OracleSqlHelpr编写

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

using System.Configuration;
using System.Data;
using System.Data.OracleClient;//需要手动导入Bin

/// <summary>
///DBHelper 的摘要说明
/// </summary>
public class DBHelper
{
    string conStr = "";

    public DBHelper()
    {
        conStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        //需要配置web.config文件 connectionStrings
        //ConfigurationManager.AppSettings["password"];获取当前应用程序默认配置的AppSettingsSection数据。

        //客户端和数据库不在同一台机器，可以使用下面的连接方式 
        //using System.Data.OleDb; 
        //HOST是Oracle数据库服务器地址，PORT是Oracle数据库端口，SERVICE_NAME是数据库名称 
        //string connStr = "Provider=OraOLEDB.Oracle.1;Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = orcl)));User ID=message;Password=message;"; 
        //OleDbConnection conn = new OleDbConnection(connStr); 
    }

    #region 数据库操作
    public object ExcuteScalar(string sql)
    {
        object obj = null;
        //创建一个数据库连接
        OracleConnection conn = new OracleConnection(conStr);
        //打开数据库
        conn.Open();
        //创建数据库命令
        OracleCommand cmd = new OracleCommand(sql, conn);
        //执行数据库操作
        obj = cmd.ExecuteScalar();
        //关闭连接
        conn.Close();
        //销毁连接
        conn.Dispose();

        return obj;
    }

    public int ExecuteNonQuery(string sql)
    {
        int result = 0;
        OracleConnection conn = new OracleConnection(conStr);
        conn.Open();

        OracleCommand cmd = new OracleCommand(sql, conn);
        result = cmd.ExecuteNonQuery();

        conn.Close();
        conn.Dispose();

        return result;
    }

    public DataTable ExecuteDataTable(string sql)
    {
        DataTable result = new DataTable();
        OracleConnection conn = new OracleConnection(conStr);
        conn.Open();

        OracleCommand cmd = new OracleCommand(sql, conn);
        OracleDataAdapter oda = new OracleDataAdapter(cmd);
        oda.Fill(result);

        conn.Close();
        conn.Dispose();

        return result;
    }

    public DataSet ExecuteDataSet(string sql)
    {
        DataSet result = new DataSet();

        OracleConnection conn = new OracleConnection(conStr);
        conn.Open();

        OracleCommand cmd = new OracleCommand(sql, conn);
        OracleDataAdapter oda = new OracleDataAdapter(cmd);
        oda.Fill(result);

        conn.Close();
        conn.Dispose();

        return result;

    }

    public List<WJ> GetWJs(string sql)
    {
        List<WJ> wjs = new List<WJ>();
        OracleDataReader result = null;

        OracleConnection conn = new OracleConnection(conStr);
        conn.Open();
        OracleCommand cmd = new OracleCommand(sql, conn);
        //从数据库中读取数据流存入result中
        result = cmd.ExecuteReader();

        while (result.Read())
        {
            WJ wj = new WJ();

            //result.GetOrdinal("id")是得到ID所在列的index, 
            //result.GetInt32(int n)这是将第n列的数据以Int32的格式返回 
            //result.GetString(int n)这是将第n列的数据以string 格式返回
            //result.GetDateTime(int n)这是将第n列的数据以string 格式返回

            //判断数据是否为空
            //objId != DBNull.Value判断对象是否为空
            //!Convert.IsDBNull(objScsj)判断DateTime是否为空
            //对象.IsNull("字段")
            //对象.ToString() == ""
            var objId = result.GetValue(result.GetOrdinal("id"));
            if (objId != DBNull.Value)
            {
                wj.id = objId.ToString();
            }
            var objWjname = result.GetValue(result.GetOrdinal("wjname"));
            if (objWjname != DBNull.Value)
            {
                wj.wjname = objWjname.ToString();
            }
            var objWjjid = result.GetValue(result.GetOrdinal("wjjid"));
            if (objWjjid != DBNull.Value)
            {
                wj.wjjid = objWjjid.ToString();
            }
            var objSize = result.GetValue(result.GetOrdinal("size"));
            if (objSize != DBNull.Value)
            {
                wj.size = objSize.ToString();
            }
            var objRoute = result.GetValue(result.GetOrdinal("route"));
            if (objRoute != DBNull.Value)
            {
                wj.route = objRoute.ToString();
            }
            var objScsj = result.GetDateTime(result.GetOrdinal("scsj"));
            if (!Convert.IsDBNull(objScsj))
            {
                wj.scsj = objScsj.ToString("yyyy-MM-dd HH:mm:ss");
            }

            //格式化输出数据
            //Console.Write("ID:{0},Name:{1},PWD:{2},Age:{3},Sex:{4},Phone{5},Address:{6}\n", id, name, pwd, age, sex, phone, address);
            wjs.Add(wj);
        }

        conn.Close();
        conn.Dispose();
        return wjs;
    }
    #endregion
}

　　

1、问题在数据库中有一条数据类型是DateTime，C#中该数据是string类型的。

　　解决方案：在从数据库接收该数据时，将它转换为DateTime的，再用 .ToString(" 格式 "）这个方法将该数据转换为带格式的String数据