通过本文主要向大家介绍了c#访问access数据库,c#连接access数据库,c#操作access数据库,c#读取access数据库,c#连接access等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
这篇文章整理了C#对Access数据库的查询、添加记录、删除记录和更新数据等一系列的操作示例，有需要的可以参考学习。
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
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
/// <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
/// <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
/// <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
/// <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;
}
}
}
</div>
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";
}
</div>
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;
}
</div>
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();
}
</div>
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 = "";
}
}
</div>
删除记录；
private void button2_Click(object sender, EventArgs