我正在制作一个应用程序来查找数据网格的值是否在表 1 中，然后在表 2 上更新数据网格填充是表 2 我的代码正在运行，但需要 1 分钟或更长时间才能完成 1 行，是否有任何代码可以使我的应用程序运行得更快？
这是我的代码：
Imports System.Data.OleDb
Imports System.Data.SqlClient
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim sql As String = "select date,npk,nama,masuk,out,h_ot,flag,status from lemburapril"
Dim dataadapter As New SqlDataAdapter(sql, str)
str.Open()
Dim ds As New DataSet()
dataadapter.Fill(ds, "ds")
str.Close()
DataGridView1.DataSource = ds
DataGridView1.DataMember = "ds"
For i = 0 To ds.Tables(0).Rows.Count - 1
Dim tgl As Date = ds.Tables(0).Rows(i).Item(0).ToString
Dim npk As String = ds.Tables(0).Rows(i).Item(1).ToString
Dim nama As String = ds.Tables(0).Rows(i).Item(2).ToString
Dim masuk As String = ds.Tables(0).Rows(i).Item(3).ToString
Dim out As String = ds.Tables(0).Rows(i).Item(4).ToString
Dim h_ot As String = ds.Tables(0).Rows(i).Item(5).ToString
Dim Flag As String = ds.Tables(0).Rows(i).Item(6).ToString
Dim status As String = ds.Tables(0).Rows(i).Item(7).ToString
For Each Rows In DataGridView1.Rows
Dim sqlup As String = "update lemburapril set status = 'v' where date = any (select date from ABY1904$ where date ='" & tgl & "') and npk = any (select npk from ABY1904$ where npk = '" & npk & "')"
str.Open()
COMMANDSQL(sqlup)
str.Close()
Next
Next
End Sub
Public Sub display()
Dim sql As String = "select date,npk,nama,masuk,out,h_ot,flag,status from lemburapril"
Dim dataadapter As New SqlDataAdapter(Sql, str)
str.Open()
Dim ds As New DataSet()
dataadapter.Fill(ds, "ds")
str.Close()
DataGridView1.DataSource = ds
DataGridView1.DataMember = "ds"
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
display()
End Sub
End Class
这是我的连接：
Module koneksi
Dim sqlcom As New SqlCommand
Dim commansql As String
Public str As New SqlConnection("data source= Somebody-PC\SQLEXPRESS ;initial catalog= lembur ;integrated security =true")
Public Sub COMMANDSQL(ByVal S As String)
sqlcom = New SqlCommand(S, str)
sqlcom.CommandType = CommandType.Text
sqlcom.ExecuteNonQuery()
End Sub
End Module
摆脱模块。将所有数据库对象保持在本地，以便您可以关闭和处置它们。即使出现错误，Using...End Using 块也会处理这个问题。看起来您正在遍历所有行并为嵌套 for 中的每一行再次运行更新。这会给你 n*n ，这会减慢速度。
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
display()
End Sub
Private ConnString As String = "data source= Somebody-PC\SQLEXPRESS ;initial catalog= lembur ;integrated security =true"
Private dt As New DataTable
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Using Str As New SqlConnection(ConnString)
Using cmd As New SqlCommand("Update lemburapril Set status = 'v' Where date = any (Select date From ABY1904$ Where date =@tgl) And npk = any (Select npk From ABY1904$ Where npk = @npk)", Str)
cmd.Parameters.Add("@tgl", SqlDbType.Date)
cmd.Parameters.Add("@npk", SqlDbType.VarChar)
Str.Open()
For i = 0 To dt.Rows.Count - 1
cmd.Parameters("@tgl").Value = CDate(dt.Rows(i).Item(0))
cmd.Parameters("@npk").Value = dt.Rows(i).Item(1).ToString
cmd.ExecuteNonQuery()
Next
End Using
End Using
End Sub
Public Sub display()
Using Str As New SqlConnection(ConnString)
Using cmd As New SqlCommand("select date,npk,nama,masuk,[out],h_ot,flag,status from lemburapril", Str)
Str.Open()
dt.Load(cmd.ExecuteReader)
End Using
End Using
DataGridView1.DataSource = dt
End Sub
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