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| <div class="section" id="database-metadata"> |
| <h1>Database Metadata<a class="headerlink" href="#database-metadata" title="Permalink to this headline">¶</a></h1> |
| <div class="section" id="table-metadata"> |
| <h2>Table MetaData<a class="headerlink" href="#table-metadata" title="Permalink to this headline">¶</a></h2> |
| <p>These functions let you fetch table information.</p> |
| <div class="section" id="list-the-tables-in-your-database"> |
| <h3>List the Tables in Your Database<a class="headerlink" href="#list-the-tables-in-your-database" title="Permalink to this headline">¶</a></h3> |
| <p><strong>$this->db->list_tables();</strong></p> |
| <p>Returns an array containing the names of all the tables in the database |
| you are currently connected to. Example:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$tables</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">list_tables</span><span class="p">();</span> |
| |
| <span class="k">foreach</span> <span class="p">(</span><span class="nv">$tables</span> <span class="k">as</span> <span class="nv">$table</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="k">echo</span> <span class="nv">$table</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="determine-if-a-table-exists"> |
| <h3>Determine If a Table Exists<a class="headerlink" href="#determine-if-a-table-exists" title="Permalink to this headline">¶</a></h3> |
| <p><strong>$this->db->table_exists();</strong></p> |
| <p>Sometimes it’s helpful to know whether a particular table exists before |
| running an operation on it. Returns a boolean TRUE/FALSE. Usage example:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">table_exists</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">))</span> |
| <span class="p">{</span> |
| <span class="c1">// some code...</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Replace <em>table_name</em> with the name of the table you are looking for.</p> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="field-metadata"> |
| <h2>Field MetaData<a class="headerlink" href="#field-metadata" title="Permalink to this headline">¶</a></h2> |
| <div class="section" id="list-the-fields-in-a-table"> |
| <h3>List the Fields in a Table<a class="headerlink" href="#list-the-fields-in-a-table" title="Permalink to this headline">¶</a></h3> |
| <p><strong>$this->db->list_fields()</strong></p> |
| <p>Returns an array containing the field names. This query can be called |
| two ways:</p> |
| <p>1. You can supply the table name and call it from the $this->db-> |
| object:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">list_fields</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span> |
| |
| <span class="k">foreach</span> <span class="p">(</span><span class="nv">$fields</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="k">echo</span> <span class="nv">$field</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>2. You can gather the field names associated with any query you run by |
| calling the function from your query result object:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'SELECT * FROM some_table'</span><span class="p">);</span> |
| |
| <span class="k">foreach</span> <span class="p">(</span><span class="nv">$query</span><span class="o">-></span><span class="na">list_fields</span><span class="p">()</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="k">echo</span> <span class="nv">$field</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="determine-if-a-field-is-present-in-a-table"> |
| <h3>Determine If a Field is Present in a Table<a class="headerlink" href="#determine-if-a-field-is-present-in-a-table" title="Permalink to this headline">¶</a></h3> |
| <p><strong>$this->db->field_exists()</strong></p> |
| <p>Sometimes it’s helpful to know whether a particular field exists before |
| performing an action. Returns a boolean TRUE/FALSE. Usage example:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">field_exists</span><span class="p">(</span><span class="s1">'field_name'</span><span class="p">,</span> <span class="s1">'table_name'</span><span class="p">))</span> |
| <span class="p">{</span> |
| <span class="c1">// some code...</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Replace <em>field_name</em> with the name of the column you are looking |
| for, and replace <em>table_name</em> with the name of the table you are |
| looking for.</p> |
| </div> |
| </div> |
| <div class="section" id="retrieve-field-metadata"> |
| <h3>Retrieve Field Metadata<a class="headerlink" href="#retrieve-field-metadata" title="Permalink to this headline">¶</a></h3> |
| <p><strong>$this->db->field_data()</strong></p> |
| <p>Returns an array of objects containing field information.</p> |
| <p>Sometimes it’s helpful to gather the field names or other metadata, like |
| the column type, max length, etc.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Not all databases provide meta-data.</p> |
| </div> |
| <p>Usage example:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">field_data</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span> |
| |
| <span class="k">foreach</span> <span class="p">(</span><span class="nv">$fields</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="k">echo</span> <span class="nv">$field</span><span class="o">-></span><span class="na">name</span><span class="p">;</span> |
| <span class="k">echo</span> <span class="nv">$field</span><span class="o">-></span><span class="na">type</span><span class="p">;</span> |
| <span class="k">echo</span> <span class="nv">$field</span><span class="o">-></span><span class="na">max_length</span><span class="p">;</span> |
| <span class="k">echo</span> <span class="nv">$field</span><span class="o">-></span><span class="na">primary_key</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>If you have run a query already you can use the result object instead of |
| supplying the table name:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s2">"YOUR QUERY"</span><span class="p">);</span> |
| <span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$query</span><span class="o">-></span><span class="na">field_data</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| <p>The following data is available from this function if supported by your |
| database:</p> |
| <ul class="simple"> |
| <li>name - column name</li> |
| <li>max_length - maximum length of the column</li> |
| <li>primary_key - 1 if the column is a primary key</li> |
| <li>type - the type of the column</li> |
| </ul> |
| </div> |
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