pg_select

PostgreSQL
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pg_select

Name

pg_select — loop over the result of a SELECT statement

pg_select dbHandle queryString
  arrayVar queryProcedure

Inputs

dbHandle: Specifies a valid database handle.
queryString: Specifies a valid SQL select query.
arrayVar: Array variable for tuples returned.
queryProcedure: Procedure run on each tuple found.

Outputs

resultHandle: the return result is either an error message or a handle for a query result.

Description

pg_select submits a SELECT query to the Postgres backend, and executes a given chunk of code for each tuple in the result. The queryString must be a SELECT statement. Anything else returns an error. The arrayVar variable is an array name used in the loop. For each tuple, arrayVar is filled in with the tuple field values, using the field names as the array indexes. Then the queryProcedure is executed.

Usage

This would work if table "table" has fields "control" and "name" (and, perhaps, other fields):

	pg_select $pgconn "SELECT * from table" array {
		puts [format "%5d %s" array(control) array(name)]
	}

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