Controller, information processing apparatus, and recording medium

An information processing apparatus to be connected to a controller, wherein

• the controller is connected to a database system and comprises:
• a statement transmitting unit configured to, at the time of executing a user program comprising an access instruction for accessing the database system, generate a statement according to the access instruction, and transmit the generated statement to the database system;
• and
• an acquiring unit configured to store into a memory time information indicative of time since the transmission of the generated statement to the database system by the statement transmitting unit until reception of a response from the database system, and
• the information processing apparatus comprises:
• a reception processing unit configured to receive the time information stored in the memory by the acquiring unit from the controller;
• and
• a display processing unit configured to display the time information received by the reception processing unit on a monitor.

A computer-readable recording medium storing a computer program executable by a processor and configured to control operation of a controller, wherein

• the controller comprises a communication interface configured to access a database system, the processor, and a memory, and
• the program causes the processor to execute:
• a step of executing a user program to control a control object;
• a step of, at the time of executing the user program comprising an access instruction to access the database system, generating a statement according to the access instruction and transmitting the generated statement to the database system via the communication interface;
• a step of storing into the memory information indicative of time since transmission of the generated statement to the database system until reception of a response from the database system;
• and
• a step of outputting the stored information to the information processing apparatus connected to the controller.

A controller comprising:

• a communication interface configured to be connected to a database system;
• a processor;
• and
• a memory,
• wherein the processor executes a user program to control a control object, at the time of executing an access instruction to access the database system that is included in the user program, generates a statement according to the access instruction, transmits the generated statement to the database system via the communication interface, and stores into the memory information indicative of time until reception of a response from the database system since the transmission.