/// <summary>
/// 分组查询
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public IFrom <T> GroupBy(Expression <Func <T, object> > expression)
{
GroupBy(string.Format("{0}", string.Join(",", WhererVisitor.GetColumnNames(expression))));
return(this);
}
/// <summary>
/// 异步查询单个实体:指定查询列
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public Task <IEnumerable <T> > SingleAsync(Expression <Func <T, object> > expression)
{
var task = SingleAsync(string.Join(",", WhererVisitor.GetColumnNames <T>(expression)));
return(task);
}
/// <summary>
/// 异步查询:指定字段列表
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public Task <IEnumerable <T> > SelectAsync(Expression <Func <T, object> > expression)
{
var data = SelectAsync(string.Join(",", WhererVisitor.GetColumnNames(expression)));
return(data);
}
/// <summary>
/// 查询单个数据:指定查询列
/// </summary>
/// <param name="expression">字段列表</param>
/// <returns></returns>
public T Single(Expression <Func <T, object> > expression)
{
var data = Single(string.Join(",", WhererVisitor.GetColumnNames <T>(expression)));
return(data);
}
/// <summary>
/// 查询数据:指定字段列表
/// </summary>
/// <param name="expression">字段列表</param>
/// <returns></returns>
public List <T> Select(Expression <Func <T, object> > expression)
{
var data = Select(string.Join(",", WhererVisitor.GetColumnNames(expression)));
return(data);
}
