OleDB Select 命令不适用于多个 OR 语句（C#）

Question

我正在使用下面的 select 语句从 excel 中提取数据并将其放入数据表中。那里有一个我不想接的坏行，所以这就是这部分 [Plan] 'PLAN_BO' 但是它不适用于其他两个 OR 语句。 [Plan] 应该是一个日期时间列，但有一个额外的文本行。

[Plan] 'PLAN_BO' 或 [Plan] 的组合是 null 一起工作，但不是三个一起工作。

 comm.CommandText = "Select Category, [Project ID], Package, [Design ID], LLW, Bldg, School, [Project Description], [Doc Avail], [Plan] from [ca_rpt$] where [Plan] <> 'PLAN_BO' or [Plan] is null or [Plan] >= DATE() order by Category, [Project ID], Package, [Design ID], LLW";

有没有办法抵消第一行，因为那是坏行，但不是列标题。我在语句末尾尝试了 Offset 1 Row，但它不起作用。

编辑：当前状态

(ISDATE([Bid Open Plan]) and [Bid Open Plan] >= DATE()) or [Bid Open Plan] 为空

[开标计划] >= DATE() 被忽略。

 using (OleDbConnection conn = new OleDbConnection())
            {
                System.Data.DataTable dt = new System.Data.DataTable();
                conn.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";" + "Extended Properties='Excel 12.0 Xml;HDR=YES;IMEX=1'";
                using (OleDbCommand comm = new OleDbCommand())
                {
                    comm.CommandText = "Select Category, [Project ID], Package, [Design ID], LLW, Bldg, School, [Project Description], [Pkg#], [Doc Available], [Bid Open Plan] from(Select Category, [Project ID], Package, [Design ID], LLW, Bldg, School, [Project Description], [Pkg#], [Doc Available], [Bid Open Plan] from [ca_rpt$] where ISDATE([Bid Open Plan]) or [Bid Open Plan] is null) Where [Bid Open Plan] >= DATE() order by Mincat, Minse, [Pkg#], [Project ID], Package, [Design ID], LLW";
                    comm.Connection = conn;
                    using (OleDbDataAdapter da = new OleDbDataAdapter())
                    {
                        da.SelectCommand = comm;
                        da.Fill(dt);

Answer 1

您可能需要检查列值是否为有效日期。您可以使用ISDATE 检查该值是否为有效日期并仅返回有效日期。

  Select Category, [Project ID], Package, [Design ID], LLW, Bldg, School, 
    [Project Description], [Doc Avail], [Bid Open Plan] 

    FROM(
          Select Category, [Project ID], Package, [Design ID], LLW, Bldg, School, [Project Description], [Doc Avail], [Bid Open Plan]
          from [ca_rpt$]
          where ISDATE([Bid Open Plan]) =1 or [Bid Open Plan] is null 
    )
    WHERE [Bid Open Plan]>=Date()
    order by Category, [Project ID], Package, [Design ID], LLW

查看此链接Documentation on ISDATE()