C#怎么在窗体程序中操作数据库数据

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一、界面布局

界面中有一个dataGridview、两个Button、两个Label和两个TextBox。

二、定义数据库操作的公共类

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()                                                                          //    连接类型        {            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)                     //    创建连接        {            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)                                                         //    重载  创建连接        {            try            {                m_ClientsqlConn.Close();                m_ClientsqlConn.ConnectionString = connStr;                m_ClientsqlConn.Open();            }            catch (Exception ee)            {                MessageBox.Show(ee.Message);            }        }        public DataTable GetDataTable(string SQLstr)                                     //    获取DataTable 一个表        {            Console.Write("zcn==获取数据库连接,打开数据库");            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==获取数据库连接,打开数据库异常异常");                //MessageBox.Show( ee.Message);                m_logclass.WriteLogFilein(ee.Message, "GetDataTable.txt");                return null;            }            finally            {                m_ClientsqlConn.Close();            }        }        public DataTable GetDataTableUsing(string SQLstr)                                     //    获取DataTable 一个表        {            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)    //根据某一列的名字  获取某个集合中该列的所有值        {            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)   //根据 datatable  获取每一行的数据的datarow        {            List<DataRow> list = new List<DataRow>();            foreach (DataRow dr in dt.Rows)            {                list.Add(dr);              }                     return list;        }         public DataTable GetDataTableOneLine(string SQLstr)                                     //    获取DataTable 一个表中一行        {            MySqlDataAdapter da = new MySqlDataAdapter(SQLstr, m_ClientsqlConn);            DataTable resultDS = new DataTable();            da.Fill(resultDS);            return resultDS;        }        public DataTable GetDataSet_to_Table(string SQLstr)                               //    获取 dataset   多个表中  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)  //根据 ID 删除指定行        {            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)         // 根据        {            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()               //   参数类型  不同数据库连接        {            m_ClientsqlConn.Close();        }    }}

三、在界面中操作数据库方法

ps：数据库的配置信息保存在Config.ini文件中，如果仅是测试用的话，可以直接在

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

处输入ip地址、数据库名、数据库用户名和密码即可

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")]                                        //读写ini文件函数        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();        }        //将所有的textBox值设为空        private void TextBoxNull()        {            textBox1.Text = "";            textBox2.Text = "";        }        //设置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();        }        //双击dataGridView响应事件        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();            }        }        //点击修改按钮响应事件        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("修改失败！");            }        }        private void btnDelete_Click(object sender, EventArgs e)        {             bool flag = false;            int currentIndex = (int)dataGridView1.CurrentRow.Cells[0].Value;            Console.WriteLine("输出当前选中数据行：" + currentIndex);            flag = m_DataBase.deleteRowfor("device_info1", currentIndex);            if (flag)            {                MessageBox.Show("删除成功！");                initDataTable();            }            else            {                MessageBox.Show("删除失败！");            }        }    }}

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