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185 lines
7.7 KiB
HTML
185 lines
7.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Execute a query that does not prefetch and buffer all data</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.sqlite-unbuffered-query" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">sqlite_unbuffered_query</h1>
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<h1 class="refname">SQLiteDatabase::unbufferedQuery</h1>
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<p class="verinfo">(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0)</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>
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</div>
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<div class="refsect1 description" id="refsect1-function.sqlite-unbuffered-query-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>sqlite_unbuffered_query</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$dbhandle</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$result_type</code><span class="initializer"> = SQLITE_BOTH</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter reference">&$error_msg</code></span>
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]] ) : <span class="type">resource</span></div>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>sqlite_unbuffered_query</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$dbhandle</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$result_type</code><span class="initializer"> = SQLITE_BOTH</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter reference">&$error_msg</code></span>
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]] ) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">面向对象风格 (method):</p>
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<div class="methodsynopsis dc-description">
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<span class="modifier">public</span> <span class="methodname"><strong>SQLiteDatabase::unbufferedQuery</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$result_type</code><span class="initializer"> = SQLITE_BOTH</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter reference">&$error_msg</code></span>
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]] ) : <span class="type"><span class="type SQLiteUnbuffered">SQLiteUnbuffered</span></span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>sqlite_unbuffered_query()</strong></span> is identical to
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<span class="function"><a href="sqlite_query.html" class="function">sqlite_query()</a></span> except that the result that is returned
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is a sequential forward-only result set that can only be used to read
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each row, one after the other.
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</p>
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<p class="para">
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This function is ideal for generating things such as HTML tables where
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you only need to process one row at a time and don't need to randomly
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access the row data.
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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Functions such as <span class="function"><a href="sqlite_seek.html" class="function">sqlite_seek()</a></span>,
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<span class="function"><a href="sqlite_rewind.html" class="function">sqlite_rewind()</a></span>, <span class="function"><a href="sqlite_next.html" class="function">sqlite_next()</a></span>,
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<span class="function"><a href="sqlite_current.html" class="function">sqlite_current()</a></span>, and
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<span class="function"><a href="sqlite_num_rows.html" class="function">sqlite_num_rows()</a></span> do not work on result handles
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returned from <span class="function"><strong>sqlite_unbuffered_query()</strong></span>.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.sqlite-unbuffered-query-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">dbhandle</code></dt>
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<dd>
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<p class="para">
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The SQLite Database resource; returned from
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<span class="function"><a href="sqlite_open.html" class="function">sqlite_open()</a></span> when used procedurally. This parameter
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is not required when using the object-oriented method.
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</p>
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</dd>
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<dt>
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<code class="parameter">query</code></dt>
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<dd>
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<p class="para">
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The query to be executed.
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</p>
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<p class="para">
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Data inside the query should be <a href="sqlite_escape_string.html" class="link">properly escaped</a>.
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</p>
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</dd>
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<dt>
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<code class="parameter">result_type</code></dt>
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<dd>
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<p class="para">可选的 <code class="parameter">result_type</code>
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参数接受常量，且决定返回的数组如何被索引。使用
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<strong><code>SQLITE_ASSOC</code></strong> 会仅返回关联索引（已命名字段），而
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<strong><code>SQLITE_NUM</code></strong> 会仅返回数值索引。<strong><code>SQLITE_BOTH</code></strong>
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会同时返回关联和数值索引。<strong><code>SQLITE_BOTH</code></strong> 是此函数的默认值。</p>
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</dd>
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<dt>
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<code class="parameter">error_msg</code></dt>
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<dd>
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<p class="para">
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The specified variable will be filled if an error occurs. This is
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specially important because SQL syntax errors can't be fetched using
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the <span class="function"><a href="sqlite_last_error.html" class="function">sqlite_last_error()</a></span> function.
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</p>
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</dd>
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</dl>
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">为兼容其他数据库扩展(比如 MySQL)，支持两种可替代的语法。推荐第一种格式，函数的第一个参数是<code class="parameter">dbhandle</code>。</span></p></blockquote>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.sqlite-unbuffered-query-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns a result handle 或者在失败时返回 <strong><code>FALSE</code></strong>.
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</p>
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<p class="para">
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<span class="function"><strong>sqlite_unbuffered_query()</strong></span> returns a sequential
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forward-only result set that can only be used to read each row, one after
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the other.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.sqlite-unbuffered-query-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.1.0</td>
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<td>
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Added the <code class="parameter">error_msg</code> parameter
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.sqlite-unbuffered-query-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="sqlite_query.html" class="function" rel="rdfs-seeAlso">sqlite_query()</a> - Executes a query against a given database and returns a result handle</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |