Question

我尝试通过DataSet中的OleDB从Access数据库中获取一些数据。但DataSet方法后Fill()为空。当我在D *中手动触发它时，相同的语句可以工作并返回1行。

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，使用Dictonary可以更方便地访问数据。希望有人在这篇文章中找到帮助。谢谢大家的帮助！

Answer 1

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;

Answer 2

你需要这样做：

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

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'))";
OleDbDataAdapter DBAdapter = new OleDbDataAdapter();
DBAdapter.SelectCommand = new OleDbCommand(query, connection); 
DBAdapter.Fill(DS);

顺便问一下，这个DataSet1是什么？这应该是“DataSet”。

Answer 3

leDbConnection 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);

Answer 4

它对我有用，只需更改：Provider = Microsoft.Jet.OLEDB.4.0（VS2013）

OleDbConnection connection = new OleDbConnection(
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Z:\\GENERAL\\OFMPTP_PD_SG.MDB");
DataSet DS = new DataSet();
connection.Open();

string query =
@"SELECT * from MONTHLYPROD";
OleDbDataAdapter DBAdapter = new OleDbDataAdapter();
DBAdapter.SelectCommand = new OleDbCommand(query, connection);
DBAdapter.Fill(DS);

路易斯·蒙托亚

DataAdapter.Fill方法（数据集）

4 个答案: