C#在winform中实现数据增删改查等功能

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Data;using System.Configuration;using System.Data.SqlClient;using System.Security.Cryptography;namespace Data{ class SqlDesigner {  private static string connStr = ConfigurationManager.ConnectionStrings["data"].ConnectionString;  /// <summary>  /// 返回受影响的数据行数  /// </summary>  /// <param name="sql"></param>  /// <returns></returns>  public static int ExecuteNoQuery(string sql)  {   using (SqlConnection conn=new SqlConnection(connStr))   {    conn.Open();    using (SqlCommand cmd=conn.CreateCommand())    {     cmd.CommandText = sql;     return cmd.ExecuteNonQuery();         }   }  }  /// <summary>  /// 返回一个数据集  /// </summary>  /// <param name="sql"></param>  /// <returns></returns>  public static DataSet ExecuteDataSet(string sql)  {   using (SqlConnection xonn=new SqlConnection(connStr))   {    xonn.Open();    using (SqlCommand cmd = xonn.CreateCommand())    {     cmd.CommandText = sql;     SqlDataAdapter adapter = new SqlDataAdapter(cmd);     DataSet dataset = new DataSet();     adapter.Fill(dataset);     return dataset;    }   }  }  public static object ExecuteScalar(string sql)  {   using (SqlConnection conn=new SqlConnection(connStr))   {    conn.Open();    using (SqlCommand cmd=conn.CreateCommand())    {     cmd.CommandText = sql;     return cmd.ExecuteScalar();    }   }  }  /// <summary>  /// md5加密  /// </summary>  /// <param name="strPwd"></param>  /// <returns></returns>  public static string GetMD5(string strPwd)  {   string pwd = "";   //实例化一个md5对象   MD5 md5 = MD5.Create();   // 加密后是一个字节类型的数组   byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(strPwd));   //翻转生成的MD5码     s.Reverse();   //通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得   //只取MD5码的一部分，这样恶意访问者无法知道取的是哪几位   for (int i = 3; i < s.Length - 1; i++)   {    //将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符    //进一步对生成的MD5码做一些改造    pwd = pwd + (s[i] < 198 ? s[i] + 28 : s[i]).ToString("X");   }   return pwd;  }  }}

ds = SqlDesigner.ExecuteDataSet("select * from dtuser");   dt = ds.Tables[0];   dataGridView1.DataSource = dt;

 i = SqlDesigner.ExecuteNoQuery("insert into dtuser(uid,uname,pwd,uflag)values('" + textBox1.Text + "','" + textBox2.Text + "','" +textBox3.Text+ "','" + textBox4.Text + "')");

string currentIndex = dataGridView1.CurrentRow.Cells[0].Value.ToString();i = SqlDesigner.ExecuteNoQuery("delete from dtuser where uid='" + currentIndex + "'");

i = SqlDesigner.ExecuteNoQuery("update dtrole set rname='" + textBox2.Text + "',flag='" + textBox3.Text + "'where rid='" + textBox1.Text + "'");

string str = SqlDesigner.GetMD5(textBox3.Text.Trim());     i = SqlDesigner.ExecuteNoQuery("insert into dtuser(uid,uname,pwd,uflag)values('" + textBox1.Text + "','" + textBox2.Text + "','" + str + "','" + textBox4.Text + "')");

//绑定数据源dataGridView1.DataSource = dt;//自动适应列宽dataGridView1.Columns[1].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace Data{ public partial class Form1 : Form {    public Form1()  {   InitializeComponent();     }           DataSet ds = new DataSet();  DataTable dt = new DataTable();  private void TextBoxNull()  {   textBox1.Text = "";   textBox2.Text = "";   textBox3.Text = "";   textBox4.Text = "";  }  private void 用户ToolStripMenuItem_Click(object sender, EventArgs e)  {   TextBoxNull();   ds = SqlDesigner.ExecuteDataSet("select * from dtuser");      dt = ds.Tables[0];   dataGridView1.DataSource = dt;   labelshow();  }  private void 角色ToolStripMenuItem_Click(object sender, EventArgs e)  {   TextBoxNull();   ds = SqlDesigner.ExecuteDataSet("select *from dtrole");   dt = ds.Tables[0];   dataGridView1.DataSource = dt;   label4.Text = "None";   textBox4.Text = "None";   labelshow();  }  private void 对象ToolStripMenuItem_Click(object sender, EventArgs e)  {   TextBoxNull();   ds = SqlDesigner.ExecuteDataSet("select * from dtfunction");   dt = ds.Tables[0];   dataGridView1.DataSource = dt;   labelshow();  }  private void 帮助ToolStripMenuItem_Click(object sender, EventArgs e)  {   TextBoxNull();   ds = SqlDesigner.ExecuteDataSet("select * from help");   dt = ds.Tables[0];   dataGridView1.DataSource = dt;   dataGridView1.Columns[1].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;  }  //双击dataGridView1  private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)  {   string index = dataGridView1.CurrentRow.Cells[0].Value.ToString();   if (label1.Text == "uid")   {    ds = SqlDesigner.ExecuteDataSet("select *from dtuser where uid='" + index + "'");    dt = ds.Tables[0];    DataRow row = dt.Rows[0];    textBox1.Text = row["uid"].ToString();    textBox2.Text = row["uname"].ToString();    textBox3.Text = row["pwd"].ToString();    textBox4.Text = row["uflag"].ToString();   }   if (label1.Text == "rid")   {    ds = SqlDesigner.ExecuteDataSet("select *from dtrole where rid='" + index + "'");    dt = ds.Tables[0];    DataRow row = dt.Rows[0];    textBox1.Text = row["rid"].ToString();    textBox2.Text = row["rname"].ToString();    textBox3.Text = row["flag"].ToString();    textBox4.Text = "None";   }   if (label1.Text == "fid")   {    ds = SqlDesigner.ExecuteDataSet("select *from dtfunction where fid='" + index + "'");    dt = ds.Tables[0];    DataRow row = dt.Rows[0];    textBox1.Text = row["fid"].ToString();    textBox2.Text = row["fname"].ToString();    textBox3.Text = row["flag"].ToString();    textBox4.Text = row["uflag"].ToString();   }  }  private void labelshow()   {   label1.Text = dataGridView1.Columns[0].HeaderText;   label2.Text = dataGridView1.Columns[1].HeaderText;   label3.Text = dataGridView1.Columns[2].HeaderText;   try   {    label4.Text = dataGridView1.Columns[3].HeaderText;   }   catch (Exception)   {    label4.Text = "None";   }                 }      private void btn_add_Click(object sender, EventArgs e)  {      int i = 0;   if (label1.Text=="uid")   {    string str = SqlDesigner.GetMD5(textBox3.Text.Trim());        i = SqlDesigner.ExecuteNoQuery("insert into dtuser(uid,uname,pwd,uflag)values('" + textBox1.Text + "','" + textBox2.Text + "','" + str + "','" + textBox4.Text + "')");   }   else if (label1.Text == "rid")   {        i = SqlDesigner.ExecuteNoQuery("insert into dtrole(rid,rname,flag)values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "')");   }   else   {    try    {     i = SqlDesigner.ExecuteNoQuery("insert into dtfunction(fid,rid,uid,uflag)values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "')");    }    catch (Exception)    {     MessageBox.Show("添加失败");    }       }      if (i > 0)   {    MessageBox.Show("添加成功");   }   else   {    MessageBox.Show("添加失败");   }            }    private void btn_del_Click(object sender, EventArgs e)  {   int i = 0;   string currentIndex = dataGridView1.CurrentRow.Cells[0].Value.ToString();   if (label1.Text=="uid")   {    i = SqlDesigner.ExecuteNoQuery("delete from dtuser where uid='" + currentIndex + "'");   }   else if (label1.Text=="fid")   {    i = SqlDesigner.ExecuteNoQuery("delete from dtfunction where fid='" + currentIndex + "'");   }   else   {    i = SqlDesigner.ExecuteNoQuery("delete from dtrole where rid='" + currentIndex + "'");   }   if (i > 0)   {    MessageBox.Show("删除成功");   }   else   {    MessageBox.Show("删除失败");   }  }  private void btn_update_Click(object sender, EventArgs e)  {   int i = 0;   if (label1.Text == "rid")   {    i = SqlDesigner.ExecuteNoQuery("update dtrole set rname='" + textBox2.Text + "',flag='" + textBox3.Text + "'where rid='" + textBox1.Text + "'");   }   if (label1.Text == "uid")   {    i = SqlDesigner.ExecuteNoQuery("update dtuser set uname='" + textBox2.Text + "',pwd='" + textBox3.Text + "',uflag='" + textBox4.Text + "'where uid='" + textBox1.Text + "'");   }   if (label1.Text=="fid")   {    i = SqlDesigner.ExecuteNoQuery("update dtfunction set rid='" + textBox2.Text + "',uid='" + textBox3.Text + "',uflag='" + textBox4.Text + "'where fid='" + textBox1.Text + "'");   }   if (i > 0)   {    MessageBox.Show("Succeed！");   }   else   {    MessageBox.Show("Failed！");   }  }    }}