Read e-book online Advances in database programing languages PDF

By Fançois Bancilhon; Peter Buneman (eds.)

ISBN-10: 0201502577

ISBN-13: 9780201502572

Show description

Read Online or Download Advances in database programing languages PDF

Similar sql books

New PDF release: SQL and Relational Theory: How to Write Accurate SQL Code

SQL is stuffed with problems and traps for the unwary. you could steer clear of them should you comprehend relational conception, yet provided that you know the way to place that concept into perform. during this publication, Chris Date explains relational idea extensive, and demonstrates via a number of examples and workouts how one can use it on your use of SQL.

Read e-book online MySQL and PHP Database Applications PDF

Extra companies and bold everyone is attempting to convey purposes to the internet yet they're bewildered with the array of parts and ideas had to create a data-driven website. the price, balance and straightforwardness of improvement utilizing the Open resource personal home page four scripting language and a MySQL database makes this mix the best option for small and mid-size Web-based functions.

New PDF release: Pro SQL Server 2005 (Pro)

SQL Server 2005 is subsequent new release of SQL Server database and represents an important step forward for SQL Server builders when it comes to programming ideas, productiveness, database administration and research. This publication will take a deep examine the entire variety of SQL Server improvements that may supply significant and proper examples that exhibit not only how those new gains paintings, but additionally how one can architect their functions to be able to take advantage of the hot positive factors so much successfully.

Access 2007 for Starters: The Missing Manual by Matthew MacDonald PDF

This fast paced e-book teaches you the fundamentals of entry 2007 so that you can commence utilizing this well known database application instantly. you are going to the way to paintings with entry' Most worthy beneficial properties to layout databases, continue them, look for invaluable nuggets of data, and construct appealing varieties for quick-and-easy info access.

Extra resources for Advances in database programing languages

Sample text

As shown in the example, the function can be called with a string literal expression or a variable as the parameter. Functions can also return values. For example, consider the following code fragment that declares and uses a function heading( ), which returns a string using the return statement: function heading($text, $headingLevel) { switch ($headingLevel) { case 1: $result = "


"; break; case 2: $result = "


"; break; case 3: $result = "


"; break; default: $result = "


"; } return($result); } $test = "User-defined Functions"; 62 63 print heading($test, 2); The function takes two parameters: the text of a heading and a heading level.

0, while the number 123 is an integer. 02 $var4 = 2e-2 You've already seen examples of strings earlier in the chapter. Here are two more example string variables: $variable = "This is a string"; $test = 'This is also a string'; Along with the value, the type of a variable can change over the lifetime of the variable. Consider an example: $var = 15; $var = "Sarah the Cat"; This fragment is acceptable in PHP. The type of $var changes from integer to string as the variable is reassigned. Letting PHP change the type of a variable as the context changes is very flexible and a little 37 38 dangerous.

The same rules are used for automatic type conversion as demonstrated previously in Table 2-1. 0; // $var is set as a string = "39 Steps" $var = 39 . " Steps"; Not all type conversions are so obvious and can be the cause of hard-to-find bugs: // $var is set as an integer = 39 $var = 39 + " Steps"; // $var is an integer = 42 $var = "3 blind mice" + 39; // $var is a float, but what does it mean? 14159; Automatic type conversion can change the type of a variable. 5 $var *= 2; // $var is still a float == 3 55 56 Care must be taken when interpreting non-Boolean values as Boolean.

Download PDF sample

Advances in database programing languages by Fançois Bancilhon; Peter Buneman (eds.)

by Edward

Rated 4.13 of 5 – based on 43 votes