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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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>mysqli_connect</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN137914"
></A
><P
>    (PHP 5)</P
>mysqli_connect<P
>    (no version information, might be only in CVS)</P
>mysqli-&#62;__construct()&nbsp;--&nbsp;Open a new connection to the MySQL server</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN137918"
></A
><H2
>说明</H2
><P
>Procedural style</P
>mysqli <B
CLASS="methodname"
>mysqli_connect</B
> ( [string host [, string username [, string passwd [, string dbname [, int port [, string socket]]]]]] )<BR
></BR
><P
>Object oriented style (constructor):</P
>class <B
CLASS="classname"
>mysqli</B
> { <BR
></BR
><B
CLASS="methodname"
>__construct</B
> ( [string host [, string username [, string passwd [, string dbname [, int port [, string socket]]]]]] )<BR
></BR
>}<P
>&#13;   Opens a connection to the MySQL Server running on.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN137967"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>host</CODE
></DT
><DD
><P
>&#13;       Can be either a host name or an IP address. Passing the <TT
CLASS="constant"
><B
>NULL</B
></TT
> value
       or the string "localhost" to this parameter, the local host is
       assumed. When possible, pipes will be used instead of the TCP/IP
       protocol.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>username</CODE
></DT
><DD
><P
>&#13;       The MySQL user name.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>passwd</CODE
></DT
><DD
><P
>&#13;       If provided or <TT
CLASS="constant"
><B
>NULL</B
></TT
>, the MySQL server will attempt to authenticate
       the user against those user records which have no password only. This
       allows one username to be used with different permissions (depending
       on if a password as provided or not).
      </P
></DD
><DT
><CODE
CLASS="parameter"
>dbname</CODE
></DT
><DD
><P
>&#13;       If provided will specify the default database to be used when
       performing queries.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>port</CODE
></DT
><DD
><P
>&#13;       Specifies the port number to attempt to connect to the MySQL server.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>socket</CODE
></DT
><DD
><P
>&#13;       Specifies the socket or named pipe that should be used.
      </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
        Specifying the <CODE
CLASS="parameter"
>socket</CODE
> parameter will not
        explicitly determine the type of connection to be used when
        connecting to the MySQL server. How the connection is made to the
        MySQL database is determined by the <CODE
CLASS="parameter"
>host</CODE
>
        parameter.
       </P
></BLOCKQUOTE
></DIV
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138007"
></A
><H2
>返回值</H2
><P
>&#13;   Returns a object which represents the connection to a MySQL Server or
   <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if the connection failed.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138011"
></A
><H2
>范例</H2
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></A
><P
><B
>例 1. Object oriented style</B
></P
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$mysqli </font><font color="#007700">= new </font><font color="#0000BB">mysqli</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">mysqli_connect_errno</font><font color="#007700">()) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br />&nbsp;&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Host information: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">host_info</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$mysqli</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN138016"
></A
><P
><B
>例 2. Procedural style</B
></P
><TABLE
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><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$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">"world"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (!</font><font color="#0000BB">$link</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br />&nbsp;&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Host information: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_get_host_info</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">));<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">?&gt;</font>
</font>
</code></TD
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><P
>上例将输出：</P
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><PRE
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>Host information: Localhost via UNIX socket</PRE
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