Foxpro Commands With Example Pdf Free Downloadl __TOP__
Foxpro Commands With Example Pdf Free Downloadl
Foxpro is a powerful and versatile programming language that can be used to create database applications, reports, forms, menus, and more. Foxpro commands are the instructions that you use to manipulate data, control the flow of your program, and interact with the user. In this article, you will learn some of the basic Foxpro commands with examples and how to download a free PDF guide that covers them in detail.
Foxpro Commands With Example Pdf Free Downloadl
What are Foxpro Commands?
Foxpro commands are divided into two categories: command mode commands and executable mode commands. Command mode commands are entered directly at the command window or the dot prompt and are executed immediately. Executable mode commands are written in a program file or a procedure and are executed when you run the program or call the procedure. Some commands can be used in both modes, while others are specific to one mode.
Command Mode Commands
Command mode commands are useful for performing quick tasks, testing your code, or exploring your data. Some of the common command mode commands are:
USE: Opens a table and its associated index files or opens a SQL view. For example, USE products opens the products table and its indexes.
BROWSE: Displays records in a table, allows you to edit those records, and append additional records. For example, BROWSE FOR price > 100 displays only the records with a price greater than 100.
COPY TO: Creates a new file from the contents of the currently selected table. For example, COPY TO backup.dbf creates a backup copy of the current table.
DELETE: Marks records for deletion. For example, DELETE FOR status = "Inactive" marks all the records with an inactive status for deletion.
REPLACE: Replaces data in a field with the value in an expression. For example, REPLACE name WITH UPPER(name) converts all the names to uppercase.
COUNT: Counts the number of records that meet a condition. For example, COUNT TO n FOR category = "Books" stores the number of records with a category of books in the variable n.
SORT TO: Sorts data from a table by one or more fields and creates a new table. For example, SORT TO sorted ON name DESCENDING sorts the data by name in descending order and creates a new table called sorted.
AVERAGE: Calculates the average value of a field or an expression. For example, AVERAGE price TO avg calculates the average price and stores it in the variable avg.
DIMENSION: Declares an array and sets its dimensions. For example, DIMENSION names[10] declares an array called names with 10 elements.
DIR DIRECTORY: Displays a list of files in the current directory or a specified directory. For example, DIRECTORY *.dbf displays all the files with a .dbf extension.
EJECT PAGE: Ejects a page from the printer. For example, EJECT PAGE ejects the current page.
QUIT: Ends the current Visual FoxPro session and returns control to the operating system. For example, QUIT exits Visual FoxPro.
Executable Mode Commands
Executable mode commands are used to create programs that can perform complex tasks, handle errors, and provide user interfaces. Some of the common executable mode commands are:
DO CASE ... ENDCASE: Executes one of several groups of statements based on a condition. For example,
DO CASE
CASE age < 18
MESSAGEBOX("You are underage.")
CASE age >= 18 AND age < 65
MESSAGEBOX("You are eligible.")
OTHERWISE
MESSAGEBOX("You are retired.")
ENDCASE
DO WHILE ... ENDDO: Executes a group of statements repeatedly while a condition is true. For example,
n = 1
DO WHILE n <= 10
? n
n = n + 1
ENDDO
FOR ... ENDFOR: Executes a group of statements for each value in a range or an array. For example,
FOR i = 1 TO 10 STEP 2
? i
ENDFOR
IF ... ELSE ... ENDIF: Executes one group of statements if a condition is true and another group if it is false. For example,
IF score >= 50
? "Pass"
ELSE
? "Fail"
ENDIF
How to Download a Free PDF Guide for Foxpro Commands with Examples
If you want to learn more about Foxpro commands with examples, you can download a free PDF guide from the following link: Basic FoxPro commands. This guide covers some of the basic Foxpro command mode commands, such as browse, copy to, delete, replace, select, use, zap, and more. It also provides some tips and tricks for working with Foxpro tables and data.
How to Create a Program with Foxpro Commands
To create a program with Foxpro commands, you need to use a text editor or the program editor in Visual FoxPro. You can write executable mode commands in a program file and save it with a .prg extension. You can also create procedures within a program file or in a separate procedure file with a .prg extension. Procedures are reusable blocks of code that can be called from other programs or procedures. To run a program or a procedure, you can use the DO command followed by the name of the program or procedure. For example,
* This is a program file called hello.prg
* It contains a procedure called greet
PROCEDURE greet
? "Hello, world!"
RETURN
* To run this procedure, type DO greet
How to Use Foxpro Commands with SQL
Foxpro commands can also be used with SQL (Structured Query Language), which is a standard language for accessing and manipulating data in relational databases. SQL allows you to perform tasks such as creating tables, inserting data, updating data, deleting data, querying data, joining tables, and more. To use SQL commands in Foxpro, you need to use the SQL prefix before the command. For example,
* This SQL command creates a table called customers with four fields
SQL CREATE TABLE customers (id INT, name CHAR(20), email CHAR(30), phone CHAR(10))
* This SQL command inserts a record into the customers table
SQL INSERT INTO customers VALUES (1, "John Smith", "john@email.com", "1234567890")
* This SQL command selects all records from the customers table
SQL SELECT * FROM customers
You can also use SQL views to create virtual tables based on queries. SQL views can be used like regular tables in Foxpro commands. To create a SQL view, you need to use the CREATE SQL VIEW command followed by the name of the view and the query. For example,
* This command creates a SQL view called books_view that selects all books with a price less than 50
CREATE SQL VIEW books_view AS SELECT * FROM books WHERE price < 50
* This command browses the records in the books_view
USE books_view
BROWSE
How to Use Foxpro Commands with Arrays
Arrays are data structures that can store multiple values of the same data type in a single variable. Foxpro commands can be used to create, manipulate, and access arrays. Some of the common commands and functions for working with arrays are:
DIMENSION: Declares an array and sets its dimensions. For example, DIMENSION names[10] declares an array called names with 10 elements.
STORE: Stores a value or an expression in an array element. For example, STORE "John" TO names[1] stores the string "John" in the first element of the names array.
ADEL: Deletes an element from an array. For example, ADEL(names, 5) deletes the fifth element of the names array.
ACOPY: Copies elements from one array to another. For example, ACOPY(names, copy) copies all the elements of the names array to a new array called copy.
ALEN: Returns the number of elements in an array. For example, ? ALEN(names) displays the number of elements in the names array.
ASORT: Sorts the elements of an array in ascending or descending order. For example, ASORT(names) sorts the names array in ascending order.
AVERAGE: Calculates the average value of an array or an expression. For example, AVERAGE(scores) calculates the average value of the scores array.
COUNT: Counts the number of elements in an array that meet a condition. For example, COUNT TO n FOR names = "John" counts the number of elements in the names array that are equal to "John" and stores it in the variable n.
SUM: Calculates the sum of an array or an expression. For example, SUM(scores) calculates the sum of the scores array.
How to Use Foxpro Commands with Forms and Reports
Foxpro commands can also be used to create and modify forms and reports. Forms are graphical user interfaces that allow you to display and edit data, while reports are formatted documents that allow you to print data. Some of the common commands for working with forms and reports are:
CREATE FORM: Creates a new form or opens an existing form in the Form Designer. For example, CREATE FORM customer creates a new form called customer.
MODIFY FORM: Modifies an existing form in the Form Designer. For example, MODIFY FORM customer modifies the customer form.
RUN DO FORM: Runs a form or a program that contains a form. For example, RUN customer.prg runs a program that contains a customer form.
CREATE REPORT: Creates a new report or opens an existing report in the Report Designer. For example, CREATE REPORT sales creates a new report called sales.
MODIFY REPORT: Modifies an existing report in the Report Designer. For example, MODIFY REPORT sales modifies the sales report.
REPORT FORM LABEL FORM: Prints a report or a label based on a table or a query. For example, REPORT FORM sales TO PRINTER PREVIEW prints a preview of the sales report based on the current table or query.
CANCEL QUIT SUSPEND RESUME END RETURN EXIT ON SHUTDOWN ON KEY LABEL ON ESCAPE ON SELECTION ON PAD ON BAR ON READERROR ON ERROR ON KEYBOARD ON MOUSEMOVE ON MOUSEUP ON MOUSEDOWN : These commands control how forms and reports respond to user actions and events. For example, CANCEL ALL cancels all forms and reports that are currently running.
Conclusion
Foxpro commands are a powerful and versatile way to create database applications, manipulate data, and interact with the user. In this article, you have learned some of the basic Foxpro commands with examples and how to download a free PDF guide that covers them in detail. You have also learned how to use Foxpro commands with SQL, arrays, forms, and reports. With Foxpro commands, you can create professional and efficient database solutions for your business or personal needs. d282676c82
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