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C#如何在窗體程序中操作數(shù)據(jù)庫數(shù)據(jù)_C#教程

作者：596785154 ? 更新時(shí)間： 2022-06-18 編程語言

一、界面布局

界面中有一個(gè)dataGridview、兩個(gè)Button、兩個(gè)Label和兩個(gè)TextBox。

二、定義數(shù)據(jù)庫操作的公共類

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Windows.Forms;
using System.Data;
using MySql.Data.MySqlClient;
namespace TemSys
{
   public  class DBCtrl
   {
        private MySqlConnection m_ClientsqlConn;
        public DBCtrl()                                                                          //    連接類型
        {
            m_ClientsqlConn = new MySqlConnection();
            try
            {
                m_ClientsqlConn.Dispose();
                m_ClientsqlConn.Close();              
                m_ClientsqlConn.ConnectionString = "Database=dbName;Data Source=localhost;User Id=root;Password=123;charset=utf8";
                m_ClientsqlConn.Open();
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.Message);
            }
        }
        public DBCtrl(string IP, string DBname, string Uname, string Pword)                     //    創(chuàng)建連接
        {
            m_ClientsqlConn = new MySqlConnection();
            try
            {
                m_ClientsqlConn.Dispose();
                m_ClientsqlConn.Close();
                m_ClientsqlConn.ConnectionString = string.Format("Database={0};Data Source={1};User Id={2};Password={3};charset=utf8", DBname, IP, Uname, Pword);
                m_ClientsqlConn.Open();
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.Message);
            }
        }
        public void DBConn(string connStr)                                                         //    重載  創(chuàng)建連接
        {
            try
            {
                m_ClientsqlConn.Close();
                m_ClientsqlConn.ConnectionString = connStr;
                m_ClientsqlConn.Open();
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.Message);
            }
        }
        public DataTable GetDataTable(string SQLstr)                                     //    獲取DataTable 一個(gè)表
        {
            Console.Write("zcn==獲取數(shù)據(jù)庫連接,打開數(shù)據(jù)庫");
            try
            {
                if (m_ClientsqlConn.State == ConnectionState.Open)
                    m_ClientsqlConn.Close();
                m_ClientsqlConn.Open();
                MySqlDataAdapter da = new MySqlDataAdapter(SQLstr, m_ClientsqlConn);
                DataTable resultDS = new DataTable();
                da.Fill(resultDS);
                return resultDS;
            }
            catch (Exception ee)
            {
                Console.Write("zcn==獲取數(shù)據(jù)庫連接,打開數(shù)據(jù)庫異常異常");
                //MessageBox.Show( ee.Message);
                m_logclass.WriteLogFilein(ee.Message, "GetDataTable.txt");
                return null;
            }
            finally
            {
                m_ClientsqlConn.Close();
            }
        }
        public DataTable GetDataTableUsing(string SQLstr)                                     //    獲取DataTable 一個(gè)表
        {
            using (MySqlConnection m_ClientsqlConn = new MySqlConnection())
            {
            }
            try
            {
                if (m_ClientsqlConn.State == ConnectionState.Open)
                    m_ClientsqlConn.Close();
                m_ClientsqlConn.Open();
                MySqlDataAdapter da = new MySqlDataAdapter(SQLstr, m_ClientsqlConn);
                DataTable resultDS = new DataTable();
                da.Fill(resultDS);
                return resultDS;
            }
            catch (Exception ee)
            {
                //MessageBox.Show( ee.Message);
                return null;
            }
        }
        public List<string> GetStringListfor(string lineName,DataTable dt)    //根據(jù)某一列的名字  獲取某個(gè)集合中該列的所有值
        {
            List<string> list = new List<string>();
            foreach (DataRow dr in dt.Rows)
            {
                list.Add((string)dr[lineName]);
            }
            return list;
        }
        public List<DataRow> GetDataRowfor(DataTable dt)   //根據(jù) datatable  獲取每一行的數(shù)據(jù)的datarow
        {
            List<DataRow> list = new List<DataRow>();
            foreach (DataRow dr in dt.Rows)
            {
                list.Add(dr);  
            }         
            return list;
        }
/*
        public DataRow GetDataRowfor(string tablename,string ID)  //根據(jù)ID號(hào) 返回對(duì)應(yīng)行的  DataRow
        {
            string ss = "select * from " + tablename + " where ID = \'"+ID +"\'";
            DataRow dr = new DataRow();
            DataTable dt = GetDataTable(ss);
            dr = dt.Rows[0];
            return dr; 
        }
*/
         public DataTable GetDataTableOneLine(string SQLstr)                                     //    獲取DataTable 一個(gè)表中一行
        {
            MySqlDataAdapter da = new MySqlDataAdapter(SQLstr, m_ClientsqlConn);
            DataTable resultDS = new DataTable();
            da.Fill(resultDS);
            return resultDS;
        }
        public DataTable GetDataSet_to_Table(string SQLstr)                               //    獲取 dataset   多個(gè)表中  table
        {
            try
            {
                MySqlDataAdapter da = new MySqlDataAdapter(SQLstr, m_ClientsqlConn);
                DataSet ds = new DataSet();
                da.Fill(ds);
                return ds.Tables[0];
            }
            catch
            {
                return null;
            }
        }
        public Boolean InsertDBase(string insString)
        {
            try
            {
                if (m_ClientsqlConn.State == ConnectionState.Open)
                    m_ClientsqlConn.Close();
                m_ClientsqlConn.Open();
                MySqlCommand sqlcomd = new MySqlCommand(insString, m_ClientsqlConn);
                sqlcomd.ExecuteNonQuery();
                return true;
            }
            catch (Exception ee)
            {
                return false;
            }
            finally
            {
                m_ClientsqlConn.Close();
            }
        }
        public Boolean deleteRowfor(string tablename,int deleteID)  //根據(jù) ID 刪除指定行
        {
            try
            {
                string ss ="delete from "+ tablename +" where ID = "+ deleteID;
                if (m_ClientsqlConn.State == ConnectionState.Open)
                    m_ClientsqlConn.Close();
                m_ClientsqlConn.Open();
                MySqlCommand sqlcmd = new MySqlCommand(ss, m_ClientsqlConn);
                sqlcmd.ExecuteNonQuery();
                return true;
            }
            catch(Exception ee)
            {
                return false;
            } 
        }
        public Boolean ModifyRowfor(string modifystr,string modifyID)         // 根據(jù)
        {
            try
            {
                string ss = modifystr + " where id = " + modifyID;
                if (m_ClientsqlConn.State == ConnectionState.Open)
                    m_ClientsqlConn.Close();
                m_ClientsqlConn.Open();
                MySqlCommand sqlcmd = new MySqlCommand(ss, m_ClientsqlConn);
                sqlcmd.ExecuteNonQuery();
                return true;
            }
            catch (Exception ee)
            {
                return false;
            }
            finally
            {
                m_ClientsqlConn.Close();
            }
        }
        public void CloseDBase()               //   參數(shù)類型  不同數(shù)據(jù)庫連接
        {
            m_ClientsqlConn.Close();
        }
    }
}

三、在界面中操作數(shù)據(jù)庫方法

ps：數(shù)據(jù)庫的配置信息保存在Config.ini文件中，如果僅是測(cè)試用的話，可以直接在

m_DataBase = new DBCtrl(ipstr, namestr, usernamestr, passwordstr);

處輸入ip地址、數(shù)據(jù)庫名、數(shù)據(jù)庫用戶名和密碼即可

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 System.Runtime.InteropServices;
namespace TemSys
{
    public partial class ModifyDevice : Form
    {
        [DllImport("kernel32")]                                        //讀寫ini文件函數(shù)
        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
        [DllImport("kernel32")]
        private static extern long GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);
        DataTable dt = new DataTable();
        private DBCtrl m_DataBase;
        public ModifyDevice()
        {
            InitializeComponent();
        }
        //將所有的textBox值設(shè)為空
        private void TextBoxNull()
        {
            textBox1.Text = "";
            textBox2.Text = "";
        }
        //設(shè)置Lab值
        private void labelshow()
        {
            label1.Text = dataGridView1.Columns[0].HeaderText;
            label2.Text = dataGridView1.Columns[12].HeaderText;
        }          
        //初始化界面
        private void ModifyDevice_Load(object sender, EventArgs e)
        {
            StringBuilder retval = new StringBuilder();
            GetPrivateProfileString("DBConfig", "dbip", "", retval, 20, AppDomain.CurrentDomain.BaseDirectory + "Config.ini");
            string ipstr = retval.ToString();
            GetPrivateProfileString("DBConfig", "dbname", "", retval, 20, AppDomain.CurrentDomain.BaseDirectory + "Config.ini");
            string namestr = retval.ToString();
            GetPrivateProfileString("DBConfig", "dbusername", "", retval, 20, AppDomain.CurrentDomain.BaseDirectory + "Config.ini");
            string usernamestr = retval.ToString();
            GetPrivateProfileString("DBConfig", "dbpassword", "", retval, 20, AppDomain.CurrentDomain.BaseDirectory + "Config.ini");
            string passwordstr = retval.ToString();
            m_DataBase = new DBCtrl(ipstr, namestr, usernamestr, passwordstr);
            initDataTable();
        }
        private void initDataTable()
        {
            string ssp = string.Format("select * from device_info1");
            dt = m_DataBase.GetDataTable(ssp);
            dataGridView1.DataSource = dt;
            labelshow();
        }
        //雙擊dataGridView響應(yīng)事件
        private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            string index = dataGridView1.CurrentRow.Cells[0].Value.ToString();
            if (label1.Text == "id")
            {
                string ssp = string.Format("select * from device_info1 where id='" + index + "'");
                dt = m_DataBase.GetDataTable(ssp); 
                //DataRow row = dt.Rows[0];
                textBox1.Text = dt.Rows[0]["id"].ToString();
                textBox2.Text = dt.Rows[0]["number"].ToString();
            }
        }
        //點(diǎn)擊修改按鈕響應(yīng)事件
        private void btnModify_Click(object sender, EventArgs e)
        {
            bool flag = false;
            string ssp = string.Format("update device_info1 set number='" + textBox2.Text + "'");
            flag = m_DataBase.ModifyRowfor(ssp, textBox1.Text);
            if (flag)
            {
                MessageBox.Show("修改成功！");
                initDataTable();
            }
            else
            {
                MessageBox.Show("修改失敗！");
            }
        }
        private void btnDelete_Click(object sender, EventArgs e)
        {
             bool flag = false;
            int currentIndex = (int)dataGridView1.CurrentRow.Cells[0].Value;
            Console.WriteLine("輸出當(dāng)前選中數(shù)據(jù)行：" + currentIndex);
            flag = m_DataBase.deleteRowfor("device_info1", currentIndex);
            if (flag)
            {
                MessageBox.Show("刪除成功！");
                initDataTable();
            }
            else
            {
                MessageBox.Show("刪除失敗！");
            }
        }
    }
}

原文鏈接：https://blog.csdn.net/zcn596785154/article/details/81283722

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