C#Winfrom数据库增删改查实例--DataAdapter版

标签：c# winfrom 增删改查

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.Data.OleDb;
using System.Configuration;


namespace TestDbOper2
{
    public partial class Form1 : Form
    {
        static string m_connstr = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
        
        OleDbConnection m_conn;
        OleDbCommand m_cmd;
        OleDbDataAdapter m_da;
        DataTable m_dt;

        enum DbState
        {
            dsAdd,//增加状态
            dsMod,//修改状态
            dsDel,//删除状态
            dsBro //浏览状态  
        }
        DbState m_DbState;
       
        public Form1()
        {
            InitializeComponent();

            m_conn = new OleDbConnection(m_connstr);
            m_cmd = new OleDbCommand(" SELECT * FROM Users", m_conn);
            m_da = new OleDbDataAdapter(m_cmd);
            OleDbCommandBuilder cb = new OleDbCommandBuilder(m_da);
            m_dt = new DataTable();
            dataGridView1.DataSource = m_dt;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            dataGridView1.AutoGenerateColumns = false;
            btnQuery_Click(sender, e);
        }

        //查询
        private void btnQuery_Click(object sender, EventArgs e)
        {
            m_DbState = DbState.dsBro;
            SetBtnState();

            m_cmd.CommandText = "select * from users where username like '%"+textBox2.Text+"%'";
            m_dt.Clear();
            m_da.Fill(m_dt);
            m_conn.Close();  
        }

        //增加
        private void btnAdd_Click(object sender, EventArgs e)
        {
            m_DbState = DbState.dsAdd;
            SetBtnState();
            txtUserName.Text = "";
            txtUserAge.Text = "";
            txtUserSex.Text = "";
        }

        //修改
        private void btnMod_Click(object sender, EventArgs e)
        {
            if (dataGridView1.CurrentCell.RowIndex >= m_dt.Rows.Count) { return; }
            m_DbState = DbState.dsMod;
            SetBtnState();

            txtUserName.Text = m_dt.Rows[dataGridView1.CurrentCell.RowIndex]["username"].ToString();
            txtUserAge.Text = m_dt.Rows[dataGridView1.CurrentCell.RowIndex]["userage"].ToString();
            txtUserSex.Text = m_dt.Rows[dataGridView1.CurrentCell.RowIndex]["usersex"].ToString();
        }

        //删除
        private void btnDel_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("确定删除吗？", "提示", MessageBoxButtons.YesNo) == DialogResult.No) { return; }

            try
            {
                m_dt.Rows[dataGridView1.CurrentCell.RowIndex].Delete();
                m_da.Update(m_dt.GetChanges());
                m_dt.AcceptChanges();
                MessageBox.Show("删除成功");
            }
            catch(Exception ex) 
            {
                MessageBox.Show("删除失败"+ex.Message);
            }
        }

        //双击
        private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            btnMod_Click(sender, e);
        }

        //保存
        private void btnSave_Click(object sender, EventArgs e)
        {
            if (m_DbState == DbState.dsMod)
            {
                try
                {
                    DataRow dr= m_dt.Rows[dataGridView1.CurrentCell.RowIndex];
                    dr.BeginEdit();
                    dr["username"] = txtUserName.Text;
                    dr["userage"] = txtUserAge.Text;
                    dr["usersex"] = txtUserSex.Text;
                    dr.EndEdit();
                    m_da.Update(m_dt.GetChanges());
                    m_dt.AcceptChanges();
                    MessageBox.Show("保存成功");
                }
                catch (Exception ex)
                {
                    MessageBox.Show("保存失败 " + ex.Message);
                }
            }
            else
            {
                try
                {
                    DataRow dr = m_dt.NewRow();
                    dr["username"] = txtUserName.Text;
                    dr["userage"] = txtUserAge.Text;
                    dr["usersex"] = txtUserSex.Text;
                    m_dt.Rows.Add(dr);
                    m_da.Update(m_dt.GetChanges());
                    m_dt.AcceptChanges();
                    MessageBox.Show("增加成功");
                }
                catch (Exception ex)
                {
                    MessageBox.Show("增加失败"+ex.Message);
                }
            }
            m_DbState = DbState.dsBro;
            SetBtnState();
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            m_DbState = DbState.dsBro;
            SetBtnState();
        }

        private void SetBtnState()
        {
            btnQuery.Enabled = m_DbState == DbState.dsBro;
            btnAdd.Enabled = m_DbState == DbState.dsBro;
            btnMod.Enabled = m_DbState == DbState.dsBro;
            btnDel.Enabled = m_DbState == DbState.dsBro;
            btnSave.Enabled = m_DbState != DbState.dsBro;
            btnCancel.Enabled = m_DbState != DbState.dsBro;
        }

    }
}

C#Winfrom数据库增删改查实例--DataAdapter版

标签：c# winfrom 增删改查

原文地址：http://blog.csdn.net/lqena/article/details/45969437