PostgreSQL Programmer's Guide
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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

queryHandle

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

Description

pg_select submits a query to the Postgres backend. and returns the results. The queryString must be a select statement. Anything else returns an error. The arrayVar variable is an array name used in the loop. It is filled out with the result of the query for each tuple using the field names as the associative indices.

Usage

	set DB "mydb"
	set conn [pg_connect $DB]
	pg_select $conn "SELECT * from table" array {
		puts [format "%5d %s" array(control) array(name)]
	}
	pg_disconnect $conn

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