mysqli::$info()

(PHP 5, PHP 7)

返回最近执行的 SQL 语句的信息

说明

面向对象风格
string $mysqli->info;

过程化风格
mysqli_info(mysqli$link): string

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：

Note:

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。

参数

$link

仅以过程化样式：由mysqli_connect()或mysqli_init()返回的链接标识。

返回值

最近执行的 SQL 语句的相关信息。

范例

Example #1$mysqli->info例程

面向对象风格

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* 检查连接 */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}
$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);
/* 关闭连接 */
$mysqli->close();
?>

过程化风格

<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* 检查连接 */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}
mysqli_query($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));
/* 关闭连接 */
mysqli_close($link);
?>

以上例程会输出：

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 from the last query for the given link
• mysqli_num_rows() Gets the number of rows in a result

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");
?>

If inserted just one row, mysqli_info() returns empty string which might be confusing, but mysqli_affected_rows() returns 1 in this case.