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>mysqli_fetch_field</TITLE
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>PHP 手册</TH
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><H1
><A
NAME="function.mysqli-fetch-field"
></A
>mysqli_fetch_field</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN138745"
></A
><P
> (PHP 5)</P
>mysqli_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="AEN138749"
></A
><H2
>说明</H2
><P
>Procedural style:</P
>object <B
CLASS="methodname"
>mysqli_fetch_field</B
> ( mysqli_result result )<BR
></BR
><P
>Object oriented style (method):</P
>class <B
CLASS="classname"
>mysqli_result</B
> { <BR
></BR
>object <B
CLASS="methodname"
>fetch_field</B
> ( void )<BR
></BR
>}<P
> Returns the definition of one column of a result set as an object. Call
this function repeatedly to retrieve information about all columns in the
result set.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138767"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
> result</CODE
></DT
><DD
><P
>Procedural style only: A result set
identifier returned by <A
HREF="function.mysqli-query.html"
><B
CLASS="function"
>mysqli_query()</B
></A
>, <A
HREF="function.mysqli-store-result.html"
><B
CLASS="function"
>mysqli_store_result()</B
></A
>
or <A
HREF="function.mysqli-use-result.html"
><B
CLASS="function"
>mysqli_use_result()</B
></A
>.</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138779"
></A
><H2
>返回值</H2
><P
> Returns an object which contains field definition information or <TT
CLASS="constant"
><B
>FALSE</B
></TT
>
if no field information is available.
</P
><P
> <DIV
CLASS="table"
><A
NAME="AEN138784"
></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
>orgname</TD
><TD
>Original column name if an alias was specified</TD
></TR
><TR
><TD
>table</TD
><TD
>The name of the table this field belongs to (if not calculated)</TD
></TR
><TR
><TD
>orgtable</TD
><TD
>Original table name if an alias was specified</TD
></TR
><TR
><TD
>def</TD
><TD
>The default value for this field, represented as a string</TD
></TR
><TR
><TD
>max_length</TD
><TD
>The maximum width of the field for the result set.</TD
></TR
><TR
><TD
>length</TD
><TD
>The width of the field, as specified in the table definition.</TD
></TR
><TR
><TD
>charsetnr</TD
><TD
>The character set number for the field.</TD
></TR
><TR
><TD
>flags</TD
><TD
>An integer representing the bit-flags for the field.</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="AEN138825"
></A
><H2
>范例</H2
><TABLE
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BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN138827"
></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 />$mysqli </font><font color="#007700">= new </font><font color="#0000BB">mysqli</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">mysqli_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">"SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5"</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="#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">$result</font><font color="#007700">-></font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$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="AEN138830"
></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 />$link </font><font color="#007700">= </font><font color="#0000BB">mysqli_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"my_user"</font><font color="#007700">, </font><font color="#DD0000">"my_password"</font><font color="#007700">, </font><font color="#DD0000">"world"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">mysqli_connect_errno</font><font color="#007700">()) {<br /> </font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">mysqli_connect_error</font><font color="#007700">());<br /> exit();<br />}<br /><br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">"SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5"</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="#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">mysqli_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">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
>上例将输出：</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>Name: Name
Table: Country
max. Len: 11
Flags: 1
Type: 254
Name: SurfaceArea
Table: Country
max. Len: 10
Flags: 32769
Type: 4</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN138835"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.mysqli-num-fields.html"
><B
CLASS="function"
>mysqli_num_fields()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mysqli-fetch-field-direct.html"
><B
CLASS="function"
>mysqli_fetch_field_direct()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mysqli-fetch-fields.html"
><B
CLASS="function"
>mysqli_fetch_fields()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.mysqli-field-seek.html"
><B
CLASS="function"
>mysqli_field_seek()</B
></A
></TD
></TR
></TBODY
></TABLE
><P
></P
>
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