Winform中连接Mysql8并查询表中数据进行显示

以你之姓@ 2022-09-12 04:41 69阅读 0赞

# 场景 #

在Winform中连接mysql数据库，并查询某个表中的所有数据，在datagridview中显示数据。

在连接之前，需要先搭建mysql8的数据库环境。

Docker中部署Mysql8数据库：

[Docker中部署Mysql8数据库\_BADAO\_LIUMANG\_QIZHI的博客-CSDN博客][Docker_Mysql8_BADAO_LIUMANG_QIZHI_-CSDN]

注：

博客：  
[BADAO\_LIUMANG\_QIZHI的博客\_CSDN博客][BADAO_LIUMANG_QIZHI_CSDN]  
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# 实现 #

1、新建Winform项目

依赖项右键-管理Nuget程序包-搜索Mysql.Data

然后安装，这里连接的是Mysql8,所以选择Mysql.Data为最新稳定版8.0.26进行安装

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAQkFEQU9fTElVTUFOR19RSVpISQ_size_20_color_FFFFFF_t_70_g_se_x_16][]

安装时需要进行确认

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAQkFEQU9fTElVTUFOR19RSVpISQ_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

2、设计Winform窗体

设计Winform窗体如下

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAQkFEQU9fTElVTUFOR19RSVpISQ_size_20_color_FFFFFF_t_70_g_se_x_16 2][]依次设置数据库的ip地址和用户名、密码以及数据库的名字，这样就能建立连接了，然后再输入表的名字，就能查询该表的数据并

在下面的datagridview中显示。

3、建立连接与关闭连接

首先声明连接字符串和连接对象以及数据库的相关参数

string connetStr = String.Empty;
            MySqlConnection mySqlConnection = null;
            String hostaddress = String.Empty;
            String databaseName = String.Empty;
            String name = String.Empty;
            String pass= String.Empty;

然后在建立连接按钮的点击事件中

private void connection_Click(object sender, EventArgs e)
            {
                hostaddress = this.host.Text.Trim();
                databaseName = this.database.Text.Trim();
                name = this.username.Text.Trim();
                pass = this.password.Text.Trim();
                connetStr = "server= "+hostaddress+";UserId="+name+";password="+pass+";database="+databaseName; //localhost不支持ssl连接时，最后一句一定要加！！！
                mySqlConnection= new MySqlConnection(connetStr);
                try
                {
                    mySqlConnection.Open(); //连接数据库
                    MessageBox.Show("数据库连接成功", "提示", MessageBoxButtons.OK);
                 
                }
                catch (MySqlException ex)
                {
                    MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK);     //显示错误信息
                }
            }

在关闭连接的按钮的事件中

private void button2_Click(object sender, EventArgs e)
            {
                mySqlConnection.Close();
            }

4、查询表中所有数据并展示

在查询表所有数据的按钮点击事件中

private void button1_Click(object sender, EventArgs e)
            {
                string searchStr = "select * from "+this.tablename.Text;
                MySqlDataAdapter adapter = new MySqlDataAdapter(searchStr, mySqlConnection);
                DataSet dataSet = new DataSet();
                adapter.Fill(dataSet, "table1");
                this.dataGridView1.DataSource = dataSet.Tables["table1"];
            }

查询指定表的所有数据然后赋值给dataGridView作为数据源

5、连接并查询数据

运行程序，输入数据的相关参数等，点击连接按钮

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAQkFEQU9fTElVTUFOR19RSVpISQ_size_20_color_FFFFFF_t_70_g_se_x_16 3][]然后输入数据库中某个表名，点击查询表所有数据

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAQkFEQU9fTElVTUFOR19RSVpISQ_size_20_color_FFFFFF_t_70_g_se_x_16 4][]

6、完整示例代码

using System;
    using System.Data;
    using System.Windows.Forms;
    using System.Windows.Forms.VisualStyles;
    using MySql.Data.MySqlClient;
    namespace mysqldatabak
    {
        public partial class Form1 : Form
        {
            string connetStr = String.Empty;
            MySqlConnection mySqlConnection = null;
            String hostaddress = String.Empty;
            String databaseName = String.Empty;
            String name = String.Empty;
            String pass= String.Empty;
            public Form1()
            {
                InitializeComponent();
            }
    
            private void connection_Click(object sender, EventArgs e)
            {
                hostaddress = this.host.Text.Trim();
                databaseName = this.database.Text.Trim();
                name = this.username.Text.Trim();
                pass = this.password.Text.Trim();
                connetStr = "server="+ hostaddress+";User Id="+name+";password="+pass+";database="+databaseName; //localhost不支持ssl连接时，最后一句一定要加！！！
                mySqlConnection= new MySqlConnection(connetStr);
                try
                {
                    mySqlConnection.Open(); //连接数据库
                    MessageBox.Show("数据库连接成功", "提示", MessageBoxButtons.OK);
                 
                }
                catch (MySqlException ex)
                {
                    MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK);     //显示错误信息
                }
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                string searchStr = "select * from "+this.tablename.Text;
                MySqlDataAdapter adapter = new MySqlDataAdapter(searchStr, mySqlConnection);
                DataSet dataSet = new DataSet();
                adapter.Fill(dataSet, "table1");
                this.dataGridView1.DataSource = dataSet.Tables["table1"];
            }
    
            private void button2_Click(object sender, EventArgs e)
            {
                mySqlConnection.Close();
            }
        }
    }

[Docker_Mysql8_BADAO_LIUMANG_QIZHI_-CSDN]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/120255887
[BADAO_LIUMANG_QIZHI_CSDN]: https://blog.csdn.net/badao_liumang_qizhi
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