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	<title>Diário de um DBA &#187; metadados</title>
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		<title>Verificando a existência de objetos</title>
		<link>http://silasmendes.com/dba/metadados-verificando-a-existencia-de-objetos</link>
		<comments>http://silasmendes.com/dba/metadados-verificando-a-existencia-de-objetos#comments</comments>
		<pubDate>Fri, 21 Aug 2009 14:17:22 +0000</pubDate>
		<dc:creator>Silas Mendes</dc:creator>
				<category><![CDATA[Dicas]]></category>
		<category><![CDATA[Programação]]></category>
		<category><![CDATA[SQL SERVER 2000]]></category>
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		<guid isPermaLink="false">http://silasmendes.com/dba/?p=230</guid>
		<description><![CDATA[Uma necessidade comum de muitos desenvolvedores é verificar a existência de objetos no banco de dados. Veja nesse artigo como fazer isto, consultando os metadados do SQL Server. <a href="http://silasmendes.com/dba/metadados-verificando-a-existencia-de-objetos">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
			<content:encoded><![CDATA[<p class="MsoNormal">Uma necessidade comum de muitos desenvolvedores é verificar a existência de objetos no banco de dados. Então vou fazer aqui uma rapidinha com exemplos bem básicos, pras situações mais comuns, vamos lá:</p>
<p class="MsoNormal">A tabela <strong>tb_Pedido</strong> existe no banco?</p>
<blockquote>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">use</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"> [meuBanco]</span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">GO</span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">if</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"><span style="mso-spacerun: yes;"> </span><span style="color: gray;">exists</span> </span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: gray; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">(</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">select</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"> <span style="color: gray;">*</span> <span style="color: blue;">from</span> information_schema<span style="color: gray;">.</span>tables <span style="color: blue;">where</span> table_name <span style="color: gray;">=</span> <span style="color: red;">&#8216;tb_pedido&#8217;</span><span style="color: gray;">)</span></span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-no-proof: yes;">print</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-no-proof: yes;"> <span style="color: red;">&#8216;Tabela existe&#8217;</span></span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-no-proof: yes;">else</span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-no-proof: yes;">print</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-no-proof: yes;"> <span style="color: red;">&#8216;Tabela não existe&#8217;</span></span></p>
<p class="MsoNormal"> </p>
</blockquote>
<p class="MsoNormal">Quais tabelas no banco possuem a coluna <strong>cod_cliente</strong>?</p>
<blockquote>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">use</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"> [meuBanco]</span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-no-proof: yes;">GO</span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">select</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"> table_name<span style="color: gray;">,</span> data_type </span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">from</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"> information_schema<span style="color: gray;">.</span>columns </span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">where</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"> column_name <span style="color: gray;">=</span> <span style="color: red;">&#8216;cod_cliente&#8217;</span></span></p>
</blockquote>
<p class="MsoNormal"><span style="mso-ansi-language: EN-US;" lang="EN-US"> </span></p>
<p class="MsoNormal">A coluna <strong>cod_cliente</strong> existe na tabela <strong>tb_Pedido</strong>? Se não existe, adicionar:</p>
<blockquote>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-no-proof: yes;">use</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-no-proof: yes;"> [meuBanco]</span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">GO</span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">if</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"><span style="mso-spacerun: yes;"> </span><span style="color: gray;">exists</span> </span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: gray; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">(</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">select</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"> <span style="color: gray;">*</span> <span style="color: blue;">from</span> information_schema<span style="color: gray;">.</span>columns </span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US">where</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"> table_name <span style="color: gray;">=</span> <span style="color: red;">&#8216;tb_pedido&#8217;</span> <span style="color: gray;">and</span> column_name <span style="color: gray;">=</span> <span style="color: red;">&#8216;cod_cliente&#8217;</span><span style="color: gray;">)</span></span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-ansi-language: EN-US; mso-no-proof: yes;" lang="EN-US"><span style="mso-tab-count: 1;"> </span></span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-no-proof: yes;">print</span><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; mso-no-proof: yes;"> <span style="color: red;">&#8216;Coluna existe.&#8217;</span></span></p>
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; font-family: &quot;Courier New&quot;; color: blue; mso-no-proof: yes;">else</span></p>
<p class="MsoNormal"><span style="font-size: 10.0pt; line-height: 115%; font-family: &quot;Courier New&quot;; mso-no-proof: yes;"><span style="color: blue;">alter</span> <span style="color: blue;">table</span> tb_pedido <span style="color: blue;">add</span> cod_cliente <span style="color: blue;">int</span></span></p>
</blockquote>
<p class="MsoNormal"><span style="font-size: 10.0pt; line-height: 115%; font-family: &quot;Courier New&quot;; mso-no-proof: yes;"><span style="color: blue;"><br />
</span></span></p>
<p class="MsoNormal">Observe que nos três exemplos acima, utilizamos as seguintes views de metadados:</p>
<ul>
<li><strong>information_schema.tables</strong> – que apresenta diversas informações sobre as tabelas de um banco.</li>
<li><strong>information_schema.columns</strong> – que apresenta informações sobre as colunas, das tabelas de um banco.</li>
</ul>
<p class="MsoNormal">Ok, mas afinal o que são <strong>METADADOS</strong>?</p>
<p class="MsoNormal">A definição mais comum é: <strong>informação sobre os dados</strong>. Esta definição não é muito amigável, eu sei, mas o que você precisa saber é que todos os objetos que você cria no banco, como tabelas, procedures, índices, etc, tem suas informações armazenadas em <strong>tabelas de sistema</strong> do SQL Server e as views utilizadas neste post buscam esses dados nas tabelas de sistema.</p>
<p class="MsoNormal">Comentaremos mais sobre metadados em outro posts, mas se você deseja se aprofundar no assunto, dê uma estudada neste <a href="http://msdn.microsoft.com/en-us/library/ms186778.aspx" target="_blank">link</a>.</p>
<p class="MsoNormal">Até +</p>
]]></content:encoded>
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		</item>
		<item>
		<title>Consultando objetos do banco</title>
		<link>http://silasmendes.com/dba/sql-server-consultando-metadados</link>
		<comments>http://silasmendes.com/dba/sql-server-consultando-metadados#comments</comments>
		<pubDate>Tue, 02 Sep 2008 23:15:03 +0000</pubDate>
		<dc:creator>Silas Mendes</dc:creator>
				<category><![CDATA[Dicas]]></category>
		<category><![CDATA[Programação]]></category>
		<category><![CDATA[SQL SERVER 2000]]></category>
		<category><![CDATA[SQL SERVER 2005]]></category>
		<category><![CDATA[SQL SERVER 2008]]></category>
		<category><![CDATA[SQL SERVER 2008 R2]]></category>
		<category><![CDATA[SQL SERVER 7]]></category>
		<category><![CDATA[information_schema]]></category>
		<category><![CDATA[metadados]]></category>
		<category><![CDATA[Sql Server]]></category>
		<category><![CDATA[system table]]></category>

		<guid isPermaLink="false">http://diariodba.wordpress.com/?p=76</guid>
		<description><![CDATA[  Durante o processo de desenvolvimento é comum realizar consultas a metadados, ou seja, consultas que retornam informações sobre o próprio banco; algo como a consulta abaixo,  que retorna todas as tabelas de um determinado banco, junto com o nome &#8230; <a href="http://silasmendes.com/dba/sql-server-consultando-metadados">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
			<content:encoded><![CDATA[<p style="margin:0 0 10pt;"> </p>
<p style="margin:0 0 10pt;">Durante o processo de desenvolvimento é comum realizar consultas a metadados, ou seja, consultas que retornam informações sobre o próprio banco; algo como a consulta abaixo,  que retorna todas as tabelas de um determinado banco, junto com o nome de suas colunas e o tipo de dados:</p>
<blockquote><p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:'Courier New';">SELECT</span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:'Courier New';"><span> </span>t<span style="color:#808080;">.</span>name <span> </span>nome_tabela<span style="color:#808080;">,</span></span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:'Courier New';"><span> </span>c<span style="color:#808080;">.</span>name <span> </span>nome_coluna<span style="color:#808080;">,</span></span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:'Courier New';"><span> </span>ty<span style="color:#808080;">.</span>name <span> </span>tipo_dado</span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:'Courier New';">FROM</span><span style="font-size:10pt;font-family:'Courier New';"> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:'Courier New';"><span> </span></span><span style="font-size:10pt;color:#008000;font-family:'Courier New';">sysobjects</span><span style="font-size:10pt;font-family:'Courier New';"> t<span style="color:#808080;">,</span> <span style="color:#008000;">syscolumns</span> c<span style="color:#808080;">,</span> <span style="color:#008000;">systypes</span> ty</span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:'Courier New';">WHERE</span><span style="font-size:10pt;font-family:'Courier New';"> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:'Courier New';"><span> </span>t<span style="color:#808080;">.</span>id <span style="color:#808080;">=</span> c<span style="color:#808080;">.</span>id <span style="color:#808080;">AND</span></span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:'Courier New';"><span> </span>t<span style="color:#808080;">.</span><span style="color:#0000ff;">type</span> <span style="color:#808080;">=</span> <span style="color:#ff0000;">&#8216;U&#8217;</span> <span style="color:#808080;">AND</span></span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:'Courier New';"><span> </span>c<span style="color:#808080;">.</span>xtype <span style="color:#808080;">=</span> ty<span style="color:#808080;">.</span><span style="color:#0000ff;">type</span></span></p>
</blockquote>
<p style="margin:0 0 10pt;"> </p>
<p style="margin:0 0 10pt;">Isto está errado?</p>
<p style="margin:0 0 10pt;"><strong>Não.</strong></p>
<p style="margin:0 0 10pt;">No entanto não é uma <em>boa prática</em> realizar consultas diretamente nas tabelas de sistema. Além do esforço em entender a estrutura dessas informações e construir a query, existe a possibilidade de no futuro a Microsoft descontinuar ou alterar a estrutura de umas dessas tabelas. <em>E aí?</em> O que acontece com sua aplicação que estava buscando dados naquela estrutura?</p>
<p style="margin:0 0 10pt;">Para evitar esse tipo de problemas, a partir da versão 7 do Microsoft SQL Server surgiram as <em>Information Schema Views,</em> um catálogo de views de metadados desenvolvidas de acordo com padrões ISO, onde a idéia é que os dados serão retornados, independente da versão do SQL Server, logo se houverem mudanças nas tabelas de sistema, sua aplicação não será afetada porque ela está buscando dados de uma view, além disso, a forma de consulta é muito simples. Veja:</p>
<p style="margin:0 0 10pt;">Se você quer obter os mesmos dados da consulta acima utilizando uma dessas views, precisa somente disto:</p>
<blockquote><p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:&quot;">SELECT</span><span style="font-size:10pt;font-family:&quot;"> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:&quot;"><span> </span>TABLE_NAME<span style="color:#808080;">,</span> COLUMN_NAME<span style="color:#808080;">,</span> DATA_TYPE</span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:&quot;">FROM</span></p>
<p class="MsoNormal" style="margin:0 0 10pt;"><span style="font-size:10pt;line-height:115%;font-family:&quot;"><span> </span><span style="color:#008000;">INFORMATION_SCHEMA</span><span style="color:#808080;">.</span><span style="color:#008000;">COLUMNS</span></span></p>
</blockquote>
<p style="margin:0 0 10pt;"> </p>
<p style="margin:0 0 10pt;">Veja como é mais simples.</p>
<p style="margin:0 0 10pt;">Quer consultar todas as tabelas de sua base que comecem com <em>tb_pedido</em>? Então tente isso:</p>
<blockquote><p class="MsoNormal" style="margin:0 0 10pt;"><span style="font-size:small;font-family:Calibri;"> <span style="font-family: Georgia; line-height: normal; color: #0000ff;">SELECT</span></span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:&quot;"><span> </span>TABLE_NAME </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:&quot;">FROM</span><span style="font-size:10pt;font-family:&quot;"> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:&quot;"><span> </span><span style="color:#008000;">INFORMATION_SCHEMA</span><span style="color:#808080;">.</span><span style="color:#008000;">TABLES</span> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:&quot;">WHERE</span><span style="font-size:10pt;font-family:&quot;"> </span></p>
<p class="MsoNormal" style="margin:0 0 10pt;"><span style="font-size:10pt;line-height:115%;font-family:&quot;"><span> </span></span><span style="font-size:10pt;line-height:115%;font-family:&quot;">TABLE_NAME <span style="color:#808080;">like</span> <span style="color:#ff0000;">&#8216;tb_pedido%&#8217;</span></span></p>
</blockquote>
<p class="MsoNormal" style="margin:0 0 10pt;"> </p>
<p style="margin:0 0 10pt;"> </p>
<p style="margin:0 0 10pt;">Se quiser consultar todas as procedures que iniciam com <em>‘listar%’</em> utilize:</p>
<blockquote><p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:&quot;">SELECT</span><span style="font-size:10pt;font-family:&quot;"> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:&quot;"><span> </span><span style="color:#808080;">*</span> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:&quot;">FROM</span><span style="font-size:10pt;font-family:&quot;"> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;font-family:&quot;"><span> </span><span style="color:#008000;">INFORMATION_SCHEMA</span><span style="color:#808080;">.</span><span style="color:#008000;">ROUTINES</span> </span></p>
<p class="MsoNormal" style="line-height:normal;margin:0;"><span style="font-size:10pt;color:#0000ff;font-family:&quot;">WHERE</span><span style="font-size:10pt;font-family:&quot;"> </span></p>
<p class="MsoNormal" style="margin:0 0 10pt;"><span style="font-size:10pt;line-height:115%;font-family:&quot;"><span> </span></span><span style="font-size:10pt;line-height:115%;font-family:&quot;">SPECIFIC_NAME <span style="color:#808080;">like</span> <span style="color:#ff0000;">&#8216;listar%&#8217;</span> <span style="color:#808080;">and</span> ROUTINE_TYPE <span style="color:#808080;">=</span> <span style="color:#ff0000;">&#8216;PROCEDURE&#8217;</span></span></p>
</blockquote>
<p style="margin:0 0 10pt;"> </p>
<p style="margin:0 0 10pt;">Além destas existem outras views que podem te auxiliar na consulta a metadados. Veja uma  lista completa <a title="Views Metadados" href="http://msdn.microsoft.com/en-us/library/ms186778.aspx" target="_blank">aqui</a>.</p>
<p style="margin:0 0 10pt;">Bom trabalho!</p>
<p class="MsoNormal" style="margin:0 0 10pt;"> </p>
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