/// <summary>
/// 重写列表变化事件
/// </summary>
/// <param name="e"></param>
protected override void OnListChanged(ListChangedEventArgs e)
{
if (e.ListChangedType == ListChangedType.ItemChanged)
{
// 添加以后需要强制设置为状态跟踪
this[e.NewIndex].SetTraceChange(true);
DTOBase changeItem = this[e.NewIndex];
// 将对象的UnChange状态修改为Update状态
if (changeItem.GetState() == DTOState.UnChange)
{
changeItem.SetState(DTOState.Update);
}
}
else if (e.ListChangedType == ListChangedType.ItemAdded)
{
// 添加以后需要强制设置为状态跟踪
this[e.NewIndex].SetTraceChange(true);
this[e.NewIndex].SetState(DTOState.New);
}
base.OnListChanged(e);
}
/// <summary>
/// 构造查询语句
/// </summary>
/// <param name="Entity">DTO</param>
/// <returns></returns>
public static string Build(DTOBase Entity)
{
StringBuilder sql = new StringBuilder(256);
var type = Entity.GetType();
sql.Append("select ");
if (Entity.SelectedColumns.Count == 0)
{
type.GetProperties().ToList().ForEach(o =>
{
var notfieldAttr = o.GetCustomAttributes(typeof(NotFieldAttribute), false);
if (!notfieldAttr.Any())
{
var dattr = o.GetCustomAttributes(typeof(DescriptionAttribute), false);
if (!dattr.Any())
{
var fattr = o.GetCustomAttributes(typeof(FictitiousAttribute), false);
if (!fattr.Any())
{
throw new DTOException("属性" + o.Name + "未标记为DescriptionAttribute或者FictitiousAttribute");
}
else
{
if (string.IsNullOrWhiteSpace((fattr[0] as FictitiousAttribute)?.DescribColmun))
{
sql.Append(o);
sql.Append(',');
}
else
{
sql.Append((fattr[0] as FictitiousAttribute)?.DescribColmun);
sql.Append(' ');
sql.Append(o);
sql.Append(',');
}
}
}
else
{
sql.Append(o.Name);
sql.Append(',');
}
}
});
}
else
{
var propertys = type.GetProperties().ToList();
Entity.SelectedColumns.ForEach(o =>
{
var property = propertys.FirstOrDefault(p => o == p.Name);
if (property == null)
{
throw new DTOException("在实体" + type.Name + "中,未找到属性" + o);
}
else
{
var dattr = property.GetCustomAttributes(typeof(DescriptionAttribute), false);
if (!dattr.Any())
{
var fattr = property.GetCustomAttributes(typeof(FictitiousAttribute), false);
if (!fattr.Any())
{
throw new DTOException("属性" + o + "未标记为DescriptionAttribute或者FictitiousAttribute");
}
else
{
if (string.IsNullOrWhiteSpace((fattr[0] as FictitiousAttribute)?.DescribColmun))
{
sql.Append(o);
sql.Append(',');
}
else
{
sql.Append((fattr[0] as FictitiousAttribute)?.DescribColmun);
sql.Append(' ');
sql.Append(o);
sql.Append(',');
}
}
}
else
{
sql.Append(o);
sql.Append(',');
}
}
});
}
sql = sql.Remove(sql.Length - 1, 1);
sql.Append(" from (");
if (string.IsNullOrWhiteSpace(Entity.GetDefaultSQL()))
{
if (string.IsNullOrWhiteSpace(Entity.QuerySql) || Entity.QuerySql.ToUpper().IndexOf("Select", StringComparison.Ordinal) < 0)
{
throw new DTOException("Sql语句无法执行,请检查传入的WHERE条件和" + type.Name + "类是否标记了DefaultSql属性");
}
sql.AppendFormat(" {0}", Entity.QuerySql);
sql.Append(")");
}
else
{
sql.Append(Entity.GetDefaultSQL());
sql.Append(")");
sql.AppendFormat(" {0}", Entity.QuerySql);
}
return(sql.ToString());
}
