PL/I 虚拟房地产管理系统代码技术解析
PL/I（Programming Language One）是一种高级程序设计语言，由IBM于1964年推出。它旨在提供一种既适用于科学计算又适用于商业应用的通用编程语言。尽管PL/I在现代编程语言中不再流行，但在某些特定领域，如大型系统编程和数据处理，它仍然有其应用价值。本文将围绕PL/I语言，探讨如何构建一个虚拟房地产管理系统，并展示相关代码技术。
系统概述
虚拟房地产管理系统是一个用于管理房地产信息、交易和租赁的系统。它可以帮助房地产公司、经纪人或个人用户高效地管理房源、客户信息、交易记录等。以下是一个基于PL/I的虚拟房地产管理系统的基本架构：
1. 数据库管理：存储房源信息、客户信息、交易记录等。
2. 房源管理：添加、修改、删除房源信息。
3. 客户管理：添加、修改、删除客户信息。
4. 交易管理：记录交易信息，包括买卖、租赁等。
5. 报表生成：生成各种报表，如房源统计、交易统计等。
数据库设计
在PL/I中，我们可以使用数据库管理系统（DBMS）来存储和管理数据。以下是一个简单的数据库设计示例：
pl/i
IDENTIFICATION DIVISION.
PROGRAM-ID. REAL_ESTATE_DB.
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT REAL_ESTATE_FILE ASSIGN TO "REAL_ESTATE.DAT"
ORGANIZATION IS SEQUENTIAL
ACCESS MODE IS SEQUENTIAL.
DATA DIVISION.
FILE SECTION.
FD REAL_ESTATE_FILE.
01 REAL_ESTATE-RECORD.
05 PROPERTY-ID PIC X(10).
05 PROPERTY-ADDRESS PIC X(50).
05 PROPERTY-TYPE PIC X(20).
05 PROPERTY-PRICE PIC 9(10).99.
05 PROPERTY-STATUS PIC X(10).
在这个例子中，我们定义了一个名为`REAL_ESTATE_FILE`的文件，用于存储房源信息。每个记录包含物业ID、地址、类型、价格和状态。
房源管理模块
房源管理模块负责添加、修改和删除房源信息。以下是一个简单的房源管理模块的代码示例：
pl/i
IDENTIFICATION DIVISION.
PROGRAM-ID. PROPERTY-MANAGEMENT.
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT REAL_ESTATE_FILE ASSIGN TO "REAL_ESTATE.DAT".
DATA DIVISION.
FILE SECTION.
FD REAL_ESTATE_FILE.
01 REAL_ESTATE-RECORD.
05 PROPERTY-ID PIC X(10).
05 PROPERTY-ADDRESS PIC X(50).
05 PROPERTY-TYPE PIC X(20).
05 PROPERTY-PRICE PIC 9(10).99.
05 PROPERTY-STATUS PIC X(10).
WORKING-STORAGE SECTION.
01 WS-PROPERTY-RECORD.
05 WS-PROPERTY-ID PIC X(10).
05 WS-PROPERTY-ADDRESS PIC X(50).
05 WS-PROPERTY-TYPE PIC X(20).
05 WS-PROPERTY-PRICE PIC 9(10).99.
05 WS-PROPERTY-STATUS PIC X(10).
PROCEDURE DIVISION.
PERFORM ADD-PROPERTY.
PERFORM MODIFY-PROPERTY.
PERFORM DELETE-PROPERTY.
STOP RUN.
ADD-PROPERTY.
DISPLAY "Enter Property ID: ".
ACCEPT WS-PROPERTY-ID.
DISPLAY "Enter Property Address: ".
ACCEPT WS-PROPERTY-ADDRESS.
DISPLAY "Enter Property Type: ".
ACCEPT WS-PROPERTY-TYPE.
DISPLAY "Enter Property Price: ".
ACCEPT WS-PROPERTY-PRICE.
DISPLAY "Enter Property Status: ".
ACCEPT WS-PROPERTY-STATUS.
WRITE REAL_ESTATE-RECORD FROM WS-PROPERTY-RECORD.
MODIFY-PROPERTY.
DISPLAY "Enter Property ID to modify: ".
ACCEPT WS-PROPERTY-ID.
READ REAL_ESTATE_FILE INTO WS-PROPERTY-RECORD.
IF WS-PROPERTY-ID = WS-PROPERTY-RECORD.PROPERTY-ID
DISPLAY "Enter new Property Address: ".
ACCEPT WS-PROPERTY-ADDRESS.
DISPLAY "Enter new Property Type: ".
ACCEPT WS-PROPERTY-TYPE.
DISPLAY "Enter new Property Price: ".
ACCEPT WS-PROPERTY-PRICE.
DISPLAY "Enter new Property Status: ".
ACCEPT WS-PROPERTY-STATUS.
REWRITE REAL_ESTATE-RECORD FROM WS-PROPERTY-RECORD.
ELSE
DISPLAY "Property ID not found".
END-IF.
DELETE-PROPERTY.
DISPLAY "Enter Property ID to delete: ".
ACCEPT WS-PROPERTY-ID.
READ REAL_ESTATE_FILE INTO WS-PROPERTY-RECORD.
IF WS-PROPERTY-ID = WS-PROPERTY-RECORD.PROPERTY-ID
DELETE REAL_ESTATE-RECORD.
ELSE
DISPLAY "Property ID not found".
END-IF.
在这个模块中，我们定义了三个子程序：`ADD-PROPERTY`、`MODIFY-PROPERTY`和`DELETE-PROPERTY`，分别用于添加、修改和删除房源信息。
客户管理模块
客户管理模块负责添加、修改和删除客户信息。以下是一个简单的客户管理模块的代码示例：
pl/i
IDENTIFICATION DIVISION.
PROGRAM-ID. CUSTOMER-MANAGEMENT.
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT REAL_ESTATE_FILE ASSIGN TO "REAL_ESTATE.DAT".
DATA DIVISION.
FILE SECTION.
FD REAL_ESTATE_FILE.
01 REAL_ESTATE-RECORD.
05 PROPERTY-ID PIC X(10).
05 PROPERTY-ADDRESS PIC X(50).
05 PROPERTY-TYPE PIC X(20).
05 PROPERTY-PRICE PIC 9(10).99.
05 PROPERTY-STATUS PIC X(10).
WORKING-STORAGE SECTION.
01 WS-CUSTOMER-RECORD.
05 WS-CUSTOMER-ID PIC X(10).
05 WS-CUSTOMER-NAME PIC X(50).
05 WS-CUSTOMER-CONTACT PIC X(20).
PROCEDURE DIVISION.
PERFORM ADD-CUSTOMER.
PERFORM MODIFY-CUSTOMER.
PERFORM DELETE-CUSTOMER.
STOP RUN.
ADD-CUSTOMER.
DISPLAY "Enter Customer ID: ".
ACCEPT WS-CUSTOMER-ID.
DISPLAY "Enter Customer Name: ".
ACCEPT WS-CUSTOMER-NAME.
DISPLAY "Enter Customer Contact: ".
ACCEPT WS-CUSTOMER-CONTACT.
WRITE REAL_ESTATE-RECORD FROM WS-CUSTOMER-RECORD.
MODIFY-CUSTOMER.
DISPLAY "Enter Customer ID to modify: ".
ACCEPT WS-CUSTOMER-ID.
READ REAL_ESTATE_FILE INTO WS-CUSTOMER-RECORD.
IF WS-CUSTOMER-ID = WS-CUSTOMER-RECORD.PROPERTY-ID
DISPLAY "Enter new Customer Name: ".
ACCEPT WS-CUSTOMER-NAME.
DISPLAY "Enter new Customer Contact: ".
ACCEPT WS-CUSTOMER-CONTACT.
REWRITE REAL_ESTATE-RECORD FROM WS-CUSTOMER-RECORD.
ELSE
DISPLAY "Customer ID not found".
END-IF.
DELETE-CUSTOMER.
DISPLAY "Enter Customer ID to delete: ".
ACCEPT WS-CUSTOMER-ID.
READ REAL_ESTATE_FILE INTO WS-CUSTOMER-RECORD.
IF WS-CUSTOMER-ID = WS-CUSTOMER-RECORD.PROPERTY-ID
DELETE REAL_ESTATE-RECORD.
ELSE
DISPLAY "Customer ID not found".
END-IF.
在这个模块中，我们定义了三个子程序：`ADD-CUSTOMER`、`MODIFY-CUSTOMER`和`DELETE-CUSTOMER`，分别用于添加、修改和删除客户信息。
交易管理模块
交易管理模块负责记录和管理房地产交易信息。以下是一个简单的交易管理模块的代码示例：
pl/i
IDENTIFICATION DIVISION.
PROGRAM-ID. TRANSACTION-MANAGEMENT.
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT REAL_ESTATE_FILE ASSIGN TO "REAL_ESTATE.DAT".
DATA DIVISION.
FILE SECTION.
FD REAL_ESTATE_FILE.
01 REAL_ESTATE-RECORD.
05 PROPERTY-ID PIC X(10).
05 PROPERTY-ADDRESS PIC X(50).
05 PROPERTY-TYPE PIC X(20).
05 PROPERTY-PRICE PIC 9(10).99.
05 PROPERTY-STATUS PIC X(10).
WORKING-STORAGE SECTION.
01 WS-TRANSACTION-RECORD.
05 WS-TRANSACTION-ID PIC X(10).
05 WS-PROPERTY-ID PIC X(10).
05 WS-TRANSACTION-TYPE PIC X(20).
05 WS-TRANSACTION-DATE PIC X(10).
PROCEDURE DIVISION.
PERFORM ADD-TRANSACTION.
PERFORM MODIFY-TRANSACTION.
PERFORM DELETE-TRANSACTION.
STOP RUN.
ADD-TRANSACTION.
DISPLAY "Enter Transaction ID: ".
ACCEPT WS-TRANSACTION-ID.
DISPLAY "Enter Property ID: ".
ACCEPT WS-PROPERTY-ID.
DISPLAY "Enter Transaction Type (Buy/Sell/Rent): ".
ACCEPT WS-TRANSACTION-TYPE.
DISPLAY "Enter Transaction Date (YYYYMMDD): ".
ACCEPT WS-TRANSACTION-DATE.
WRITE REAL_ESTATE-RECORD FROM WS-TRANSACTION-RECORD.
MODIFY-TRANSACTION.
DISPLAY "Enter Transaction ID to modify: ".
ACCEPT WS-TRANSACTION-ID.
READ REAL_ESTATE_FILE INTO WS-TRANSACTION-RECORD.
IF WS-TRANSACTION-ID = WS-TRANSACTION-RECORD.PROPERTY-ID
DISPLAY "Enter new Property ID: ".
ACCEPT WS-PROPERTY-ID.
DISPLAY "Enter new Transaction Type (Buy/Sell/Rent): ".
ACCEPT WS-TRANSACTION-TYPE.
DISPLAY "Enter new Transaction Date (YYYYMMDD): ".
ACCEPT WS-TRANSACTION-DATE.
REWRITE REAL_ESTATE-RECORD FROM WS-TRANSACTION-RECORD.
ELSE
DISPLAY "Transaction ID not found".
END-IF.
DELETE-TRANSACTION.
DISPLAY "Enter Transaction ID to delete: ".
ACCEPT WS-TRANSACTION-ID.
READ REAL_ESTATE_FILE INTO WS-TRANSACTION-RECORD.
IF WS-TRANSACTION-ID = WS-TRANSACTION-RECORD.PROPERTY-ID
DELETE REAL_ESTATE-RECORD.
ELSE
DISPLAY "Transaction ID not found".
END-IF.
在这个模块中，我们定义了三个子程序：`ADD-TRANSACTION`、`MODIFY-TRANSACTION`和`DELETE-TRANSACTION`，分别用于添加、修改和删除交易信息。
报表生成模块
报表生成模块负责生成各种报表，如房源统计、交易统计等。以下是一个简单的报表生成模块的代码示例：
pl/i
IDENTIFICATION DIVISION.
PROGRAM-ID. REPORT-GENERATION.
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT REAL_ESTATE_FILE ASSIGN TO "REAL_ESTATE.DAT".
DATA DIVISION.
FILE SECTION.
FD REAL_ESTATE_FILE.
01 REAL_ESTATE-RECORD.
05 PROPERTY-ID PIC X(10).
05 PROPERTY-ADDRESS PIC X(50).
05 PROPERTY-TYPE PIC X(20).
05 PROPERTY-PRICE PIC 9(10).99.
05 PROPERTY-STATUS PIC X(10).
WORKING-STORAGE SECTION.
01 WS-REPORT-RECORD.
05 WS-REPORT-TITLE PIC X(50).
05 WS-REPORT-DATA PIC X(100).
PROCEDURE DIVISION.
PERFORM GENERATE-PROPERTY-REPORT.
PERFORM GENERATE-TRANSACTION-REPORT.
STOP RUN.
GENERATE-PROPERTY-REPORT.
OPEN OUTPUT WS-REPORT-RECORD.
WRITE WS-REPORT-RECORD FROM "Property Report".
READ REAL_ESTATE_FILE INTO REAL_ESTATE-RECORD.
PERFORM UNTIL END-OF-FILE
WRITE WS-REPORT-RECORD FROM REAL_ESTATE-RECORD
READ REAL_ESTATE_FILE
END-PERFORM.
CLOSE WS-REPORT-RECORD.
GENERATE-TRANSACTION-REPORT.
OPEN OUTPUT WS-REPORT-RECORD.
WRITE WS-REPORT-RECORD FROM "Transaction Report".
READ REAL_ESTATE_FILE INTO REAL_ESTATE-RECORD.
PERFORM UNTIL END-OF-FILE
WRITE WS-REPORT-RECORD FROM REAL_ESTATE-RECORD
READ REAL_ESTATE_FILE
END-PERFORM.
CLOSE WS-REPORT-RECORD.
在这个模块中，我们定义了两个子程序：`GENERATE-PROPERTY-REPORT`和`GENERATE-TRANSACTION-REPORT`，分别用于生成房源报表和交易报表。
结论
本文通过PL/I语言，展示了一个虚拟房地产管理系统的基本架构和代码实现。虽然PL/I在现代编程中不再流行，但通过本文的示例，我们可以看到PL/I在处理特定领域的问题时仍然具有其独特的优势。在实际应用中，可以根据具体需求对系统进行扩展和优化。
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