Question

C# winform 怎么测试mysql数据库是否可以连通

Answer 1

官网站载Mysql.Data.dll项目添加该组件引用代码页输入using Mysql.Data.MysqlClient我顺利使用该类库函数建立连接

几用函数：

#region 建立MySql数据库连接
/// <summary>
/// 建立数据库连接.
/// </summary>
/// <returns>返MySqlConnection象</returns>
public MySqlConnection getmysqlcon()
{
string M_str_sqlcon = "server=localhost;user id=root;password=root;database=abc"; //根据自设置
MySqlConnection myCon = new MySqlConnection(M_str_sqlcon);
return myCon;
}
#endregion

#region 执行MySqlCommand命令
/// <summary>
/// 执行MySqlCommand
/// </summary>
/// <param name="M_str_sqlstr">SQL语句</param>
public void getmysqlcom(string M_str_sqlstr)
{
MySqlConnection mysqlcon = this.getmysqlcon();
mysqlcon.Open();
MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);
mysqlcom.ExecuteNonQuery();
mysqlcom.Dispose();
mysqlcon.Close();
mysqlcon.Dispose();
}
#endregion

#region 创建MySqlDataReader象
/// <summary>
/// 创建MySqlDataReader象
/// </summary>
/// <param name="M_str_sqlstr">SQL语句</param>
/// <returns>返MySqlDataReader象</returns>
public MySqlDataReader getmysqlread(string M_str_sqlstr)
{
MySqlConnection mysqlcon = this.getmysqlcon();
MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);
mysqlcon.Open();
MySqlDataReader mysqlread = mysqlcom.ExecuteReader(CommandBehavior.CloseConnection);
return mysqlread;
}
#endregion

追问

是直接Open()一下 看看是否可以打开？还是直接随便查询一下数据看？

Answer 2

C#连接mysql用法与sqlclient里的自带函数一样。

注意：要在添加引用里引用 Mysql.Data

具体代码如下

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//using MySQLDriverCS;
using System.Data.SqlClient;
using MySql.Data.MySqlClient;

namespace importTxtToMysql
{
    public partial class Form2 : Form
    {
        private DataSet dsall;
        //private static String mysqlcon = "Data Source=MySQL;database=onepc;Password=;User ID=root;Location=192.168.1.168;charset=utf8";
        private static String mysqlcon = "database=onepc;Password=;User ID=root;server=192.168.1.168";//Data Source=MySQL;;charset=utf8";
        private MySqlConnection conn;
        private MySqlDataAdapter mdap;
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            try
            {
               // MySqlCommand cmd = new MySqlCommand("select ");
                mdap = new MySqlDataAdapter("select * from allhard",conn);
                dsall = new DataSet();
                mdap.Fill(dsall,"hard");
                dataGridView1.DataSource = dsall.Tables["hard"];
 

            }
            catch (Exception ex)
            {
                 MessageBox.Show(ex.Message);
            }
            finally
            {
               
            }
            
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            conn = new MySqlConnection(mysqlcon);
        }
    }
}