mysqli::$info
mysqli_info
(PHP 5, PHP 7, PHP 8)
mysqli::$info -- mysqli_info — 直近に実行されたクエリの情報を取得する
説明
オブジェクト指向型
手続き型
mysqli_info() 関数は、直近に実行されたクエリに ついての情報を文字列で返します。文字列の詳細は以下のとおりです。
| クエリの型 | 結果文字列の例 |
|---|---|
| INSERT INTO...SELECT... | Records: 100 Duplicates: 0 Warnings: 0 |
| INSERT INTO...VALUES (...),(...),(...) | Records: 3 Duplicates: 0 Warnings: 0 |
| LOAD DATA INFILE ... | Records: 1 Deleted: 0 Skipped: 0 Warnings: 0 |
| ALTER TABLE ... | Records: 3 Duplicates: 0 Warnings: 0 |
| UPDATE ... | Rows matched: 40 Changed: 40 Warnings: 0 |
注意:
これらのどれにも当てはまらない形式のクエリはサポートされません。 そのような場合、mysqli_info() は空文字列を返します。
戻り値
直近に実行されたクエリについての追加情報を文字列で返します。
例
例1 $mysqli->info の例
オブジェクト指向型
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$mysqli->query("CREATE TEMPORARY TABLE t1 LIKE City");
/* INSERT INTO ... SELECT */
$mysqli->query("INSERT INTO t1 SELECT * FROM City ORDER BY ID LIMIT 150");
printf("%s\n", $mysqli->info);手続き型
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
mysqli_query($link, "CREATE TEMPORARY TABLE t1 LIKE City");
/* INSERT INTO ... SELECT */
mysqli_query($link, "INSERT INTO t1 SELECT * FROM City ORDER BY ID LIMIT 150");
printf("%s\n", mysqli_info($link));上の例の出力は以下となります。
Records: 150 Duplicates: 0 Warnings: 0
参考
- mysqli_affected_rows() - 直前の MySQL の操作で変更された行の数を得る
- mysqli_warning_count() - 指定した接続の直近のクエリから発生した警告の数を返す
- mysqli_num_rows() - 結果セットの行数を取得する
＋add a note
User Contributed Notes 3 notes
user at biglake dot com ¶
14 years ago
Might save someone some time...
<?php
$prototype='Rows matched: 0 Changed: 1 Warnings: 2';
list($matched, $changed, $warnings) = sscanf($prototype, "Rows matched: %d Changed: %d Warnings: %d");
?>
Rumour ¶
6 months ago
I don't recall where I got this, but it is SUPER important information and I cannot believe it is missing from the documentation!
If you do a mysqli_info()/$mysqli->info() after a "INSERT INTO ... VALUES ()" that adds/updates JUST ONE ROW, then, mysqli::info() returns an empty result (!!!).
If it is empty (null on php 8+; in php 7 I don't know in which way it is empty) check $mysqli->affectedRows() or mysqli_affected_rows(). If that returns 2, the INSERT did a successful UPDATE of ONE record (so there must have been a ON DUPLICATE KEY UPDATE). If it returns 1: there was an INSERT of ONE record.
This is not a bug, this is BY DESIGN, although it does remind me strongly of "This is not a bug, this is a feature" Microsoft of the 90's. I have no clue why you would design it this way except for some weird and extremely old backward compatibility issues.
vzverev [at] newmail.ru (Vasiliy Zverev) ¶
7 years ago
If inserted just one row, mysqli_info() returns empty string which might be confusing, but mysqli_affected_rows() returns 1 in this case.