VFP Database Programming Tutorial47

Visual FoxPro (VFP) is a powerful database programming language that is ideal for creating custom business applications. In this tutorial, you will learn the basics of VFP database programming, including how to create a database, create tables, add data to tables, and query data from tables.

Prerequisites

Before you can begin this tutorial, you will need the following:
A copy of Visual FoxPro
A database
A table
Data to add to the table

Creating a Database

The first step in creating a VFP database is to create a database container. A database container is a file that stores the database's tables, indexes, and other objects. To create a database container, use the following syntax:```vfp
CREATE DATABASE
```

For example, to create a database container named "MyDatabase", you would use the following syntax:```vfp
CREATE DATABASE MyDatabase
```

Creating Tables

Once you have created a database container, you can begin creating tables. A table is a collection of related data. To create a table, use the following syntax:```vfp
CREATE TABLE (
,
,
...
)
```

For example, to create a table named "Customers" with the following columns:
Customer ID (integer)
Customer Name (string)
Customer Address (string)
Customer City (string)
Customer State (string)
Customer Zip Code (string)

You would use the following syntax:```vfp
CREATE TABLE Customers (
Customer_ID INTEGER,
Customer_Name STRING,
Customer_Address STRING,
Customer_City STRING,
Customer_State STRING,
Customer_Zip_Code STRING
)
```

Adding Data to Tables

Once you have created a table, you can begin adding data to it. To add data to a table, use the following syntax:```vfp
INSERT INTO (, , ...)
VALUES (, , ...)
```

For example, to add the following data to the "Customers" table:
Customer ID: 1
Customer Name: John Doe
Customer Address: 123 Main Street
Customer City: Anytown
Customer State: CA
Customer Zip Code: 12345

You would use the following syntax:```vfp
INSERT INTO Customers (Customer_ID, Customer_Name, Customer_Address, Customer_City, Customer_State, Customer_Zip_Code)
VALUES (1, 'John Doe', '123 Main Street', 'Anytown', 'CA', '12345')
```

Querying Data from Tables

Once you have added data to a table, you can begin querying it. To query data from a table, use the following syntax:```vfp
SELECT , , ...
FROM
WHERE
```

For example, to select all of the customer names from the "Customers" table, you would use the following syntax:```vfp
SELECT Customer_Name
FROM Customers
```

To select all of the customer names from the "Customers" table where the customer state is "CA", you would use the following syntax:```vfp
SELECT Customer_Name
FROM Customers
WHERE Customer_State = 'CA'
```

Conclusion

This tutorial has provided you with the basics of VFP database programming. For more information, please refer to the VFP documentation.

2025-01-13

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