根据来自 vb.net 中另一个 SQL 服务器 table 的显示行显示列

Question

如何在VB.NET中将行数据值显示为列名？

给定一些 table 结构。

Table 1 及其原始列和示例数据：

RECEIPTNO    PIZZA   NOODLES  BURGER   BEVERAGES
--------------------------------------------------
  100          35      0        12          5

Table 2 其中只有 2 行数据：

FOODNAME  FOODTYPE
------------------
NOODLES    ASIAN FOOD
BEVERAGES  BEVERAGES

预计 Table 1 将在 table 处的每一行显示食物名称 2.

RECEIPTNO  NOODLES  BEVERAGES
------------------------------
   100       0          5

Answer 1

首先，我从 Table2 下载以从 Table1 中获取您想要的列。遍历结果构建 SELECT 语句。

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    Dim dt As New DataTable
    Dim dt2 As New DataTable
    Using cn As New SqlConnection("Your connection string")
        Using cmd As New SqlCommand("SELECT FOODNAME FROM Table2;", cn)
            cn.Open()
            dt.Load(cmd.ExecuteReader)
            cn.Close()
        End Using

        Dim sqlSelect = "SELECT RECEIPTNO"
        For Each row As DataRow In dt.Rows
            sqlSelect &= "," & row("FOODNAME").ToString
        Next
        sqlSelect &= " FROM Table1;"
        Using cmd As New SqlCommand(sqlSelect, cn)
            cn.Open()
            dt2.Load(cmd.ExecuteReader)
        End Using
    End Using
    DataGridView1.DataSource = dt2
End Sub

根据来自 vb.net 中另一个 SQL 服务器 table 的显示行显示列

Display column based on the displayed row from another SQL Server table in vb.net

vb.net

sql-server-2008-r2