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ExecuteReader是一個(gè)擴(kuò)展方法,可以從IDbConnection類型的任意對象中調(diào)用。它可以執(zhí)行查詢并將結(jié)果映射到不同類型的列表。
string sql = "SELECT * FROM Invoice;";
using (var connection = My.ConnectionFactory())
{
connection.Open();
var invoices = new List<Invoice>();
using (var reader = connection.ExecuteReader(sql))
{
var storeInvoiceParser = reader.GetRowParser<StoreInvoice>();
var webInvoiceParser = reader.GetRowParser<WebInvoice>();
while (reader.Read())
{
Invoice invoice;
switch ((InvoiceKind) reader.GetInt32(reader.GetOrdinal("Kind")))
{
case InvoiceKind.StoreInvoice:
invoice = storeInvoiceParser(reader);
break;
case InvoiceKind.WebInvoice:
invoice = webInvoiceParser(reader);
break;
default:
throw new Exception(ExceptionMessage.GeneralException);
}
invoices.Add(invoice);
}
}
}
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