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Verwenden Sie MySQLI_Result :: Fetch_Column, um Daten zu extrahieren und mit externen APIs zu kombinieren

gitbox 2025-08-22 
<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// Dies hängt nicht mit dem Inhalt des Artikels zusammenPHPCodebeispiel，Demonstrieren Sie Datenbankverbindungen und einfache Abfragen</span></span><span>
</span><span><span class="hljs-variable">$mysqli</span></span><span> = </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title function_ invoke__">mysqli</span></span><span>(</span><span><span class="hljs-string">"localhost"</span></span><span>, </span><span><span class="hljs-string">"user"</span></span><span>, </span><span><span class="hljs-string">"password"</span></span><span>, </span><span><span class="hljs-string">"database"</span></span><span>);
</span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable">$mysqli</span></span><span>-&gt;connect_errno) {
    </span><span><span class="hljs-keyword">die</span></span><span>(</span><span><span class="hljs-string">"Verbindung ist fehlgeschlagen: "</span></span><span> . </span><span><span class="hljs-variable">$mysqli</span></span><span>-&gt;connect_error);
}
</span><span><span class="hljs-variable">$query</span></span><span> = </span><span><span class="hljs-string">"SELECT id, name FROM users LIMIT 5"</span></span><span>;
</span><span><span class="hljs-variable">$result</span></span><span> = </span><span><span class="hljs-variable">$mysqli</span></span><span>-&gt;</span><span><span class="hljs-title function_ invoke__">query</span></span><span>(</span><span><span class="hljs-variable">$query</span></span><span>);
</span><span><span class="hljs-meta">?&gt;</span></span><span>

&lt;hr&gt;

</span><span><span class="hljs-meta">&lt;?php</span></span><span>
<span class="hljs-comment">/*
 * verwenden mysqli_result::fetch_column Daten extrahieren und extern extern API Kombinierte Verarbeitung
 *
 * existierenPHPMitte，mysqliErweiterung ist ein BetriebMySQL数据库的常verwendenVerfahren之一。
 * ausPHP 8.1erheben，mysqli_resultNeue Kategorie hinzugefügtfetch_columnVerfahren，
 * 可以直接提取查询结果Mitte的某一列，Bequem und schnell。
 *
 * 本文将介绍如何使verwendenfetch_columnEinzelspaltendaten extrahieren，Und fügen Sie die extrahierten Daten zum externen hinzuAPIKombinierte Verarbeitung，
 * 例如调verwenden一个Simulation的API，获取每个verwenden户的详细信息。
 */</span>

</span><span><span class="hljs-variable">$mysqli</span></span><span> = </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title function_ invoke__">mysqli</span></span><span>(</span><span><span class="hljs-string">"localhost"</span></span><span>, </span><span><span class="hljs-string">"user"</span></span><span>, </span><span><span class="hljs-string">"password"</span></span><span>, </span><span><span class="hljs-string">"database"</span></span><span>);
</span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable">$mysqli</span></span><span>-&gt;connect_errno) {
    </span><span><span class="hljs-keyword">die</span></span><span>(</span><span><span class="hljs-string">"Verbindung ist fehlgeschlagen: "</span></span><span> . </span><span><span class="hljs-variable">$mysqli</span></span><span>-&gt;connect_error);
}

</span><span><span class="hljs-comment">// 查询verwenden户IDListe</span></span><span>
</span><span><span class="hljs-variable">$sql</span></span><span> = </span><span><span class="hljs-string">"SELECT id FROM users"</span></span><span>;
</span><span><span class="hljs-variable">$result</span></span><span> = </span><span><span class="hljs-variable">$mysqli</span></span><span>-&gt;</span><span><span class="hljs-title function_ invoke__">query</span></span><span>(</span><span><span class="hljs-variable">$sql</span></span><span>);

</span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-variable">$result</span></span><span>) {
    </span><span><span class="hljs-keyword">die</span></span><span>(</span><span><span class="hljs-string">"Abfrage fehlgeschlagen: "</span></span><span> . </span><span><span class="hljs-variable">$mysqli</span></span><span>-&gt;error);
}

</span><span><span class="hljs-comment">// 使verwendenfetch_column提取所有verwenden户ID，Kehren Sie zum Array zurück</span></span><span>
</span><span><span class="hljs-variable">$user_ids</span></span><span> = [];
</span><span><span class="hljs-keyword">while</span></span><span> (</span><span><span class="hljs-variable">$id</span></span><span> = </span><span><span class="hljs-variable">$result</span></span><span>-&gt;</span><span><span class="hljs-title function_ invoke__">fetch_column</span></span><span>(</span><span><span class="hljs-number">0</span></span><span>)) {  </span><span><span class="hljs-comment">// Parameter0Zeigt an, die erste Spalte zu nehmen</span></span><span>
    </span><span><span class="hljs-variable">$user_ids</span></span><span>[] = </span><span><span class="hljs-variable">$id</span></span><span>;
}

</span><span><span class="hljs-comment">// Schließen Sie das Abfrageergebnissatz</span></span><span>
</span><span><span class="hljs-variable">$result</span></span><span>-&gt;</span><span><span class="hljs-title function_ invoke__">free</span></span><span>();

</span><span><span class="hljs-comment">// Simulation调verwenden外部API，根据verwenden户ID批量获取verwenden户信息</span></span><span>
</span><span><span class="hljs-comment">// 这里我们verwenden一个简单函数代替真实API调verwenden</span></span><span>
</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">getUserInfoFromApi</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-keyword">array</span></span></span><span> </span><span><span class="hljs-variable">$ids</span></span><span>): </span><span><span class="hljs-title">array</span></span><span> {
    </span><span><span class="hljs-variable">$data</span></span><span> = [];
    </span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$ids</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$id</span></span><span>) {
        </span><span><span class="hljs-comment">// SimulationAPIGeben Sie die Datenstruktur zurück</span></span><span>
        </span><span><span class="hljs-variable">$data</span></span><span>[</span><span><span class="hljs-variable">$id</span></span><span>] = [
            </span><span><span class="hljs-string">'id'</span></span><span> =&gt; </span><span><span class="hljs-variable">$id</span></span><span>,
            </span><span><span class="hljs-string">'name'</span></span><span> =&gt; </span><span><span class="hljs-string">"User_<span class="hljs-subst">$id</span></span></span><span>",
            </span><span><span class="hljs-string">'email'</span></span><span> =&gt; </span><span><span class="hljs-string">"user<span class="hljs-subst">{$id}</span></span></span><span>@example.com",
        ];
    }
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-variable">$data</span></span><span>;
}

</span><span><span class="hljs-comment">// 调verwendenAPIHolen Sie sich detaillierte Informationen</span></span><span>
</span><span><span class="hljs-variable">$user_details</span></span><span> = </span><span><span class="hljs-title function_ invoke__">getUserInfoFromApi</span></span><span>(</span><span><span class="hljs-variable">$user_ids</span></span><span>);

</span><span><span class="hljs-comment">// Verarbeiten und ausgeben das Ergebnis</span></span><span>
</span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$user_details</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$user</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"verwenden户ID: <span class="hljs-subst">{$user['id']}</span></span></span><span>&lt;br&gt;";
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Name: <span class="hljs-subst">{$user['name']}</span></span></span><span>&lt;br&gt;";
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Post: <span class="hljs-subst">{$user['email']}</span></span></span><span>&lt;br&gt;&lt;hr&gt;";
}

</span><span><span class="hljs-variable">$mysqli</span></span><span>-&gt;</span><span><span class="hljs-title function_ invoke__">close</span></span><span>();
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>
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