c# 连接oracle 读取数据

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OracleClient;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace PDM {
    public partial class BaseInfo : Form {
        public BaseInfo() {
            InitializeComponent();
            this.tbxFilePath.Text = "d:/TestPicture/ln/";
            this.hash.Text = "d:/TestPicture/ln/";
            this.server.Text = "PDMFiles/FMSC/";
        }
        List<SpareBaseInfo> SpareBaseInfos = null;
        List<SpareBaseInfo> SpareBaseInfoDataBases = null;
        List<SpareBaseInfo> SpareBaseInfoisexist= null;

        StreamWriter sw = File.AppendText(Environment.CurrentDirectory + "\\SpareBaseInfoFile.txt");
      
        private void UpdateDataBase_Click(object sender, EventArgs e) {
            try {
                var updatesql = new StringBuilder();
                SpareBaseInfos = new List<SpareBaseInfo>();
                SpareBaseInfoDataBases = new List<SpareBaseInfo>();
                SpareBaseInfoisexist = new List<SpareBaseInfo>();
                foreach(var item in Directory.GetFiles(this.tbxFilePath.Text)) {
                    var extenname = Path.GetFileName(item);
                    var name = Path.GetFileNameWithoutExtension(item);
                    if(name.Contains("#")) {
                        string[] codename = name.Split(‘#‘);
                        SpareBaseInfo sbi = new SpareBaseInfo();
                        sbi.Code = codename[0].ToString();
                        sbi.Name = codename[1].ToString();
                        sbi.FilePath = this.server.Text + extenname;
                        if(!SpareBaseInfos.Contains(sbi)) {
                            SpareBaseInfos.Add(sbi);
                        }
                        updatesql.AppendLine("update SpareBaseInfo set FilePaths=‘" + server.Text + extenname + "‘" + "where code=‘" + sbi.Code + "‘ and name= ‘" + sbi.Name + "‘;");
                        if(!File.Exists(this.hash.Text + extenname.GetHashCode())) {
                            Directory.CreateDirectory(this.hash.Text + Math.Abs(extenname.GetHashCode()) % 1000);
                        }
                        File.Copy(item, this.hash.Text + Math.Abs(extenname.GetHashCode()) % 1000 + "/" + extenname);
                    }
                } 
                sw.Write(updatesql.ToString());
                MessageBox.Show("成功");
                sw.Close();

            } catch(Exception ex) {
                
                throw ex;
            }

            string sql = "select * from SpareBaseInfo where code in (";
            var Codes = SpareBaseInfos.Select(l => l.Code);
            foreach(var item in Codes) {
                sql += "‘" + item + "‘,";
            }
            if(!string.IsNullOrEmpty(sql)) {
                sql = sql.Remove(sql.Length - 1);
            }
            sql += ")";

            sql += "and name in(";
            var Names = SpareBaseInfos.Select(l => l.Name);
            foreach(var item in Names) {
                sql += "‘" + item + "‘,";
            }
            if(!string.IsNullOrEmpty(sql)) {
                sql = sql.Remove(sql.Length - 1);
            }
            sql += ")";
            string conn = "user id=mfepc;data source=" + server.Text + ";password=mfepc";
            OracleConnection cn = new OracleConnection(conn);
            cn.Open();//要打开连接   
            string strcmd = sql;
            OracleCommand cmd = new OracleCommand(strcmd, cn);
            OracleDataReader reader = cmd.ExecuteReader();
            try {
                while(reader.Read()) {
                    var a = reader[0].ToString();
                    SpareBaseInfo sbi = new SpareBaseInfo();
                    sbi.Id = Convert.ToInt32(reader["Id"].ToString());
                    sbi.Code = reader["Code"].ToString();
                    sbi.Name = reader["Name"].ToString();
                    if(!SpareBaseInfoDataBases.Contains(sbi)) {
                        SpareBaseInfoDataBases.Add(sbi);
                    }
                }
                dataGridView1.DataSource = SpareBaseInfoDataBases;
            } finally {
                reader.Close();
            }
            var updatesql = new StringBuilder();
            try {
                if(MessageBox.Show(SpareBaseInfoDataBases.Count() + "条数据是否继续", "确认", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == System.Windows.Forms.DialogResult.Yes) {
                    updatesql.AppendLine("begin");
                    foreach(var item in SpareBaseInfoDataBases) {
                        item.FilePath = SpareBaseInfos.FirstOrDefault(l => l.Name == item.Name && l.Code == item.Code).FilePath;
                        updatesql.AppendLine("update SpareBaseInfo set FilePaths=‘" + item.FilePath + "‘" + "where code=‘" + item.Code + "‘ and name= ‘" + item.Name + "‘;");
                    }
                    updatesql.AppendLine("end;");
                    //OracleCommand cmdupdate = new OracleCommand(updatesql.ToString(), cn);
                    //cmdupdate.ExecuteNonQuery();
                    MessageBox.Show("成功");
                }

            } catch(Exception ecp) {
                throw ecp;
            }

            cn.Close();
        }
    }

    public class SpareBaseInfo {

        private int id;

        public int Id {
            get {
                return id;
            }
            set {
                id = value;
            }
        }

        private string code;

        public string Code {
            get {
                return code;
            }
            set {
                code = value;
            }
        }

        private string name;

        public string Name {
            get {
                return name;
            }
            set {
                name = value;
            }
        }

        private string filePath;

        public string FilePath {
            get {
                return filePath;
            }
            set {
                filePath = value;
            }
        }
        //通过DataSet来读取数据：

        //创建和数据库的连接192.168.17.42/epcv2
        //OracleConnection oraCon = new OracleConnection("user id=mfepc0521;data source=192.168.17.42/mfdmstest;password=mfepc0521");
        //OracleConnection oraCon = new OracleConnection("user id=mfepc;data source=192.168.17.42/epcv2;password=mfepc");
        //OracleDataAdapter oraDap = new OracleDataAdapter("select * from SpareBaseInfo where rownum<10", oraCon);
        //DataSet ds = new DataSet();
        //oraDap.Fill(ds);
        //DataTable _table = ds.Tables[0];
        //int count = _table.Rows.Count;
        //dataGridView1.DataSource = _table;
    }
}