【正文】 ed the concept behind the model) and the goal of information systems used to explain other aspects of the model of consistency categories, such as processing steps, rules and data processing time of timing. However, even if the concept is such detailed data model is only preliminary, because followup information system life cycle activities in the design of services, statements, display and inquiries may find that missing element or mistakes. Therefore, the concept of data often said that modeling is a topdown manner, its areas of operation from the general understanding of the driver, rather than the specific information processing activities by the driver. 3. Logical Database Design Logical database design from two perspectives database development. First, the concept of data model transform into relational database theory based on the criteria that means between. Then, as the design of information systems, every puter procedures (including procedures for the input and output format), database support services, statements, and inquiries revealed that a detailed examination. In this socalled Bottomup analysis, accurate verification of the need to maintain the database and the data in each affairs, statements and so on the needs of those in the nature of the data. For each separate statements, services, and so on the analysis must take into account a specific, limited but plete database view. When statements, services, and other analysis might be necessary to change the concept of data model. Especially in largescale projects, the different analytical systems development staff and the team can work independently in different procedures or in a centralized, the details of their work until all the logic design stage may be displayed. In these circumstances, logic database design stage must be the original concept of data model and user view these independent or merged into a prehensive design. In logic design information systems also identify additional information processing needs of these new demands at this time must be integrated into the logic of earlier identified in the database design. Logical database design is based on the final step for the formation of good data specifications and determine the rules, the bination, the data after consultation specifications or converted into basic atomic element. Most of today39。Information System Development and Database DevelopmentIn many organizations, database development from the beginning of enterprise data modeling, data modeling enterprises determine the scope of the database and the general content. This step usually occurs in an organization39。 公共類設計 在開發(fā)項目中以類的形式來組織、封裝一些常用的方法和事件，不僅可以提高代碼的重用率，而且還大大方便了代碼的管理。房源狀態(tài)查詢窗體的運行結果如圖55所示。 房源信息設置模塊設計 本模塊使用的數(shù)據(jù)表：tb_house 、tb_favor 、tb_fitment、tb_floor、tb_mothed、tb_seat 、tb_type 房源信息設置模塊用于設置房源的基本信息，它將多個基礎表的信息和房屋表進行有機結合，通過視圖view_house 把信息呈現(xiàn)給用戶，本系統(tǒng)較為人性化的功能也在這里體現(xiàn)，即出租人在添加房源信息時，后臺通過存儲過程 proc_house_insert 為客戶查找理想的房屋信息，如果有符合的信息，則會顯示該信息，用戶可以根據(jù)提示找到求租人，這樣便做到了用最少的時間完成最有效的工作。通過主窗體，用戶可以調用系統(tǒng)相關的各子模塊，快速掌握本系統(tǒng)中所實現(xiàn)的各個功能。 else set ID=39。log39。 觸發(fā)器 trig_insetOfEmployeeinLogin 觸發(fā)器為 Insert 觸發(fā)器，當系統(tǒng)操作員向員工信息表中添加新員工信息時 將觸發(fā)該觸發(fā)器，然后在系統(tǒng)登錄表中自動插入員工信息并進行初始化，其 SQL 代碼如下。存儲過程存儲在數(shù)據(jù)庫內，可通過來自應用程序的調用執(zhí)行，并且支持用戶聲明的變量、有條件執(zhí)行以及其他強大的編程功能。167。（4） 實現(xiàn)后臺監(jiān)控功能。（5）使用垃圾信息處理機制釋放空間。綜上所述，本系統(tǒng)的設計與開發(fā)在技術上和硬件設備上的條件都是滿足的，因此，它在技術上是可行的。Visual Studio 可行性分析167。運行平臺：Windows7/Windows XP(SP2)。此外，幫助建立一種基于用戶Form的驗證方式，通過Cookies用戶的應用程序可以用自己的代碼和邏輯實現(xiàn)用戶定義的可信性驗證。，是一個已編譯的、（包括C.NET、Visual ）創(chuàng)作應用程序。一類是強制性系統(tǒng)，它要求參加該系統(tǒng)的成員將自己所獲得的獨家銷售委托在規(guī)定的時間內必須輸入網絡中心；另一種類型的自愿的，就是系統(tǒng)的成員根據(jù)自己的需要決定是否將所獲得的獨家銷售委托輸入網絡中心。 為了規(guī)范市場秩序，給消費者創(chuàng)造一個更加清晰、公平、便利的求租過程 ，我決定設計一個房屋中介管理系統(tǒng)，使大家能夠更加方便、快捷、安全的找到適合自己心儀的房子。 房屋中介管理信息系統(tǒng)在全球范圍內都得到了廣泛的應用：在法國房屋中介利用該系統(tǒng)實現(xiàn)從幫助尋找客戶到簽約、管理等“一條龍”服務。 系統(tǒng)主窗體設計 15167。 系統(tǒng)目標 7167。 C編程簡介 3167。 開發(fā)環(huán)境簡介 3167。 系統(tǒng)功能結構圖 7167。 用戶信息管理模塊 15167。在美國，隨著計算機和互聯(lián)網的發(fā)展，MLS（Multiple Listing Service即多重上市服務）的應用程序逐漸代替了紙張抄寫房源信息的方法。房屋中介管理系統(tǒng)是一個房屋中介機構不可缺少的一部分，它能夠為 操作人員和用戶提供充足的信息 和快速查詢手段。167。因此Web應用程序開發(fā)人員可以利用整個平臺的威力和靈活性。，利用這些工具，我們可以方便地設計站點，允許用戶通過Web頁與數(shù)據(jù)庫進行交互。運行環(huán)境： Framework SDK 。 經濟可行性現(xiàn)在，計算機的配件不斷在更新，性能也變得越來越好，同時其價格正在逐漸下降。.NET 是一套完整的開發(fā)工具，用于生成 ASP Web 應用程序、XML Web services、桌面應用程序和移動應用程序。167。（6）在相應的權限下，可方便的刪除數(shù)據(jù)。（5） 實現(xiàn)各種查詢，如定位查詢、模糊查詢等。 數(shù)據(jù)庫分析房屋中介管理系統(tǒng)主要用來記錄客戶房屋的出租及求租等信息，數(shù)據(jù)量是根據(jù)房屋信息的多少來決定的， 如果房屋信息的記錄很多，那將會占用很大的數(shù)據(jù)庫空間，因此本系統(tǒng)采用SQL Server 2000作為后臺數(shù)據(jù)庫，數(shù)據(jù)庫名稱為 db_showHouse，其中包含 15 張數(shù)據(jù)表，用于存儲不同的信息，詳細信息如圖41所示圖41房屋中介管理系統(tǒng)中用到的數(shù)據(jù)表 167。存儲過程可以接收和輸出參數(shù)，返回執(zhí)行存儲過程的狀態(tài)值，而且還可以嵌套調用。IF EXISTS (SELECT name FROM sysobjects WHERE name = 39。+cast(substring(lid,4,4)+1 as varchar(10)) select led=employee_ID,lna=employee_name from inserted set lpw=39。Tlog39。房屋中介管理系統(tǒng)的主窗體被分為 5 個部分：最上方是系統(tǒng)菜單欄，可以通過它調用系統(tǒng)中的所有子窗體；菜單欄下方是工具欄，以按鈕的形式調用最常用的子窗體；窗體的左側是一個樹型列表，可以通過它顯示系統(tǒng)的所有功能；窗體的右側是一個和程序主題相關的背景圖片；窗體的最下方用狀態(tài)欄顯示當前登錄的用戶名及系統(tǒng)時間。房源信息設置窗體的運行結果如圖53所示。 圖55房源狀態(tài)查詢窗體的運行結果167。本系統(tǒng)中創(chuàng)建了公共類 ClsCon ，并且還為每個數(shù)據(jù)表建立了自己的實體類和方法類。s information system planning process, it aims to help organizations create an overall data description or explanation, and not the design of a specific database. A specific database for one or more information systems provide data and the corporate data model (which may involve a number of databases) described by the organization maintaining the scope of the data. Data modeling in the enterprise, you review of the current system, the need to support analysis of the nature of the business areas, the need for further description of the abstract data, and planning one or more database development project. Figure 1 shows Pine Valley furniture pany39。s information system blueprint. In the information system planning, you can build an enterprise data model as a whole information system architecture part. According to Zachman (1987), Sowa and Zachman (1992) views of an information system architecture consists of the following six key ponents: Data (Figure 1 shows, but there are other me