超市采购管理系统

统实施 完成了系统的概念结构及逻辑结构设计之后，就进入了系统的功能模块及相应的代码设计。我是用分层架构设计来设计功能模块及代码的实施过程。 4.1 逻辑架构设计 分层设计代码架构，其中包括与数据库连接的基础代码及相对于个功能实现的操作代码，具体如下图： 由于各窗体的增加、删除、修改及查询操作都采用同样的方式，我就举一例而代之，实现的具体代码如下： namespace 超市采购管理系统.DAL { public class GoodMenthod { SQLHelper sqlhelper = null; MGood mg = null; SqlDataReader dr = null; public GoodMenthod() { sqlhelper = new SQLHelper(); mg = new MGood(); } public bool GoodAdd(MGood mg) { bool flag = false; string sql = "insert into Good values(@gdId ,@gdName ,@gdDw ,@gdjhPrice ,@gdsellPrice ,@cgId,@kcId)"; SqlParameter[] paras = new SqlParameter[] {new SqlParameter ("@gdId",mg.pgdId),new SqlParameter ("@gdName",mg.pgdName), new SqlParameter ("@gdDw",mg.pgdDw),new SqlParameter ("@gdjhPrice",mg.pgdjhPrice),new SqlParameter ("@gdsellPrice",mg.pgdsellPrice), new SqlParameter ("@cgId",mg.pcgId),new SqlParameter("@kcId",mg.pkcId)}; int i = sqlhelper.ExecuteNonQuery(sql, paras); if (i > 0) { flag = true; } return flag; } public bool GoodDelete(string str) { bool flag = false; string sql = "delete from Good where gdId ='" + str + "'"; int i = sqlhelper.exec(sql); if (i > 0) { flag = true; } return flag; } public void GoodFind(Object dataObject) { string str = null; try { str = "select gdId 商品编号,gdName 商品名称,gdDw 计量单位,gdjhPrice 进价,gdsellPrice 计划售价,cgId 所属类别编号,kcId 所属仓库编号 from Good "; DataTable dt = sqlhelper.ExecuteQuery(str); DataGridView dv = (DataGridView)dataObject; dv.DataSource = dt; } catch (Exception e) { MessageBox.Show(e.ToString()); } } public SqlDataReader Fill(string str) { string sql = "select * from Good where gdId= '" + str + "'"; SqlCommand cmd = new SqlCommand(); using (cmd = new SqlCommand(sql, sqlhelper.GetConn())) { dr = cmd.ExecuteReader(); } return dr; } public void GoodFind(string s, string str, Object dataObject) { string sql = null; try { switch (s) { case "商品编号": sql = "select gdId 商品编号,gdName 商品名称,gdDw 计量单位,gdjhPrice 进价,gdsellPrice 计划售价 ,cgId 所属类别编号,kcId 所属仓库编号 from Good where gdId = '" + str + "'"; break; case "商品名称": sql = "select gdId 商品编号,gdName 商品名称,gdDw 计量单位,gdjhPrice 进价,gdsellPrice 计划售价 ,cgId 所属类别编号,kcId 所属仓库编号 from Good where gdName = '" + str + "'"; break; case "查询所有信息": sql = "select gdId 商品编号,gdName 商品名称,gdDw 计量单位,gdjhPrice 进价,gdsellPrice 计划售价 ,cgId 所属类别编号,kcId 所属仓库编号 from Good "; break; } DataTable dt = sqlhelper.ExecuteQuery(sql); System.Windows.Forms.DataGridView dv = (DataGridView)dataObject; dv.DataSource = dt; } catch (Exception ee) { MessageBox.Show(ee.Message); } } } } 其中传递该方法用到的实体类如下： namespace 超市采购管理系统.Model { public class MGood { private string gdId; private string gdName; private string gdDw; private string gdjhPrice; private string gdsellPrice; private string cgId; private string kcId; public string pgdId { get { return gdId; } set { gdId = value; } } public string pgdName { get { return gdName; } set { gdName = value; } } public string pgdDw { get { return gdDw; } set { gdDw = value; } } public string pgdjhPrice { get { return gdjhPrice; } set { gdjhPrice = value; } } public string pgdsellPrice { get { return gdsellPrice; } set { gdsellPrice = value; } } public string pcgId { get { return cgId; } set { cgId = value; } } public string pkcId { get { return kcId; } set { kcId = value; } } } }