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| <td><h1>Code Igniter User Guide Version 1.4.0</h1></td> | |
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| Query Results | |
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| <h1>Query Results</h1> | |
| <p>There are several ways to generate query results:</p> | |
| <h2>result()</h2> | |
| <p>This function returns the query result as an array of <strong>objects</strong>, or <strong>FALSE</strong> on failure. | |
| Typically you'll use this in a foreach loop, like this:</p> | |
| <code> | |
| $query = $this->db->query("YOUR QUERY");<br /> | |
| <br /> | |
| foreach ($query->result() as $row)<br /> | |
| {<br /> | |
| echo $row->title;<br /> | |
| echo $row->name;<br /> | |
| echo $row->body;<br /> | |
| }</code> | |
| <p>If you run queries that might <strong>not</strong> produce a result, you are encouraged to test the result first:</p> | |
| <code> | |
| $query = $this->db->query("YOUR QUERY");<br /> | |
| <br /> | |
| if ($query->num_rows() > 0)<br /> | |
| {<br /> | |
| foreach ($query->result() as $row)<br /> | |
| {<br /> | |
| echo $row->title;<br /> | |
| echo $row->name;<br /> | |
| echo $row->body;<br /> | |
| }<br /> | |
| } | |
| </code> | |
| <h2>result_array()</h2> | |
| <p>This function returns the query result as a pure array, or FALSE on failure. Typically you'll use this in a foreach loop, like this:</p> | |
| <code> | |
| $query = $this->db->query("YOUR QUERY");<br /> | |
| <br /> | |
| foreach ($query->result_array() as $row)<br /> | |
| {<br /> | |
| echo $row['title'];<br /> | |
| echo $row['name'];<br /> | |
| echo $row['body'];<br /> | |
| }</code> | |
| <h2>row()</h2> | |
| <p>This function returns a single result row. If your query has more than one row, it returns only the first row. | |
| The result is returned as an <strong>object</strong>. Here's a usage example:</p> | |
| <code> | |
| $query = $this->db->query("YOUR QUERY");<br /> | |
| <br /> | |
| if ($query->num_rows() > 0)<br /> | |
| {<br /> | |
| $row = $query->row(); | |
| <br /><br /> | |
| echo $row->title;<br /> | |
| echo $row->name;<br /> | |
| echo $row->body;<br /> | |
| } | |
| </code> | |
| <p>If you want a specific row returned you can submit the row number as a digit in the first parameter: | |
| <code>$row = $query->row(<dfn>5</dfn>);</code> | |
| <h2>row_array()</h2> | |
| <p>Identical to the above <var>row()</var> function, except it returns an array. Example:</p> | |
| <code> | |
| $query = $this->db->query("YOUR QUERY");<br /> | |
| <br /> | |
| if ($query->num_rows() > 0)<br /> | |
| {<br /> | |
| $row = $query->row_array(); | |
| <br /><br /> | |
| echo $row['title'];<br /> | |
| echo $row['name'];<br /> | |
| echo $row['body'];<br /> | |
| } | |
| </code> | |
| <p>If you want a specific row returned you can submit the row number as a digit in the first parameter: | |
| <code>$row = $query->row_array(<dfn>5</dfn>);</code> | |
| <p>In addition, you can walk forward/backwards/first/last through your results using these variations:</p> | |
| <p> | |
| <strong>$row = $query->first_row()</strong><br /> | |
| <strong>$row = $query->last_row()</strong><br /> | |
| <strong>$row = $query->next_row()</strong><br /> | |
| <strong>$row = $query->previous_row()</strong> | |
| </p> | |
| <p>By default they return an object unless you put the word "array" in the parameter:</p> | |
| <p> | |
| <strong>$row = $query->first_row('array')</strong><br /> | |
| <strong>$row = $query->last_row('array')</strong><br /> | |
| <strong>$row = $query->next_row('array')</strong><br /> | |
| <strong>$row = $query->previous_row('array')</strong> | |
| </p> | |
| <h1><br />Query Result Helpers</h1> | |
| <p>The following functions provide useful information when dealing with query results.</p> | |
| <h2>$query->num_rows()</h2> | |
| <p>The number of rows returned by the query. Note: <dfn>$query</dfn> is the variable that the query was assigned to:</p> | |
| <code>$query = $this->db->query('SELECT * FROM my_table');<br /><br /> | |
| echo $query->num_rows(); | |
| </code> | |
| <h2>$query->num_fields()</h2> | |
| <p>The number of FIELDS returned by the query. Make sure to call the function using your query result object:</p> | |
| <code>$query = $this->db->query('SELECT * FROM my_table');<br /><br /> | |
| echo $query->num_fields(); | |
| </code> | |
| <h2>$this->db->insert_id()</h2> | |
| <p>The insert ID number when performing database inserts.</p> | |
| <h2>$this->db->affected_rows()</h2> | |
| <p>Displays the number of affected rows, when doing "write" type queries (insert, update, etc.).</p> | |
| </p>Note: In MySQL "DELETE FROM TABLE" returns 0 affected rows. The database class has a small hack that allows it to return the | |
| correct number of affected rows. By default this hack is enabled but it can be turned off in the database driver file.</p> | |
| <h2>$this->db->version()</h2> | |
| <p>Outputs the database version you are running:</p> | |
| <code>echo $this->db->version();</code> | |
| </div> | |
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