feat: add mysql database supporting

.github/workflows/rust.yml

@@ -31,6 +31,7 @@ jobs:
         with:
           path: ~/.cargo/registry
           key: ${{ runner.os }}-cargo-registry-${{ hashFiles('Cargo.lock') }}
+
       - name: Cache cargo index
         uses: actions/cache@v1
         with:
@@ -48,7 +49,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: -- --test-threads=1
+          args: --all-features -- --test-threads=1
 
   clippy:
     name: clippy (ubuntu-latest, stable)

.vscode/settings.json

@@ -2,5 +2,6 @@
     "cSpell.words": [
         "migra"
     ],
-    "editor.formatOnSave": true
+    "editor.formatOnSave": true,
+    "rust.all_features": true
 }

README.md

@@ -46,6 +46,7 @@ For more information about the commands, simply run `migra help`
 ### Supported databases
 
 - [x] Postgres
+- [x] MySQL
 
 
 ## License

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3'
+version: "3"
 
 services:
   postgres:
@@ -13,6 +13,22 @@ services:
     ports:
       - 6000:5432
 
+  mysql:
+    image: mysql
+    container_name: migra.mysql
+    command: --default-authentication-plugin=mysql_native_password
+    environment:
+      MYSQL_ROOT_PASSWORD: example
+      MYSQL_DATABASE: "migra_tests"
+      MYSQL_USER: "mysql"
+      MYSQL_PASSWORD: "mysql"
+    volumes:
+      - mysql_data:/var/lib/mysql
+    ports:
+      - 6001:3306
+
 volumes:
   postgres_data:
     driver: local
+  mysql_data:
+    driver: local

migra-cli/Cargo.toml

@@ -14,15 +14,17 @@ readme = "../README.md"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+cfg-if = "1.0"
 structopt = "0.3"
 serde = { version = "1.0", features = ["derive"] }
 toml = "0.5"
 chrono = "0.4"
-postgres = "0.19"
+postgres = { version = "0.19", optional = true }
+mysql = { version = "20.1", optional = true }
 dotenv = { version = "0.15", optional = true }
 
 [features]
-default = []
+default = ["postgres"]
 
 [badges]
 maintenance = { status = "actively-developed" }

migra-cli/src/config.rs

@@ -7,6 +7,23 @@ use std::{env, fs, io};
 pub(crate) const MIGRA_TOML_FILENAME: &str = "Migra.toml";
 pub(crate) const DEFAULT_DATABASE_CONNECTION_ENV: &str = "$DATABASE_URL";
 
+fn default_database_connection_env() -> String {
+    DEFAULT_DATABASE_CONNECTION_ENV.to_owned()
+}
+
+#[cfg(any(not(feature = "postgres"), not(feature = "mysql")))]
+macro_rules! please_install_with {
+    (feature $database_name:expr) => {
+        panic!(
+            r#"You cannot use migra for "{database_name}".
+You need to reinstall crate with "{database_name}" feature.
+
+cargo install migra-cli --features ${database_name}"#,
+            database_name = $database_name
+        );
+    };
+}
+
 #[derive(Debug, Serialize, Deserialize)]
 pub(crate) struct Config {
     #[serde(skip)]
@@ -19,30 +36,69 @@ pub(crate) struct Config {
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
 pub(crate) enum SupportedDatabaseClient {
+    #[cfg(feature = "postgres")]
     Postgres,
+    #[cfg(feature = "mysql")]
+    Mysql,
+}
+
+impl Default for SupportedDatabaseClient {
+    fn default() -> Self {
+        cfg_if! {
+            if #[cfg(feature = "postgres")] {
+                SupportedDatabaseClient::Postgres
+            } else if #[cfg(feature = "mysql")] {
+                SupportedDatabaseClient::Mysql
+            }
+        }
+    }
 }
 
 #[derive(Debug, Clone, Default, Serialize, Deserialize)]
 pub(crate) struct DatabaseConfig {
     pub client: Option<SupportedDatabaseClient>,
-    pub connection: Option<String>,
+
+    #[serde(default = "default_database_connection_env")]
+    pub connection: String,
 }
 
 impl DatabaseConfig {
-    pub fn client(&self) -> MigraResult<SupportedDatabaseClient> {
-        Ok(SupportedDatabaseClient::Postgres)
+    pub fn client(&self) -> SupportedDatabaseClient {
+        self.client.clone().unwrap_or_else(|| {
+            self.connection_string()
+                .ok()
+                .and_then(|connection_string| {
+                    if connection_string.starts_with("postgres://") {
+                        cfg_if! {
+                            if #[cfg(feature = "postgres")] {
+                                Some(SupportedDatabaseClient::Postgres)
+                            } else {
+                                please_install_with!(feature "postgres")
+                            }
+                        }
+                    } else if connection_string.starts_with("mysql://") {
+                        cfg_if! {
+                            if #[cfg(feature = "mysql")] {
+                                Some(SupportedDatabaseClient::Mysql)
+                            } else {
+                                please_install_with!(feature "mysql")
+                            }
+                        }
+                    } else {
+                        None
+                    }
+                })
+                .unwrap_or_default()
+        })
     }
 
     pub fn connection_string(&self) -> MigraResult<String> {
-        let connection = self
-            .connection
-            .clone()
-            .unwrap_or_else(|| String::from(DEFAULT_DATABASE_CONNECTION_ENV));
-        if let Some(connection_env) = connection.strip_prefix("$") {
+        if let Some(connection_env) = self.connection.strip_prefix("$") {
             env::var(connection_env).map_err(|_| Error::MissedEnvVar(connection_env.to_string()))
         } else {
-            Ok(connection)
+            Ok(self.connection.clone())
         }
     }
 }
@@ -53,7 +109,7 @@ impl Default for Config {
             manifest_root: PathBuf::default(),
             root: PathBuf::from("database"),
             database: DatabaseConfig {
-                connection: Some(String::from(DEFAULT_DATABASE_CONNECTION_ENV)),
+                connection: default_database_connection_env(),
                 ..Default::default()
             },
         }

migra-cli/src/database/clients/mod.rs

@@ -1,3 +1,13 @@
-mod postgres;
+cfg_if! {
+    if #[cfg(feature = "postgres")] {
+        mod postgres;
+        pub use self::postgres::*;
+    }
+}
 
-pub use self::postgres::*;
+cfg_if! {
+    if #[cfg(feature = "mysql")] {
+        mod mysql;
+        pub use self::mysql::*;
+    }
+}

migra-cli/src/database/clients/mysql.rs

@@ -0,0 +1,53 @@
+use crate::database::builder::merge_query_with_params;
+use crate::database::prelude::*;
+use crate::error::StdResult;
+use mysql::prelude::*;
+use mysql::{Pool, PooledConn};
+
+pub struct MySqlConnection {
+    pool: Pool,
+}
+
+impl MySqlConnection {
+    fn client(&self) -> StdResult<PooledConn> {
+        let conn = self.pool.get_conn()?;
+        Ok(conn)
+    }
+}
+
+impl OpenDatabaseConnection for MySqlConnection {
+    fn open(connection_string: &str) -> StdResult<Self> {
+        let pool = Pool::new(connection_string)?;
+        Ok(MySqlConnection { pool })
+    }
+}
+
+impl DatabaseConnection for MySqlConnection {
+    fn migration_table_stmt(&self) -> String {
+        r#"CREATE TABLE IF NOT EXISTS migrations (
+            id      int             AUTO_INCREMENT PRIMARY KEY,
+            name    varchar(256)    NOT NULL UNIQUE
+        )"#
+        .to_string()
+    }
+
+    fn batch_execute(&mut self, query: &str) -> StdResult<()> {
+        self.client()?.query_drop(query)?;
+        Ok(())
+    }
+
+    fn execute<'b>(&mut self, query: &str, params: ToSqlParams<'b>) -> StdResult<u64> {
+        let stmt = merge_query_with_params(query, params);
+
+        let res = self.client()?.query_first(stmt)?.unwrap_or_default();
+        Ok(res)
+    }
+
+    fn query<'b>(&mut self, query: &str, params: ToSqlParams<'b>) -> StdResult<Vec<Vec<String>>> {
+        let stmt = merge_query_with_params(query, params);
+
+        let res = self.client()?.query_map(stmt, |(column,)| vec![column])?;
+
+        Ok(res)
+    }
+}

migra-cli/src/database/clients/postgres.rs

@@ -15,6 +15,14 @@ impl OpenDatabaseConnection for PostgresConnection {
 }
 
 impl DatabaseConnection for PostgresConnection {
+    fn migration_table_stmt(&self) -> String {
+        r#"CREATE TABLE IF NOT EXISTS migrations (
+            id      serial      PRIMARY KEY,
+            name    text        NOT NULL UNIQUE
+        )"#
+        .to_string()
+    }
+
     fn batch_execute(&mut self, query: &str) -> StdResult<()> {
         self.client.batch_execute(query)?;
         Ok(())

migra-cli/src/database/connection.rs

@@ -10,6 +10,8 @@ pub trait OpenDatabaseConnection: Sized {
 }
 
 pub trait DatabaseConnection {
+    fn migration_table_stmt(&self) -> String;
+
     fn batch_execute(&mut self, query: &str) -> StdResult<()>;
 
     fn execute<'b>(&mut self, query: &str, params: ToSqlParams<'b>) -> StdResult<u64>;
@@ -26,13 +28,16 @@ impl DatabaseConnectionManager {
         config: &DatabaseConfig,
         connection_string: &str,
     ) -> StdResult<Self> {
-        let conn = match config.client()? {
-            SupportedDatabaseClient::Postgres => PostgresConnection::open(&connection_string)?,
+        let conn: AnyConnection = match config.client() {
+            #[cfg(feature = "postgres")]
+            SupportedDatabaseClient::Postgres => {
+                Box::new(PostgresConnection::open(&connection_string)?)
+            }
+            #[cfg(feature = "mysql")]
+            SupportedDatabaseClient::Mysql => Box::new(MySqlConnection::open(&connection_string)?),
         };
 
-        Ok(DatabaseConnectionManager {
-            conn: Box::new(conn),
-        })
+        Ok(DatabaseConnectionManager { conn })
     }
 
     pub fn connect(config: &DatabaseConfig) -> StdResult<Self> {

migra-cli/src/database/migration.rs

@@ -59,9 +59,12 @@ impl MigrationManager {
 }
 
 pub fn is_migrations_table_not_found<D: std::fmt::Display>(error: D) -> bool {
-    error
-        .to_string()
-        .contains(r#"relation "migrations" does not exist"#)
+    let error_message = error.to_string();
+
+    // Postgres error
+    error_message.contains(r#"relation "migrations" does not exist"#)
+        // MySQL error
+        || error_message.contains("ERROR 1146 (42S02)")
 }
 
 pub trait ManageMigration {
@@ -101,12 +104,8 @@ impl ManageMigration for MigrationManager {
     }
 
     fn create_migrations_table(&self, conn: &mut AnyConnection) -> StdResult<()> {
-        conn.batch_execute(
-            r#"CREATE TABLE IF NOT EXISTS migrations (
-                id      serial      PRIMARY KEY,
-                name    text        NOT NULL UNIQUE
-            )"#,
-        )
+        let stmt = conn.migration_table_stmt();
+        conn.batch_execute(&stmt)
     }
 
     fn insert_migration_info(&self, conn: &mut AnyConnection, name: &str) -> StdResult<u64> {

migra-cli/src/main.rs

@@ -1,6 +1,12 @@
 #![deny(clippy::all)]
 #![forbid(unsafe_code)]
 
+#[macro_use]
+extern crate cfg_if;
+
+#[cfg(not(any(feature = "postgres", feature = "mysql")))]
+compile_error!(r#"Either features "postgres" or "mysql" must be enabled for "migra" crate"#);
+
 mod commands;
 mod config;
 mod database;

migra-cli/tests/commands.rs

@@ -1,4 +1,5 @@
 pub use assert_cmd::prelude::*;
+pub use cfg_if::cfg_if;
 pub use predicates::str::contains;
 pub use std::process::Command;
 
@@ -6,12 +7,17 @@ pub type TestResult = std::result::Result<(), Box<dyn std::error::Error>>;
 
 pub const ROOT_PATH: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/data/");
 
-pub fn path_to_file(file_name: &'static str) -> String {
-    ROOT_PATH.to_owned() + file_name
+pub fn path_to_file<D: std::fmt::Display>(file_name: D) -> String {
+    format!("{}{}", ROOT_PATH, file_name)
+}
+
+pub fn database_manifest_path<D: std::fmt::Display>(database_name: D) -> String {
+    path_to_file(format!("Migra_{}.toml", database_name))
 }
 
 pub const DATABASE_URL_DEFAULT_ENV_NAME: &str = "DATABASE_URL";
-pub const DATABASE_URL_ENV_VALUE: &str = "postgres://postgres:postgres@localhost:6000/migra_tests";
+pub const POSTGRES_URL: &str = "postgres://postgres:postgres@localhost:6000/migra_tests";
+pub const MYSQL_URL: &str = "mysql://mysql:mysql@localhost:6001/migra_tests";
 
 pub struct Env {
     key: &'static str,
@@ -112,26 +118,37 @@ Pending migrations:
 
     #[test]
     fn empty_migration_list_with_db() -> TestResult {
-        let env = Env::new(DATABASE_URL_DEFAULT_ENV_NAME, DATABASE_URL_ENV_VALUE);
+        fn inner(connection_string: &'static str) -> TestResult {
+            let env = Env::new(DATABASE_URL_DEFAULT_ENV_NAME, connection_string);
 
-        Command::cargo_bin("migra")?
-            .arg("ls")
-            .assert()
-            .success()
-            .stdout(contains(
-                r#"Applied migrations:
+            Command::cargo_bin("migra")?
+                .arg("ls")
+                .assert()
+                .success()
+                .stdout(contains(
+                    r#"Applied migrations:
 —
 
 Pending migrations:
 —"#,
-            ));
+                ));
 
-        drop(env);
+            drop(env);
+
+            Ok(())
+        }
+
+        #[cfg(feature = "postgres")]
+        inner(POSTGRES_URL)?;
+
+        #[cfg(feature = "mysql")]
+        inner(MYSQL_URL)?;
 
         Ok(())
     }
 
     #[test]
+    #[cfg(feature = "postgres")]
     fn empty_migration_list_with_url_in_manifest() -> TestResult {
         Command::cargo_bin("migra")?
             .arg("-c")
@@ -151,8 +168,9 @@ Pending migrations:
     }
 
     #[test]
+    #[cfg(feature = "postgres")]
     fn empty_migration_list_with_env_in_manifest() -> TestResult {
-        let env = Env::new("DB_URL", DATABASE_URL_ENV_VALUE);
+        let env = Env::new("DB_URL", POSTGRES_URL);
 
         Command::cargo_bin("migra")?
             .arg("-c")
@@ -175,105 +193,127 @@ Pending migrations:
 
     #[test]
     fn empty_applied_migrations() -> TestResult {
-        let env = Env::new(DATABASE_URL_DEFAULT_ENV_NAME, DATABASE_URL_ENV_VALUE);
-
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("ls")
-            .assert()
-            .success()
-            .stdout(contains(
-                r#"Applied migrations:
+        fn inner(database_name: &'static str) -> TestResult {
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(database_manifest_path(database_name))
+                .arg("ls")
+                .assert()
+                .success()
+                .stdout(contains(
+                    r#"Applied migrations:
 —
 
 Pending migrations:
 210218232851_create_articles
 210218233414_create_persons
 "#,
-            ));
+                ));
 
-        drop(env);
+            Ok(())
+        }
+
+        #[cfg(feature = "postgres")]
+        inner("postgres")?;
+
+        #[cfg(feature = "mysql")]
+        inner("mysql")?;
 
         Ok(())
     }
 
     #[test]
     fn applied_all_migrations() -> TestResult {
-        let env = Env::new(DATABASE_URL_DEFAULT_ENV_NAME, DATABASE_URL_ENV_VALUE);
+        fn inner(database_name: &'static str) -> TestResult {
+            let manifest_path = database_manifest_path(database_name);
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("up")
-            .assert()
-            .success();
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("up")
+                .assert()
+                .success();
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("ls")
-            .assert()
-            .success()
-            .stdout(contains(
-                r#"Applied migrations:
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("ls")
+                .assert()
+                .success()
+                .stdout(contains(
+                    r#"Applied migrations:
 210218232851_create_articles
 210218233414_create_persons
 
 Pending migrations:
 —
 "#,
-            ));
+                ));
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("down")
-            .arg("--all")
-            .assert()
-            .success();
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("down")
+                .arg("--all")
+                .assert()
+                .success();
 
-        drop(env);
+            Ok(())
+        }
+
+        #[cfg(feature = "postgres")]
+        inner("postgres")?;
+
+        #[cfg(feature = "mysql")]
+        inner("mysql")?;
 
         Ok(())
     }
 
     #[test]
     fn applied_one_migrations() -> TestResult {
-        let env = Env::new(DATABASE_URL_DEFAULT_ENV_NAME, DATABASE_URL_ENV_VALUE);
+        fn inner(database_name: &'static str) -> TestResult {
+            let manifest_path = database_manifest_path(database_name);
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("up")
-            .arg("-n")
-            .arg("1")
-            .assert()
-            .success();
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("up")
+                .arg("-n")
+                .arg("1")
+                .assert()
+                .success();
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("ls")
-            .assert()
-            .success()
-            .stdout(contains(
-                r#"Applied migrations:
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("ls")
+                .assert()
+                .success()
+                .stdout(contains(
+                    r#"Applied migrations:
 210218232851_create_articles
 
 Pending migrations:
 210218233414_create_persons
 "#,
-            ));
+                ));
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("down")
-            .assert()
-            .success();
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("down")
+                .assert()
+                .success();
 
-        drop(env);
+            Ok(())
+        }
+
+        #[cfg(feature = "postgres")]
+        inner("postgres")?;
+
+        #[cfg(feature = "mysql")]
+        inner("mysql")?;
 
         Ok(())
     }
@@ -285,46 +325,56 @@ mod make {
 
     #[test]
     fn make_migration_directory() -> TestResult {
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_url.toml"))
-            .arg("make")
-            .arg("test")
-            .assert()
-            .success()
-            .stdout(contains("Structure for migration has been created in"));
+        fn inner(database_name: &'static str) -> TestResult {
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(database_manifest_path(database_name))
+                .arg("make")
+                .arg("test")
+                .assert()
+                .success()
+                .stdout(contains("Structure for migration has been created in"));
 
-        let entries = fs::read_dir(path_to_file("migrations"))?
-            .map(|entry| entry.map(|e| e.path()))
-            .collect::<Result<Vec<_>, std::io::Error>>()?;
+            let entries = fs::read_dir(path_to_file(format!("{}/migrations", database_name)))?
+                .map(|entry| entry.map(|e| e.path()))
+                .collect::<Result<Vec<_>, std::io::Error>>()?;
 
-        let dir_paths = entries
-            .iter()
-            .filter_map(|path| {
-                path.to_str().and_then(|path| {
-                    if path.ends_with("_test") {
-                        Some(path)
-                    } else {
-                        None
-                    }
+            let dir_paths = entries
+                .iter()
+                .filter_map(|path| {
+                    path.to_str().and_then(|path| {
+                        if path.ends_with("_test") {
+                            Some(path)
+                        } else {
+                            None
+                        }
+                    })
                 })
-            })
-            .collect::<Vec<_>>();
+                .collect::<Vec<_>>();
 
-        for dir_path in dir_paths.iter() {
-            let upgrade_content = fs::read_to_string(format!("{}/up.sql", dir_path))?;
-            let downgrade_content = fs::read_to_string(format!("{}/down.sql", dir_path))?;
+            for dir_path in dir_paths.iter() {
+                let upgrade_content = fs::read_to_string(format!("{}/up.sql", dir_path))?;
+                let downgrade_content = fs::read_to_string(format!("{}/down.sql", dir_path))?;
 
-            assert_eq!(upgrade_content, "-- Your SQL goes here\n\n");
+                assert_eq!(upgrade_content, "-- Your SQL goes here\n\n");
 
-            assert_eq!(
-                downgrade_content,
-                "-- This file should undo anything in `up.sql`\n\n"
-            );
+                assert_eq!(
+                    downgrade_content,
+                    "-- This file should undo anything in `up.sql`\n\n"
+                );
 
-            fs::remove_dir_all(dir_path)?;
+                fs::remove_dir_all(dir_path)?;
+            }
+
+            Ok(())
         }
 
+        #[cfg(feature = "postgres")]
+        inner("postgres")?;
+
+        #[cfg(feature = "mysql")]
+        inner("mysql")?;
+
         Ok(())
     }
 }
@@ -334,40 +384,66 @@ mod upgrade {
 
     #[test]
     fn applied_all_migrations() -> TestResult {
-        let env = Env::new(DATABASE_URL_DEFAULT_ENV_NAME, DATABASE_URL_ENV_VALUE);
+        fn inner<ValidateFn>(database_name: &'static str, validate: ValidateFn) -> TestResult
+        where
+            ValidateFn: Fn() -> TestResult,
+        {
+            let manifest_path = database_manifest_path(database_name);
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("up")
-            .assert()
-            .success();
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("up")
+                .assert()
+                .success();
 
-        let mut conn = postgres::Client::connect(DATABASE_URL_ENV_VALUE, postgres::NoTls)?;
-        let res = conn.query("SELECT p.id, a.id FROM persons AS p, articles AS a", &[])?;
+            validate()?;
 
-        assert_eq!(
-            res.into_iter()
-                .map(|row| (row.get(0), row.get(1)))
-                .collect::<Vec<(i32, i32)>>(),
-            Vec::new()
-        );
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("down")
+                .assert()
+                .success();
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("down")
-            .assert()
-            .success();
+            Command::cargo_bin("migra")?
+                .arg("-c")
+                .arg(&manifest_path)
+                .arg("down")
+                .assert()
+                .success();
 
-        Command::cargo_bin("migra")?
-            .arg("-c")
-            .arg(path_to_file("Migra_env.toml"))
-            .arg("down")
-            .assert()
-            .success();
+            Ok(())
+        }
 
-        drop(env);
+        #[cfg(feature = "postgres")]
+        inner("postgres", || {
+            let mut conn = postgres::Client::connect(POSTGRES_URL, postgres::NoTls)?;
+            let res = conn.query("SELECT p.id, a.id FROM persons AS p, articles AS a", &[])?;
+
+            assert_eq!(
+                res.into_iter()
+                    .map(|row| (row.get(0), row.get(1)))
+                    .collect::<Vec<(i32, i32)>>(),
+                Vec::new()
+            );
+
+            Ok(())
+        })?;
+
+        #[cfg(feature = "mysql")]
+        inner("mysql", || {
+            use mysql::prelude::*;
+
+            let pool = mysql::Pool::new(MYSQL_URL)?;
+            let mut conn = pool.get_conn()?;
+
+            let res = conn.query_drop("SELECT p.id, a.id FROM persons AS p, articles AS a")?;
+
+            assert_eq!(res, ());
+
+            Ok(())
+        })?;
 
         Ok(())
     }

migra-cli/tests/data/Migra_env.toml

@@ -1,4 +1,4 @@
-root = "./"
+root = "./postgres"
 
 [database]
 connection = "$DATABASE_URL"

migra-cli/tests/data/Migra_mysql.toml

@@ -0,0 +1,4 @@
+root = "./mysql"
+
+[database]
+connection = "mysql://mysql:mysql@localhost:6001/migra_tests"

migra-cli/tests/data/Migra_postgres.toml

@@ -1,4 +1,4 @@
-root = "./"
+root = "./postgres"
 
 [database]
 connection = "postgres://postgres:postgres@localhost:6000/migra_tests"

migra-cli/tests/data/mysql/migrations/210218232851_create_articles/up.sql

@@ -0,0 +1,8 @@
+-- Your SQL goes here
+
+CREATE TABLE articles (
+    id          int         AUTO_INCREMENT PRIMARY KEY,
+    title       text        NOT NULL CHECK (length(title) > 0),
+    content     text        NOT NULL,
+    created_at  timestamp   NOT NULL DEFAULT current_timestamp
+);

migra-cli/tests/data/mysql/migrations/210218233414_create_persons/up.sql

@@ -0,0 +1,12 @@
+-- Your SQL goes here
+
+CREATE TABLE persons (
+    id              int             AUTO_INCREMENT PRIMARY KEY,
+    email           varchar(256)    NOT NULL UNIQUE,
+    display_name    text            NOT NULL,
+    created_at      timestamp       NOT NULL DEFAULT current_timestamp
+);
+
+ALTER TABLE articles
+    ADD COLUMN author_person_id int NULL
+        REFERENCES persons (id) ON UPDATE CASCADE ON DELETE CASCADE;

migra-cli/tests/data/postgres/migrations/210218232851_create_articles/down.sql

@@ -0,0 +1,3 @@
+-- This file should undo anything in `up.sql`
+
+DROP TABLE articles;

migra-cli/tests/data/postgres/migrations/210218233414_create_persons/down.sql

@@ -0,0 +1,6 @@
+-- This file should undo anything in `up.sql`
+
+ALTER TABLE articles
+    DROP COLUMN author_person_id;
+
+DROP TABLE persons;