jiff-sqlx: add integration crate for SQLx

This PR adds a new `jiff-sqlx` crate. It defines wrapper types for
`Timestamp`, `DateTime`, `Date`, `Time` and `Span`. For each wrapper
type, the SQLx encoding traits are implemented. (Except, with `Span`,
only the decoding trait is implemented.)

This is similar to #141, but organizes things a bit differently. This
also comes with SQLite support. MySQL support is missing since it seems,
at present, to require exposing APIs in SQLx for a correct
implementation.

This initial implementation also omits `Zoned` entirely. I've left a
comment in the source code explaining why. The quick summary is that, at
least for PostgreSQL, I don't see a way to provide support for it
without either silently losing data (the time zone) or just storing it
as an RFC 9557 timestamp in a `TEXT` field. The downside of the latter
is that it doesn't use PostgreSQL native datetime types. (Becuase we
can't. Because PostgreSQL doesn't support storing anything other than
civil time and timestamps with respect to its datetime types.) I do
personally lean toward just using RFC 9557 as a `TEXT` type, but I'd
like to collect real use cases first to make sure that's the right way
to go.

Ref #50, Closes #141
Ref launchbadge/sqlx#3487

.github/workflows/ci.yml

@@ -124,6 +124,24 @@ jobs:
     # - name: Run integration tests
       # run: cargo test --test integration
 
+  # This job tests that examples outside the workspace build.
+  #
+  # These are outside the workspace because their dependency graphs are
+  # absolutely ludicrous.
+  examples:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: stable
+    - name: Build sqlx-postgres example
+      run: cargo run --manifest-path ./examples/sqlx-postgres/Cargo.toml
+    - name: Run sqlx-sqlite example
+      run: cargo run --manifest-path ./examples/sqlx-sqlite/Cargo.toml
+
   # Generic testing for most cross targets. Some get special treatment in
   # other jobs.
   cross:

.vim/coc-settings.json

@@ -1,6 +1,8 @@
 {
   "rust-analyzer.linkedProjects": [
     "bench/Cargo.toml",
+    "examples/sqlx-postgres/Cargo.toml",
+    "examples/sqlx-sqlite/Cargo.toml",
     "Cargo.toml"
   ]
 }

Cargo.toml

@@ -32,10 +32,12 @@ include = [
 members = [
   "crates/jiff-cli",
   "crates/jiff-icu",
+  "crates/jiff-sqlx",
   "crates/jiff-tzdb",
   "crates/jiff-tzdb-platform",
   "examples/*",
 ]
+exclude = ["examples/sqlx-postgres", "examples/sqlx-sqlite"]
 
 # Features are documented in the "Crate features" section of the crate docs:
 # https://docs.rs/jiff/*/#crate-features

crates/jiff-icu/Cargo.toml

@@ -6,9 +6,9 @@ license = "Unlicense OR MIT"
 homepage = "https://github.com/BurntSushi/jiff/tree/master/crates/jiff-icu"
 repository = "https://github.com/BurntSushi/jiff"
 documentation = "https://docs.rs/jiff-icu"
-description = "The entire Time Zone Database embedded into your binary."
+description = "Conversion routines for Jiff and ICU4X."
 categories = ["date-and-time"]
-keywords = ["date", "time", "temporal", "zone", "iana"]
+keywords = ["date", "time", "temporal", "zone", "icu"]
 workspace = "../.."
 edition = "2021"
 rust-version = "1.70"

crates/jiff-sqlx/COPYING

@@ -0,0 +1,3 @@
+This project is dual-licensed under the Unlicense and MIT licenses.
+
+You may use this code under the terms of either license.

crates/jiff-sqlx/Cargo.toml

@@ -0,0 +1,34 @@
+[package]
+name = "jiff-sqlx"
+version = "0.0.1"  #:version
+authors = ["Andrew Gallant <jamslam@gmail.com>"]
+license = "Unlicense OR MIT"
+homepage = "https://github.com/BurntSushi/jiff/tree/master/crates/jiff-sqlx"
+repository = "https://github.com/BurntSushi/jiff"
+documentation = "https://docs.rs/jiff-sqlx"
+description = "Integration for Jiff in sqlx."
+categories = ["date-and-time"]
+keywords = ["date", "time", "jiff", "sqlx", "zone"]
+workspace = "../.."
+edition = "2021"
+rust-version = "1.70"
+include = ["/*.rs", "/*.dat", "COPYING", "LICENSE-MIT", "UNLICENSE"]
+
+[lib]
+name = "jiff_sqlx"
+bench = false
+path = "src/lib.rs"
+
+[features]
+default = []
+postgres = ["dep:sqlx-postgres"]
+sqlite = ["dep:sqlx-sqlite"]
+
+[dependencies]
+jiff = { path = "../..", default-features = false }
+sqlx-core = { version = "0.8.0", default-features = false }
+sqlx-postgres = { version = "0.8.0", default-features = false, optional = true }
+sqlx-sqlite = { version = "0.8.0", default-features = false, optional = true }
+
+[dev-dependencies]
+jiff = { path = "../..", default-features = true }

crates/jiff-sqlx/LICENSE-MIT

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Andrew Gallant
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

crates/jiff-sqlx/README.md

@@ -0,0 +1,7 @@
+jiff-icu
+========
+WIP
+
+### Documentation
+
+https://docs.rs/jiff-icu

crates/jiff-sqlx/UNLICENSE

@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>

crates/jiff-sqlx/src/lib.rs

@@ -0,0 +1,73 @@
+/*!
+This crate provides integration points for [Jiff](jiff) and [SQLx][sqlx].
+
+Examples can be found in the
+[examples directory of the Jiff repository][examples].
+
+# Organization
+
+This crates defines several types that wrap corresponding types in Jiff. Each
+wrapper type provides implementations of traits found in SQLx. For most types,
+these are the [`sqlx_core::types::Type`], [`sqlx_core::decode::Decode`] and
+[`sqlx_core::encode::Encode`] traits.
+
+The intended workflow is to use these wrapper types within your wire types for
+encoding and decoding data from databases such as PostgreSQL. The wrapper types
+own the logic for encoding and decoding the data in database specific formats.
+
+In order to the minimize the annoyance of wrapper types, the following
+conveniences are afforded:
+
+* A [`ToSqlx`] trait is provided. Several Jiff types implement this trait. The
+trait provides easy conversion to the corresponding wrapper type in this crate.
+* A concrete `to_jiff` method is provided on each wrapper type. For example,
+[`Timestamp::to_jiff`]. This method is the reverse of `ToSqlx`. This converts
+from the wrapper type to the corresponding Jiff type.
+* There are `From` trait implementations from the wrapper type to the
+corresponding Jiff type, and vice versa.
+
+# Database support
+
+At present, both PostgreSQL and SQLite are supported.
+
+Ideally, MySQL support would be present too, but it
+[appears impossible until SQLx exposes some APIs][sqlx-mysql-bunk].
+
+# Future
+
+This crate exists because there are generally only three ways to implement
+the necessary traits in SQLx:
+
+1. Make Jiff depend on SQLx, and implement the corresponding traits where
+Jiff's types are defined.
+2. Make SQLx depend on Jiff, and implement the corresponding traits where the
+traits are defined.
+3. Make a crate like this one with types that wrap Jiff's types, and implements
+the corresponding traits for the wrapper types.
+
+This was done because it seems inappropriate for a "lower level" crate like
+Jiff to depend on SQLx. And while it might be appropriate for SQLx to optionally
+depend on Jiff (like it does for [`chrono`] or [`time`]), at time of writing,
+Jiff is still early in its life. It's totally reasonable to wait for it to
+mature. Plus, the thought of three different datetime integrations is,
+admittedly, tough to stomach.
+
+In the future, it may be prudent for this crate to be upstreamed into SQLx
+itself.
+
+[sqlx]: https://docs.rs/sqlx/0.8
+[examples]: https://github.com/BurntSushi/jiff/tree/master/examples/uptime
+[`chrono`]: https://docs.rs/chrono
+[`time`]: https://docs.rs/time
+[sqlx-mysql-bunk]: https://github.com/launchbadge/sqlx/issues/3487#issuecomment-2641843693
+*/
+
+#![deny(missing_docs)]
+
+pub use self::wrappers::{Date, DateTime, Span, Time, Timestamp, ToSqlx};
+
+#[cfg(feature = "postgres")]
+mod postgres;
+#[cfg(feature = "sqlite")]
+mod sqlite;
+mod wrappers;