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automatic joint in QBE example

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Marc Delisle
2002-04-26 13:55:23 +00:00
parent 5e6b69d350
commit 5a76d663a0
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ChangeLog
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@@ -9,6 +9,7 @@ $Source$
* tbl_qbe.php3: automatic joints from Relation table, thanks
to Mike Beck (mike.beck at ibmiller.de)
(experimental: some things remain to be tested)
* Documentation.html: example for automatic joints
2002-04-26 Alexander M. Turek <rabus@users.sourceforge.net>
* libraries/common.lib.php3: fixed a controluser bug.

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Documentation.html
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@@ -593,6 +593,10 @@ $cfg['PmaAbsoluteUri'] = (!empty($HTTPS) ? 'https' : 'http') . '://'
display links on the table properties page, to check referential
integrity (display missing foreign keys) for each described key.
</li>
<li>
in query-by-example, create automatic joints (see an example
in the FAQ, section &quot;Using phpMyAdmin&quot;).
</li>
</ul>
<br />
@@ -1533,6 +1537,68 @@ $cfg['PmaAbsoluteUri'] = (!empty($HTTPS) ? 'https' : 'http') . '://'
this document.
</p>
<p>
<b>How can I use the relation table in Query-by-example?</b>
<br />
Here is an example with the tables persons, towns and countries. Start
by creating this: <br /><br />
<tt>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CREATE TABLE countries (<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;country_code char(1) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;description varchar(10) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PRIMARY KEY (country_code)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;) TYPE=MyISAM;<br />
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;INSERT INTO countries VALUES ('C', 'Canada');<br />
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CREATE TABLE persons (<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;id tinyint(4) NOT NULL auto_increment,<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;person_name varchar(32) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;town_code varchar(5) default '0',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;country_code char(1) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PRIMARY KEY (id)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;) TYPE=MyISAM;<br />
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;INSERT INTO persons VALUES (11, 'Marc', 'S', '');<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;INSERT INTO persons VALUES (15, 'Paul', 'S', 'C');<br />
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CREATE TABLE relation (<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;src_table varchar(32) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;src_column varchar(32) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dest_table varchar(32) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dest_column varchar(32) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PRIMARY KEY (src_table,src_column)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;) TYPE=MyISAM;<br />
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;INSERT INTO relation VALUES ('persons', 'town_code', 'towns', 'town_code');<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;INSERT INTO relation VALUES ('persons', 'country_code', 'countries', 'country_code');<br />
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CREATE TABLE towns (<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;town_code varchar(5) NOT NULL default '0',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;description varchar(30) NOT NULL default '',<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PRIMARY KEY (town_code)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;) TYPE=MyISAM;<br />
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;INSERT INTO towns VALUES ('S', 'Sherbrooke');<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;INSERT INTO towns VALUES ('M', 'Montr<74>al');<br />
</tt>
<br />
Then test like this:
<ul>
<li>Click on your db name in the left frame</li>
<li>Choose &quot;Query by example&quot;</li>
<li>Use tables: persons, towns, countries</li>
<li>Click &quot;Update query&quot;</li>
<li>In the fields row, choose persons.person_name and click the
&quot;Show&quot; tickbox </li>
<li>Do the same for towns.description and countries.descriptions in
the other 2 columns</li>
<li>Click &quot;Update query&quot; and you will see in the query box
that the correct joints have been generated</li>
<li>Click &quot;Submit query&quot;</li>
</ul>
</p>
<a name="faqproject"></a>
<h3>[phpMyAdmin project]</h3>
<p>