0

VB.NET で SQL ステートメントを使用して db テーブルにデータを挿入しようとしています。

これは私のコードです：

登録.aspx:

Imports dbConnect
Imports System.Data.SqlClient


Partial Class Registration
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load

    End Sub

    Protected Sub btnRegister_Click(sender As Object, e As EventArgs) Handles btnRegister.Click

        register()


    End Sub


    Public Sub register()



        Dim Username As String = txtUsername.ToString
        Dim Surname As String = txtSurname.ToString
        Dim Password As String = txtPassword.ToString
        Dim Name As String = txtName.ToString
        Dim Address1 As String = txtAddress1.ToString
        Dim Address2 As String = txtAddress2.ToString
        Dim City As String = txtCity.ToString
        Dim Email As String = txtEmail.ToString
        Dim Country As String = drpCountry.ToString
        Dim DOB As Date = calDOB.SelectedDate
        Dim Occupation As String = txtOccupation.ToString
        Dim WorkLocation As String = txtWorkLocation.ToString
        Dim Age As Integer = "20"

        Dim ProjectManager As String = "test"
        Dim TeamLeader As String = "test"
        Dim TeamLeaderID As Integer = 1
        Dim ProjectManagerID As Integer = 1

        Dim RegistrationDate As Date = Today
        Dim ContractType As String = "test"
        Dim ContractDuration As Integer = 6
        Dim Department As String = "test"
        Dim conn As New SqlConnection("Data Source=BRIAN-PC\SQLEXPRESS;Initial Catalog=master_db;Integrated Security=True")
        Dim registerSQL As SqlCommand
        Dim sqlComm As String

        sqlComm = "INSERT INTO users(Username, Password, Name, Surname, Address1, Address2, City, Country, date_of_birth, age, Occupation, department, work_location, project_manager,team_leader, team_leader_id, project_manager_id, date_registration, contract_type, contract_duration) VALUES('" + Username + "','" + Password + "','" + Name + "','" + Surname + "','" + Address1 + "','" + Address2 + "','" + City + "','" + Country + "','" + DOB + "','" + Age + "','" + Occupation + "','" + Department + "','" + WorkLocation + "','" + ProjectManager + "','" + TeamLeader + "','" + TeamLeaderID + "','" + ProjectManager + "','" + RegistrationDate + "','" + ContractType + "','" + ContractDuration + "')"

        conn.Open()

        registerSQL = New SqlCommand(sqlComm, conn)

        registerSQL.ExecuteNonQuery()
        conn.Close()


    End Sub



End Class

これは私のデータベースの「ユーザー」テーブルです：

ユーザー テーブル

次のエラー メッセージが表示されます。

Error   1   Operator '+' is not defined for types 'Double' and 'Date'.  C:\Users\Brian\Documents\Visual Studio 2012\WebSites\WebSite1\Registration.aspx.vb  51  19  WebSite1(1)

誰が何が起こっているのか教えてもらえますか?

4

2 に答える 2

3

ロイドが指摘したように、クエリをパラメータ化します。例 (読みやすくするために短縮)

sqlComm = "INSERT INTO users(Username, Password, Name) VALUES(@Username, @Password, @Name)"
registerSQL = New SqlCommand(sqlComm, conn)
registerSQL.Parameters.AddWithValue("@Username", Username)
registerSQL.Parameters.AddWithValue("@Password", Password)
registerSQL.Parameters.AddWithValue("@Name", Name)

しかし、あなたの質問に答えるには、文字列を連結する&代わりに使用します。+

于 2013-03-25T20:07:59.317 に答える
0

あなたに出発点を与えるだけです

  sqlComm = "INSERT INTO users(Username, Password, Name, Surname, Address1, Address2, " + 
            "City, Country, date_of_birth, age, Occupation, department, work_location, " + 
            "project_manager,team_leader, team_leader_id, project_manager_id, " + 
            "date_registration, contract_type, contract_duration) " + 
            "VALUES(@p1, @p2,@p3,@p4,@p5,@p6,@p7,@p8,@p9,@p10,@p11,@p12,@p13,@p14,@p15," +
            "@p16,@p17,@p18,@p19,@p20)"
    conn.Open()
    registerSQL = New SqlCommand(sqlComm, conn)
    registerSQL.Parameters.AddWithValue("@p1", Username)
    ..... 
    registerSQL.ExecuteNonQuery()

また、AddWithValue メソッドに渡す値が文字列でない場合は、データベース フィールドが期待する正しいデータ型に変換してみてください。

    registerSQL.Parameters.AddWithValue("@p9", Convert.ToDateTime(DOB))

このようにして、二重引用符で文字列を解析したり、文字列を日付に自動変換したりすることを心配する必要はありません。さらに、Sql インジェクション攻撃の問題もありません。

于 2013-03-25T20:10:52.153 に答える