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><H1
><A
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>maxdb_prepare</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN111944"
></A
><P
>    (PECL)</P
>maxdb_prepare<P
>    (no version information, might be only in CVS)</P
>maxdb-&#62;prepare&nbsp;--&nbsp;Prepare a SQL statement for execution</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111948"
></A
><H2
>Description</H2
><P
>Procedure style:</P
>resource <B
CLASS="methodname"
>maxdb_prepare</B
> ( resource link, string query )<BR
></BR
><P
>Object oriented style (method)</P
>class <B
CLASS="classname"
>stmt</B
> { <BR
></BR
>resource <B
CLASS="methodname"
>prepare</B
> ( string query )<BR
></BR
>}<P
>&#13;   <B
CLASS="function"
>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
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    You should not add a terminating semicolon or <TT
CLASS="literal"
>\g</TT
>
    to the statement.
   </P
></BLOCKQUOTE
></DIV
><P
>&#13;   The parameter <CODE
CLASS="parameter"
>query</CODE
>  can include one or more parameter markers
   in the SQL statement by embedding question mark (<TT
CLASS="literal"
>?</TT
>) characters
   at the appropriate positions.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </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.
   </P
><P
>&#13;    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 <TT
CLASS="literal"
>=</TT
>
    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.
   </P
></BLOCKQUOTE
></DIV
><P
>&#13;   The parameter markers must be bound to application variables using
   <A
HREF="function.maxdb-stmt-bind-param.html"
><B
CLASS="function"
>maxdb_stmt_bind_param()</B
></A
> and/or <A
HREF="function.maxdb-stmt-bind-result.html"
><B
CLASS="function"
>maxdb_stmt_bind_result()</B
></A
>
   before executing the statement or fetching rows.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111985"
></A
><H2
>返回值</H2
><P
>&#13;   <B
CLASS="function"
>maxdb_prepare()</B
> returns a statement resource or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if an error occured.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111990"
></A
><H2
>参见</H2
><P
>&#13;   <A
HREF="function.maxdb-stmt-execute.html"
><B
CLASS="function"
>maxdb_stmt_execute()</B
></A
>,
   <A
HREF="function.maxdb-stmt-fetch.html"
><B
CLASS="function"
>maxdb_stmt_fetch()</B
></A
>,
   <A
HREF="function.maxdb-stmt-bind-param.html"
><B
CLASS="function"
>maxdb_stmt_bind_param()</B
></A
>,
   <A
HREF="function.maxdb-stmt-bind-result.html"
><B
CLASS="function"
>maxdb_stmt_bind_result()</B
></A
>,
   <A
HREF="function.maxdb-stmt-close.html"
><B
CLASS="function"
>maxdb_stmt_close()</B
></A
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111998"
></A
><H2
>Example</H2
><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN112000"
></A
><P
><B
>例 1. Object oriented style</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$maxdb </font><font color="#007700">= new </font><font color="#0000BB">maxdb</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"MONA"</font><font color="#007700">, </font><font color="#DD0000">"RED"</font><font color="#007700">, </font><font color="#DD0000">"DEMODB"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">maxdb_connect_errno</font><font color="#007700">()) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">maxdb_connect_error</font><font color="#007700">());<br />&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></font><font color="#0000BB">$city </font><font color="#007700">= </font><font color="#DD0000">"Rosemont"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* create a prepared statement */<br /></font><font color="#007700">if (</font><font color="#0000BB">$stmt </font><font color="#007700">= </font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">prepare</font><font color="#007700">(</font><font color="#DD0000">"SELECT state FROM hotel.city WHERE name=?"</font><font color="#007700">)) {<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* bind parameters for markers */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">bind_param</font><font color="#007700">(</font><font color="#DD0000">"s"</font><font color="#007700">, </font><font color="#0000BB">$city</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* execute query */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">execute</font><font color="#007700">();<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* bind result variables */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">bind_result</font><font color="#007700">(</font><font color="#0000BB">$district</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* fetch value */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">fetch</font><font color="#007700">();<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"%s is in district %s\n"</font><font color="#007700">, </font><font color="#0000BB">$city</font><font color="#007700">, </font><font color="#0000BB">$district</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* close statement */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">$maxdb</font><font color="#007700">-&gt;</font><font color="#0000BB">close</font><font color="#007700">();<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN112003"
></A
><P
><B
>例 2. Procedural style</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$link </font><font color="#007700">= </font><font color="#0000BB">maxdb_connect</font><font color="#007700">(</font><font color="#DD0000">"localhost"</font><font color="#007700">, </font><font color="#DD0000">"MONA"</font><font color="#007700">, </font><font color="#DD0000">"RED"</font><font color="#007700">, </font><font color="#DD0000">"DEMODB"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* check connection */<br /></font><font color="#007700">if (</font><font color="#0000BB">maxdb_connect_errno</font><font color="#007700">()) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"Connect failed: %s\n"</font><font color="#007700">, </font><font color="#0000BB">maxdb_connect_error</font><font color="#007700">());<br />&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></font><font color="#0000BB">$city </font><font color="#007700">= </font><font color="#DD0000">"Rosemont"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* create a prepared statement */<br /></font><font color="#007700">if (</font><font color="#0000BB">$stmt </font><font color="#007700">= </font><font color="#0000BB">maxdb_prepare</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">, </font><font color="#DD0000">"SELECT state FROM hotel.city WHERE name=?"</font><font color="#007700">)) {<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* bind parameters for markers */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">maxdb_stmt_bind_param</font><font color="#007700">(</font><font color="#0000BB">$stmt</font><font color="#007700">, </font><font color="#DD0000">"s"</font><font color="#007700">, </font><font color="#0000BB">$city</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* execute query */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">maxdb_stmt_execute</font><font color="#007700">(</font><font color="#0000BB">$stmt</font><font color="#007700">);<br /><br />&nbsp;&nbsp;</font><font color="#FF8000">/* bind result variables */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">maxdb_stmt_bind_result</font><font color="#007700">(</font><font color="#0000BB">$stmt</font><font color="#007700">, </font><font color="#0000BB">$district</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* fetch value */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">maxdb_stmt_fetch</font><font color="#007700">(</font><font color="#0000BB">$stmt</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">printf</font><font color="#007700">(</font><font color="#DD0000">"%s is in district %s\n"</font><font color="#007700">, </font><font color="#0000BB">$city</font><font color="#007700">, </font><font color="#0000BB">$district</font><font color="#007700">);<br /><br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* close statement */<br />&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">maxdb_stmt_close</font><font color="#007700">(</font><font color="#0000BB">$stmt</font><font color="#007700">);<br />}<br /><br /></font><font color="#FF8000">/* close connection */<br /></font><font color="#0000BB">maxdb_close</font><font color="#007700">(</font><font color="#0000BB">$link</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
><P
>&#13;   The above examples would produce the following output:
  </P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>Rosemont is in district IL</PRE
></TD
></TR
></TABLE
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