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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 >DESCRIBE</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="Embedded SQL Commands" HREF="ecpg-sql-commands.html"><LINK REL="PREVIOUS" TITLE="DECLARE" HREF="ecpg-sql-declare.html"><LINK REL="NEXT" TITLE="DISCONNECT" HREF="ecpg-sql-disconnect.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="REFENTRY" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="DECLARE" HREF="ecpg-sql-declare.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="ecpg-sql-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="DISCONNECT" HREF="ecpg-sql-disconnect.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="ECPG-SQL-DESCRIBE" ></A >DESCRIBE</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN45358" ></A ><H2 >Name</H2 >DESCRIBE -- obtain information about a prepared statement or result set</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN45361" ></A ><H2 >Synopsis</H2 ><PRE CLASS="SYNOPSIS" >DESCRIBE [ OUTPUT ] <TT CLASS="REPLACEABLE" ><I >prepared_name</I ></TT > USING [ SQL ] DESCRIPTOR <TT CLASS="REPLACEABLE" ><I >descriptor_name</I ></TT > DESCRIBE [ OUTPUT ] <TT CLASS="REPLACEABLE" ><I >prepared_name</I ></TT > INTO [ SQL ] DESCRIPTOR <TT CLASS="REPLACEABLE" ><I >descriptor_name</I ></TT > DESCRIBE [ OUTPUT ] <TT CLASS="REPLACEABLE" ><I >prepared_name</I ></TT > INTO <TT CLASS="REPLACEABLE" ><I >sqlda_name</I ></TT ></PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45369" ></A ><H2 >Description</H2 ><P > <TT CLASS="COMMAND" >DESCRIBE</TT > retrieves metadata information about the result columns contained in a prepared statement, without actually fetching a row. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45373" ></A ><H2 >Parameters</H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="REPLACEABLE" ><I >prepared_name</I ></TT ></DT ><DD ><P > The name of a prepared statement. This can be an SQL identifier or a host variable. </P ></DD ><DT ><TT CLASS="REPLACEABLE" ><I >descriptor_name</I ></TT ></DT ><DD ><P > A descriptor name. It is case sensitive. It can be an SQL identifier or a host variable. </P ></DD ><DT ><TT CLASS="REPLACEABLE" ><I >sqlda_name</I ></TT ></DT ><DD ><P > The name of an SQLDA variable. </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45391" ></A ><H2 >Examples</H2 ><PRE CLASS="PROGRAMLISTING" >EXEC SQL ALLOCATE DESCRIPTOR mydesc; EXEC SQL PREPARE stmt1 FROM :sql_stmt; EXEC SQL DESCRIBE stmt1 INTO SQL DESCRIPTOR mydesc; EXEC SQL GET DESCRIPTOR mydesc VALUE 1 :charvar = NAME; EXEC SQL DEALLOCATE DESCRIPTOR mydesc;</PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45394" ></A ><H2 >Compatibility</H2 ><P > <TT CLASS="COMMAND" >DESCRIBE</TT > is specified in the SQL standard. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN45398" ></A ><H2 >See Also</H2 ><A HREF="ecpg-sql-allocate-descriptor.html" >ALLOCATE DESCRIPTOR</A >, <A HREF="ecpg-sql-get-descriptor.html" >GET DESCRIPTOR</A ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="ecpg-sql-declare.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="ecpg-sql-disconnect.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >DECLARE</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecpg-sql-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >DISCONNECT</TD ></TR ></TABLE ></DIV ></BODY ></HTML >