/// <summary>
/// from关键字
/// </summary>
/// <param name="handle"></param>
/// <returns></returns>
internal override void Tran(KeyWordInfomation info)
{
StringBuilder ret = new StringBuilder();
if (info.AliasManager == null)
{
for (int i = 0; i < _tables.Length; i++)
{
BQLTableHandle table = _tables[i];
string tableName = table.DisplayValue(info);
ret.Append(tableName);
if (i < _tables.Length - 1)
{
ret.Append(",");
}
}
info.Condition.Tables.Append(ret.ToString());
}
else
{
for (int i = 0; i < _tables.Length; i++)
{
BQLTableHandle table = _tables[i];
BQLAliasHandle ahandle = info.AliasManager.GetPrimaryAliasHandle(table);
if (!Buffalo.Kernel.CommonMethods.IsNull(ahandle))
{
_tables[i] = ahandle;
}
}
KeyWordFromItem from = info.AliasManager.ToInnerTable(this, info);
TableAliasNameManager manager = info.AliasManager;
info.AliasManager = null;
Stack <KeyWordFromItem> stkFrom = new Stack <KeyWordFromItem>();
while (from != null)
{
stkFrom.Push(from);
from = from.Previous as KeyWordFromItem;
}
while (stkFrom.Count > 0)
{
from = stkFrom.Pop();
from.Tran(info);
}
info.AliasManager = manager;
}
}
///// <summary>
///// 要查询的字段
///// </summary>
//internal BQLParamHandle[] Parameters
//{
// get
// {
// return parameters;
// }
//}
/// <summary>
/// From哪些表
/// </summary>
/// <param name="tables">表</param>
/// <returns></returns>
public KeyWordFromItem From(params BQLTableHandle[] tables)
{
KeyWordFromItem fromItem = new KeyWordFromItem(tables, this);
return(fromItem);
}
