/// <summary> /// 获取最小值 /// </summary> /// <typeparam name="T">实体类型</typeparam> /// <param name="queryable">查询对象</param> /// <param name="expression">查询字段 (例如:it=>it.fieldName)</param> /// <returns>object</returns> public static object Min <T>(this Queryable <T> queryable, Expression <Func <T, object> > expression) { ResolveExpress re = new ResolveExpress(); var minField = re.GetExpressionRightField(expression, queryable.DB); return(Min <T, object>(queryable, minField)); }
/// <summary> /// 条件筛选 ( 例如:expression 为 it=>it.id, inValues值为 new string[]{"1" ,"2"} 生成的SQL就是 id in('1','2') ) /// </summary> /// <typeparam name="T">表实体类型</typeparam> /// <typeparam name="FieldType">In的字段类型</typeparam> /// <param name="queryable">查询对象</param> /// <param name="expression">In的字段(例如:it=>it.id)</param> /// <param name="inValues">In的值的集合</param> /// <returns>Queryable</returns> public static Queryable <T> In <T, FieldType>(this Queryable <T> queryable, Expression <Func <T, object> > expression, List <FieldType> inValues) { ResolveExpress re = new ResolveExpress(); var InFieldName = re.GetExpressionRightField(expression, queryable.DB); return(In <T, FieldType>(queryable, InFieldName, inValues)); }
/// <summary> /// 分组 /// </summary> /// <typeparam name="T">表实体类型</typeparam> /// <param name="queryable">查询对象</param> /// <param name="expression">分组字段 (例如:it=>it.fieldName)</param> /// <returns>Queryable</returns> public static Queryable <T> GroupBy <T>(this Queryable <T> queryable, Expression <Func <T, object> > expression) { ResolveExpress re = new ResolveExpress(); var field = re.GetExpressionRightField(expression, queryable.DB); var pre = queryable.GroupByValue.IsValuable() ? "," : ""; queryable.GroupByValue += pre + field; return(queryable); }
/// <summary> /// 排序 /// </summary> /// <typeparam name="T">表实体类型</typeparam> /// <param name="queryable">查询对象</param> /// <param name="expression">排序字段 it=>it.fieldName </param> /// <param name="type">排序类型</param> /// <returns>Queryable</returns> public static Queryable <T> OrderBy <T>(this Queryable <T> queryable, Expression <Func <T, object> > expression, OrderByType type = OrderByType.asc) { ResolveExpress re = new ResolveExpress(); var field = re.GetExpressionRightField(expression, queryable.DB); if (queryable.JoinTableValue.IsValuable()) { field = re.GetExpressionRightFieldByNT(expression, queryable.DB); } var pre = queryable.OrderByValue.IsValuable() ? "," : ""; queryable.OrderByValue += pre + field + " " + type.ToString().ToUpper(); return(queryable); }