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>PHP 手册</TH
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><H1
><A
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>maxdb_fetch_field</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN110694"
></A
><P
> (PECL)</P
>maxdb_fetch_field<P
> (no version information, might be only in CVS)</P
>result->fetch_field -- Returns the next field in the result set</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN110698"
></A
><H2
>Description</H2
><P
>Procedural style:</P
>mixed <B
CLASS="methodname"
>maxdb_fetch_field</B
> ( resource result )<BR
></BR
><P
>Object oriented style (method):</P
>class <B
CLASS="classname"
>result</B
> { <BR
></BR
>mixed <B
CLASS="methodname"
>fetch_field</B
> ( void )<BR
></BR
>}<P
> The <B
CLASS="function"
>maxdb_fetch_field()</B
> returns the definition of one column
of a result set as an resource. Call this function repeatedly to retrieve
information about all columns in the result set.
<B
CLASS="function"
>maxdb_fetch_field()</B
> returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
> when no more fields
are left.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN110719"
></A
><H2
>Return values</H2
><P
> Returns an resource which contains field definition informations or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if no field information
is available.
</P
><P
> <DIV
CLASS="table"
><A
NAME="AEN110724"
></A
><P
><B
>表 1. Object properties</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Property</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
>name</TD
><TD
>The name of the column</TD
></TR
><TR
><TD
>max_length</TD
><TD
>The maximum width of the field for the result set.</TD
></TR
><TR
><TD
>type</TD
><TD
>The data type used for this field</TD
></TR
><TR
><TD
>decimals</TD
><TD
>The number of decimals used (for integer fields)</TD
></TR
></TBODY
></TABLE
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN110744"
></A
><H2
>See also</H2
><P
> <A
HREF="function.maxdb-num-fields.html"
><B
CLASS="function"
>maxdb_num_fields()</B
></A
>
<A
HREF="function.maxdb-fetch-field-direct.html"
><B
CLASS="function"
>maxdb_fetch_field_direct()</B
></A
>
<A
HREF="function.maxdb-fetch-fields.html"
><B
CLASS="function"
>maxdb_fetch_fields()</B
></A
>
<A
HREF="function.maxdb-field-seek.html"
><B
CLASS="function"
>maxdb_field_seek()</B
></A
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN110751"
></A
><H2
>Example</H2
><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN110753"
></A
><P
><B
>例 1. Object oriented style</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br />$maxdb </font><font color="#007700">= new </font><font color="#0000BB">maxdb</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"MONA"</font><font color="#007700">, </font><font color="#DD0000">"RED"</font><font color="#007700">, </font><font color="#DD0000">"DEMODB"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">maxdb_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">maxdb_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">"SELECT name, cno from hotel.customer ORDER BY cno"</font><font color="#007700">;<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$maxdb</font><font color="#007700">-></font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#0000BB">$query</font><font color="#007700">)) {<br /><br /> </font><font color="#FF8000">/* Get field information for all columns */<br /> </font><font color="#007700">while (</font><font color="#0000BB">$finfo </font><font color="#007700">= </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">fetch_field</font><font color="#007700">()) {<br /><br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Name: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">name</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Table: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">table</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"max. Len: %d\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">max_length</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Flags: %d\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">flags</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Type: %d\n\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">type</font><font color="#007700">);<br /> }<br /> </font><font color="#0000BB">$result</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$maxdb</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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></TABLE
></DIV
></TD
></TR
></TABLE
><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN110756"
></A
><P
><B
>例 2. Procedural style</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br />$link </font><font color="#007700">= </font><font color="#0000BB">maxdb_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"MONA"</font><font color="#007700">, </font><font color="#DD0000">"RED"</font><font color="#007700">, </font><font color="#DD0000">"DEMODB"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">maxdb_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">maxdb_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">"SELECT name, cno from hotel.customer ORDER BY cno"</font><font color="#007700">;<br /><br />if (</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">maxdb_query</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#0000BB">$query</font><font color="#007700">)) {<br /><br /> </font><font color="#FF8000">/* Get field information for all fields */<br /> </font><font color="#007700">while (</font><font color="#0000BB">$finfo </font><font color="#007700">= </font><font color="#0000BB">maxdb_fetch_field</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">)) {<br /><br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Name: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">name</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Table: %s\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">table</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"max. Len: %d\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">max_length</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Flags: %d\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">flags</font><font color="#007700">);<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Type: %d\n\n"</font><font color="#007700">, </font><font color="#0000BB">$finfo</font><font color="#007700">-></font><font color="#0000BB">type</font><font color="#007700">);<br /> }<br /> </font><font color="#0000BB">maxdb_free_result</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">maxdb_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
><P
> The above examples would produce the following output:
</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>Name: NAME
Table:
max. Len: 10
Flags: -1
Type: 2
Name: CNO
Table:
max. Len: 4
Flags: -1
Type: 0</PRE
></TD
></TR
></TABLE
></DIV
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><HR
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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.maxdb-fetch-field-direct.html"
ACCESSKEY="P"
>上一页</A
></TD
><TD
WIDTH="34%"
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><A
HREF="index.html"
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>起始页</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.maxdb-fetch-fields.html"
ACCESSKEY="N"
>下一页</A
></TD
></TR
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><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>maxdb_fetch_field_direct</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ref.maxdb.html"
ACCESSKEY="U"
>上一级</A
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>maxdb_fetch_fields</TD
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