SQLite 命令？

Question

我正在尝试使用 xamarin 创建登录页面

public bool Login(string Username, string Password)
    {
        Users _user = new Users();
        string mySelectQuery = "SELECT Name, Password FROM Users WHERE Name='" + Username + "' AND Password='" + Password + "'";

        var user = new SQLiteCommand(mySelectQuery);

        if (user != null)
        {
            return true;
        }

        return false;
    }

在 SQLiteCommand 部分给出错误。错误是 CS1729 Does not contain a constructor that takes 1 arguments 我在网上查了一下，但我没明白我是新手。

Answer 1

你使用 SQLiteCommand class，并且包含一个参数，它应该是 SQLiteConnection，这里是关于这个的示例：

public bool Login(string Username, string Password)
    {

        string dbName = "Data Source=searchindex.db";
        string mySelectQuery = "SELECT Count(*) FROM Users WHERE Name='" + Username + "' AND Password='" + Password + "'";

        SQLiteConnection con = new SQLiteConnection(dbName);
        SQLiteCommand cmd = new SQLiteCommand(con);
        cmd.CommandText = mySelectQuery;

        var count = cmd.ExecuteScalar<int>();
        if (count>0)
        {
            return true;
        }

        return false;
    }

SQLite 命令？

SQLite Command?

xamarin

sqlite.net