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class="breadcrumbs__link" itemprop="item" href="/awSQL/category/classes"><span itemprop="name">Classes</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">AlterTable</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>AlterTable</h1></header>
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<p>Modifies an existing table by altering its structure.</p>
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<hr>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="methods">Methods<a href="#methods" class="hash-link" aria-label="Direct link to Methods" title="Direct link to Methods"></a></h2>
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<hr>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="selectdatabase">selectDatabase()<a href="#selectdatabase" class="hash-link" aria-label="Direct link to selectDatabase()" title="Direct link to selectDatabase()"></a></h3>
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<p>→ (<code>database</code> = <strong>String</strong>) → <code>this</code></p>
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<p>Switches to a different database for this query.</p>
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<p><strong>Parameters</strong></p>
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<table><thead><tr><th>Parameter</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td><code>database</code></td><td><strong>String</strong></td><td>The name of the database to select.</td></tr></tbody></table>
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<p><strong>Returns</strong></p>
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<p>→ <code>this</code></p>
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<hr>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="structure">structure()<a href="#structure" class="hash-link" aria-label="Direct link to structure()" title="Direct link to structure()"></a></h3>
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<p>→ (<code>structure</code> = <a href="/awSQL/classes/structure">Structure</a>) → <code>this</code></p>
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<p>Defines the new table structure.</p>
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<p><strong>Behavrior</strong></p>
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<ul>
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<li><strong>Drops</strong> columns that exist in the current table but not in the new structure.</li>
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<li><strong>Adds</strong> missing columns.</li>
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<li><strong>Modifies</strong> columns where datatypes differ.</li>
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</ul>
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<p><strong>Parameters</strong></p>
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<table><thead><tr><th>Parameter</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td><code>structure</code></td><td><a href="/awSQL/classes/structure">Structure</a></td><td>The new structure definition.</td></tr></tbody></table>
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<p><strong>Returns</strong></p>
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<p>→ <code>this</code></p>
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<hr>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="execute">execute()<a href="#execute" class="hash-link" aria-label="Direct link to execute()" title="Direct link to execute()"></a></h3>
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<p><code>async</code> → () → <a href="/awSQL/classes/instance#checkstructure">Instance.checkStructure()</a></p>
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<p>Executes the prepared table alteration query.</p>
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<div class="theme-admonition theme-admonition-warning admonition_xJq3 alert alert--warning"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 16 16"><path fill-rule="evenodd" d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z"></path></svg></span>Important</div><div class="admonitionContent_BuS1"><p>The <a href="#structure">structure()</a> method <strong>must</strong> be called before executing, or the operation may fail.</p></div></div>
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<p><strong>Returns</strong></p>
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<p>→ <a href="/awSQL/classes/instance#checkstructure">Instance.checkStructure()</a> - Performs a post-execution structure check and returns the result.</p>
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