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Top Forums Shell Programming and Scripting Taking information from a postgres sql query and putting it into a shell script array Post 302900140 by SriniShoo on Monday 5th of May 2014 04:19:03 AM
Old 05-05-2014
First, the array values start from 0
and, there are several ways of doing this

Code:
 
for i in $(seq 0 $((${#age[@]} - 1)))
do
grade_${i}=$(psql -h $PSQL_HOST $PSQL_RDB $PSQL_USER << EOFF
BEGIN TRANSACTION;
select grade_level from characteristcs where age=${age[$i]};
END TRANSACTION
\q
EOFF
)
done

The above approach is costly as it required one DB Connection for each value of the array age.

Rather, you can go with the below approach and run all the details into grade array
Code:
 
for i in $(seq 0 $((${#age[@]} - 1)))
do
echo "select grade_level from characteristcs where age=${age[$i]}"
done > query.sql
grade=($(psql -h $PSQL_HOST $PSQL_RDB $PSQL_USER -a -f query.sql))

 

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PDO.QUERY(3)								 1							      PDO.QUERY(3)

PDO
::query - Executes an SQL statement, returning a result set as a PDOStatement object SYNOPSIS
public PDOStatement PDO::query (string $statement) DESCRIPTION
PDOStatement PDO::query (string $statement, int $PDO::FETCH_COLUMN, int $colno) PDOStatement PDO::query (string $statement, int $PDO::FETCH_CLASS, string $classname, array $ctorargs) PDOStatement PDO::query (string $statement, int $PDO::FETCH_INTO, object $object) PDO.query(3) executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a PDOStatement object. For a query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO.pre- pare(3) and issue the statement with multiple calls to PDOStatement.execute(3). If you do not fetch all of the data in a result set before issuing your next call to PDO.query(3), your call may fail. Call PDOState- ment.closeCursor(3) to release the database resources associated with the PDOStatement object before issuing your next call to PDO.query(3). Note Although this function is only documented as having a single parameter, you may pass additional arguments to this function. They will be treated as though you called PDOStatement.setFetchMode(3) on the resultant statement object. PARAMETERS
o $statement - The SQL statement to prepare and execute. Data inside the query should be properly escaped. RETURN VALUES
PDO.query(3) returns a PDOStatement object, or FALSE on failure. EXAMPLES
Example #1 Demonstrate PDO::query A nice feature of PDO.query(3) is that it enables you to iterate over the rowset returned by a successfully executed SELECT state- ment. <?php function getFruit($conn) { $sql = 'SELECT name, color, calories FROM fruit ORDER BY name'; foreach ($conn->query($sql) as $row) { print $row['name'] . " "; print $row['color'] . " "; print $row['calories'] . " "; } } ?> The above example will output: apple red 150 banana yellow 250 kiwi brown 75 lemon yellow 25 orange orange 300 pear green 150 watermelon pink 90 SEE ALSO
PDO.exec(3), PDO.prepare(3), PDOStatement.execute(3). PHP Documentation Group PDO.QUERY(3)
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