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pg_select

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

pg_select — Select records

Опис

pg_select(
    PgSql\Connection $connection,
    string $table_name,
    array $conditions = [],
    int $flags = PGSQL_DML_EXEC,
    int $mode = PGSQL_ASSOC
): array|string|false

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.

Параметри

connection

Примірник PgSql\Connection.

table_name

Name 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. As of PHP 8.4.0, when an empty array is provided, no conditions will apply. Previously, the function failed with an empty conditions argument.

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.

Значення, що повертаються

Returns string if PGSQL_DML_STRING is passed via flags, otherwise it returns an array on success, або false в разі помилки.

Журнал змін

Версія Опис
8.4.0 conditions is now optional.
8.1.0 Тепер параметр connection має бути примірником PgSql\Connection. Раніше очікувався resource.
7.1.0 The mode parameter was added.

Приклади

Приклад #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";
}
?>

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