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>pg_exec</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN608"
></A
><H2
>Name</H2
>pg_exec -- send a command to the server<A
NAME="IX-PGTCL-PGEXEC-2"
></A
></DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN613"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>pg_exec <VAR
CLASS="PARAMETER"
>conn</VAR
> <VAR
CLASS="PARAMETER"
>commandString</VAR
> ?<SPAN
CLASS="OPTIONAL"
><VAR
CLASS="PARAMETER"
>args</VAR
></SPAN
>?</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN619"
></A
><H2
>Description</H2
><P
> <CODE
CLASS="FUNCTION"
>pg_exec</CODE
> submits a command to the
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> server and returns a result.
Command result handles start with the connection handle and add a
period and a result number.
</P
><P
> Note that lack of a Tcl error is not proof that the command
succeeded! An error message returned by the server will be
processed as a command result with failure status, not by
generating a Tcl error in <CODE
CLASS="FUNCTION"
>pg_exec</CODE
>.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN626"
></A
><H2
>Arguments</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><VAR
CLASS="PARAMETER"
>conn</VAR
></DT
><DD
><P
> The handle of the connection on which to execute the command.
</P
></DD
><DT
><VAR
CLASS="PARAMETER"
>commandString</VAR
></DT
><DD
><P
> The SQL command to execute.
</P
></DD
><DT
><VAR
CLASS="PARAMETER"
>args</VAR
></DT
><DD
><P
> For <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> versions greater than 7.4, <VAR
CLASS="PARAMETER"
>args</VAR
>
consists of zero or more optional values that can be inserted,
unquoted, into the SQL statement using $-style substitution.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN646"
></A
><H2
>Return Value</H2
><P
> A result handle. A Tcl error will be returned if
<SPAN
CLASS="APPLICATION"
>pgtcl</SPAN
> was unable to obtain a server
response. Otherwise, a command result object is created and a
handle for it is returned. This handle can be passed to
<CODE
CLASS="FUNCTION"
>pg_result</CODE
> to obtain the results of the
command.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN651"
></A
><H2
>Example</H2
><P
></P><PRE
CLASS="PROGRAMLISTING"
>pg_exec $conn {select * from table1 where id = $1 and user = $2} $id $user</PRE
><P>
</P
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