mysqli::$info
mysqli_info
(PHP 5, PHP 7, PHP 8)
mysqli::$info -- mysqli_info — 返回最近执行的 SQL 语句的信息
说明
面向对象风格
过程化风格
mysqli_info() 函数返回一个包含 最近执行的 SQL 语句信息的字符串。 下面有一些参考样例：
| SQL 语句类型 | 返回结果字符串示例 |
|---|---|
| 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:
如果所执行的 SQL 语句不是上面列出来的这几种类型的， mysqli_info() 函数会返回一个空字符串。
返回值
最近执行的 SQL 语句的相关信息。
示例
示例 #1 $mysqli->info 示例
面向对象风格
<?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);过程化风格
<?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));以上示例会输出：
Records: 150 Duplicates: 0 Warnings: 0
参见
- mysqli_affected_rows() - Gets the number of affected rows in a previous MySQL operation
- mysqli_warning_count() - Returns the number of warnings generated by the most recently executed query
- mysqli_num_rows() - Gets the number of rows in the result set
＋添加备注
用户贡献的备注 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 ¶
8 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.