如何使用 VB Net 将数据插入 SQL Server

Question

我是vb.net的新手，我需要使用vb.net在表格中插入数据，请任何人帮忙

我试过了

这里我尝试了示例代码

我得到了这个异常Column name or number of supplied values does not match table definition. 谢谢提前

Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As  System.EventArgs)  Handles btnSave.Click

    Dim strName As String = txtName.Text
    Dim strId As String = txtID.Text
    Dim strPhone As String = txtPhone.Text
    Dim strBranch As String = cmboxBranch.SelectedItem.ToString()
    Dim  strCourse As String = cmbboxCourse.SelectedItem.ToString()
    Dim dblFee As Double = Double.Parse(txtFee.Text) 

    Dim strCommand As String = "insert into student values('" & strName & "','" & strId &    "','" & strPhone & "','" & strBranch & "','" & strCourse & "'," & dblFee & ")"

    Dim command As SqlCommand = New SqlCommand(strCommand, connection)
    command.CommandType = CommandType.Text

    '' MsgBox(strCommand) 

    connection.Open()
    If (command.ExecuteNonQuery().Equals(1)) Then
        MsgBox("Information stored in database")
    Else
        MsgBox("Not stored in database")
    End If

End Sub

Answer 1

这意味着在INSERT 语句的VALUES 子句中指定的值的数量不等于表中的总列数。如果您只尝试在选定的列上插入，则必须指定列名。

另一个，因为您使用的是ADO.Net，所以总是参数化您的查询以避免SQL Injection。你现在正在做的是击败sqlCommand的使用。

前

Dim query as String = String.Empty
query &= "INSERT INTO student (colName, colID, colPhone, "
query &= "                     colBranch, colCourse, coldblFee)  "
query &= "VALUES (@colName,@colID, @colPhone, @colBranch,@colCourse, @coldblFee)"

Using conn as New SqlConnection("connectionStringHere")
    Using comm As New SqlCommand()
        With comm
            .Connection = conn
            .CommandType = CommandType.Text
            .CommandText = query
            .Parameters.AddWithValue("@colName", strName)
            .Parameters.AddWithValue("@colID", strId)
            .Parameters.AddWithValue("@colPhone", strPhone)
            .Parameters.AddWithValue("@colBranch", strBranch)
            .Parameters.AddWithValue("@colCourse", strCourse)
            .Parameters.AddWithValue("@coldblFee", dblFee)
        End With
        Try
            conn.open()
            comm.ExecuteNonQuery()
        Catch(ex as SqlException)
            MessageBox.Show(ex.Message.ToString(), "Error Message")
        End Try
    End Using
End USing 

PS：请将查询中指定的列名更改为在您的表中找到的原始列。

Answer 2

Imports System.Data

Imports System.Data.SqlClient

Public Class Form2

Dim myconnection As SqlConnection

Dim mycommand As SqlCommand

Dim dr As SqlDataReader

Dim dr1 As SqlDataReader

Dim ra As Integer


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click


    myconnection = New SqlConnection("server=localhost;uid=root;pwd=;database=simple")

    'you need to provide password for sql server

    myconnection.Open()

    mycommand = New SqlCommand("insert into tbl_cus([name],[class],[phone],[address]) values ('" & TextBox1.Text & "','" & TextBox2.Text & "','" & TextBox3.Text & "','" & TextBox4.Text & "')", myconnection)

    mycommand.ExecuteNonQuery()

    MessageBox.Show("New Row Inserted" & ra)

    myconnection.Close()

End Sub

End Class

Answer 3

Function ExtSql(ByVal sql As String) As Boolean
    Dim cnn As SqlConnection
    Dim cmd As SqlCommand
    cnn = New SqlConnection(My.Settings.mySqlConnectionString)
    Try
        cnn.Open()
        cmd = New SqlCommand
        cmd.Connection = cnn
        cmd.CommandType = CommandType.Text
        cmd.CommandText = sql
        cmd.ExecuteNonQuery()
        cnn.Close()
        cmd.Dispose()
    Catch ex As Exception
        cnn.Close()
        Return False
    End Try
    Return True
End Function