October 2019
Intermediate to advanced
444 pages
10h 37m
English
Content preview from Rust Programming Cookbook
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How it works...
Working with diesel-rs requires a good understanding of how it works internally to achieve the desired results. Check out the previous recipe (Using an ORM to save data to a database) for some details on the basics. In this recipe, we are diving straight into the more advanced stuff.
After some basic setup in step 1, step 2 creates a new handler that fetches all bookmarks added on a particular day and returns the date as a Julian date (https://en.wikipedia.org/wiki/Julian_day). The calculation is done using one of SQLite's few scalar functions: juliandate() (https://www.sqlite.org/lang_datefunc.html). So, how did we get the function into Rust? Step 4 shows the diesel-rs way: by using a sql_function! macro (https://docs.diesel.rs/diesel/macro.sql_function.html ...
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