function.mssql-field-length.html
来自「php的帮助文档,涉及到PHP的案例和基本语法,以及实际应用内容」· HTML 代码 · 共 139 行
HTML
139 行
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Get the length of a field</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.mssql-fetch-row.html">mssql_fetch_row</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mssql-field-name.html">mssql_field_name</a></div> <div class="up"><a href="ref.mssql.html">Mssql Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.mssql-field-length" class="refentry"> <div class="refnamediv"> <h1 class="refname">mssql_field_length</h1> <p class="verinfo">(PHP 4, PHP 5, PECL odbtp:1.1.1-1.1.4)</p><p class="refpurpose"><span class="refname">mssql_field_length</span> — <span class="dc-title">Get the length of a field</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>mssql_field_length</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$result</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$offset</tt></span> ] )</div> <p class="para rdfs-comment"> Returns the length of field no. <i><tt class="parameter">offset</tt></i> in <i><tt class="parameter">result</tt></i>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">result</tt></i></span> <dd> <p class="para"> The result resource that is being evaluated. This result comes from a call to <a href="function.mssql-query.html" class="function">mssql_query()</a>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">offset</tt></i></span> <dd> <p class="para"> The field offset, starts at 0. If omitted, the current field is used. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> The length of the specified field index on success, or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>mssql_field_length()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Connect MSSQL<br /></span><span style="color: #0000BB">mssql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'MANGO\SQLEXPRESS'</span><span style="color: #007700">, </span><span style="color: #DD0000">'sa'</span><span style="color: #007700">, </span><span style="color: #DD0000">'phpfi'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mssql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">'php'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Send a select query to MSSQL<br /></span><span style="color: #0000BB">$query </span><span style="color: #007700">= </span><span style="color: #0000BB">mssql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">'SELECT [name], [age] FROM [php].[dbo].[persons]'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Print the field type and length<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">'The field \'age\' has a data length of ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mssql_field_length</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Free the query result<br /></span><span style="color: #0000BB">mssql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>The field 'age' has a data length of 4</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <b>Note to Windows Users</b><br /> Due to a limitation in the underlying API used by PHP (MS DBLib C API), the length of <i>VARCHAR</i> fields is limited to <em class="emphasis">255</em>. If you need to store more data, use a <i>TEXT</i> field instead. <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.mssql-field-name.html" class="function" rel="rdfs-seeAlso">mssql_field_name()</a></li> <li class="member"><a href="function.mssql-field-type.html" class="function" rel="rdfs-seeAlso">mssql_field_type()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.mssql-fetch-row.html">mssql_fetch_row</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mssql-field-name.html">mssql_field_name</a></div> <div class="up"><a href="ref.mssql.html">Mssql Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?