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vb如何讀取sql數(shù)據(jù)庫數(shù)據(jù)

小億
123
2024-04-19 16:18:12
欄目: 云計算

在VB中讀取SQL數(shù)據(jù)庫數(shù)據(jù)可以使用ADO.NET技術(shù)。以下是一個簡單示例代碼：

  1. 引用System.Data.SqlClient命名空間
Imports System.Data.SqlClient
  1. 創(chuàng)建數(shù)據(jù)庫連接對象并打開連接
Dim connStr As String = "Data Source=myServerAddress;Initial Catalog=myDatabase;User ID=myUsername;Password=myPassword;"
Dim conn As New SqlConnection(connStr)
conn.Open()
  1. 創(chuàng)建SQL查詢語句并執(zhí)行
Dim query As String = "SELECT * FROM myTable"
Dim cmd As New SqlCommand(query, conn)
Dim reader As SqlDataReader = cmd.ExecuteReader()
  1. 讀取數(shù)據(jù)
While reader.Read()
    Dim value1 As String = reader("column1").ToString()
    Dim value2 As Integer = CInt(reader("column2"))
    '處理讀取到的數(shù)據(jù)
End While
  1. 關(guān)閉連接和釋放資源
reader.Close()
conn.Close()
conn.Dispose()

以上示例代碼演示了如何連接到數(shù)據(jù)庫，執(zhí)行查詢語句并讀取數(shù)據(jù)。在實際應(yīng)用中，可以根據(jù)具體需求修改查詢語句和處理讀取數(shù)據(jù)的邏輯。

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