Tutorial by Topics: integer



The BigInteger class is used for mathematical operations involving large integers with magnitudes too large for primitive data types. For example 100-factorial is 158 digits - much larger than a long can represent. BigInteger provides analogues to all of Java's primitive integer operators, and all relevant methods from java.lang.Math as well as few other operations.

The class template std::integer_sequence<Type, Values...> represents a sequence of values of type Type where Type is one of the built-in integer types. These sequences are used when implementing class or function templates which benefit from positional access. The standard library also contains "factory" types which create ascending sequences of integer values just from the number of elements.

This script is designed to handle reporting devices (IoT), when a device is not previously authorized (in the devices table in the database), I add the new device to a new_devices table. I run an update query, and if affected_rows returns < 1, I insert.

When I have a new device report, the first time $stmt->affected_rows runs it returns 0, subsequent communication returns 1, then 1, 0, 2, 2, 2, 0, 3, 3, 3, 3, 3, 3, 0, 4, 0, 0, 6, 6, 6, etc

It's as if the update statement is failing. Why?


Page 1 of 1