diff --git a/__database/diesel/.env b/__database/diesel/.env
new file mode 100644
index 0000000..932c7d6
--- /dev/null
+++ b/__database/diesel/.env
@@ -0,0 +1,2 @@
+DATABASE_URL=file:test.db
+
diff --git a/__database/diesel/Cargo.lock b/__database/diesel/Cargo.lock
new file mode 100644
index 0000000..805deb6
--- /dev/null
+++ b/__database/diesel/Cargo.lock
@@ -0,0 +1,100 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "byteorder"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae44d1a3d5a19df61dd0c8beb138458ac2a53a7ac09eba97d55592540004306b"
+
+[[package]]
+name = "diesel"
+version = "0.1.0"
+dependencies = [
+ "diesel 1.4.5",
+ "dotenv",
+]
+
+[[package]]
+name = "diesel"
+version = "1.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e2de9deab977a153492a1468d1b1c0662c1cf39e5ea87d0c060ecd59ef18d8c"
+dependencies = [
+ "byteorder",
+ "diesel_derives",
+ "libsqlite3-sys",
+]
+
+[[package]]
+name = "diesel_derives"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "45f5098f628d02a7a0f68ddba586fb61e80edec3bdc1be3b921f4ceec60858d3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "dotenv"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77c90badedccf4105eca100756a0b1289e191f6fcbdadd3cee1d2f614f97da8f"
+
+[[package]]
+name = "libsqlite3-sys"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e704a02bcaecd4a08b93a23f6be59d0bd79cd161e0963e9499165a0a35df7bd"
+dependencies = [
+ "pkg-config",
+ "vcpkg",
+]
+
+[[package]]
+name = "pkg-config"
+version = "0.3.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c700597eca8a5a762beb35753ef6b94df201c81cca676604f547495a0d7f0081"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "vcpkg"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b00bca6106a5e23f3eee943593759b7fcddb00554332e856d990c893966879fb"
diff --git a/__database/diesel/Cargo.toml b/__database/diesel/Cargo.toml
new file mode 100644
index 0000000..420acd2
--- /dev/null
+++ b/__database/diesel/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "diesel"
+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]
+diesel = { version = "1.4.5", features = ["sqlite"] }
+dotenv = "0.15.0"
+
diff --git a/__database/diesel/README.md b/__database/diesel/README.md
new file mode 100644
index 0000000..d1c5846
--- /dev/null
+++ b/__database/diesel/README.md
@@ -0,0 +1,10 @@
+!!NOT WORKS...
+
+cargo install diesel_cli --no-default-features --features sqlite
+
+
+diesel setup --database-url=file:test.db
+
+diesel migration generate create_posts
+
+diesel migration run --database-url=file:test.db
diff --git a/__database/diesel/diesel.toml b/__database/diesel/diesel.toml
new file mode 100644
index 0000000..92267c8
--- /dev/null
+++ b/__database/diesel/diesel.toml
@@ -0,0 +1,5 @@
+# For documentation on how to configure this file,
+# see diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/schema.rs"
diff --git a/__database/diesel/migrations/.gitkeep b/__database/diesel/migrations/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/__database/diesel/migrations/2021-02-12-145106_create_posts/down.sql b/__database/diesel/migrations/2021-02-12-145106_create_posts/down.sql
new file mode 100644
index 0000000..fbf0d67
--- /dev/null
+++ b/__database/diesel/migrations/2021-02-12-145106_create_posts/down.sql
@@ -0,0 +1,4 @@
+-- This file should undo anything in `up.sql`
+DROP TABLE posts
+
+
diff --git a/__database/diesel/migrations/2021-02-12-145106_create_posts/up.sql b/__database/diesel/migrations/2021-02-12-145106_create_posts/up.sql
new file mode 100644
index 0000000..c554515
--- /dev/null
+++ b/__database/diesel/migrations/2021-02-12-145106_create_posts/up.sql
@@ -0,0 +1,8 @@
+-- Your SQL goes here
+CREATE TABLE posts (
+  id INTEGER PRIMARY KEY,
+  title VARCHAR NOT NULL,
+  body TEXT NOT NULL,
+  published BOOLEAN NOT NULL DEFAULT 'f'
+)
+
diff --git a/__database/diesel/src/main.rs b/__database/diesel/src/main.rs
new file mode 100644
index 0000000..9d0e90e
--- /dev/null
+++ b/__database/diesel/src/main.rs
@@ -0,0 +1,37 @@
+#[macro_use]
+extern crate diesel;
+
+pub mod schema;
+pub mod models;
+
+use diesel::prelude::*;
+use diesel::sqlite::SqliteConnection;
+use dotenv::dotenv;
+use std::env;
+use crate::models::Post;
+
+fn main() {
+    use crate::schema::posts::dsl::*;
+
+    let connection = establish_connection();
+    let results = posts.filter(published.eq(true))
+        .limit(5)
+        .load::<Post>(&connection)
+        .expect("Error loading posts");
+
+    println!("Displaying {} posts", results.len());
+    for post in results {
+        println!("{}", post.title);
+        println!("----------\n");
+        println!("{}", post.body);
+    }
+}
+
+pub fn establish_connection() -> SqliteConnection {
+    dotenv().ok();
+
+    let database_url = env::var("DATABASE_URL")
+        .expect("DATABASE_URL must be set");
+    SqliteConnection::establish(&database_url)
+        .expect(&format!("Error connecting to {}", database_url))
+}
\ No newline at end of file
diff --git a/__database/diesel/src/models.rs b/__database/diesel/src/models.rs
new file mode 100644
index 0000000..9bee09a
--- /dev/null
+++ b/__database/diesel/src/models.rs
@@ -0,0 +1,7 @@
+#[derive(Queryable)]
+pub struct Post {
+    pub id: i32,
+    pub title: String,
+    pub body: String,
+    pub published: bool,
+}
\ No newline at end of file
diff --git a/__database/diesel/src/schema.rs b/__database/diesel/src/schema.rs
new file mode 100644
index 0000000..a9c6c8b
--- /dev/null
+++ b/__database/diesel/src/schema.rs
@@ -0,0 +1,8 @@
+table! {
+    posts (id) {
+        id -> Nullable<Integer>,
+        title -> Text,
+        body -> Text,
+        published -> Bool,
+    }
+}
diff --git a/__database/diesel/test.db b/__database/diesel/test.db
new file mode 100644
index 0000000..09f547c
Binary files /dev/null and b/__database/diesel/test.db differ