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155 lines
8.7 KiB
HTML
155 lines
8.7 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>Submits a command to the server and waits for the result, with the ability to pass parameters separately from the SQL command text</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.pg-query-params" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_query_params</h1>
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<p class="verinfo">(PHP 5 >= 5.1.0, PHP 7)</p><p class="refpurpose"><span class="refname">pg_query_params</span> — <span class="dc-title">Submits a command to the server and waits for the result, with the ability to pass parameters separately from the SQL command text</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.pg-query-params-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>pg_query_params</strong></span>
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([ <span class="methodparam"><span class="type">resource</span> <code class="parameter">$connection</code></span>
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], <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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, <span class="methodparam"><span class="type">array</span> <code class="parameter">$params</code></span>
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) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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Submits a command to the server and waits for the result, with the ability
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to pass parameters separately from the SQL command text.
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</p>
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<p class="para">
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<span class="function"><strong>pg_query_params()</strong></span> is like <span class="function"><a href="pg_query.html" class="function">pg_query()</a></span>,
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but offers additional functionality: parameter
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values can be specified separately from the command string proper.
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<span class="function"><strong>pg_query_params()</strong></span> is supported only against PostgreSQL 7.4 or
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higher connections; it will fail when using earlier versions.
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</p>
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<p class="para">
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If parameters are used, they are referred to in the
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<code class="parameter">query</code> string as $1, $2, etc. The same parameter may
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appear more than once in the <code class="parameter">query</code>; the same value
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will be used in that case. <code class="parameter">params</code> specifies the
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actual values of the parameters. A <strong><code>NULL</code></strong> value in this array means the
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corresponding parameter is SQL <em>NULL</em>.
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</p>
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<p class="para">
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The primary advantage of <span class="function"><strong>pg_query_params()</strong></span> over <span class="function"><a href="pg_query.html" class="function">pg_query()</a></span>
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is that parameter values
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may be separated from the <code class="parameter">query</code> string, thus avoiding the need for tedious
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and error-prone quoting and escaping. Unlike <span class="function"><a href="pg_query.html" class="function">pg_query()</a></span>,
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<span class="function"><strong>pg_query_params()</strong></span> allows at
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most one SQL command in the given string. (There can be semicolons in it,
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but not more than one nonempty command.)
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.pg-query-params-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">connection</code></dt>
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<dd>
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<p class="para">
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PostgreSQL database connection resource. When
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<code class="parameter">connection</code> is not present, the default connection
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is used. The default connection is the last connection made by
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<span class="function"><a href="pg_connect.html" class="function">pg_connect()</a></span> or <span class="function"><a href="pg_pconnect.html" class="function">pg_pconnect()</a></span>.
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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 parameterized SQL statement. Must contain only a single statement.
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(multiple statements separated by semi-colons are not allowed.) If any parameters
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are used, they are referred to as $1, $2, etc.
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</p>
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<p class="para">
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User-supplied values should always be passed as parameters, not
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interpolated into the query string, where they form possible
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<a href="security.database.sql_injection.html" class="link"> SQL injection</a>
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attack vectors and introduce bugs when handling data containing quotes.
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If for some reason you cannot use a parameter, ensure that interpolated
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values are <a href="pg_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">params</code></dt>
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<dd>
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<p class="para">
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An array of parameter values to substitute for the $1, $2, etc. placeholders
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in the original prepared query string. The number of elements in the array
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must match the number of placeholders.
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</p>
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<p class="para">
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Values intended for <em>bytea</em> fields are not supported as
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parameters. Use <span class="function"><a href="pg_escape_bytea.html" class="function">pg_escape_bytea()</a></span> instead, or use the
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large object functions.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.pg-query-params-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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A query result resource on success 或者在失败时返回 <strong><code>FALSE</code></strong>.</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.pg-query-params-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-2512">
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<p><strong>Example #1 Using <span class="function"><strong>pg_query_params()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Connect to a database named "mary"<br /></span><span style="color: #0000BB">$dbconn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=mary"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Find all shops named Joe's Widgets. Note that it is not necessary to<br />// escape "Joe's Widgets"<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_query_params</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">, </span><span style="color: #DD0000">'SELECT * FROM shops WHERE name = $1'</span><span style="color: #007700">, array(</span><span style="color: #DD0000">"Joe's Widgets"</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// Compare against just using pg_query<br /></span><span style="color: #0000BB">$str </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_escape_string</span><span style="color: #007700">(</span><span style="color: #DD0000">"Joe's Widgets"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT * FROM shops WHERE name = '</span><span style="color: #007700">{</span><span style="color: #0000BB">$str</span><span style="color: #007700">}</span><span style="color: #DD0000">'"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.pg-query-params-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="pg_query.html" class="function" rel="rdfs-seeAlso">pg_query()</a> - 执行查询</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> |