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这几天学习数据库操作,就自己封装了一个数据库操作类,下面是代码展示

也可能用在Sql数据库中,只在在第一行代码上修改标识符即可

#define OLEDB_

using System;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
namespace MYDATACLASS
{
#if OLEDB_
    using MyCommand = OleDbCommand;
    using MyConnection = OleDbConnection;
    using MyDataAdapter = OleDbDataAdapter;
    using MyDataRead = OleDbDataReader;
    using MyParameter = OleDbParameter;

#elif SQL_
    using MyCommand = SqlCommand;
    using MyConnection = SqlConnection;
    using MyDataAdapter = SqlDataAdapter;
    using MyCommandBuilder = SqlCommandBuilder;
    using MyParameter = SqlParameter;
    using MyDataRead = SqlDataReader;

//....
#endif

    /// <summary>
    /// 封装对数库操作的静态方法类
    /// <para>GetTable 获得要查询的DataTable表</para>
    /// <para>GetDataSet 获得查询的DataSet表的集合</para>
    /// <para>GetDataRead 获得查询的DataRead对象</para>
    /// <para>ExecuteNonQuery 执行数据的增,删,改等操作</para>
    /// <para>ImageToByte,BetyToImage,字节byte[]和Image相互转换</para>
    /// <para>版权:greenleaf1976</para>
    /// <para>创建时间:2021-07-16</para>
    /// </summary>
    public class BaseADO
    {
        public static MyConnection conn = null;

        public static string Conn_String= @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\MyAccessFile\newToxinlu.accdb";

        public BaseADO() { }

        ~BaseADO()
        {
            conn.Dispose();
            //CloseConn();
        }

        /// <summary>
        /// 初始化Conn对象,并打开连接
        /// </summary>
        private static void InitConnection()
        {
            if (conn == null)
                conn = new MyConnection(Conn_String);
            if (conn.State == ConnectionState.Closed)
                conn.Open();
            if(conn.State==ConnectionState.Broken)
            {
                conn.Close();
                conn.Open();
            }
        }

        /// <summary>
        /// 获得查询结果的表,如果只想用Sql语句,后面参数可省略
        /// <para>如果用Sql+参数列表查询,格式为:</para>
        /// <para>(sql,mPars:pars)格式跳过中间的参数,也就是给指定的参数赋值</para>
        /// </summary>
        /// <param name="sqlStr">Sql语句或是储存过程名</param>
        /// <param name="cmdType">选择用Sql语句还是储存过程查询</param>
        /// <param name="mPars">参数列表</param>
        /// <returns></returns>
        public static DataTable GetDataTable(string sqlStr, CommandType cmdType = CommandType.Text, params MyParameter[] mPars)
        {
            InitConnection();
            DataTable dt = new DataTable();
            MyCommand cmd = null;
            MyDataAdapter da = null;
            try
            {
                cmd = new MyCommand(sqlStr, conn);
                cmd.CommandType = cmdType;
                if(mPars.Length!=0)
                {
                    cmd.Parameters.Clear();
                    cmd.Parameters.AddRange(mPars);
                }
                da = new MyDataAdapter(cmd);
                da.Fill(dt);
            }
            catch (System.Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                da.Dispose();
                cmd.Dispose();
                conn.Close();
            }

            return dt;
        }

        /// <summary>
        /// 获得Sql语句或是储存过程查询的表的集合
        /// </summary>
        /// <param name="sqlStr">Sql语句或是储存过程名</param>
        /// <param name="cmdType">是用Sql语句还是储存过程查询</param>
        /// <param name="mPars">参数列表</param>
        /// <returns>查询表的集合DataSet</returns>
        public static DataSet GetDataSet(string sqlStr, CommandType cmdType = CommandType.Text, params MyParameter[] mPars)
        {
            InitConnection();
            DataSet ds = new DataSet();
            MyDataAdapter da = null;
            MyCommand cmd = null;
            try
            {
                cmd = new MyCommand();
                cmd.CommandText = sqlStr;
                cmd.Connection = conn;
                cmd.CommandType = cmdType;
                if(mPars.Length!=0)
                {
                    cmd.Parameters.Clear();
                    cmd.Parameters.AddRange(mPars);
                }
                da = new MyDataAdapter(cmd);
                da.Fill(ds);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                cmd.Dispose();
                da.Dispose();
                conn.Close();
            }
            return ds;
        }
        /// <summary>
        /// 通过Sql语句查询,返回DataRead对象
        /// <para>不能断开连接,查询后手动关闭连接</para>
        /// <para>多用于递归加载数据用</para>
        /// </summary>
        /// <param name="sqlStr"></param>
        /// <returns></returns>
        public static MyDataRead GetDataRead(string sqlStr,CommandType cmdType=CommandType.Text,params MyParameter[] pras)
        {
            InitConnection();
            MyDataRead dr = null;
            MyCommand cmd = null;
            try
            {
                cmd = new MyCommand(sqlStr, conn);
                cmd.CommandType = cmdType;
                dr = cmd.ExecuteReader();
            }
            catch (System.Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            return dr;
        }

        /// <summary>
        /// 用Sql语句,参数列表对数据库的
        /// Insert,Update,Delete执行操作
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="mPars"></param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string sql,CommandType cmdType=CommandType.Text, params MyParameter[] mPars)
        {
            InitConnection();
            int nRet = 0;
            MyCommand cmd = null;
            try
            {
                cmd = new MyCommand(sql, conn);
                cmd.CommandType = cmdType;
                if(mPars.Length!=0)
                {
                    cmd.Parameters.Clear();
                    cmd.Parameters.AddRange(mPars);
                }
                nRet =cmd.ExecuteNonQuery();
            }
            catch (System.Exception ex)
            {

                MessageBox.Show(ex.Message);
            }
            finally
            {
                cmd.Dispose();
                conn.Close();
            }
            return nRet;
        }

        /// <summary>
        /// 图片(Image)格式转为字节(byte[])格式
        /// </summary>
        /// <param name="_image"></param>
        /// <returns></returns>
        public static byte[] ImageToByte(Image _image)
        {
            MemoryStream ms = new MemoryStream();
            _image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            return ms.ToArray();
        }

        /// <summary>
        /// 字节(byte[])转为图片(Image)格式
        /// </summary>
        /// <param name="buff"></param>
        /// <returns></returns>
        public static Image BetyToImage(byte[] buff)
        {
            MemoryStream memoryStream = new MemoryStream(buff, 0, buff.Length);
            memoryStream.Write(buff, 0, buff.Length);
            Image image = null;
            try
            {
                //字节数组转成Image对象
                image = Image.FromStream(memoryStream);
            }
            catch (Exception)
            {
                throw;
            }
            return image;
        }
    }
基本上有这几个方法就能操作数据库了.

特别要说的是GetDataRead()这个方法是要连接数据库操作的,一般我用在数据递归中

最后递归完了手动关闭连接,其他的方法都是断开连接操作的,函数返回前就关闭了连接,

所以在外面调用的时候就不用关闭数据库连接了.

在写个类继承BaseADO类,在子类写实际的数据库操作方法

下面以修改数据库数据为例;

/// <summary>
        /// 更新指定id的数据库数据
        /// </summary>
        /// <param name="stu">要更新的数据结构</param>
        /// <param name="id">要更新的查询id</param>
        /// <returns></returns>
        public static int UpdateAllData(STUDENT_INFO stu,string id)
        {
            string sql = "update {0} set mName=@name,mSex=@sex,mAge=@age,mTel=@tel,";
            sql += "mFenZu =@fenzu,mBirthday=@birthday,mQQ=@qq,mAddess=@addess,";
            sql += "mBeiZu =@beizu,mPicBytes=@picbytes where mID=@mid";
            sql = string.Format(sql, MYTABLE_NAME);
            //STUDENT_INFO stu = GetDataToStudentInfo();

            MyParameter[] pars =
            {
                new MyParameter("@name",stu.name),
                new MyParameter("@sex",stu.sex),
                new MyParameter("@age",stu.age),
                new MyParameter("@tel",stu.tel),
                new MyParameter("@fenzu",stu.fenzu),
                new MyParameter("@birthday",stu.birthday),
                new MyParameter("@qq",stu.qq),
                new MyParameter("@addess",stu.addess),
                new MyParameter("@beizu",stu.beizu),
                new MyParameter("@picbytes",stu.picBytes),
                new MyParameter("@mid",id)
            };

            return ExecuteNonQuery(sql, mPars:pars);
        }
是后调用的这个ExecuteNonQuery()方法的参数要注意,因中间还有一个参数有默认值,