📄 function.sqlite-unbuffered-query.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>Execute a query that does not prefetch and buffer all data</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.sqlite-udf-encode-binary.html">sqlite_udf_encode_binary</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.sqlite-valid.html">sqlite_valid</a></div> <div class="up"><a href="ref.sqlite.html">SQLite Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.sqlite-unbuffered-query" class="refentry"> <div class="refnamediv"> <h1 class="refname">sqlite_unbuffered_query</h1> <h1 class="refname">SQLiteDatabase->unbufferedQuery</h1> <p class="verinfo">(PHP 5, PECL sqlite:1.0-1.0.3)</p><p class="refpurpose"><span class="refname">sqlite_unbuffered_query</span> -- <span class="refname">SQLiteDatabase->unbufferedQuery</span> — <span class="dc-title">Execute a query that does not prefetch and buffer all data</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>sqlite_unbuffered_query</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$dbhandle</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$query</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$result_type</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter reference">&$error_msg</tt></span> ]] )</div> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>sqlite_unbuffered_query</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$query</tt></span> , <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$dbhandle</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$result_type</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter reference">&$error_msg</tt></span> ]] )</div> <p class="para rdfs-comment">Object oriented style (method):</p> <div class="classsynopsis"> <div class="ooclass"><b class="classname">SQLiteDatabase</b></div> <div class="methodsynopsis dc-description"> <span class="type">SQLiteUnbuffered</span> <span class="methodname"><b><b>unbufferedQuery</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$query</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$result_type</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter reference">&$error_msg</tt></span> ]] )</div> </div> <p class="para"> <b>sqlite_unbuffered_query()</b> is identical to <a href="function.sqlite-query.html" class="function">sqlite_query()</a> except that the result that is returned is a sequential forward-only result set that can only be used to read each row, one after the other. </p> <p class="para"> This function is ideal for generating things such as HTML tables where you only need to process one row at a time and don't need to randomly access the row data. </p> <blockquote><p><b class="note">Note</b>: Functions such as <a href="function.sqlite-seek.html" class="function">sqlite_seek()</a>, <a href="function.sqlite-rewind.html" class="function">sqlite_rewind()</a>, <a href="function.sqlite-next.html" class="function">sqlite_next()</a>, <a href="function.sqlite-current.html" class="function">sqlite_current()</a>, and <a href="function.sqlite-num-rows.html" class="function">sqlite_num_rows()</a> do not work on result handles returned from <b>sqlite_unbuffered_query()</b>. <br /> </p></blockquote> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">dbhandle</tt></i></span> <dd> <p class="para"> The SQLite Database resource; returned from <a href="function.sqlite-open.html" class="function">sqlite_open()</a> when used procedurally. This parameter is not required when using the object-oriented method. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">query</tt></i></span> <dd> <p class="para"> The query to be executed. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">result_type</tt></i></span> <dd> <p class="para">The optional <i><tt class="parameter">result_type</tt></i>parameter accepts a constant and determines how the returned array will beindexed. Using <b><tt>SQLITE_ASSOC</tt></b> will return only associativeindices (named fields) while <b><tt>SQLITE_NUM</tt></b> will returnonly numerical indices (ordinal field numbers). <b><tt>SQLITE_BOTH</tt></b>will return both associative and numerical indices.<b><tt>SQLITE_BOTH</tt></b> is the default for this function.</p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">error_msg</tt></i></span> <dd> <p class="para"> The specified variable will be filled if an error occurs. This is specially important because SQL syntax errors can't be fetched using the <a href="function.sqlite-last-error.html" class="function">sqlite_last_error()</a> function. </p> </dd> </dt> </dl> </p> <blockquote><p><b class="note">Note</b>: <span class="simpara">Two alternative syntaxes aresupported for compatibility with other database extensions (such as MySQL).The preferred form is the first, where the <i><tt class="parameter">dbhandle</tt></i>parameter is the first parameter to the function.</span></p></blockquote> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a result handle or <b><tt>FALSE</tt></b> on failure. </p> <p class="para"> <b>sqlite_unbuffered_query()</b> returns a sequential forward-only result set that can only be used to read each row, one after the other. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5.1.0</td> <td colspan="1" rowspan="1" align="left"> Added the <i><tt class="parameter">error_msg</tt></i> parameter </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.sqlite-query.html" class="function" rel="rdfs-seeAlso">sqlite_query()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.sqlite-udf-encode-binary.html">sqlite_udf_encode_binary</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.sqlite-valid.html">sqlite_valid</a></div> <div class="up"><a href="ref.sqlite.html">SQLite 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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