It Started With a Simple Query… It was a regular Thursday afternoon. I was adding a bulk delete feature to our e-commerce platform when I hit “save” and watched the server restart. Everything compiled fine. The linter was happy. The tests passed. Then I clicked the “Delete Selected” button with no items selected. [15:59:28.503] ERROR: Internal server error DatabaseError: syntax error at or near ")" code: "42601" position: "5490" Syntax error? Near a parenthesis? I checked my SQL query three times. Four times. Copy-pasted it into pgAdmin and ran it manually. It worked perfectly. But in production? It failed every single time. Sound familiar? If you’ve ever seen this cryptic error message while working with PostgreSQL and Node.js, you’re not alone. And I’m about to save you the 3 hours I wasted tracking it down. The Culprit: A Pattern We’ve All Written Here’s what my code looked like: async function deleteProducts(productIds) { const result = await db.quer...
Client Server model is utilizes clients and server devices, each designed for specific purpose. It used in Internet as well as LAN(s). Examples of Client server devices are : Web browser and Web Servers FTP browsers and web servers. DNS servers. CLIENT AND SERVER Client devices are normally PCs with network software applications installed that are able to request and and receive in formations through internet. Examples for clients : Mobile Devices as well as Desktop computers. Server devices are typically store file and databases with complex applications like as websites. Features of a server device is : high-power central processor, larger disk drives(large capacity) than clients. CLIENT- SERVER APPLICATIONS The client server model distinguish between devices and as well as applications. Examples : email, FTP and web services CLIENT- SERVER MODEL IN LAN Many home networks utilized this system. Examples Broad...
Introduction: Missionaries and Cannibals is a notable problem in Artificial Intelligence in which three Missionaries and three Cannibals attempt to cross a river to the other side using a boat. However, there are constraints on the problem, most notably that there can never be more Cannibals than Missionaries on either side of the river (as they will be eaten!), the boat must always take across at least one person, and the goal state is when all Missionaries and all Cannibals have successfully reached the right side of the river from the left. Thus, with these constraints in mind, they can be programmed into Prolog fairly simply, and a solution can be searched for.
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