Channels ▼

JVM Languages

How Can I Speed Up My JDBC-Based Programs?

Source Code Accompanies This Article. Download It Now.

Dec01: Java Q&A

SELECT user_id FROM user_table WHERE user_name='bob';
SELECT cart_item, product_id FROM shopping_cart WHERE user_id=77;
SELECT product_name FROM products WHERE product_id=231;
SELECT product_name FROM products WHERE product_id=527;
SELECT product_name FROM products WHERE product_id=1099;

SELECT u.user_id, c.cart_item, p.product_id, p.product_name
     FROM user_table as u, shopping_cart as c, products as p
     WHERE u.user_name='bob'
        AND u.user_id=c.user_id
        AND c.product_id=p.product_id;

Example 2: Two different ways to get the same data. (a) With a lot of little queries; (b) with a single, more complex query.

Related Reading

More Insights

Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.