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postgresql8.4-docs-8.4.12-0.1mdv2010.2.i586.rpm

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>dblink_build_sql_update</H1
><DIV
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><A
NAME="AEN115507"
></A
><H2
>Name</H2
>dblink_build_sql_update&nbsp;--&nbsp;builds an UPDATE statement using a local tuple, replacing
    the primary key field values with alternative supplied values
   </DIV
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><A
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></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>    dblink_build_sql_update(text relname,
                            int2vector primary_key_attnums,
                            int2 num_primary_key_atts,
                            text[] src_pk_att_vals_array,
                            text[] tgt_pk_att_vals_array) returns text
   </PRE
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></A
><H2
>Description</H2
><P
>    <CODE
CLASS="FUNCTION"
>dblink_build_sql_update</CODE
> can be useful in doing selective
    replication of a local table to a remote database.  It selects a row
    from the local table based on primary key, and then builds a SQL
    <TT
CLASS="COMMAND"
>UPDATE</TT
> command that will duplicate that row, but with
    the primary key values replaced by the values in the last argument.
    (To make an exact copy of the row, just specify the same values for
    the last two arguments.)  The <TT
CLASS="COMMAND"
>UPDATE</TT
> command always assigns
    all fields of the row &mdash; the main difference between this and
    <CODE
CLASS="FUNCTION"
>dblink_build_sql_insert</CODE
> is that it's assumed that
    the target row already exists in the remote table.
   </P
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><A
NAME="AEN115519"
></A
><H2
>Arguments</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="PARAMETER"
>relname</TT
></DT
><DD
><P
>       Name of a local relation, for example <TT
CLASS="LITERAL"
>foo</TT
> or
       <TT
CLASS="LITERAL"
>myschema.mytab</TT
>.  Include double quotes if the
       name is mixed-case or contains special characters, for
       example <TT
CLASS="LITERAL"
>"FooBar"</TT
>; without quotes, the string
       will be folded to lower case.
      </P
></DD
><DT
><TT
CLASS="PARAMETER"
>primary_key_attnums</TT
></DT
><DD
><P
>       Attribute numbers (1-based) of the primary key fields,
       for example <TT
CLASS="LITERAL"
>1 2</TT
>.
      </P
></DD
><DT
><TT
CLASS="PARAMETER"
>num_primary_key_atts</TT
></DT
><DD
><P
>       The number of primary key fields.
      </P
></DD
><DT
><TT
CLASS="PARAMETER"
>src_pk_att_vals_array</TT
></DT
><DD
><P
>       Values of the primary key fields to be used to look up the
       local tuple.  Each field is represented in text form.
       An error is thrown if there is no local row with these
       primary key values.
      </P
></DD
><DT
><TT
CLASS="PARAMETER"
>tgt_pk_att_vals_array</TT
></DT
><DD
><P
>       Values of the primary key fields to be placed in the resulting
       <TT
CLASS="COMMAND"
>UPDATE</TT
> command.  Each field is represented in text form.
      </P
></DD
></DL
></DIV
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><A
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></A
><H2
>Return Value</H2
><P
>Returns the requested SQL statement as text.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN115555"
></A
><H2
>Example</H2
><PRE
CLASS="PROGRAMLISTING"
> test=# select dblink_build_sql_update('foo', '1 2', 2, '{"1", "a"}', '{"1", "b"}');
                    dblink_build_sql_update
 -------------------------------------------------------------
  UPDATE foo SET f1='1',f2='b',f3='1' WHERE f1='1' AND f2='b'
 (1 row)
   </PRE
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