DataSet之增删改查操作（DataGridView绑定）

Posted 2020-07-03 C# java C++ 开源通信

DataSet数据集，数据缓存在客户端内存中，支持断开式连接.DataGridView控件绑定DataSet时，它自动的改变的DS的行的状态,而且在做增删改查的时候，可以借助SqlCommandBuilder类来完成.
  SqlCommandBuilder必须执行SELECT命令来检索元数据，所以它要求多往返服务器一次，从而增加了应用程序的开销，而且操作的表必须要有主键约束。优点是自动建立insertcommand等命令
1,添加操作
  private void button2_Click(object sender, EventArgs e)
        {
            using (SqlConnection con = new SqlConnection(connstring))
            {
                con.Open();
                dapt = new SqlDataAdapter("select stucode,spcode,ctcode,stunits from stunits", con);
                SqlCommandBuilder sdb = new SqlCommandBuilder(dapt);
                DataSet ds1 = ds.GetChanges();
                if (ds.HasChanges())
                {
                    try
                    {
                        dapt.Update(ds, "stunit");
                        MessageBox.Show("保存成功", "提示");
                    }
                    catch (SqlException ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
               
            }
            this.dataGridView1.AllowUserToAddRows =false;
        }
2)删除操作(选中整行)
   private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            using (SqlConnection con = new SqlConnection(connstring))
            {
                //con.Open();
                StringBuilder sb  =new StringBuilder();
                sb.Append("delete stunits where stucode=‘"+this.dataGridView1.SelectedCells[0].Value.ToString()+"‘");
                SqlCommand cmd = new SqlCommand(sb.ToString(), con);
                dapt.DeleteCommand = cmd;
                int rowindex = this.dataGridView1.CurrentCell.RowIndex;
                ds.Tables["stunit"].Rows[rowindex].Delete();//修改行的状态
               // string celltext = this.dataGridView1.SelectedCells[rowindex].Value.ToString();
               // MessageBox.Show(celltext);
                if(ds.HasChanges(DataRowState.Deleted))
                {
                     try
                    {
                        dapt.Update(ds, "stunit");
                        MessageBox.Show("删除成功", "提示");
                    }
                    catch (SqlException ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
            }
        }
2)删除操作(单击第一个单无格删除)
    private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == 0 && e.RowIndex >= 0)
            {
                using (conn = new SqlConnection(con))
                {
                    conn.Open();
                    StringBuilder sb = new StringBuilder();
                    sb.Append("delete zy_bbxmxx where 代码=‘" + this.dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString()+"‘");
                    //MessageBox.Show(sb.ToString());
                    dapt.DeleteCommand = new SqlCommand(sb.ToString(), conn);
                    DialogResult answer = MessageBox.Show("是否删除", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation);
                    if (answer == DialogResult.Yes)
                    {
                        try
                        {
                            ds.Tables[0].Rows[e.RowIndex].Delete();//改变行的状态
                            dapt.Update(ds, "zy_bbxx");
                            MessageBox.Show("删除成功");
                        }
                        catch (SqlException ex)
                        {
                            
                            MessageBox.Show(ex.Message);
                        }
                       
                    }
                }
            }
        } 
        
3)修改操作
 private void 修改ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            using (SqlConnection con = new SqlConnection(connstring))
            {
                con.Open();
                //DataSet ds1 = ds.GetChanges();
                dapt = new SqlDataAdapter("select stucode,spcode,ctcode,stunits from stunits", con);
                SqlCommandBuilder sdb = new SqlCommandBuilder(dapt);
                if (ds.HasChanges())
                {
                    try
                    {
                        dapt.Update(ds, "stunit");
                        MessageBox.Show("修改成功","提示");
                    }
                    catch (SqlException ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
            }
[转载]DataSet之增删改查操作（DataGridView绑定）
或者
 private void btnEdit_Click(object sender, EventArgs e)
        {
            using (SqlConnection conn=new SqlConnection(con))
            {
                DataSet ds1 = ds.GetChanges();//得到修改后的DataSet
                if (ds1 != null)
                {
                    try
                    {
                        dapt = new SqlDataAdapter("select * from zy_bbxmxx", conn);
                        SqlCommandBuilder sb = new SqlCommandBuilder(dapt);        
                        dapt.Update(ds,"zy_bbxx");
                        MessageBox.Show("修改成功");
                     
                    }
                    catch (ArgumentNullException ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                
                }
            }  
        }
4）查询操作
  private void textBox5_TextChanged(object sender, EventArgs e)
        {
            this.dataGridView2.DataSource = ds.Tables[1];
                DataView dv = ds.Tables[1].DefaultView;
                dv.RowFilter = "stucode like   ‘" + ‘%‘ + this.textBox5.Text + ‘%‘ + "‘";
                this.dataGridView2.DataSource = ds.Tables[1];
      }