[英]loop through dataset from sqlitereader c#
我通過這個從數據庫中獲取數據:
public static DataSet read_db(string sql)
{
DataSet ds = new DataSet();
try
{
SQLiteConnection m_dbConnection;
m_dbConnection = new SQLiteConnection("Data Source=movies.db;Version=3;");
m_dbConnection.Open();
SQLiteCommand command = new SQLiteCommand(sql, m_dbConnection);
//reader = command.ExecuteReader();
using (SQLiteDataAdapter adapter = new SQLiteDataAdapter(command))
{
adapter.Fill(ds);
}
m_dbConnection.Close();
return ds;
}
catch (SQLiteException ex)
{
string code = ex.Message.ToString();
MessageBox.Show("Error connection to database: " + code);
return ds;
}
}
現在,我試圖遍歷該數據集,並從數據庫中獲取值,使用的是來自sQLite的常規數據讀取器,但這無法正常工作,因為它將保持連接打開,直到我完成讀取為止,這意味着只要我的應用程序處於打開。
所以現在我必須將所有數據讀取器更改為使用數據集的方式,這是我以前的數據讀取器方式:
SQLiteDataReader reader = database.read_db("select * from proxies");
while (reader.Read())
{
DataGridViewRow row = new DataGridViewRow();
row.CreateCells(proxytable);
row.Cells[0].Value = reader["id"];
row.Cells[1].Value = reader["proxy"];
row.Cells[2].Value = reader["port"];
row.Cells[3].Value = reader["username"];
row.Cells[4].Value = reader["password"];
if (reader["dead"].ToString() == "0")
{
status = "ok";
}
else if(reader["dead"].ToString() == "2")
{
status = "not tested";
}
else
{
status = "ok";
}
row.Cells[5].Value = status;
this.proxytable.Rows.Add(row);
}
如何更改它以與數據集一起使用? 如果可能的話,只需進行很少的更改,因為我一直在使用此功能。
嘗試這樣...
DataSet ds= database.read_db("select * from proxies");
if (ds.Tables[0].Rows.Count > 0)
{
foreach (DataRow drw in ds.Tables[0].Rows)
{
DataGridViewRow row = new DataGridViewRow();
row.CreateCells(proxytable);
row.Cells[0].Value = drw ["id"];
row.Cells[1].Value = drw ["proxy"];
row.Cells[2].Value = drw ["port"];
row.Cells[3].Value = drw ["username"];
row.Cells[4].Value = drw ["password"];
}
}
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