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125 lines
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<!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>Prepare an SQL statement for execution</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.maxdb-prepare" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">maxdb_prepare</h1>
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<h1 class="refname">maxdb::prepare</h1>
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<p class="verinfo">(PECL maxdb >= 1.0)</p><p class="refpurpose"><span class="refname">maxdb_prepare</span> -- <span class="refname">maxdb::prepare</span> — <span class="dc-title">Prepare an SQL statement for execution</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.maxdb-prepare-description">
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<h3 class="title">说明</h3>
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<p class="para">过程化风格</p>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>maxdb_prepare</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">面向对象风格</p>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>maxdb::prepare</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="type"><span class="type maxdb_stmt">maxdb_stmt</span></span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>maxdb_prepare()</strong></span> prepares the SQL query pointed to by the
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null-terminated string query, and returns a statement handle to be used for
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further operations on the statement. The query must consist of a single SQL statement.
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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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You should not add a terminating semicolon or <em>\g</em>
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to the statement.
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</p>
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</p></blockquote>
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<p class="para">
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The parameter <code class="parameter">query</code> can include one or more parameter markers
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in the SQL statement by embedding question mark (<em>?</em>) characters
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at the appropriate positions.
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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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The markers are legal only in certain places in SQL statements.
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For example, they are allowed in the VALUES() list of an INSERT statement
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(to specify column values for a row), or in a comparison with a column in
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a WHERE clause to specify a comparison value.
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</p>
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<p class="para">
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However, they are not allowed for identifiers (such as table or column names),
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in the select list that names the columns to be returned by a SELECT statement),
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or to specify both operands of a binary operator such as the <em>=</em>
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equal sign. The latter restriction is necessary because it would be impossible
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to determine the parameter type. In general, parameters are legal only in Data
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Manipulation Languange (DML) statements, and not in Data Defination Language
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(DDL) statements.
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</p>
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</p></blockquote>
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<p class="para">
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The parameter markers must be bound to application variables using
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<span class="function"><a href="maxdb_stmt_bind_param.html" class="function">maxdb_stmt_bind_param()</a></span> and/or <span class="function"><a href="maxdb_stmt_bind_result.html" class="function">maxdb_stmt_bind_result()</a></span>
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before executing the statement or fetching rows.
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.maxdb-prepare-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<span class="function"><strong>maxdb_prepare()</strong></span> returns a statement resource or <strong><code>FALSE</code></strong> if an error occurred.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.maxdb-prepare-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-1389">
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<p><strong>Example #1 面向对象风格</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 />$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">$city </span><span style="color: #007700">= </span><span style="color: #DD0000">"Rosemont"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* create a prepared statement */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">prepare</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT state FROM hotel.city WHERE name=?"</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #FF8000">/* bind parameters for markers */<br /> </span><span style="color: #0000BB">$stmt</span><span style="color: #007700">-></span><span style="color: #0000BB">bind_param</span><span style="color: #007700">(</span><span style="color: #DD0000">"s"</span><span style="color: #007700">, </span><span style="color: #0000BB">$city</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* execute query */<br /> </span><span style="color: #0000BB">$stmt</span><span style="color: #007700">-></span><span style="color: #0000BB">execute</span><span style="color: #007700">();<br /><br /> </span><span style="color: #FF8000">/* bind result variables */<br /> </span><span style="color: #0000BB">$stmt</span><span style="color: #007700">-></span><span style="color: #0000BB">bind_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$district</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* fetch value */<br /> </span><span style="color: #0000BB">$stmt</span><span style="color: #007700">-></span><span style="color: #0000BB">fetch</span><span style="color: #007700">();<br /><br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"%s is in district %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$city</span><span style="color: #007700">, </span><span style="color: #0000BB">$district</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* close statement */<br /> </span><span style="color: #0000BB">$stmt</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">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-1390">
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<p><strong>Example #2 过程化风格</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$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">$city </span><span style="color: #007700">= </span><span style="color: #DD0000">"Rosemont"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* create a prepared statement */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_prepare</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT state FROM hotel.city WHERE name=?"</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #FF8000">/* bind parameters for markers */<br /> </span><span style="color: #0000BB">maxdb_stmt_bind_param</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">, </span><span style="color: #DD0000">"s"</span><span style="color: #007700">, </span><span style="color: #0000BB">$city</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* execute query */<br /> </span><span style="color: #0000BB">maxdb_stmt_execute</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* bind result variables */<br /> </span><span style="color: #0000BB">maxdb_stmt_bind_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">, </span><span style="color: #0000BB">$district</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* fetch value */<br /> </span><span style="color: #0000BB">maxdb_stmt_fetch</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"%s is in district %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$city</span><span style="color: #007700">, </span><span style="color: #0000BB">$district</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* close statement */<br /> </span><span style="color: #0000BB">maxdb_stmt_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</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>
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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 class="para">以上例程的输出类似于：</p>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Rosemont is in district IL
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</pre></div>
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</div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.maxdb-prepare-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="maxdb_stmt_execute.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_execute()</a> - Executes a prepared Query</span></li>
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<li class="member"><span class="function"><a href="maxdb_stmt_fetch.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_fetch()</a> - Fetch results from a prepared statement into the bound variables</span></li>
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<li class="member"><span class="function"><a href="maxdb_stmt_bind_param.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_bind_param()</a> - Binds variables to a prepared statement as parameters</span></li>
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<li class="member"><span class="function"><a href="maxdb_stmt_bind_result.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_bind_result()</a> - Binds variables to a prepared statement for result storage</span></li>
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<li class="member"><span class="function"><a href="maxdb_stmt_close.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_close()</a> - Closes a prepared statement</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> |