/// <summary>
/// 自定义数据库查询.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="expression"></param>
/// <returns></returns>
public IEnumerable <T> Query <T>(Action <SqlExp <T> > expression)
{
using (var conn = DbConnFactory.Open(DbName))
{
var exp = SqlExp <T> .GetSqlExp(conn);
expression(exp);
return(conn.Select(exp.GetExp()));
}
}