![]() ![]() This router allows you to use React's latest features and is an evolution of the Pages Router based on community feedback.Ĭreate an app/ folder, then add a layout.tsx and page.tsx file. The app directoryįor new applications, we recommend using the App Router. Next.js uses file-system routing, which means the routes in your application are determined by how you structure your files. lint: runs next lint to set up Next.js' built-in ESLint configuration.start: runs next start to start a Next.js production server.build: runs next build to build the application for production usage.dev: runs next dev to start Next.js in development mode.If you did not understand the preceding paragraph then read the next section.These scripts refer to the different stages of developing an application: ![]() The bottom line is this: if you try to start an application program and it complains that it cannot connect to the database, you should consult your site administrator or, if that is you, the documentation to make sure that your environment is properly set up. The environment variable PGPORT might also have to be set. For example, if the database server machine is a remote machine, you will need to set the PGHOST environment variable to the name of the database server machine. If your site administrator has not set things up in the default way, you might have some more work to do. ![]() Be sure to follow closely the section about setting up the appropriate environment variables. If you are installing PostgreSQL yourself, then refer to Chapter 16 for instructions on installation, and return to this guide when the installation is complete. PostgreSQL can be installed by any unprivileged user no superuser ( root) access is required. Doing so is not hard and it can be a good exercise. If you are not sure whether PostgreSQL is already available or whether you can use it for your experimentation then you can install it yourself. If that is the case, you should obtain information from the operating system documentation or your system administrator about how to access PostgreSQL. It is possible that PostgreSQL is already installed at your site, either because it was included in your operating system distribution or because the system administrator already installed it. Before you can use PostgreSQL you need to install it, of course. ![]()
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