PostgreSQL 7.4.3 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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