using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.Threading.Tasks;
using?System.Data.SqlClient;
using?System.Data;
namespace?WindowsFormsApplication1
{
????class?Dbhelp
????{
????????//1.連接字符串
????????private?const?string?str?=?“data?source=.;initial?catalog=FlowerSys;user?id=sa;pwd=ok“;
????????//2.創(chuàng)建connection對(duì)象
????????private?SqlConnection?_conn;

????????public?SqlConnection?Conn
????????{
????????????get
????????????{
????????????????if?（_conn?==?null）
????????????????{
????????????????????_conn?=?new?SqlConnection（str）;
????????????????}
????????????????return?_conn;
????????????}
????????}
????????//打開(kāi)數(shù)據(jù)庫(kù)
????????public?void?OpenConn（）
????????{
????????????if?（Conn.State?==?ConnectionState.Closed）
????

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2020-06-05?18:59??WindowsFormsApplication1\
?????文件?????5242880??2020-06-05?14:09??WindowsFormsApplication1\FlowerSys.mdf
?????文件?????2097152??2020-06-05?14:09??WindowsFormsApplication1\FlowerSys_log.ldf
?????目錄???????????0??2020-06-04?15:39??WindowsFormsApplication1\WindowsFormsApplication1\
?????文件?????????962??2020-06-04?14:19??WindowsFormsApplication1\WindowsFormsApplication1.sln
?????文件???????51200??2020-06-05?18:03??WindowsFormsApplication1\WindowsFormsApplication1.v11.suo
?????文件?????????187??2020-06-04?14:19??WindowsFormsApplication1\WindowsFormsApplication1\App.config
?????目錄???????????0??2020-06-04?14:22??WindowsFormsApplication1\WindowsFormsApplication1\bin\
?????目錄???????????0??2020-06-05?14:02??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\
?????文件???????25600??2020-06-04?16:14??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe
?????文件?????????187??2020-06-04?14:19??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe.config
?????文件???????58880??2020-06-04?16:14??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb
?????文件???????22984??2020-06-05?18:01??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe
?????文件?????????187??2020-06-04?14:19??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.config
?????文件?????????490??2019-03-19?12:46??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest
?????目錄???????????0??2020-06-04?14:22??WindowsFormsApplication1\WindowsFormsApplication1\bin\Release\
?????文件????????1299??2020-06-04?14:32??WindowsFormsApplication1\WindowsFormsApplication1\Dbher.cs
?????文件?????????863??2020-06-04?16:10??WindowsFormsApplication1\WindowsFormsApplication1\FrmDengLu.cs
?????文件????????5020??2020-06-04?16:10??WindowsFormsApplication1\WindowsFormsApplication1\FrmDengLu.Designer.cs
?????文件????????6013??2020-06-04?16:10??WindowsFormsApplication1\WindowsFormsApplication1\FrmDengLu.resx
?????文件????????4988??2020-06-04?16:14??WindowsFormsApplication1\WindowsFormsApplication1\FrmXiaoShouXInxin.cs
?????文件???????13386??2020-06-04?15:36??WindowsFormsApplication1\WindowsFormsApplication1\FrmXiaoShouXInxin.Designer.cs
?????文件????????7495??2020-06-04?15:36??WindowsFormsApplication1\WindowsFormsApplication1\FrmXiaoShouXInxin.resx
?????文件????????3014??2020-06-04?16:10??WindowsFormsApplication1\WindowsFormsApplication1\FrmXiuGai.cs
?????文件????????6641??2020-06-04?16:10??WindowsFormsApplication1\WindowsFormsApplication1\FrmXiuGai.Designer.cs
?????文件????????5817??2020-06-04?16:10??WindowsFormsApplication1\WindowsFormsApplication1\FrmXiuGai.resx
?????文件????????2519??2020-06-04?16:11??WindowsFormsApplication1\WindowsFormsApplication1\FrmZengJia.cs
?????文件????????8611??2020-06-04?16:10??WindowsFormsApplication1\WindowsFormsApplication1\FrmZengJia.Designer.cs
?????文件????????5817??2020-06-04?16:10??WindowsFormsApplication1\WindowsFormsApplication1\FrmZengJia.resx
?????目錄???????????0??2020-06-04?14:19??WindowsFormsApplication1\WindowsFormsApplication1\obj\
?????目錄???????????0??2020-06-05?14:02??WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\
............此處省略24個(gè)文件信息