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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>$this->db->last_query()</strong></p> |
| <p>Returns the last query that was run (the query string, not the result). |
| Example:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">last_query</span><span class="p">();</span> |
| |
| <span class="c1">// Produces: SELECT * FROM sometable....</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Disabling the <strong>save_queries</strong> setting in your database |
| configuration will render this function useless.</p> |
| </div> |
| </div> |
| <div class="section" id="information-about-your-database"> |
| <h2>Information About Your Database<a class="headerlink" href="#information-about-your-database" title="Permalink to this headline">¶</a></h2> |
| <p><strong>$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></span><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></span><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></span><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></span><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">$data</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>The first parameter is the table name, the second is an associative |
| array with the data to be inserted. The above example produces:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">INSERT</span> <span class="nx">INTO</span> <span class="nx">table_name</span> <span class="p">(</span><span class="nx">name</span><span class="p">,</span> <span class="nx">email</span><span class="p">,</span> <span class="nx">url</span><span class="p">)</span> <span class="nx">VALUES</span> <span class="p">(</span><span class="s1">'Rick'</span><span class="p">,</span> <span class="s1">'rick@example.com'</span><span class="p">,</span> <span class="s1">'example.com'</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Values are automatically escaped, producing safer queries.</p> |
| </div> |
| <p><strong>$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></span><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></span><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> |
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