(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
pg_select — Select records
$connection,$table_name,$conditions,$flags = PGSQL_DML_EXEC,$mode = PGSQL_ASSOC
pg_select() selects records specified by
conditions which has
field=>value. For a successful query, it returns an
array containing all records and fields that match the condition
specified by conditions.
If flags is set,
pg_convert() is applied to
conditions with the specified flags.
If mode is set,
the return value will be in the form of an array
with PGSQL_NUM, an associative array
with PGSQL_ASSOC (default) or both
with PGSQL_BOTH.
By default pg_select() passes raw values. Values must be escaped or PGSQL_DML_ESCAPE option must be specified. PGSQL_DML_ESCAPE quotes and escapes parameters/identifiers. Therefore, table/column names became case sensitive.
Note that neither escape nor prepared query can protect LIKE query, JSON, Array, Regex, etc. These parameters should be handled according to their contexts. i.e. Escape/validate values.
connectionAn PgSql\Connection instance.
table_nameName of the table from which to select rows.
conditions
An array whose keys are field names in the table table_name,
and whose values are the conditions that a row must meet to be retrieved.
flags
Any number of PGSQL_CONV_FORCE_NULL,
PGSQL_DML_NO_CONV,
PGSQL_DML_ESCAPE,
PGSQL_DML_EXEC,
PGSQL_DML_ASYNC or
PGSQL_DML_STRING combined. If PGSQL_DML_STRING is part of the
flags then the query string is returned. When PGSQL_DML_NO_CONV
or PGSQL_DML_ESCAPE is set, it does not call pg_convert() internally.
mode
Any number of PGSQL_ASSOC,
PGSQL_NUM or
PGSQL_BOTH
If PGSQL_ASSOC is set the return value will be an associative array,
with PGSQL_NUM the return value will be an array, and
with PGSQL_BOTH the return value will be both an associative and
numerically indexed array.
Returns string if PGSQL_DML_STRING is passed
via flags, otherwise it returns an array on success, or false on failure.
| Version | Description |
|---|---|
| 8.1.0 |
The connection parameter expects an PgSql\Connection
instance now; previously, a resource was expected.
|
| 7.1.0 |
The mode parameter was added.
|
Example #1 pg_select() example
<?php
$db = pg_connect('dbname=foo');
// This is safe somewhat, since all values are escaped.
// However PostgreSQL supports JSON/Array. These are not
// safe by neither escape nor prepared query.
$rec = pg_select($db, 'post_log', $_POST, PG_DML_ESCAPE);
if ($rec) {
echo "Records selected\n";
var_dump($rec);
} else {
echo "User must have sent wrong inputs\n";
}
?>