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In this lesson, we're going to do some more complicated work to show the data in multiple rows, the database exchanging data one, the while loop in this lesson, we will continue to drill down and use PHP and MySQL to write some simple and useful pages. We start with the database we created yesterday and display the data in the library, but we'll touch it a little bit. First, we use the following code to query the contents of the database. <html> <body> <?php $db = Mys ...
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Java Iterator is an interface that provides only the basic rules for iteration, and a foreach loop can be used for any container that implements the Iterable interface.
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Iterator and iterable objects in Java. Let's take a look at the difference between these two objects and how to implement the for each loop in a custom class.
Java Iterable interface and the Iterator interface. The class that implements the Iterable interface is iterable; the class that implements the Iterator interface is an iterator.
It would be faster to enclose the string in single quotes instead of double quotes. Because PHP searches for variables in double-quoted strings, single quotes do not. Note that only echo can do this: it's a "function" that takes multiple strings as arguments, Echo is a language structure, not a real function, so the function with double quotes). 1, if you can define the class method as static, as far as the definition of static, it will speed up nearly 4 times. 2, $ row ['id'] speed ...
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