绑定布尔值的 bind_param 问题
我在 PHP5 中使用 mysqli_stmt::bind_param 绑定布尔值时遇到问题.
I have a problem binding booleans using mysqli_stmt::bind_param in PHP5.
SQL 查询如下:
insert into `nvp_notes` (subject,messageid,receivedate,read) values (?,?,?,?)
其中 'read' 是一个 tinyint，可以是 0 或 1，因为我在使用 mysqli 时遇到了 bit 问题.所以我在 bind_param 中列出的类型是:
Where 'read' is a tinyint, either 0 or 1, as I've had issues with bit using mysqli. So the types that I list in bind_param are:
$stmt->bind_param('sdsd', ...);
我也试过 'sdsb' 和 'sdss' 但似乎没有任何效果，我总是收到消息:
I've also tried 'sdsb' and 'sdss' but nothing seems to work, and I always get the message:
警告:mysqli_stmt::bind_param(): 变量数与准备语句中的参数数不匹配
Warning: mysqli_stmt::bind_param(): Number of variables doesn't match number of parameters in prepared statement
当我删除语句中的读取字段时，一切正常.我已经用完了这个想法.bind_param 肯定适用于布尔值吗?
When I remove the read field in the statement everything works fine. I've run out of ideas with this one. Surely bind_param works with booleans?
推荐答案
您可以使用 intval 将布尔值转换为 1 或 0()(或者用 (int) 或 (integer) 来转换).根据 mysqli_stmt::bind_param() 的文档，您可以绑定的唯一类型是整数、双精度数、字符串和 blob.
You could convert the boolean to a 1 or 0 using intval() (or cast it with (int) or (integer)). According to mysqli_stmt::bind_param()'s documentation, the only types you may bind are ints, doubles, strings, and blobs.
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