Microsoft Access数据库操作类(C#)

博文介绍的Microsoft Access数据库操作类是C#语言的，可实现对Microsoft Access数据库的增删改查询等操作。并且该操作类可实现对图片的存储，博文的最后附上如何将Image图片转换为byte[]数组类型，以及如何将byte[]数组类型转换为Image图片。

       博文中会贴出该类的下载地址，可以直接下载使用。

        注：操作Microsoft Access数据库需要安装Microsoft Office Access DataBase Engine，可以直接去微软的官网下载。

1. AccessOperate类

using System.Data;
using System.Data.OleDb;

//C#的Microsoft Access操作类
public class AccessOperate
{
    private string OleDbConnectionString;    //数据库连接

    /// <summary>
    /// 构造函数
    /// 初始化连接数据库参数
    /// </summary>
    public AccessOperate()
    {
        //Microsoft Access2003的连接语句
    //OleDbConnectionString = "Provider = Microsoft.ACE.OLEDB.4.0;Data Source=.\\Data\\DataBaseName.mdb;Jet OLEDB:Database Password=123456";
    //Microsoft Access2007及以上的连接语句
    OleDbConnectionString = "Provider = Microsoft.ACE.OLEDB.12.0;Data Source=.\\Data\\DataBaseName.accdb;Jet OLEDB:Database Password=123456";
    }

    /// <summary>
    /// 构造函数
    /// 初始化连接数据库参数
    /// </summary>
    /// <param name="ConSqlServer">连接对象</param>
    public AccessOperate(string ConSqlServer)
    {
        OleDbConnectionString = ConSqlServer;
    }

    /// <summary>
    /// 打开数据库连接
    /// </summary>
    /// <param name="cnn">连接</param>
    public void Open(OleDbConnection cnn)
    {
        if (cnn.State == ConnectionState.Closed)
        {
            cnn.Open();
        }
    }

    /// <summary>
    /// 关闭数据库连接
    /// </summary>
    /// <param name="cnn">连接</param>
    public void Close(OleDbConnection cnn)
    {
        if (cnn != null)
        {
            if (cnn.State == ConnectionState.Open)
            {
                cnn.Close();
            }
            cnn.Dispose();
        }
    }

    /// <summary>
    /// 查询
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <returns>是否存在</returns>
    public bool ChaXun(string strSql)
    {
        OleDbConnection cnn = new OleDbConnection(OleDbConnectionString);
        OleDbCommand cmd = new OleDbCommand();
        try
        {
            Open(cnn);
            cmd = new OleDbCommand(strSql, cnn);
            return cmd.ExecuteReader().Read();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
        finally
        {
            cmd.Dispose();
            Close(cnn);
        }
    }

    /// <summary>
    /// 查询
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <returns>第一行第一列结果</returns>
    public string ChaXun2(string strSql)
    {
        OleDbConnection cnn = new OleDbConnection(OleDbConnectionString);
        OleDbCommand cmd = new OleDbCommand();
        try
        {
            Open(cnn);
            cmd = new OleDbCommand(strSql, cnn);
            return cmd.ExecuteScalar().ToString().Trim();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
        finally
        {
            cmd.Dispose();
            Close(cnn);
        }
    }

    /// <summary>
    /// 查询（OleDbDataReader）
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <returns>查询结果</returns>
    public OleDbDataReader GetDR(string strSql)
    {
        OleDbConnection cnn = new OleDbConnection(OleDbConnectionString);
        OleDbCommand cmd = new OleDbCommand();
        try
        {
            Open(cnn);
            cmd = new OleDbCommand(strSql, cnn);
            return cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
        finally
        {
            cmd.Dispose();
        }
    }

    /// <summary>
    /// 查询（DataSet）
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <returns>查询结果</returns>
    public DataSet GetDS(string strSql)
    {
        OleDbConnection cnn = new OleDbConnection(OleDbConnectionString);
        OleDbDataAdapter sda = new OleDbDataAdapter();
        try
        {
            Open(cnn);
            sda = new OleDbDataAdapter(strSql, cnn);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            return ds;
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
        finally
        {
            sda.Dispose();
            Close(cnn);
        }
    }

    /// <summary>
    /// 查询（DataSet）
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <param name="tableName">指定DataSet["tableName"]表</param>
    /// <returns>查询结果</returns>
    public DataSet GetDS(string strSql, string tableName)
    {
        OleDbConnection cnn = new OleDbConnection(OleDbConnectionString);
        OleDbDataAdapter sda = new OleDbDataAdapter();
        try
        {
            Open(cnn);
            sda = new OleDbDataAdapter(strSql, cnn);
            DataSet ds = new DataSet();
            sda.Fill(ds, tableName);
            return ds;
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
        finally
        {
            sda.Dispose();
            Close(cnn);
        }
    }

    /// <summary>
    /// 查询（DataTable）
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <returns>查询结果</returns>
    public DataTable GetDT(string strSql)
    {
        return GetDS(strSql).Tables[0];
    }

    /// <summary>
    /// 查询（DataView）
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <returns>查询结果</returns>
    public DataView GetDV(string strSql)
    {
        return GetDS(strSql).Tables[0].DefaultView;
    }

    /// <summary>
    /// 增删改，无图片
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <returns>影响的行数</returns>
    public int RunSql(string strSql)
    {
        OleDbConnection cnn = new OleDbConnection(OleDbConnectionString);
        OleDbCommand cmd = new OleDbCommand();
        try
        {
            Open(cnn);
            cmd = new OleDbCommand(strSql, cnn);
            return cmd.ExecuteNonQuery();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
        finally
        {
            cmd.Dispose();
            Close(cnn);
        }
    }

    /// <summary>
    /// 增改，有图片
    /// </summary>
    /// <param name="strSql">SQL语句</param>
    /// <param name="picbyte">图片的二进制数据</param>
    /// <returns>影响的行数</returns>
    public int RunSql(string strSql, byte[] picbyte)
    {
        OleDbConnection cnn = new OleDbConnection(OleDbConnectionString);
        OleDbCommand cmd = new OleDbCommand();
        try
        {
            Open(cnn);
            cmd = new OleDbCommand(strSql, cnn);
            cmd.Parameters.AddWithValue("@Image", SqlDbType.Image);
            cmd.Parameters["@Image"].Value = picbyte;
            return cmd.ExecuteNonQuery();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
        finally
        {
            cmd.Dispose();
            Close(cnn);
        }
    }
}

2. Image图片与byte[]数组的相互转换

using System.Drawing;
using System.IO;
using System.Drawing.Imaging;

// 将Image转换为二进制序列
public static byte[] ImageToBytes(Image image)
{
    MemoryStream ms = new MemoryStream();
    image.Save(ms, ImageFormat.Jpeg);
    byte[] bytes = new Byte[ms.Length];
    ms.Position = 0;
    ms.Read(bytes, 0, bytes.Length);
    ms.Close();
    return bytes;
}

// 将二进制序列转换为Image
public static Image BytesToImage(byte[] bytes)
{
    try
    {
        using (Stream fStream = new MemoryStream(bytes.Length))
        {
            BinaryWriter bw = new BinaryWriter(fStream);
            bw.Write(bytes);
            bw.Flush();
            Bitmap bitMap = new Bitmap(fStream);
            bw.Close(); 
            fStream.Close();
            Image image = Image.FromHbitmap(bitMap.GetHbitmap());
            return image;
        }
    }
    catch (IOException ex)
    {
        throw new Exception("读取图片失败：" + ex.Message);
    }
}