📄 function.maxdb-prepare.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>Prepare a SQL statement for execution</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.maxdb-ping.html">maxdb_ping</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.maxdb-query.html">maxdb_query</a></div> <div class="up"><a href="ref.maxdb.html">MaxDB Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.maxdb-prepare" class="refentry"> <div class="refnamediv"> <h1 class="refname">maxdb_prepare</h1> <h1 class="refname">maxdb->prepare</h1> <p class="verinfo">(PECL maxdb:1.0-7.6.00.38)</p><p class="refpurpose"><span class="refname">maxdb_prepare</span> -- <span class="refname">maxdb->prepare</span> — <span class="dc-title">Prepare a SQL statement for execution</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <p class="para">Procedure style:</p> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>maxdb_prepare</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$link</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$query</tt></span> )</div> <p class="para rdfs-comment">Object oriented style (method)</p> <div class="classsynopsis"> <div class="ooclass"><b class="classname">stmt</b></div> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>prepare</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$query</tt></span> )</div> </div> <p class="para"> <b>maxdb_prepare()</b> prepares the SQL query pointed to by the null-terminated string query, and returns a statement handle to be used for further operations on the statement. The query must consist of a single SQL statement. </p> <blockquote><p><b class="note">Note</b>: You should not add a terminating semicolon or <i>\g</i> to the statement. <br /> </p></blockquote> <p class="para"> The parameter <i><tt class="parameter">query</tt></i> can include one or more parameter markers in the SQL statement by embedding question mark (<i>?</i>) characters at the appropriate positions. </p> <blockquote><p><b class="note">Note</b>: The markers are legal only in certain places in SQL statements. For example, they are allowed in the VALUES() list of an INSERT statement (to specify column values for a row), or in a comparison with a column in a WHERE clause to specify a comparison value. <br /> However, they are not allowed for identifiers (such as table or column names), in the select list that names the columns to be returned by a SELECT statement), or to specify both operands of a binary operator such as the <i>=</i> equal sign. The latter restriction is necessary because it would be impossible to determine the parameter type. In general, parameters are legal only in Data Manipulation Languange (DML) statements, and not in Data Defination Language (DDL) statements. <br /> </p></blockquote> <p class="para"> The parameter markers must be bound to application variables using <a href="function.maxdb-stmt-bind-param.html" class="function">maxdb_stmt_bind_param()</a> and/or <a href="function.maxdb-stmt-bind-result.html" class="function">maxdb_stmt_bind_result()</a> before executing the statement or fetching rows. </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <b>maxdb_prepare()</b> returns a statement resource or <b><tt>FALSE</tt></b> if an error occured. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <div class="example"> <p><b>Example #1 Object oriented style</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><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">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <div class="example"> <p><b>Example #2 Procedural style</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$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></span></code></div> </div> </div> <p class="para">The above example will output something similar to:</p> <div class="example-contents"><pre><div class="cdata"><pre>Rosemont is in district IL</pre></div> </pre></div> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.maxdb-stmt-execute.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_execute()</a></li> <li class="member"><a href="function.maxdb-stmt-fetch.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_fetch()</a></li> <li class="member"><a href="function.maxdb-stmt-bind-param.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_bind_param()</a></li> <li class="member"><a href="function.maxdb-stmt-bind-result.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_bind_result()</a></li> <li class="member"><a href="function.maxdb-stmt-close.html" class="function" rel="rdfs-seeAlso">maxdb_stmt_close()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.maxdb-ping.html">maxdb_ping</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.maxdb-query.html">maxdb_query</a></div> <div 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