Question

我正在使用用户输入数据库连接信息的表单，然后将其存储在类dbConStr中的多个字符串中，然后从实际连接表单构建和引用。

这是类文件：

class dbConStr
{
    public static String strServer;
    public static String strPort;
    public static String strDatabase;
    public static String strUid;
    public static String strPwd;

    public static String strConnect = strServer + strPort + strDatabase + strUid + strPwd;
}

这是将值分配给字符串的按钮：

    private void btnStoreCon_Click(object sender, EventArgs e)
    {
        dbConStr.strServer = "Server="+txtServer.Text+";";
        dbConStr.strPort = "Port=" + txtPort.Text + ";";
        dbConStr.strDatabase = "Database=" + txtDatabase.Text + ";";
        dbConStr.strUid = "Uid=" + txtUsername.Text + ";";
        dbConStr.strPwd = "Pwd=" + txtPassword.Text + ";";
    }

我收到的错误是无法连接到指定的MySQL主机。

Answer 1

您可以使用MySqlConnectionStringBuilder创建连接字符串。

MySqlConnectionStringBuilder conn_string = new MySqlConnectionStringBuilder();
conn_string.Server = "localhost";
conn_string.UserID = "user";
conn_string.Password = "password";
conn_string.Database = "test_db";
var connectionString = conn_string.ToString();

或尝试这样的事情：

class dbConStr
{
    public static String strServer;
    public static String strPort;
    public static String strDatabase;
    public static String strUid;
    public static String strPwd;

    public static string ConnectionString
    {
        MySqlConnectionStringBuilder conn_string = new MySqlConnectionStringBuilder();
        conn_string.Server = dbConStr.strServer;
        conn_string.UserID = dbConStr.strUid;
        conn_string.Password = dbConStr.strPwd;
        conn_string.Database = dbConStr.strDatabase;
        conn_string.Port = dbConStr.strPort;

        return conn_string.ToString();
    }
}

Answer 2

你需要

using MySql.Data.MySqlClient;






    private void btnStoreCon_Click(object sender, EventArgs e)
    {
        MySqlConnection connection;
        string server;
        string database;
        string uid;
        string password;

        server = txtServer.Text;
        database = txtDatabase.Text;
        uid =  txtUsername.Text;
        password =txtPassword.Text;
        string connectionString;
        connectionString = "SERVER=" + server + ";" + "DATABASE=" + 
        database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";";

        connection = new MySqlConnection(connectionString);
    }

更多信息可以在http://www.codeproject.com/Articles/43438/Connect-C-to-MySQL

找到

Answer 3

    private void btnStoreCon_Click(object sender, EventArgs e)
    {
        dbConStr.strServer = "Server=" + txtServer.Text + ";";
        dbConStr.strPort = "Port=" + txtPort.Text + ";";
        dbConStr.strDatabase = "Database=" + txtDatabase.Text + ";";
        dbConStr.strUid = "Uid=" + txtUsername.Text + ";";
        dbConStr.strPwd = "Pwd=" + txtPassword.Text + ";";

        dbConStr.strConnect = dbConStr.strServer + dbConStr.strPort + dbConStr.strDatabase + dbConStr.strUid + dbConStr.strPwd;
    }

我需要在按钮点击事件

中创建字符串

从用户输入存储变量中的MySQL连接字符串然后构建字符串[C＃]

3 个答案: