Property AsFloat : TJSONFloat Read GetAsFloat Write SetAsFloat Property AsUnicodeString : TJSONUnicodeStringType Read GetAsUnicodeString Write SetAsUnicodeString as properties of TJSONData Property AsString : TJSONStringType Read GetAsString Write SetAsString You have plenty of options for the types of data you can. We’ll use FindPath with AsString to get the data as an AnsiString. With the Value now cast as a TJSONObject it’s very easy to access the data. Value contains the data and we just cast as a TJSONObject before we can get at the goodies. GetJSON returns TJSONData which we cast to a TJSONArray since we know that’s what’s being returned.įrom there we use the TJSON Enumerator. We need fpjson and jsonparser to work with the data, and fphttpclient to make the api calls. This should all be pretty self-explanatory.

WriteLn(person.FindPath('company.name').AsString) WriteLn(person.FindPath('address.street').AsString) WriteLn(person.FindPath('name').AsString) Person := TJSONObject(personEnum.Value) // Output a few pieces of data as example. People := TJSONArray(GetJSON(rawJson)) // Loop using the TJSONEnumerator RawJson := TFPHTTPClient.SimpleGet(url) // Convert to TJSONData and cast as TJSONArray The first program looks like this program json_example uses fpjson, jsonparser, fphttpclient const url = ' ' var We’ll loop those records and output the id name address.street and company.name for each record. 'catchPhrase': 'Multi-layered client-server neural-net',

Those objects have both simple data like strings and a couple of nested objects. This endpoint return 10 user records as an array of objects. I’m going to show you a very simple way to make a GET API call and access the JSON data, and then I’m going to show you how to generate a block of JSON and POST it to an API endpoint.Īnd we’re still just using the packages bundled with Lazarus. Tables for the club members and for their collector items, plus some helper files.That’s why I decided to write this little crash course.Įverything we need comes bundled with Lazarus, no need to install extras. We'll show you how to set up and program a Relational Database Management System (RDBMS) for our imaginary 'GuitarClub'. The advantage of using SQLDB is that it is fairly easy to change to a different database such as Firebird or PostgreSQL without changing your program too much. You find the built-in SQLDB components of Lazarus on the SQLdb tab of the Component Palette. Information held in an SQLite database file is easily accessible usingĬommonly available open-source tools, such as DB Browser for SQLite. Instead, dates and times are stored as TEXT, REAL, or INTEGER values. There is no storage class for dates and/or times. Values are stored as integers 0 (false) and 1 (true). There is no separate Boolean storage class. BLOB: for 'blobs' of data, stored exactly as they were was input.You can use any custom file suffix, for example. SQLite does not have any file naming requirements. SQLite is in the public domain, most developers use it in their projects without ever telling us.Ī complete SQLite database with multiple tables can be contained in a single disk file. Mozilla, in the Firefox Web Browser and in the Thunderbird email reader.Microsoft, as a core component of Windows 10, and in other products.The United States Library of Congress recognizes SQLite as a recommended storage format for preservation of digital content.Google, in their Android cell-phone operating system, and in the Chrome Web Browser.Bosch, in the multimedia systems installed on GM, Nissan, and Suzuki automobiles.Apple, in many of the native applications running on Mac OS-X desktops and servers and on iOS devices such as iPhones and iPods.Adobe, as the application file format for their Photoshop Lightroom.A few of the better-known users of SQLite are shown below: There are billions of SQLite database files in use daily, on smartphones and SQLite is the most widely deployed database in the world. It reads and writes directly to disk files.

SQLite is for embedded (non-server) databases. SQL allows working with relational databases.Īlmost SQL database system has its own dialect, but a large number of SQL statements are the same for all of them. SQL stands for Structured Query Language.

Lazarus postgresql tutorial