fbsql_num_rows
(PHP 4 >= 4.0.6, PHP 5, PHP 7)
fbsql_num_rows — Get number of rows in result
Описание
int fbsql_num_rows
( resource
$result
)
Gets the number of rows in the given result set.
This function is only valid for SELECT statements. To retrieve the number of rows returned from a INSERT, UPDATE or DELETE query, use fbsql_affected_rows().
Список параметров
-
result -
Идентификатор результата запроса, полученный из fbsql_query() или fbsql_db_query().
Возвращаемые значения
Returns the number of rows returned by the last SELECT statement.
Примеры
Пример #1 fbsql_num_rows() example
<?php
$link = fbsql_connect("localhost", "username", "password");
fbsql_select_db("database", $link);
$result = fbsql_query("SELECT * FROM table1;", $link);
$num_rows = fbsql_num_rows($result);
echo "$num_rows Rows\n";
?>
Смотрите также
- fbsql_affected_rows() - Возвращает число затронутых строк в предыдущем FrontBase действии
- fbsql_connect() - Open a connection to a FrontBase Server
- fbsql_select_db() - Select a FrontBase database
- fbsql_query() - Send a FrontBase query
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- FrontBase
- fbsql_affected_rows
- fbsql_autocommit
- fbsql_blob_size
- fbsql_change_user
- fbsql_clob_size
- fbsql_close
- fbsql_commit
- fbsql_connect
- fbsql_create_blob
- fbsql_create_clob
- fbsql_create_db
- fbsql_data_seek
- fbsql_database_password
- fbsql_database
- fbsql_db_query
- fbsql_db_status
- fbsql_drop_db
- fbsql_errno
- fbsql_error
- fbsql_fetch_array
- fbsql_fetch_assoc
- fbsql_fetch_field
- fbsql_fetch_lengths
- fbsql_fetch_object
- fbsql_fetch_row
- fbsql_field_flags
- fbsql_field_len
- fbsql_field_name
- fbsql_field_seek
- fbsql_field_table
- fbsql_field_type
- fbsql_free_result
- fbsql_get_autostart_info
- fbsql_hostname
- fbsql_insert_id
- fbsql_list_dbs
- fbsql_list_fields
- fbsql_list_tables
- fbsql_next_result
- fbsql_num_fields
- fbsql_num_rows
- fbsql_password
- fbsql_pconnect
- fbsql_query
- fbsql_read_blob
- fbsql_read_clob
- fbsql_result
- fbsql_rollback
- fbsql_rows_fetched
- fbsql_select_db
- fbsql_set_characterset
- fbsql_set_lob_mode
- fbsql_set_password
- fbsql_set_transaction
- fbsql_start_db
- fbsql_stop_db
- fbsql_table_name
- fbsql_tablename
- fbsql_username
- fbsql_warnings
Коментарии
Note that this function will not always return the actual size of a result set. For example, if you are doing a two-table join along the lines of "SELECT * FROM T1,T2 where T1.x=T2.x" you will get a result of -1. This is due to the 'lazy execution' model in FrontBase whereby result rows are only returned as you request them. If you absolutely have to have the number of rows in advance then you will have to use COUNT(*) first. Most of the time you do not need to know the exact number of rows; it is good enough to know if the size of the result set is non-zero.
David Gillies
San Jose
Costa Rica