mysql - 使用参数时mysql语法错误

Question

当我使用参数时，我一直被告知我的 mysql 语法中有错误。

这是我的代码：

    Dim db As New Database

    Dim sql As String = "select firstname, password from users where email = :email"

    Dim args As New List(Of MySqlParameter)
    args.Add(New MySqlParameter(":email", txtEmail.Text))

    ' execDB(procedurename As String, proceduretype As String, parameters() as MySqlParameter, returntype As String, newconnection As Boolean)

    Dim dr As MySqlDataReader = db.execDB(sql, "Text", args.ToArray, "DataReader", False)

错误表明这:email不是有效值。我不明白为什么它不使用参数，因为我将它传递给execDB函数。

在此先感谢您的帮助。

Answer 1

使用?param 语法，

Dim sql As String = "select firstname, password from users where email = ?email"