PostgreSQL
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# pg_result

## Name

pg_result — get information about a query result

    pg_result resultHandle resultOption

### Inputs

`resultHandle`

  The handle for a query result.

`resultOption`

  Specifies one of several possible options.

#### Options

-status

  the status of the result.

-error

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

-conn

  the connection that produced the result.

-oid

  if the command was an INSERT, the OID of the inserted tuple; otherwise an empty string.

-numTuples

  the number of tuples returned by the query.

-numAttrs

  the number of attributes in each tuple.

-list VarName

  assign the results to a list of lists.

-assign arrayName

  assign the results to an array, using subscripts of the form (tupno,attributeName).

-assignbyidx arrayName ?appendstr?

  assign the results to an array using the first attribute's value and the remaining attributes' names as keys. If appendstr is given then it is appended to each key. In short, all but the first field of each tuple are stored into the array, using subscripts of the form (firstFieldValue,fieldNameAppendStr).

-getTuple tupleNumber

  returns the fields of the indicated tuple in a list. Tuple numbers start at zero.

-tupleArray tupleNumber arrayName

  stores the fields of the tuple in array arrayName, indexed by field names. Tuple numbers start at zero.

-attributes

  returns a list of the names of the tuple attributes.

-lAttributes

  returns a list of sublists, {name ftype fsize} for each tuple attribute.

-clear

  clear the result query object.

### Outputs

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

## Description

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

You can keep a query 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've created too many query result objects.

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