/// <summary>
/// 读取最多一行数据。当无数据，返回null。当数据超过一行将只读取第一行
/// </summary>
/// <param name="converter"></param>
/// <returns></returns>
public object FirstLine(ConvertReaderToEntity converter)
{
using (SqlConnection conn = Connection()) {
using (SqlCommand cmd = conn.CreateCommand()) {
cmd.CommandText = SQLScript;
if (Parameters != null && Parameters.Count != 0) //Append pairs
{
foreach (KeyValuePair <string, object> p in Parameters)
{
cmd.Parameters.AddWithValue(p.Key, p.Value);
}
}
if (conn.State == System.Data.ConnectionState.Closed)
{
conn.Open();
}
object re = null;
using (SqlDataReader reader = cmd.ExecuteReader()) {
if (reader.Read())
{
re = converter(reader);
}
}
return(re);
}
}
}
public List <T> LinesStruct <T>(ConvertReaderToEntity converter) where T : struct
{
using (SqlConnection conn = Connection()) {
using (SqlCommand cmd = conn.CreateCommand()) {
cmd.CommandText = SQLScript;
if (Parameters != null && Parameters.Count != 0) //Append pairs
{
foreach (KeyValuePair <string, object> p in Parameters)
{
cmd.Parameters.AddWithValue(p.Key, p.Value);
}
}
if (conn.State == System.Data.ConnectionState.Closed)
{
conn.Open();
}
List <T> re = new List <T>();
T obj;
using (SqlDataReader reader = cmd.ExecuteReader()) {
if (reader.Read())
{
obj = (T)converter(reader);
re.Add(obj);
}
}
return(re);
}
}
}
