapter(createCommand); 
       DataTable dt = new DataTable("vcm_mktdata_mdsservice_fits_to_finance"); 
       dataAdapter.Fill(dt); 
       dataGrid_ServiceName.ItemsSource = dt.DefaultView; 
       dataAdapter.Update(dt); 

       con.Close(); 

       // Enable the Refresh Grid Button 
       btn_RefreshGrid_ServiceName.IsEnabled = true; 


       // get DataGrid row count      
       lbl_dataGrid_RowCount_ServiceName.Content = dataGrid_ServiceName.Items.Count.ToString() + " rows"; 

       //return true; 
      } 
      catch (SqlException ex) 
      { 
       MessageBox.Show(ex.ToString()); 
       //return false; 
      } 
     } 
     else 
     { 
      MessageBox.Show("Connection not established to the SQL Server. " + Environment.NewLine + "The SQL Server may be offline or valid credentials are not yet granted.", "SQL Server Connection Error", MessageBoxButton.OK, MessageBoxImage.Error); 

      this.Close(); 
     } 

     this.Cursor = Cursors.Arrow; 
    } 

的DatabaseClass如下

class DatabaseClass 
{ 
    // Variables 
    private string _connectionString = ""; 


    public DatabaseClass(string connectionString) 
    { 
     _connectionString = connectionString; 
    } 

    /// Check to see if Connection can be opened 
    /// 
    /// Returns True if the connection can be open else it returns False 
    /// 
    public bool CheckSQLConnection() 
    { 
     SqlConnection con = new SqlConnection(_connectionString); 

     try 
     {   
      con.Open(); 
      con.Close(); 

      return true; 
     } 
     catch (SqlException ex) 
     {  
      return false; 
     } 
    } 

} 

而对于连接字符串，它看起来如下

public static string SQLDataSourceStr = "Data Source=MySQL-DB-DV;Initial Catalog=My_Data;Integrated Security=True";