Файл: CodeIgniter-3.0.3/user_guide/database/helpers.html
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<div class="section" id="query-helper-methods">
<h1>Query Helper Methods<a class="headerlink" href="#query-helper-methods" title="Permalink to this headline">¶</a></h1>
<div class="section" id="information-from-executing-a-query">
<h2>Information From Executing a Query<a class="headerlink" href="#information-from-executing-a-query" title="Permalink to this headline">¶</a></h2>
<p><strong>$this->db->insert_id()</strong></p>
<p>The insert ID number when performing database inserts.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If using the PDO driver with PostgreSQL, or using the Interbase
driver, this function requires a $name parameter, which specifies the
appropriate sequence to check for the insert id.</p>
</div>
<p><strong>$this->db->affected_rows()</strong></p>
<p>Displays the number of affected rows, when doing “write” type queries
(insert, update, etc.).</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">In MySQL “DELETE FROM TABLE” returns 0 affected rows. The database
class has a small hack that allows it to return the correct number of
affected rows. By default this hack is enabled but it can be turned off
in the database driver file.</p>
</div>
<p><strong>$this->db->last_query()</strong></p>
<p>Returns the last query that was run (the query string, not the result).
Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">last_query</span><span class="p">();</span>
<span class="c1">// Produces: SELECT * FROM sometable....</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Disabling the <strong>save_queries</strong> setting in your database
configuration will render this function useless.</p>
</div>
</div>
<div class="section" id="information-about-your-database">
<h2>Information About Your Database<a class="headerlink" href="#information-about-your-database" title="Permalink to this headline">¶</a></h2>
<p><strong>$this->db->count_all()</strong></p>
<p>Permits you to determine the number of rows in a particular table.
Submit the table name in the first parameter. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">count_all</span><span class="p">(</span><span class="s1">'my_table'</span><span class="p">);</span>
<span class="c1">// Produces an integer, like 25</span>
</pre></div>
</div>
<p><strong>$this->db->platform()</strong></p>
<p>Outputs the database platform you are running (MySQL, MS SQL, Postgres,
etc...):</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">platform</span><span class="p">();</span>
</pre></div>
</div>
<p><strong>$this->db->version()</strong></p>
<p>Outputs the database version you are running:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">version</span><span class="p">();</span>
</pre></div>
</div>
</div>
<div class="section" id="making-your-queries-easier">
<h2>Making Your Queries Easier<a class="headerlink" href="#making-your-queries-easier" title="Permalink to this headline">¶</a></h2>
<p><strong>$this->db->insert_string()</strong></p>
<p>This function simplifies the process of writing database inserts. It
returns a correctly formatted SQL insert string. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'name'</span> <span class="o">=></span> <span class="nv">$name</span><span class="p">,</span> <span class="s1">'email'</span> <span class="o">=></span> <span class="nv">$email</span><span class="p">,</span> <span class="s1">'url'</span> <span class="o">=></span> <span class="nv">$url</span><span class="p">);</span>
<span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">insert_string</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
</pre></div>
</div>
<p>The first parameter is the table name, the second is an associative
array with the data to be inserted. The above example produces:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nx">INSERT</span> <span class="nx">INTO</span> <span class="nx">table_name</span> <span class="p">(</span><span class="nx">name</span><span class="p">,</span> <span class="nx">email</span><span class="p">,</span> <span class="nx">url</span><span class="p">)</span> <span class="nx">VALUES</span> <span class="p">(</span><span class="s1">'Rick'</span><span class="p">,</span> <span class="s1">'rick@example.com'</span><span class="p">,</span> <span class="s1">'example.com'</span><span class="p">)</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Values are automatically escaped, producing safer queries.</p>
</div>
<p><strong>$this->db->update_string()</strong></p>
<p>This function simplifies the process of writing database updates. It
returns a correctly formatted SQL update string. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'name'</span> <span class="o">=></span> <span class="nv">$name</span><span class="p">,</span> <span class="s1">'email'</span> <span class="o">=></span> <span class="nv">$email</span><span class="p">,</span> <span class="s1">'url'</span> <span class="o">=></span> <span class="nv">$url</span><span class="p">);</span>
<span class="nv">$where</span> <span class="o">=</span> <span class="s2">"author_id = 1 AND status = 'active'"</span><span class="p">;</span>
<span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">update_string</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">,</span> <span class="nv">$where</span><span class="p">);</span>
</pre></div>
</div>
<p>The first parameter is the table name, the second is an associative
array with the data to be updated, and the third parameter is the
“where” clause. The above example produces:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nx">UPDATE</span> <span class="nx">table_name</span> <span class="nx">SET</span> <span class="nx">name</span> <span class="o">=</span> <span class="s1">'Rick'</span><span class="p">,</span> <span class="nx">email</span> <span class="o">=</span> <span class="s1">'rick@example.com'</span><span class="p">,</span> <span class="nx">url</span> <span class="o">=</span> <span class="s1">'example.com'</span> <span class="nx">WHERE</span> <span class="nx">author_id</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">AND</span> <span class="nx">status</span> <span class="o">=</span> <span class="s1">'active'</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Values are automatically escaped, producing safer queries.</p>
</div>
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