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>mysqli_change_user</H1
><DIV
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><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
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><DIV
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><A
NAME="AEN133053"
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><P
><B
>Exemplo 1. Estilo orientado a objetos</B
></P
><TABLE
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><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
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CLASS="EXAMPLE"
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CLASS="example"
><A
NAME="AEN133056"
></A
><P
><B
>Exemplo 2. Estilo de procedimentos</B
></P
><TABLE
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><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
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></DIV
></TD
></TR
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><P
> Os exempos acima irão produzir a seguinte saída:
</P
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><PRE
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>Default database: world
Value of variable a is NULL</PRE
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