<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >mysqli_change_user</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="MySQL Melhorada" HREF="ref.mysqli.html"><LINK REL="PREVIOUS" TITLE="mysqli_bind_result" HREF="function.mysqli-bind-result.html"><LINK REL="NEXT" TITLE="mysqli_character_set_name" HREF="function.mysqli-character-set-name.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.mysqli-bind-result.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.mysqli-character-set-name.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.mysqli-change-user" ></A >mysqli_change_user</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN132990" ></A ><P > (PHP 5)</P >mysqli_change_user<P > (no version information, might be only in CVS)</P >mysqli->change_user -- Modifica o usuário para a conexão com o banco de dados especificada</DIV ><DIV CLASS="refsect1" ><A NAME="AEN132994" ></A ><H2 >Descrição</H2 ><P >Estilo de procedimento:</P >bool <B CLASS="methodname" >mysqli_change_user</B > ( object link, string user, string password, string database )<BR ></BR ><P >Estilo orientado a objeto (metodo):</P >class <B CLASS="classname" >mysqli</B > { <BR ></BR >bool <B CLASS="methodname" >change_user</B > ( string user, string password, string database )<BR ></BR >}<P > <B CLASS="function" >mysqli_change_user()</B > é usado para mudar o usuário na conexão com o banco de dados especificado como indicado pelo parâmetro <CODE CLASS="parameter" >link</CODE > e definido para o banco de dados atual para o especificado pelo parâmetro <CODE CLASS="parameter" >database</CODE >. </P ><P > Se desejado, o valor <TT CLASS="constant" ><B >NULL</B ></TT > pode ser passado no lugar do parâmetro <CODE CLASS="parameter" >database</CODE > fazendo com que seja apenas mudado o usuário e não seja escolhido também um banco de dados. Para escolher um banco de dados neste caso, use a função <A HREF="function.mysqli-select-db.html" ><B CLASS="function" >mysqli_select_db()</B ></A >. </P ><P > Para poder mudar usuários de maneira correta, os parâmetors <CODE CLASS="parameter" >username</CODE > e <CODE CLASS="parameter" >password</CODE > devem ser válidos e este usuário deve ter permissões suficinte para acessar o banco de dados desejado. Se por alguma razão a autenticação falhar, o usuário atualmente autenticado irá permanecer. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >Nota: </B > Usar este comando fará sempre que a conexão atual com o banco de dados funcione como se fosse completamente uma nova conexão, não importando se a operação foi completada de maneira correta. Este reínicio incluí desfazer quaisquer transações ativas, fechar todas as tabelas temporarias e destravar todas as tabelas travadas. </P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN133041" ></A ><H2 >Valores de retorno</H2 ><P > Retorna <TT CLASS="constant" ><B >TRUE</B ></TT > em caso de sucesso ou <TT CLASS="constant" ><B >FALSE</B ></TT > em falhas. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN133046" ></A ><H2 >Veja também:</H2 ><P > <A HREF="function.mysqli-connect.html" ><B CLASS="function" >mysqli_connect()</B ></A > <A HREF="function.mysqli-select-db.html" ><B CLASS="function" >mysqli_select_db()</B ></A > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN133051" ></A ><H2 >Examplo</H2 ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN133053" ></A ><P ><B >Exemplo 1. Estilo orientado a objetos</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br /></font><font color="#FF8000">/* connect database test */<br /></font><font color="#0000BB">$mysqli </font><font color="#007700">= new </font><font color="#0000BB">mysqli</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"test"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">mysqli_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#FF8000">/* Set Variable a */<br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"SET @a:=1"</font><font color="#007700">);<br /> <br /></font><font color="#FF8000">/* reset all and select a new database */<br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">change_user</font><font color="#007700">(</font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"SELECT DATABASE()"</font><font color="#007700">)) {<br /> </font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">fetch_row</font><font color="#007700">();<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Default database: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">]);<br /> </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">"SELECT @a"</font><font color="#007700">)) {<br /> </font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">fetch_row</font><font color="#007700">();<br /> if (</font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">] === </font><font color="#0000BB">NULL</font><font color="#007700">) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Value of variable a is NULL\n"</font><font color="#007700">);<br /> }<br /> </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN133056" ></A ><P ><B >Exemplo 2. Estilo de procedimentos</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#FF8000">/* connect database test */<br /></font><font color="#0000BB">$link </font><font color="#007700">= </font><font color="#0000BB">mysqli_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"test"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (!</font><font color="#0000BB">$link</font><font color="#007700">) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#FF8000">/* Set Variable a */<br /></font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"SET @a:=1"</font><font color="#007700">);<br /> <br /></font><font color="#FF8000">/* reset all and select a new database */<br /></font><font color="#0000BB">mysqli_change_user</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"SELECT DATABASE()"</font><font color="#007700">)) {<br /> </font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">mysqli_fetch_row</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Default database: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">]);<br /> </font><font color="#0000BB">mysqli_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">mysqli_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"SELECT @a"</font><font color="#007700">)) {<br /> </font><font color="#0000BB">$row </font><font color="#007700">= </font><font color="#0000BB">mysqli_fetch_row</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br /> if (</font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">] === </font><font color="#0000BB">NULL</font><font color="#007700">) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Value of variable a is NULL\n"</font><font color="#007700">);<br /> }<br /> </font><font color="#0000BB">mysqli_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">mysqli_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ><P > Os exempos acima irão produzir a seguinte saída: </P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >Default database: world Value of variable a is NULL</PRE ></TD ></TR ></TABLE ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.mysqli-bind-result.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.mysqli-character-set-name.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >mysqli_bind_result</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.mysqli.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >mysqli_character_set_name</TD ></TR ></TABLE ></DIV ></BODY ></HTML >