使用 sqlite 导入删除 vb 中的 sqlite 行

Question

我已经在我的 vb 项目中成功安装了 sqlite import，并且我能够从 .sqlite file.However 中获取数据，当我尝试从同一个文件中删除一行时，我没有任何错误，但也没有任何结果（它不起作用）。该文件不是只读的。所以，基本上我希望代码使用 vb 和 sqlite 导入从 sqlite 文件中删除一行。

我使用的代码：

Private Sub DelBtn_Click(sender As Object, e As EventArgs) Handles DelBtn.Click
    Me.Delete("places", "date = '10/06/2016'")
End Sub

Public Function ExecuteNonQuery(sql As String) As Integer
    Dim cnn As New SQLiteConnection("Data Source=C:\file.sqlite")
    cnn.Open()
    Dim mycommand As New SQLiteCommand(cnn)
    mycommand.CommandText = sql
    Dim rowsUpdated As Integer = mycommand.ExecuteNonQuery()
    cnn.Dispose()
    cnn.Close()
    Return rowsUpdated
End Function

Public Function Delete(tableName As [String], where As [String]) As Boolean
    Dim returnCode As [Boolean] = True
    Try
        Me.ExecuteNonQuery([String].Format("delete from {0} where {1};", tableName, where))
    Catch fail As Exception
        MessageBox.Show(fail.Message)
        returnCode = False
    End Try
    Return returnCode
End Function

Answer 1

您认为查询相同的假设是错误的。

也就是说，这是一个使用您的 SQL 作为参考的参数化查询示例。

Public Function DeleteFromPlacesByDate(dt As DateTime) As Integer
    Dim rowsUpdated As Integer = 0
    Using connection As New SQLiteConnection("Data Source=C:\file.sqlite")
        connection.Open()
        'SQL with parameter included.
        Dim sql As String = "DELETE FROM places WHERE date = @date"
        'create command to execute sql query on connection
        Dim command As New SQLiteCommand(sql, connection)
        'add parameter and value
        command.Parameters.AddWithValue("@date", dt)
        'Call Prepare after setting the Commandtext and Parameters.
        command.Prepare()
        'execute command
        rowsUpdated = command.ExecuteNonQuery()
        connection.Close()        
    End Using
    Return rowsUpdated
End Function

你也应该看看SQL As Understood By SQLite: Date And Time Functions

A time string can be in any of the following formats:

YYYY-MM-DD
YYYY-MM-DD HH:MM
YYYY-MM-DD HH:MM:SS
YYYY-MM-DD HH:MM:SS.SSS
YYYY-MM-DDTHH:MM
YYYY-MM-DDTHH:MM:SS
YYYY-MM-DDTHH:MM:SS.SSS
HH:MM
HH:MM:SS
HH:MM:SS.SSS
now
DDDDDDDDDD

使用 sqlite 导入删除 vb 中的 sqlite 行

Delete sqlite row in vb with sqlite import

vb.net

sqlite

delete-row