C#访问Access完整增删改查代码
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以下代码都经过实践测试可用；
首先是AccessHelper.cs，网上有下载，下面附送一份；
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Data.OleDb;using System.Data;using System.Windows.Forms;namespace yxdain{ public class AccessHelper { private string conn_str = null; private OleDbConnection ole_connection = null; private OleDbCommand ole_command = null; private OleDbDataReader ole_reader = null; private DataTable dt = null; /// <summary> /// 构造函数 /// </summary> public AccessHelper() { //conn_str = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + Environment.CurrentDirectory + "\\yxdain.accdb'"; conn_str = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + Environment.CurrentDirectory + "\\yxdain.accdb'"; InitDB(); } private void InitDB() { ole_connection =new OleDbConnection(conn_str);//创建实例 ole_command =new OleDbCommand(); } /// <summary> /// 构造函数 /// </summary> /// <param name="db_path">数据库路径</param> public AccessHelper(string db_path) { //conn_str ="Provider=Microsoft.Jet.OLEDB.4.0;Data Source='"+ db_path + "'"; conn_str = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + db_path + "'"; InitDB(); } /// <summary> /// 转换数据格式 /// </summary> /// <param name="reader">数据源</param> /// <returns>数据列表</returns> private DataTable ConvertOleDbReaderToDataTable(ref OleDbDataReader reader) { DataTable dt_tmp =null; DataRow dr =null; int data_column_count = 0; int i = 0; data_column_count = reader.FieldCount; dt_tmp = BuildAndInitDataTable(data_column_count); if(dt_tmp == null) { return null; } while(reader.Read()) { dr = dt_tmp.NewRow(); for(i = 0; i < data_column_count; ++i) { dr[i] = reader[i]; } dt_tmp.Rows.Add(dr); } return dt_tmp; } /// <summary> /// 创建并初始化数据列表 /// </summary> /// <param name="Field_Count">列的个数</param> /// <returns>数据列表</returns> private DataTable BuildAndInitDataTable(int Field_Count) { DataTable dt_tmp =null; DataColumn dc =null; int i = 0; if(Field_Count <= 0) { return null; } dt_tmp =new DataTable(); for(i = 0; i < Field_Count; ++i) { dc =new DataColumn(i.ToString()); dt_tmp.Columns.Add(dc); } return dt_tmp; } /// <summary> /// 从数据库里面获取数据 /// </summary> /// <param name="strSql">查询语句</param> /// <returns>数据列表</returns> public DataTable GetDataTableFromDB(string strSql) { if(conn_str == null) { return null; } try { ole_connection.Open();//打开连接 if(ole_connection.State == ConnectionState.Closed) { return null; } ole_command.CommandText = strSql; ole_command.Connection = ole_connection; ole_reader = ole_command.ExecuteReader(CommandBehavior.Default); dt = ConvertOleDbReaderToDataTable(ref ole_reader); ole_reader.Close(); ole_reader.Dispose(); } catch(System.Exception e) { //Console.WriteLine(e.ToString()); MessageBox.Show(e.Message); } finally { if(ole_connection.State != ConnectionState.Closed) { ole_connection.Close(); } } return dt; } /// <summary> /// 执行sql语句 /// </summary> /// <param name="strSql">sql语句</param> /// <returns>返回结果</returns> public int ExcuteSql(string strSql) { int nResult = 0; try { ole_connection.Open();//打开数据库连接 if(ole_connection.State == ConnectionState.Closed) { return nResult; } ole_command.Connection = ole_connection; ole_command.CommandText = strSql; nResult = ole_command.ExecuteNonQuery(); } catch(System.Exception e) { //Console.WriteLine(e.ToString()); MessageBox.Show(e.Message); return nResult; } finally { if(ole_connection.State != ConnectionState.Closed) { ole_connection.Close(); } } return nResult; } }}定义变量，设置列标题；
private AccessHelper achelp;...... private void Form1_Load(object sender, EventArgs e) { achelp = new AccessHelper(); string sql1 = "select * from ycyx"; databind1(sql1); dataGridView1.Columns[0].Visible = false; dataGridView1.Columns[1].HeaderCell.Value = "服务号码"; dataGridView1.Columns[2].HeaderCell.Value = "客户名称"; dataGridView1.Columns[3].HeaderCell.Value = "归属地区"; dataGridView1.Columns[4].HeaderCell.Value = "当前品牌"; dataGridView1.Columns[5].HeaderCell.Value = "当前套餐"; dataGridView1.Columns[6].HeaderCell.Value = "当前状态"; }显示数据表全部内容；
private void databind1(string sqlstr) { DataTable dt = new DataTable(); dt = achelp.GetDataTableFromDB(sqlstr); dataGridView1.DataSource = dt; }读取要更新记录到更新窗体控件；
private void button3_Click(object sender, EventArgs e) { if (dataGridView1.SelectedRows.Count < 1 || dataGridView1.SelectedRows[0].Cells[1].Value == null) { MessageBox.Show("没有选中行。", "M营销"); return; } //f3.Owner = this; DataTable dt = new DataTable(); object oid = dataGridView1.SelectedRows[0].Cells[0].Value; string sql = "select * from ycyx where ID=" + oid; dt = achelp.GetDataTableFromDB(sql); f3 = new Form3(); f3.id = int.Parse(oid.ToString()); //f3.id = 2; f3.Text1 = dt.Rows[0][1].ToString(); f3.Text2 = dt.Rows[0][2].ToString(); f3.Text3 = dt.Rows[0][3].ToString(); f3.Text4 = dt.Rows[0][4].ToString(); f3.Text5 = dt.Rows[0][5].ToString(); f3.Text6 = dt.Rows[0][6].ToString(); f3.ShowDialog(); }添加记录；
private void button4_Click(object sender, EventArgs e) { if (textBox1.Text == "" && textBox2.Text == "" && textBox3.Text == "" && textBox4.Text == "" && textBox5.Text == "" && textBox6.Text == "") { MessageBox.Show("没有要添加的内容", "M营销添加"); return; } else { string sql = "insert into ycyx (fwhm,khmc,gsdq,dqpp,dqtc,dqzt) values ('" + textBox1.Text + "','" + textBox2.Text + "','"+ textBox3.Text + "','"+ textBox4.Text + "','"+ textBox5.Text + "','"+ textBox6.Text + "')"; int ret = achelp.ExcuteSql(sql); string sql1 = "select * from ycyx"; databind1(sql1); textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; textBox4.Text = ""; textBox5.Text = ""; textBox6.Text = ""; } }删除记录；
private void button2_Click(object sender, EventArgs e) { if (dataGridView1.SelectedRows.Count < 1 || dataGridView1.SelectedRows[0].Cells[1].Value == null) { MessageBox.Show("没有选中行。", "M营销"); } else { object oid = dataGridView1.SelectedRows[0].Cells[0].Value; if (DialogResult.No == MessageBox.Show("将删除第 " + (dataGridView1.CurrentCell.RowIndex + 1).ToString() + " 行，确定？", "M营销", MessageBoxButtons.YesNo)) { return; } else { string sql = "delete from ycyx where ID=" + oid; int ret = achelp.ExcuteSql(sql); } string sql1 = "select * from ycyx"; databind1(sql1); } }查询；
private void button13_Click(object sender, EventArgs e) { if (textBox23.Text == "") { MessageBox.Show("请输入要查询的当前品牌", "M营销"); return; } else { string sql = "select * from ycyx where dqpp='" + textBox23.Text + "'"; DataTable dt = new System.Data.DataTable(); dt = achelp.GetDataTableFromDB(sql); dataGridView1.DataSource = dt; } }用户确定显示或不显示哪些数据列；
private void button15_Click(object sender, EventArgs e) { if (checkBox1.Checked == true) { dataGridView1.Columns[1].Visible = true; } else { dataGridView1.Columns[1].Visible = false; } if (checkBox2.Checked == true) { dataGridView1.Columns[2].Visible = true; } else { dataGridView1.Columns[2].Visible = false; } if (checkBox3.Checked == true) { dataGridView1.Columns[3].Visible = true; } else { dataGridView1.Columns[3].Visible = false; } if (checkBox4.Checked == true) { dataGridView1.Columns[4].Visible = true; } else { dataGridView1.Columns[4].Visible = false; } if (checkBox5.Checked == true) { dataGridView1.Columns[5].Visible = true; } else { dataGridView1.Columns[5].Visible = false; } if (checkBox6.Checked == true) { dataGridView1.Columns[6].Visible = true; } else { dataGridView1.Columns[6].Visible = false; } }更新数据；
public partial class Form3 : Form { private AccessHelper achelp; private int iid; public Form3() { InitializeComponent(); achelp = new AccessHelper(); iid = 0; } // 更新 private void button1_Click(object sender, EventArgs e) { try { //UPDATE Person SET Address = 'Zhongshan 23', City = 'Nanjing'WHERE LastName = 'Wilson' string sql = "update ycyx set fwhm='"+textBox1.Text+"',khmc='"+textBox2.Text+"',gsdq='"+textBox3.Text+"',dqpp='"+textBox4.Text+ "',dqtc='"+textBox5.Text+"',dqzt='"+textBox6.Text+"' where ID="+iid; int ret = achelp.ExcuteSql(sql); if (ret > -1) { this.Hide(); MessageBox.Show("更新成功", "M营销"); } } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void Form3_Load(object sender, EventArgs e) { } public int id { get { return this.iid; } set { this.iid = value; } } public string Text1 { get { return this.textBox1.Text; } set { this.textBox1.Text = value; } } public string Text2 { get { return this.textBox2.Text; } set { this.textBox2.Text = value; } } public string Text3 { get { return this.textBox3.Text; } set { this.textBox3.Text = value; } } public string Text4 { get { return this.textBox4.Text; } set { this.textBox4.Text = value; } } public string Text5 { get { return this.textBox5.Text; } set { this.textBox5.Text = value; } } public string Text6 { get { return this.textBox6.Text; } set { this.textBox6.Text = value; } } //取消 private void button2_Click(object sender, EventArgs e) { this.Hide(); } }}注意此处有一个技巧；C# Winform，在窗体之间传值，或在一个窗体中设置另一个窗体的控件的值时，有多种方式；最好方式是如上代码所示；使用.net的get、set属性；
控件是一个窗体的私有变量，不能在另一个窗体中直接访问；为了在a窗体中设置b窗体的控件的值，对b窗体的控件都添加一个带get、set的公共属性，就可在a中设置b中控件的值，具体看代码；
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