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| admin | 9fc347d | 2006-09-21 00:00:28 +0000 | [diff] [blame] | 36 | <td><h1>Code Igniter User Guide Version 1.4.1</h1></td>
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| admin | b0dd10f | 2006-08-25 17:25:49 +0000 | [diff] [blame] | 37 | <td id="breadcrumb_right"><a href="../../toc.html">Full Table of Contents</a></td>
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| 47 | <td id="breadcrumb">
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| 48 | <a href="http://www.codeigniter.com/">Code Igniter Home</a> ›
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| 49 | <a href="../../index.html">User Guide Home</a> ›
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| 50 | <a href="index.html">Database Library</a> ›
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| 51 | Query Results
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| 52 | </td>
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| 53 | <td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="www.codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
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| 60 |
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| 61 |
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| 62 | <!-- START CONTENT -->
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| 63 | <div id="content">
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| 64 |
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| 65 |
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| 66 |
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| 67 | <h1>Query Results</h1>
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| 68 |
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| 69 |
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| 70 | <p>There are several ways to generate query results:</p>
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| 71 |
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| 72 | <h2>result()</h2>
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| 73 |
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| 74 | <p>This function returns the query result as an array of <strong>objects</strong>, or <strong>FALSE</strong> on failure.
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| 75 |
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| 76 | Typically you'll use this in a foreach loop, like this:</p>
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| 77 |
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| 78 | <code>
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| 79 | $query = $this->db->query("YOUR QUERY");<br />
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| 80 | <br />
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| 81 | foreach ($query->result() as $row)<br />
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| 82 | {<br />
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| 83 | echo $row->title;<br />
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| 84 | echo $row->name;<br />
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| 85 | echo $row->body;<br />
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| 86 | }</code>
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| 87 |
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| 88 | <p>If you run queries that might <strong>not</strong> produce a result, you are encouraged to test the result first:</p>
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| 89 |
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| 90 | <code>
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| 91 | $query = $this->db->query("YOUR QUERY");<br />
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| 92 | <br />
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| 93 | if ($query->num_rows() > 0)<br />
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| 94 | {<br />
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| 95 | foreach ($query->result() as $row)<br />
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| 96 | {<br />
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| 97 | echo $row->title;<br />
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| 98 | echo $row->name;<br />
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| 99 | echo $row->body;<br />
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| 100 | }<br />
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| 101 | }
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| 102 | </code>
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| 103 |
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| 104 | <h2>result_array()</h2>
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| 105 |
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| 106 | <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>
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| 107 | <code>
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| 108 | $query = $this->db->query("YOUR QUERY");<br />
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| 109 | <br />
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| 110 | foreach ($query->result_array() as $row)<br />
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| 111 | {<br />
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| 112 | echo $row['title'];<br />
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| 113 | echo $row['name'];<br />
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| 114 | echo $row['body'];<br />
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| 115 | }</code>
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| 116 |
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| 117 |
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| 118 | <h2>row()</h2>
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| 119 |
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| 120 | <p>This function returns a single result row. If your query has more than one row, it returns only the first row.
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| 121 | The result is returned as an <strong>object</strong>. Here's a usage example:</p>
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| 122 | <code>
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| 123 | $query = $this->db->query("YOUR QUERY");<br />
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| 124 | <br />
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| 125 | if ($query->num_rows() > 0)<br />
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| 126 | {<br />
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| 127 | $row = $query->row();
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| 128 | <br /><br />
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| 129 | echo $row->title;<br />
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| 130 | echo $row->name;<br />
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| 131 | echo $row->body;<br />
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| 132 | }
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| 133 | </code>
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| 134 |
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| 135 | <p>If you want a specific row returned you can submit the row number as a digit in the first parameter:
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| 136 |
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| 137 | <code>$row = $query->row(<dfn>5</dfn>);</code>
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| 138 |
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| 139 |
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| 140 | <h2>row_array()</h2>
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| 141 |
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| 142 | <p>Identical to the above <var>row()</var> function, except it returns an array. Example:</p>
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| 143 |
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| 144 | <code>
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| 145 | $query = $this->db->query("YOUR QUERY");<br />
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| 146 | <br />
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| 147 | if ($query->num_rows() > 0)<br />
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| 148 | {<br />
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| 149 | $row = $query->row_array();
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| 150 | <br /><br />
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| 151 | echo $row['title'];<br />
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| 152 | echo $row['name'];<br />
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| 153 | echo $row['body'];<br />
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| 154 | }
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| 155 | </code>
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| 156 |
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| 157 |
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| 158 | <p>If you want a specific row returned you can submit the row number as a digit in the first parameter:
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| 159 |
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| 160 | <code>$row = $query->row_array(<dfn>5</dfn>);</code>
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| 161 |
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| 162 |
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| 163 | <p>In addition, you can walk forward/backwards/first/last through your results using these variations:</p>
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| 164 |
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| 165 | <p>
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| 166 | <strong>$row = $query->first_row()</strong><br />
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| 167 | <strong>$row = $query->last_row()</strong><br />
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| 168 | <strong>$row = $query->next_row()</strong><br />
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| 169 | <strong>$row = $query->previous_row()</strong>
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| 170 | </p>
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| 171 |
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| 172 | <p>By default they return an object unless you put the word "array" in the parameter:</p>
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| 173 |
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| 174 | <p>
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| 175 | <strong>$row = $query->first_row('array')</strong><br />
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| 176 | <strong>$row = $query->last_row('array')</strong><br />
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| 177 | <strong>$row = $query->next_row('array')</strong><br />
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| 178 | <strong>$row = $query->previous_row('array')</strong>
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| 179 | </p>
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| 180 |
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| 181 |
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| 182 | <h1><br />Query Result Helpers</h1>
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| 183 |
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| 184 | <p>The following functions provide useful information when dealing with query results.</p>
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| 185 |
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| 186 | <h2>$query->num_rows()</h2>
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| 187 | <p>The number of rows returned by the query. Note: <dfn>$query</dfn> is the variable that the query was assigned to:</p>
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| 188 |
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| 189 | <code>$query = $this->db->query('SELECT * FROM my_table');<br /><br />
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| 190 | echo $query->num_rows();
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| 191 | </code>
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| 192 |
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| 193 | <h2>$query->num_fields()</h2>
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| 194 | <p>The number of FIELDS returned by the query. Make sure to call the function using your query result object:</p>
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| 195 |
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| 196 | <code>$query = $this->db->query('SELECT * FROM my_table');<br /><br />
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| 197 | echo $query->num_fields();
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| 198 | </code>
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| 199 |
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| 200 |
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| 201 | <h2>$this->db->insert_id()</h2>
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| 202 | <p>The insert ID number when performing database inserts.</p>
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| 203 |
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| 204 | <h2>$this->db->affected_rows()</h2>
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| 205 | <p>Displays the number of affected rows, when doing "write" type queries (insert, update, etc.).</p>
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| 206 | </p>Note: In MySQL "DELETE FROM TABLE" returns 0 affected rows. The database class has a small hack that allows it to return the
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| 207 | correct number of affected rows. By default this hack is enabled but it can be turned off in the database driver file.</p>
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| 208 |
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| 209 |
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| 210 | <h2>$this->db->version()</h2>
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| 211 | <p>Outputs the database version you are running:</p>
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| 212 |
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| 213 | <code>echo $this->db->version();</code>
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| 214 |
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| 215 |
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| 216 |
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| 217 |
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| 218 |
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| 219 | </div>
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| 220 | <!-- END CONTENT -->
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| 221 |
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| 222 |
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| 223 | <div id="footer">
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| 224 | <p>
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| 225 | Previous Topic: <a href="queries.html">Queries</a>
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| 226 | ·
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| 228 | <a href="../../index.html">User Guide Home</a> ·
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| 229 | Next Topic: <a href="active_record.html">Active Record Pattern</a>
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