问题描述

我尝试通过 DataSet 中的 OleDB 从 Access 数据库中获取一些数据.但是在 Fill() 方法之后 DataSet 是空的.当我在 D* 中手动触发它们时，相同的语句有效并返回 1 行.

i try to get some Data from a Access Database via OleDB in a DataSet. But the DataSet is empty after the Fill() method. The same statement works and return 1 row when i trigger them manually in D*.

OleDbConnection connection = 
   new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Inventar.accdb");
DataSet1 DS = new DataSet1();
connection.Open();

OleDbDataAdapter DBAdapter = new OleDbDataAdapter(
    @"SELECT tbl_Computer.*,  tbl_Besitzer.*
      FROM tbl_Computer 
      INNER JOIN tbl_Besitzer ON tbl_Computer.FK_Benutzer = tbl_Besitzer.ID 
      WHERE (((tbl_Besitzer.Vorname)='ma'));", 
    connection);

DBAdapter.Fill(DS);

提前致谢.

新的工作代码:

DataSet ds = new DataSet();
OleDbDataAdapter DBAdapter = new OleDbDataAdapter();

OleDbConnection connection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Inventar.accdb");
string query = @"
    SELECT tbl_Computer.*,  tbl_Besitzer.*
    FROM tbl_Computer 
    INNER JOIN tbl_Besitzer ON tbl_Computer.FK_Benutzer = tbl_Besitzer.ID 
    WHERE (((tbl_Besitzer.Vorname)='ma'));";

connection.Open();

using (OleDbCommand command = new OleDbCommand(query, connection))
using (OleDbDataAdapter adapter = new OleDbDataAdapter(command))
{
    adapter.Fill(ds);
}

Dictionary<string, string> DictValues = new Dictionary<string, string>();

for (int i = 0; i <= ds.Tables[0].Rows[0].ItemArray.Length - 1; i++)
{
    MessageBox.Show(ds.Tables[0].Rows[0].ItemArray[i] + " -- " + ds.Tables[0].Rows[0].Table.Columns[i]);
    DictValues.Add(ds.Tables[0].Rows[0].Table.Columns[i].ToString(), ds.Tables[0].Rows[0].ItemArray[i].ToString());
}

现在正确的代码发布在上面，带有一个字典可以更舒适地访问数据.希望有人在这篇文章中找到帮助.谢谢大家让它工作！

Now The Right code is posted above, with an Dictonary to access the Data more comfortable. hope anybody find help in this post. Thank you all for get it work !

推荐答案

DataSet ds = new DataSet();

using (OleDbConnection connection = new OleDbConnection(connectionString))
using (OleDbCommand command = new OleDbCommand(query, connection))
using (OleDbDataAdapter adapter = new OleDbDataAdapter(command))
{
    adapter.Fill(ds);
}

return ds;

这篇关于DataAdapter.Fill(数据集)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！