bzr branch
http://gegoxaren.bato24.eu/bzr/lenasys/trunk
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20.1.1
by galaxyAbstractor
* Added an simple admin panel to the codeviewer-cmssy stuff |
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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td> |
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<a href="../index.html">User Guide Home</a> › |
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<a href="index.html">Database Library</a> › |
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Queries |
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<div id="content"> |
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<h1>Queries</h1> |
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<h2>$this->db->query();</h2> |
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<p>To submit a query, use the following function:</p> |
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<code>$this->db->query('YOUR QUERY HERE');</code> |
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<p>The <dfn>query()</dfn> function returns a database result <strong>object</strong> when "read" type queries are run, |
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which you can use to <a href="results.html">show your results</a>. When "write" type queries are run it simply returns TRUE or FALSE |
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depending on success or failure. When retrieving data you will typically assign the query to your own variable, like this:</p> |
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<code><var>$query</var> = $this->db->query('YOUR QUERY HERE');</code> |
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<h2>$this->db->simple_query();</h2> |
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<p>This is a simplified version of the <dfn>$this->db->query()</dfn> function. It ONLY returns TRUE/FALSE on success or failure. |
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It DOES NOT return a database result set, nor does it set the query timer, or compile bind data, or store your query for debugging. |
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It simply lets you submit a query. Most users will rarely use this function.</p> |
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<h1>Working with Database prefixes manually</h1> |
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<p>If you have configured a database prefix and would like to prepend it to a table name for use in a native SQL query for example, then you can use the following:</p> |
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<p><code>$this->db->dbprefix('tablename');<br /> |
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// outputs prefix_tablename</code></p> |
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<p>If for any reason you would like to change the prefix programatically without needing to create a new connection, you can use this method:</p> |
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<p><code>$this->db->set_dbprefix('newprefix');<br /><br /> |
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$this->db->dbprefix('tablename');<br /> |
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// outputs newprefix_tablename</code></p> |
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<h1>Protecting identifiers</h1> |
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<p>In many databases it is advisable to protect table and field names - for example with backticks in MySQL. <strong>Active Record queries are automatically protected</strong>, however if you need to manually protect an identifier you can use:</p> |
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<p><code>$this->db->protect_identifiers('table_name');</code></p> |
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<p>This function will also add a table prefix to your table, assuming you have a prefix specified in your database config file. To enable the prefixing set <kbd>TRUE</kbd> (boolen) via the second parameter:</p> |
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<p><code>$this->db->protect_identifiers('table_name', <kbd>TRUE</kbd>);</code></p> |
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<h1>Escaping Queries</h1> |
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<p>It's a very good security practice to escape your data before submitting it into your database. |
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CodeIgniter has three methods that help you do this:</p> |
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<ol> |
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<li><strong>$this->db->escape()</strong> This function determines the data type so that it |
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can escape only string data. It also automatically adds single quotes around the data so you don't have to: |
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<code>$sql = "INSERT INTO table (title) VALUES(".$this->db->escape($title).")";</code></li> |
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<li><strong>$this->db->escape_str()</strong> This function escapes the data passed to it, regardless of type. |
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Most of the time you'll use the above function rather than this one. Use the function like this: |
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<code>$sql = "INSERT INTO table (title) VALUES('".$this->db->escape_str($title)."')";</code></li> |
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<li><strong>$this->db->escape_like_str()</strong> This method should be used when strings are to be used in LIKE |
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conditions so that LIKE wildcards ('%', '_') in the string are also properly escaped.
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<code>$search = '20% raise';<br /> |
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$sql = "SELECT id FROM table WHERE column LIKE '%".$this->db->escape_like_str($search)."%'";</code></li> |
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</ol> |
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<h1>Query Bindings</h1> |
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<p>Bindings enable you to simplify your query syntax by letting the system put the queries together for you. Consider the following example:</p> |
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<code> |
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$sql = "SELECT * FROM some_table WHERE id = <var>?</var> AND status = <var>?</var> AND author = <var>?</var>"; |
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<br /><br /> |
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$this->db->query($sql, array(3, 'live', 'Rick')); |
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</code> |
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<p>The question marks in the query are automatically replaced with the values in the array in the second parameter of the query function.</p> |
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<p class="important">The secondary benefit of using binds is that the values are automatically escaped, producing safer queries. You don't have to remember to manually escape data; the engine does it automatically for you.</p> |
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