在窗体程序中操作数据库数据 C#怎样在窗体程序中操作数据库数据
596785154 人气:0想了解C#怎样在窗体程序中操作数据库数据的相关内容吗，596785154在本文为您仔细讲解在窗体程序中操作数据库数据的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：C#操作数据库,C#窗体程序,C#操作数据库数据，下面大家一起来学习吧。
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。
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