1. Database Connections

2. Databases
The simplest databases can be as simple as MS Access or MS Excel
Use them for small sites
Large sites may require large industrial-strength databases.
ORACLE is the 2nd largest software company in the world – all based on Databases

3. Database Terms: TABLE
A database consists of many TABLES. A table is analogous to a spreadsheet.
For an e-commerce Web site database this may consist of tables such as CUSTOMERS, PRODUCTS, ORDERS, etc.

4. Database Terms: Record
A record is a “row” of data. It all pertains to the same entity.
EXAMPLE: A customer’s name and address.

5. Database Terms: Field A field is a “column” of data.
EXAMPLE: FirstName

6. Database Terms: Primary Key
The PRIMARY KEY is the column in the database that is unique for each and every row.
Even something as basic and individual as an SSN may not be a good unique identifier. What if someone changes it to protect their identity, or the number is recycled, or they are not US citizens or residents.

7. Databases
Web Databases – CSC 122 Teaches more about Databases

8. Making Database Queries
SQL
Making Database Queries

9. SQL
“S-Q-L”, or “Sequel” is the most common language to access databases.
It comes in many dialects, but the most basic operations require only simple SQL statements.
You program the SQL queries into your scripts.

10. SQL Example 1 - Inserting
INSERT INTO Customers (FirstName, LastName) VALUES (“Fred”, “Jones”)

11. SQL Example 2 -- Updating
UPDATE Customers SET FirstName = “Freddy” WHERE CustID = 7

12. SQL Example -- Selecting
SELECT FirstName, LastName FROM Customers WHERE LastName = Jones
Use this statement to create a RECORDSET
A RECORDSET is a subset of the database that has been copied onto the server for immediate use.

13. Recordset
Even if the record included more than just the first name and last name, the recordset only has those columns.
Freddy Jones
Suzie Jones
Marky Mark Jones
Joanie Jones

14. SQL SELECT When choosing a recordset * A wildcard
FROM From what table?
WHERE Conditions
UPDATE To update an existing record
INSERT To add a record
INTO Into what table
VALUES What values
SET SET Rank = “Sergeant”

15. SQL Operators SQL Operators are conventional. Here are some: = >
<
<>
<=
>=

16. Open Database Connectivity
ODBC

17. How do we get data from a database to a web page?
5 layers
1 Scripts – ASP, PHP
4 Driver Layer
5 Database

18. 5 layers 5 layers 1 Scripts – ASP, PHP
2 ADO (Active Data Objects Layer)
3 OLE DB Layer
4 Driver Layer
5 Database

19. Important to remember ODBC is our connection
Open Data Base Connectivity
Establish Database connections through the ODBC Control Panel Applet