feat: add barrel

__database/barrel/Cargo.lock

@@ -0,0 +1,14 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "barrel"
+version = "0.1.0"
+dependencies = [
+ "barrel 0.6.5",
+]
+
+[[package]]
+name = "barrel"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d67c978b1322c8031145b1f6c236fc371292f52c565bc96018b2971afcbffe1"

__database/barrel/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "barrel"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+barrel = { version = "0.6.5", features = [ "pg", "mysql", "sqlite3" ] }
+

__database/barrel/src/main.rs

@@ -0,0 +1,19 @@
+use barrel::{types, Migration};
+use barrel::backend::Pg;
+use barrel::backend::MySql;
+use barrel::backend::Sqlite;
+
+fn main() {
+    let mut m = Migration::new();
+
+    m.create_table("users", |t| {
+        t.add_column("name", types::varchar(255));
+        t.add_column("age", types::integer().nullable(true));
+        t.add_column("owns_plushy_sharks", types::boolean().nullable(true));
+    });
+
+    println!("{}", m.make::<Pg>());
+    println!("{}", m.make::<MySql>());
+    println!("{}", m.make::<Sqlite>());
+}
+