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PHP : Function Reference : MySQL Improved Extension : mysqli_stmt_num_rows

mysqli_stmt_num_rows

Return the number of rows in statements result set (PHP 5)
int mysqli_stmt_num_rows ( mysqli_stmt stmt )

Example 1570. Object oriented style

<?php
/* Open a connection */
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
   
printf("Connect failed: %s\n", mysqli_connect_error());
   exit();
}

$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
if (
$stmt = $mysqli->prepare($query)) {

   
/* execute query */
   
$stmt->execute();

   
/* store result */
   
$stmt->store_result();

   
printf("Number of rows: %d.\n", $stmt->num_rows);

   
/* close statement */
   
$stmt->close();
}

/* close connection */
$mysqli->close();
?>

Example 1571. Procedural style

<?php
/* Open a connection */
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
   
printf("Connect failed: %s\n", mysqli_connect_error());
   exit();
}

$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
if (
$stmt = mysqli_prepare($link, $query)) {

   
/* execute query */
   
mysqli_stmt_execute($stmt);

   
/* store result */
   
mysqli_stmt_store_result($stmt);

   
printf("Number of rows: %d.\n", mysqli_stmt_num_rows($stmt));

   
/* close statement */
   
mysqli_stmt_close($stmt);
}

/* close connection */
mysqli_close($link);
?>

Code Examples / Notes » mysqli_stmt_num_rows

typer85

Please be advised, for people who sometimes miss to read this important Manual entry for this function:
If you do not use mysqli_stmt_store_result( ), and immediatley call this function after executing a prepared statement, this function will usually return 0 as it has no way to know how many rows are in the result set as the result set is not saved in memory yet.
mysqli_stmt_store_result( ) saves the result set in memory thus you can immedietly use this function after you both execute the statement AND save the result set.
If you do not save the result set but still want to use this function you have to actually loop through the result set one row at a time using mysqli_stmt_fetch( ) before using this function to determine the number of rows.
A thought though, if you want to determine the number of rows without storing the result set and after looping through it, why not just simply keep an internal counter in your loop every time a row is fetched and save the function call.
In short, this function is only really useful if you save the result set and want to determine the number of rows before looping through it, otherwise you can pretty much recreate its use like I suggested.


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mysqli_affected_rows
mysqli_autocommit
mysqli_bind_param
mysqli_bind_result
mysqli_change_user
mysqli_character_set_name
mysqli_client_encoding
mysqli_close
mysqli_commit
mysqli_connect_errno
mysqli_connect_error
mysqli_connect
mysqli_data_seek
mysqli_debug
mysqli_disable_reads_from_master
mysqli_disable_rpl_parse
mysqli_dump_debug_info
mysqli_embedded_server_end
mysqli_embedded_server_start
mysqli_enable_reads_from_master
mysqli_enable_rpl_parse
mysqli_errno
mysqli_error
mysqli_escape_string
mysqli_execute
mysqli_fetch_array
mysqli_fetch_assoc
mysqli_fetch_field_direct
mysqli_fetch_field
mysqli_fetch_fields
mysqli_fetch_lengths
mysqli_fetch_object
mysqli_fetch_row
mysqli_fetch
mysqli_field_count
mysqli_field_seek
mysqli_field_tell
mysqli_free_result
mysqli_get_charset
mysqli_get_client_info
mysqli_get_client_version
mysqli_get_host_info
mysqli_get_metadata
mysqli_get_proto_info
mysqli_get_server_info
mysqli_get_server_version
mysqli_get_warnings
mysqli_info
mysqli_init
mysqli_insert_id
mysqli_kill
mysqli_master_query
mysqli_more_results
mysqli_multi_query
mysqli_next_result
mysqli_num_fields
mysqli_num_rows
mysqli_options
mysqli_param_count
mysqli_ping
mysqli_prepare
mysqli_query
mysqli_real_connect
mysqli_real_escape_string
mysqli_real_query
mysqli_report
mysqli_rollback
mysqli_rpl_parse_enabled
mysqli_rpl_probe
mysqli_rpl_query_type
mysqli_select_db
mysqli_send_long_data
mysqli_send_query
mysqli_server_end
mysqli_server_init
mysqli_set_charset
mysqli_set_local_infile_default
mysqli_set_local_infile_handler
mysqli_set_opt
mysqli_slave_query
mysqli_sqlstate
mysqli_ssl_set
mysqli_stat
mysqli_stmt_affected_rows
mysqli_stmt_attr_get
mysqli_stmt_attr_set
mysqli_stmt_bind_param
mysqli_stmt_bind_result
mysqli_stmt_close
mysqli_stmt_data_seek
mysqli_stmt_errno
mysqli_stmt_error
mysqli_stmt_execute
mysqli_stmt_fetch
mysqli_stmt_field_count
mysqli_stmt_free_result
mysqli_stmt_get_warnings
mysqli_stmt_init
mysqli_stmt_insert_id
mysqli_stmt_num_rows
mysqli_stmt_param_count
mysqli_stmt_prepare
mysqli_stmt_reset
mysqli_stmt_result_metadata
mysqli_stmt_send_long_data
mysqli_stmt_sqlstate
mysqli_stmt_store_result
mysqli_store_result
mysqli_thread_id
mysqli_thread_safe
mysqli_use_result
mysqli_warning_count
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