function.maxdb-field-seek.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Set result pointer to a specified field offset</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.maxdb-field-count.html">maxdb_field_count</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.maxdb-field-tell.html">maxdb_field_tell</a></div> <div class="up"><a href="ref.maxdb.html">MaxDB Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.maxdb-field-seek" class="refentry"> <div class="refnamediv"> <h1 class="refname">maxdb_field_seek</h1> <h1 class="refname">result->field_seek</h1> <p class="verinfo">(PECL maxdb:1.0-7.6.00.38)</p><p class="refpurpose"><span class="refname">maxdb_field_seek</span> -- <span class="refname">result->field_seek</span> — <span class="dc-title">Set result pointer to a specified field offset</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <p class="para">Procedural style:</p> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>maxdb_field_seek</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$result</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$fieldnr</tt></span> )</div> <p class="para rdfs-comment">Object oriented style (method):</p> <div class="classsynopsis"> <div class="ooclass"><b class="classname">result</b></div> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>field_seek</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$fieldnr</tt></span> )</div> </div> <p class="para"> Sets the field cursor to the given offset. The next call to <a href="function.maxdb-fetch-field.html" class="function">maxdb_fetch_field()</a> will retrieve the field definition of the column associated with that offset. </p> <blockquote><p><b class="note">Note</b>: To seek to the beginning of a row, pass an offset value of zero.<br /> </p></blockquote> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <b>maxdb_field_seek()</b> returns previuos value of field cursor. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <div class="example"> <p><b>Example #1 Object oriented style</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$maxdb </span><span style="color: #007700">= new </span><span style="color: #0000BB">maxdb</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #0000BB">$query </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT name, cno from hotel.customer ORDER BY cno"</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #FF8000">/* Get field information for 2nd column */<br /> </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">field_seek</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$finfo </span><span style="color: #007700">= </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">fetch_field</span><span style="color: #007700">();<br /><br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Name: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">name</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Table: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">table</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"max. Len: %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">max_length</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Flags: %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">flags</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Type: %d\n\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">type</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <div class="example"> <p><b>Example #2 Procedural style</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #0000BB">$query </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT name, cno from hotel.customer ORDER BY cno"</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #0000BB">$query</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #FF8000">/* Get field information for 2nd column */<br /> </span><span style="color: #0000BB">maxdb_field_seek</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$finfo </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_fetch_field</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Name: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">name</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Table: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">table</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"max. Len: %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">max_length</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Flags: %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">flags</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Type: %d\n\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">type</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">maxdb_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">maxdb_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <p class="para">The above example will output something similar to:</p> <div class="example-contents"><pre><div class="cdata"><pre>Name: NAMETable:max. Len: 10Flags: -1Type: 2</pre></div> </pre></div> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.maxdb-fetch-field.html" class="function" rel="rdfs-seeAlso">maxdb_fetch_field()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.maxdb-field-count.html">maxdb_field_count</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.maxdb-field-tell.html">maxdb_field_tell</a></div> <div class="up"><a href="ref.maxdb.html">MaxDB Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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