An issue you should pay attention to when performing Update during cursor operation_PHP Tutorial

When performing a cursor operation, if you use the Order by clause, but the Order by field does not have an index, it will cause the cursor to be a read-only attribute, and the
cannot be specified as the for Update state. The solution to
is: Remove the Order by clause or index the Order by field.

http://www.bkjia.com/PHPjc/631204.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631204.htmlTechArticleWhen performing cursor operations, if you use the Order by clause, but the Order by field does not have an index, then This will cause the cursor to be a read-only attribute, and cannot be specified as for Update state. The solution is...