如何使用Visual C＃來檢索在MS Access數據庫中同一行數據

Question

請我想知道如何使用Visual C＃

在MS Access數據庫中檢索同一行數據我想從組合框中選擇一個關鍵字的含義

這是我的代碼;

private void cmd_SearchResult_Click(object sender, EventArgs e) 

{ 

    connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0; 
      Data Source=C:\Users\hp\Documents\KnowledgeBase.accdb; 
      Persist Security Info=False;"; 

    using (var conn = new OleDbConnection(connection.ConnectionString)) 
    using (var command = connection.CreateCommand()) 
    {     
     command.Connection = conn; 
     command.CommandText = "select Meaning from KnowledgeBase where Keyword = @Keyword"; 
     command.Parameters.AddWithValue("Keyword", String.Copy(cbo_SearchResult.Text)); 
     connection.Open(); 
     var reader = command.ExecuteReader(); 
     while (reader.Read()) 
     { 
      lbl_Display.Text = reader["Meaning"].ToString(); 

     } 
    } 
} 

Answer 1

嘗試更類似於以下內容。我不確定「連接」對象是什麼，但放下一個簡單的字符串，如圖所示。

string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0; 
     Data Source=C:\Users\hp\Documents\KnowledgeBase.accdb; 
     Persist Security Info=False;"; 

using (var conn = new OleDbConnection(connectionString)) 
{ 
    conn.Open(); 
    using (var command = conn.CreateCommand()) 
    {     
     command.CommandType = CommandType.Text; 
     command.CommandText = "select Meaning from KnowledgeBase where Keyword = @Keyword"; 

     command.Parameters.AddWithValue("Keyword", cbo_SearchResult.Text); 

     object result = command.ExecuteScalar(); 

     if (result != null) 
     { 
      lbl_Display.Text = result.ToString(); 
     } 
    } 
}