/// <summary>
/// 返回一个Query节
/// </summary>
/// <returns></returns>
public QuerySection From(QueryCreator creator)
{
if (creator.Table == null)
{
throw new DataException("用创建器操作时，表不能为null！");
}
FromSection <ViewEntity> f = this.From <ViewEntity>(creator.Table);
if (creator.IsRelation)
{
foreach (TableJoin join in creator.Relations.Values)
{
if (join.Type == JoinType.LeftJoin)
{
f.LeftJoin <ViewEntity>(join.Table, join.Where);
}
else if (join.Type == JoinType.RightJoin)
{
f.RightJoin <ViewEntity>(join.Table, join.Where);
}
else
{
f.InnerJoin <ViewEntity>(join.Table, join.Where);
}
}
}
QuerySection <ViewEntity> query = f.Select(creator.Fields).Where(creator.Where)
.OrderBy(creator.OrderBy);
return(new QuerySection(query));
}
/// <summary>
/// 进行查询操作
/// </summary>
/// <param name="fields"></param>
/// <returns></returns>
public TableRelation <T> Select(params Field[] fields)
{
section.Select(fields);
return(this);
}