Question

我有一个100万行的SQLite数据库。显然，DGV在显示大量记录时失败了。所以我实现了分页，一次只显示50k条记录。

这很有效，但如果我想立即对DB中的所有数据进行处理/更新，我还没有找到解决方案，我一次只能做50k记录。我是否需要为每个块调用GetPage，进行处理，然后以编程方式移动到下一页，直到它们都没有剩下？我想DataReader会合适吗？

另外，使用分页，如果我从第1页中选择包含50k行的某些行，我也无法在DGV中选择第2页中的任何行，对吗？

Private connString As String = "Data Source=data.s3db;Version=3"
Private dt As DataTable
Private pageNumber As Integer
Private pageSize As Integer = 50000
Private adapter As SQLiteDataAdapter

Private Sub btnNext_Click(sender As Object, e As EventArgs) Handles btnNext.Click
    pageNumber += 1
    dt = GetPage(pageNumber * pageSize, pageSize)
    DataGridView1.DataSource = dt
End Sub

Private Sub btnPrevious_Click(sender As Object, e As EventArgs) Handles btnPrevious.Click
    pageNumber -= 1
    dt = GetPage(pageNumber * pageSize, pageSize)
    DataGridView1.DataSource = dt
End Sub

Public Function GetPage(startIndex As Integer, pageSize As Integer)
    Dim table As New DataTable
    Using adapter As New SQLiteDataAdapter("SELECT * FROM test LIMIT " & pageSize & " OFFSET " & startIndex, connString)
        adapter.Fill(table)
    End Using
    Return table
End Function

VB.Net DGV +分页问题

0 个答案: