C#如何在窗体程序中操作数据库数据
作者：596785154
这篇文章主要介绍了C#如何在窗体程序中操作数据库数据，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
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 DataRow GetDataRowfor(string tablename,string ID) //根据ID号 返回对应行的 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) // 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！");
}
}
}
}
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。