Updating airline technology needed problems


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Both provide abstraction from the choice of a particular database.

Therefore, your code can run without too much adjustment on IBM® DB2®, My SQL, Postgre SQL, or any other database you want to connect to.

The other value in using the abstraction layers of the PEAR DB module and PDO is that you can use the DROP TABLE IF EXISTS users; CREATE TABLE users ( id MEDIUMINT, login TEXT, password TEXT ); INSERT INTO users VALUES ( 1, 'jack', 'pass' ); INSERT INTO users VALUES ( 2, 'joan', 'pass' ); INSERT INTO users VALUES ( 1, 'jane', 'pass' ); value plus one. Use the auto-increment feature in My SQL to create unique IDs for each insertion automatically. DROP TABLE IF EXISTS users; CREATE TABLE users ( id MEDIUMINT NOT NULL AUTO_INCREMENT, login TEXT NOT NULL, password TEXT NOT NULL, PRIMARY KEY( id ) ); INSERT INTO users VALUES ( null, 'jack', 'pass' ); INSERT INTO users VALUES ( null, 'joan', 'pass' ); INSERT INTO users VALUES ( null, 'jane', 'pass' ); method in the PEAR DB system.

This code could fail in race conditions on servers with a heavy load. In the case of My SQL, this creates a new sequence table and manages that using an elaborate locking mechanism.

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I can't tell you how many times we've seen large applications in which the code first retrieves a list of entities -- say, customers -- then comes back and retrieves them one by one to get the details for each entity. Look at how many queries we had to perform to retrieve only the books by Jack Herrington.Databases are powerful tools, and -- like all powerful tools -- they can be abused if you don't know how to use them properly.



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