汽车销售管理系统(总18页) -CAL-FENGHAI.-(YICAI)-Company One1-CAL-本页仅作为文档封面，使用请直接删除2.2功能需求分析经过调研分析，汽车销售管理系统共分为五大块功能。
基础信息管理用于对车辆、厂商及客户信息、管理；采购信息管理用于车辆的采购和维护；销售信息管理用于车辆的销售和维护；信息统计用于对利润的计算；系统维护用于用户的维护。
2.3汽车销售管理系统模块图三、系统设计1）汽车销售管理系统的数据流图图1系统数据流图2）数据字典（1）数据结构：用户=用户名+用户密码+身份；进货单=进货日期+厂商名+原价+进货数量+车型+采购员；车辆=车型+厂商名+备注；客户=用户名+地址+联系电话+e-mail；厂商=厂商名+地址+联系电话+e-mail；销售单=销售日期+客户名+售价+销售数量+车型+销售员；（2）数据项：3、数据流3）概念结构设计E-R图（1）汽车销售管理系统E-R图（2）关系模型用户清单（用户编号，用户名，用户密码，身份）厂商信息（厂商编号，厂商名，地址，联系电话，e-mail）客户信息（客户编号，客户名，地址，联系电话，e-mail）车辆信息（车辆编号，车型，厂商名，备注）进货信息（进货编号，进货日期，厂商名，原价，进货数量，车型，采购员）销售信息（销售编号, 销售日期，客户名，售价，销售数量，车型，销售员）4）数据库设计users用户表firminformation厂商信息表custominformation客户信息表carsinformation车辆信息表buyinformation进货信息表salesinformation销售信息表四、系统实现图1系统登录界面图2管理员后台界面图3采购员操作界面图4销售员操作界面图5厂商信息管理界面图6厂商信息添加界面图7车辆信息管理界面图8车辆信息添加界面图9客户信息管理界面图10客户信息添加界面图11进货单管理界面图12进货信息添加界面图13销售单管理界面图14销售信息添加界面图15销售利润统计界面图16销售数量统计界面图17密码修改界面图18用户信息管理界面图19 新用户添加界面public class SQLHelper{private SqlConnection conn = null;private SqlCommand cmd = null;private SqlDataReader sdr = null;public SQLHelper(){string connStr = @"Data Source=.;Initial Catalog=Carsmamage;Integrated Security=True"; conn = new SqlConnection(connStr);}private SqlConnection GetConn(){if (conn.State == ConnectionState.Closed){conn.Open();}return conn;}public int ExecuteNonQuery(string sql){int res;try{cmd = new SqlCommand(sql, GetConn());res = cmd.ExecuteNonQuery();}catch (Exception){throw;}finally{if (conn.State == ConnectionState.Open){conn.Close();}}return res;}public DataTable ExecuteQuery(string sql){DataTable dt = new DataTable();cmd = new SqlCommand(sql, GetConn());//mandType = CommandType.StoredProcedure;{dt.Load(sdr);}return dt;}public string ExecuteQ(string sql){DataSet ds = new DataSet();string result;cmd = new SqlCommand(sql, GetConn());SqlDataAdapter adapter = new SqlDataAdapter(cmd);try{adapter.Fill(ds);}catch{return null;}result = ds.Tables[0].Rows[0][0].ToString();return result;}}public SQLHelper sqlhelper;public SqlManager(){sqlhelper = new SQLHelper();}public bool Login(string name, string password, string types){bool flag = false;string sql = "select username,userpassword,usertypes from users where username='" + name + "'and userpassword='" + password + "'and usertypes='" + types + "'";DataTable dt = sqlhelper.ExecuteQuery(sql);if (dt.Rows.Count > 0){flag = true;}return flag;}public bool Insert(string Newname, string Newaddress, string Newtelephone, string Newemail){bool flag = false;string sql = "insert into firminformation(firmname,address,telephone,[e-mail])values('" + Newname + "','" + Newaddress + "','" + Newtelephone + "','" + Newemail + "')";if (res > 0){flag = true;}return flag;}public bool Insert(string Carname, string Firmname, string beizhu){bool flag = false;string sql = "insert into carsinformation(carname,firmname,beizhu)values('" + Carname+ "','" +Firmname+ "','" + beizhu+"')";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool Insert1(string Newname, string Newaddress, string Newtelephone, string Newemail) {bool flag = false;string sql = "insert into custominformation(customname,address,telephone,[e-mail])values('" + Newname + "','" + Newaddress + "','" + Newtelephone + "','" + Newemail + "')";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool Insert2(string type, string firm, string number, string money,string date,string name){bool flag = false;string sql = "insert intobuyinformation(buydate,firmname,price,buynumber,cartypes,buyer)values('" +date+ "','" +firm+ "','"+money+ "','" +number+ "','"+type+"','"+name+"')";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool Insert3(string type,string number, string money,string custom, string date, string{bool flag = false;string sql = "insert intosalesinformation(salesdate,customname,theprice,salesnumber,cartypes,salesman)values('" + date + "','" + custom + "','" + money + "','" + number + "','" + type + "','" + name + "')";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool Insert4(string name, string password, string types){bool flag = false;string sql = "insert into users(username,userpassword,usertypes)values('" + name + "','" + password + "','" +types + "')";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool validation(string name){bool flag = false;string sql = "select username from users where username='" + name + "'";DataTable dt = sqlhelper.ExecuteQuery(sql);if (dt.Rows.Count > 0){flag = true;}return flag;}public bool updatepassword(string name,string password){bool flag = false;string sql = "update users set userpassword='"+password+"' where username='"+name+"'";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;public bool delete1(string num){bool flag = false;string sql="delete from firminformation where id='"+num+"'";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool delete2(string num){bool flag = false;string sql = "delete from carsinformation where id='" + num + "'";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool delete3(string num){bool flag = false;string sql = "delete from custominformation where id='" + num + "'";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool delete4(string num){bool flag = false;string sql = "delete from buyinformation where id='" + num + "'";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool delete5(string num)bool flag = false;string sql = "delete from salesinformation where id='" + num + "'";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public bool delete6(string num){bool flag = false;string sql = "delete from users where id='" + num + "'";int res = new SQLHelper().ExecuteNonQuery(sql);if (res > 0){flag = true;}return flag;}public DataTable Sum(){DataTable resulting;string sql = "select cartypes'车型',price'进货价',theprice'售价',salesnumber'售出数量',salesnumber*(theprice-price)'利润合计' from tongji";resulting = new SQLHelper().ExecuteQuery(sql);return resulting;}public DataTable Sun1(string time){DataTable resulting;string sql = "select sum(salesnumber) from salesinformation where salesdate='" + time + "'";resulting = new SQLHelper().ExecuteQuery(sql);return resulting;}}。
