PostgreSQL 7.4.18 Documentation
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# pg_result

## Name

pg_result -- get information about a command result

## Synopsis

    pg_result resultHandle resultOption

## Description

`pg_result` returns information about a command result created by a prior `pg_exec`.

You can keep a command result around for as long as you need it, but when you are done with it, be sure to free it by executing `pg_result -clear`. Otherwise, you have a memory leak, and pgtcl will eventually start complaining that you have created too many command result objects.

## Arguments

`resultHandle`

  The handle of the command result.

`resultOption`

  One of the following options, specifying which piece of result information to return:

  `-status`

    The status of the result.

  `-error`

    The error message, if the status indicates an error, otherwise an empty string.

  `-conn`

    The connection that produced the result.

  `-oid`

    If the command was an `INSERT`, the OID of the inserted row, otherwise 0.

  `-numTuples`

    The number of rows (tuples) returned by the query.

  `-cmdTuples`

    The number of rows (tuples) affected by the command.

  `-numAttrs`

    The number of columns (attributes) in each row.

  `-assign `arrayName``

    Assign the results to an array, using subscripts of the form `(rowNumber, columnName)`.

  `-assignbyidx `arrayName` ?`appendstr`?`

    Assign the results to an array using the values of the first column and the names of the remaining column as keys. If `appendstr` is given then it is appended to each key. In short, all but the first column of each row are stored into the array, using subscripts of the form `(firstColumnValue, columnNameAppendStr)`.

  `-getTuple `rowNumber``

    Returns the columns of the indicated row in a list. Row numbers start at zero.

  `-tupleArray `rowNumber` `arrayName``

    Stores the columns of the row in array `arrayName`, indexed by column names. Row numbers start at zero.

  `-attributes`

    Returns a list of the names of the columns in the result.

  `-lAttributes`

    Returns a list of sublists, `{name typeOid typeSize}` for each column.

  `-clear`

    Clear the command result object.

## Return Value

The result depends on the selected option, as described above.

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