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><H1
><A
NAME="function.db2-prepare"
></A
>db2_prepare</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN82084"
></A
><P
>    (PECL)</P
>db2_prepare&nbsp;--&nbsp;
   Prepares an SQL statement to be executed
  </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN82087"
></A
><H2
>说明</H2
>resource <B
CLASS="methodname"
>db2_prepare</B
> ( resource connection, string statement [, array options] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>db2_prepare()</B
> creates a prepared SQL statement which can
   include 0 or more parameter markers (<TT
CLASS="literal"
>?</TT
> characters)
   representing parameters for input, output, or input/output. You can pass
   parameters to the prepared statement using
   <A
HREF="function.db2-bind-param.html"
><B
CLASS="function"
>db2_bind_param()</B
></A
>, or for input values only, as an array
   passed to <A
HREF="function.db2-execute.html"
><B
CLASS="function"
>db2_execute()</B
></A
>.
  </P
><P
>&#13;   There are three main advantages to using prepared statements in your
   application:
   <P
></P
><UL
><LI
><P
>&#13;      <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Performance</I
></SPAN
>: when you prepare a statement, the
      database server creates an optimized access plan for retrieving data with
      that statement. Subsequently issuing the prepared statement with
      <A
HREF="function.db2-execute.html"
><B
CLASS="function"
>db2_execute()</B
></A
> enables the statements to reuse that
      access plan and avoids the overhead of dynamically creating a new access
      plan for every statement you issue.
     </P
></LI
><LI
><P
>&#13;      <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Security</I
></SPAN
>: when you prepare a statement, you can
      include parameter markers for input values. When you execute a prepared
      statement with input values for placeholders, the database server checks
      each input value to ensure that the type matches the column definition or
      parameter definition.
     </P
></LI
><LI
><P
>&#13;      <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Advanced functionality</I
></SPAN
>: Parameter markers not only
      enable you to pass input values to prepared SQL statements, they also
      enable you to retrieve OUT and INOUT parameters from stored procedures
      using <A
HREF="function.db2-bind-param.html"
><B
CLASS="function"
>db2_bind_param()</B
></A
>.
     </P
></LI
></UL
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN82119"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>connection</CODE
></DT
><DD
><P
>&#13;       A valid database connection resource variable as returned from
       <A
HREF="function.db2-connect.html"
><B
CLASS="function"
>db2_connect()</B
></A
> or <A
HREF="function.db2-pconnect.html"
><B
CLASS="function"
>db2_pconnect()</B
></A
>.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>statement</CODE
></DT
><DD
><P
>&#13;       An SQL statement, optionally containing one or more parameter markers..
      </P
></DD
><DT
><CODE
CLASS="parameter"
>options</CODE
></DT
><DD
><P
>&#13;       An associative array containing statement options. You can use this
       parameter to request a scrollable cursor on database servers that
       support this functionality.
       <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>cursor</CODE
></DT
><DD
><P
>&#13;           Passing the <TT
CLASS="literal"
>DB2_FORWARD_ONLY</TT
> value requests a
           forward-only cursor for this SQL statement. This is the default
           type of cursor, and it is supported by all database servers. It is
           also much faster than a scrollable cursor.
          </P
><P
>&#13;           Passing the <TT
CLASS="literal"
>DB2_SCROLLABLE</TT
> value requests a
           scrollable cursor for this SQL statement. This type of cursor
           enables you to fetch rows non-sequentially from the database
           server. However, it is only supported by DB2 servers, and is much
           slower than forward-only cursors.
          </P
></DD
></DL
></DIV
>
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN82149"
></A
><H2
>返回值</H2
><P
>&#13;   Returns a statement resource if the SQL statement was successfully parsed and
   prepared by the database server. Returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if the database server
   returned an error. You can determine which error was returned by calling
   <A
HREF="function.db2-stmt-error.html"
><B
CLASS="function"
>db2_stmt_error()</B
></A
> or <A
HREF="function.db2-stmt-errormsg.html"
><B
CLASS="function"
>db2_stmt_errormsg()</B
></A
>.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN82155"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN82158"
></A
><P
><B
>例 1. Preparing and executing an SQL statement with parameter markers</B
></P
><P
>&#13;     The following example prepares an INSERT statement that accepts four
     parameter markers, then iterates over an array of arrays containing the
     input values to be passed to <A
HREF="function.db2-execute.html"
><B
CLASS="function"
>db2_execute()</B
></A
>.
    </P
><TABLE
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BGCOLOR="#E0E0E0"
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><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$animals </font><font color="#007700">= array(<br />&nbsp;&nbsp;&nbsp;&nbsp;array(</font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#DD0000">'cat'</font><font color="#007700">, </font><font color="#DD0000">'Pook'</font><font color="#007700">, </font><font color="#0000BB">3.2</font><font color="#007700">),<br />&nbsp;&nbsp;&nbsp;&nbsp;array(</font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#DD0000">'dog'</font><font color="#007700">, </font><font color="#DD0000">'Peaches'</font><font color="#007700">, </font><font color="#0000BB">12.3</font><font color="#007700">),<br />&nbsp;&nbsp;&nbsp;&nbsp;array(</font><font color="#0000BB">2</font><font color="#007700">, </font><font color="#DD0000">'horse'</font><font color="#007700">, </font><font color="#DD0000">'Smarty'</font><font color="#007700">, </font><font color="#0000BB">350.0</font><font color="#007700">),<br />);<br /><br /></font><font color="#0000BB">$insert </font><font color="#007700">= </font><font color="#DD0000">'INSERT INTO animals (id, breed, name, weight)<br />&nbsp;&nbsp;&nbsp;&nbsp;VALUES (?, ?, ?, ?)'</font><font color="#007700">;<br /></font><font color="#0000BB">$stmt </font><font color="#007700">= </font><font color="#0000BB">db2_prepare</font><font color="#007700">(</font><font color="#0000BB">$conn</font><font color="#007700">, </font><font color="#0000BB">$insert</font><font color="#007700">);<br />if (</font><font color="#0000BB">$stmt</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;foreach (</font><font color="#0000BB">$animals </font><font color="#007700">as </font><font color="#0000BB">$animal</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">db2_execute</font><font color="#007700">(</font><font color="#0000BB">$stmt</font><font color="#007700">, </font><font color="#0000BB">$animal</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
   
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN82163"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
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><TBODY
><TR
><TD
><A
HREF="function.db2-bind-param.html"
><B
CLASS="function"
>db2_bind_param()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-execute.html"
><B
CLASS="function"
>db2_execute()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-stmt-error.html"
><B
CLASS="function"
>db2_stmt_error()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-stmt-errormsg.html"
><B
CLASS="function"
>db2_stmt_errormsg()</B
></A
></TD
></TR
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><P
></P
>
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