C# 操作 access 数据库的实例代码

编辑: admin 分类: c#语言 发布时间: 2022-03-12 来源:互联网

随笔：

（1）   命名空间

            using System.Data.OleDb;

（2）   连接字符串           

private staticstring connStr = @"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";

            注意：

             a、DataSource = 数据库存放的路径（这里数据库放到了D盘目录下）
             b、 2003版本的Access数据库链接字符串： 

 privatestatic stringconnStr =@"Provider = Microsoft.Jet.OLEDB.4.0;DataSource = d:\login.mdb";
          2007版本的Access数据库链接字符串：privatestaticstring connStr =@"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb【本文出处:国外高防服务器 复制请保留原URL】";

（3）   建立连接：           

OleDbConnection tempconn =new OleDbConnection(connStr);

（4）   使用OleDbCommand类来执行Sql语句：      

 OleDbCommand cmd = new OleDbCommand(sql, tempconn); 
      tempconn.Open();
      cmd.ExecuteNonQuery();

栗子（工具类）：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Windows.Forms;
using System.Data;
namespace test
{
  class AccessHelper
  {
    private static string connStr = @"Provider = Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";
    public static OleDbConnection GetConn()
    {
      OleDbConnection tempconn = new OleDbConnection(connStr);
      MessageBox.Show(tempconn.DataSource);
      tempconn.Open();
      MessageBox.Show(tempconn.State.ToString());
      return (tempconn);
    }
    /// <summary>
    /// 执行增加、删除、修改指令
    /// </summary>
    /// <param name="sql">增加、删除、修改的sql语句</param>
    /// <param name="param">sql语句的参数</param>
    /// <returns></returns>
    public static int ExecuteNonQuery(string sql, params OleDbParameter[] param)
    {
      using (OleDbConnection conn = new OleDbConnection(connStr))
      {
        using (OleDbCommand cmd = new OleDbCommand(sql,conn))
        {
          if (param != null)
          {
            cmd.Parameters.AddRange(param);
          }
          conn.Open();
          return(cmd.ExecuteNonQuery());
        }
      }
    }
    /// <summary>
    /// 执行查询指令，获取返回的首行首列的值
    /// </summary>
    /// <param name="sql">查询sql语句</param>
    /// <param name="param">sql语句的参数</param>
    /// <returns></returns>
    public static object ExecuteScalar(string sql, params OleDbParameter[] param)
    {
      using (OleDbConnection conn = new OleDbConnection(connStr))
      {
        using (OleDbCommand cmd = new OleDbCommand(sql, conn))
        {
          if (param != null)
          {
            cmd.Parameters.AddRange(param);
          }
          conn.Open();
          return (cmd.ExecuteScalar());
        }
      }
    }
    /// <summary>
    /// 执行查询指令，获取返回的datareader
    /// </summary>
    /// <param name="sql">查询sql语句</param>
    /// <param name="param">sql语句的参数</param>
    /// <returns></returns>
    public static OleDbDataReader ExecuteReader(string sql, params OleDbParameter[] param)
    {
      OleDbConnection conn = new OleDbConnection(connStr);
      OleDbCommand cmd = conn.CreateCommand();
      cmd.CommandText = sql;
      cmd.CommandType = CommandType.Text;
      if (param != null)
      {
        cmd.Parameters.AddRange(param);
      }
      conn.Open();
      return (cmd.ExecuteReader(CommandBehavior.CloseConnection));
    }
    /// <summary>
    /// 执行查询指令，获取返回datatable
    /// </summary>
    /// <param name="sql">查询sql语句</param>
    /// <param name="param">sql语句的参数</param>
    /// <returns></returns>
    public static DataTable ExecuteDatable(string sql, params OleDbParameter[] param)
    {
      using (OleDbConnection conn = new OleDbConnection(connStr))
      {
        using (OleDbCommand cmd = new OleDbCommand(sql, conn))
        {
          if (param != null)
          {
            cmd.Parameters.AddRange(param);
          }
          DataTable dt = new DataTable();
          OleDbDataAdapter sda = new OleDbDataAdapter(cmd);
          sda.Fill(dt);
          return (dt);
        }
      }
    }
  }
}

总结

以上所述是小编给大家介绍的C# 操作 access 数据库的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对海外IDC网网站的支持！

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