148 lines
3.1 KiB
Markdown
148 lines
3.1 KiB
Markdown
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# 慧添翼考试
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## 启动数据库
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```bash
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$ pg_ctl -D /usr/local/var/postgres start
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```
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## 创建数据库
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```bash
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$ psql postgres
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postgres=# create database htyws owner hty encoding utf8;
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CREATE DATABASE
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postgres=# \q
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```
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## 创建用户
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```bash
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postgres=# create user hty;
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CREATE ROLE
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```
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## 改变数据库owner
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```bash
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postgres=# alter database htyws owner to hty;
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ALTER DATABASE
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postgres=#
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```
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## 改变tables的owner
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```bash
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htyws=# \dt
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List of relations
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Schema | Name | Type | Owner
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--------+----------------------------+-------+-------
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public | __diesel_schema_migrations | table | htyws
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public | rewards | table | weli
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public | users | table | weli
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(3 rows)
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```
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```bash
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htyws=# alter table __diesel_schema_migrations owner to htyws;
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ALTER TABLE
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htyws=# alter table rewards owner to htyws;
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ALTER TABLE
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htyws=# alter table users owner to htyws;
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ALTER TABLE
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```
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```bash
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htyws=# \dt
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List of relations
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Schema | Name | Type | Owner
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--------+----------------------------+-------+-------
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public | __diesel_schema_migrations | table | htyws
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public | rewards | table | htyws
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public | users | table | htyws
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(3 rows)
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htyws=#
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```
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## 安装diesel_cli
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```bash
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$ cargo install diesel_cli --no-default-features --features postgres
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```
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## 初始化项目过程（已完成）
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创建`.env`文件：
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```bash
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$ echo "DATABASE_URL=postgres://weli@localhost/htyws" > .env
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```
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里面是diesel要使用的数据库相关信息，上面就放数据库连接地址。
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```bash
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$ diesel setup
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Creating migrations directory at: /Users/weli/works/htyws/migrations
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```
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## 创建用户表（初步工作完成）
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创建第一个migration，创建一张`users`表：
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```bash
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$ diesel migration generate create_users
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Creating migrations/2020-09-27-112838_create_users/up.sql
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Creating migrations/2020-09-27-112838_create_users/down.sql
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```
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在`up.sql`里面添加内容：
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```sql
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CREATE TABLE users (
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id SERIAL PRIMARY KEY,
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nickname VARCHAR UNIQUE NOT NULL
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)
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```
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执行migration：
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```bash
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$ diesel migration run 19:20:27
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Running migration 2020-09-27-112838_create_users
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```
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数据库表可以看到已经创建：
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```bash
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postgres=# \c htyws
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You are now connected to database "htyws" as user "weli".
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htyws=# \dt
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List of relations
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Schema | Name | Type | Owner
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--------+----------------------------+-------+-------
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public | __diesel_schema_migrations | table | weli
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public | users | table | weli
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(2 rows)
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htyws=# select * from users;
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id | nickname
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----+----------
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(0 rows)
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htyws=#
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```
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## 生成/更新schema文件（每次重构要做）
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使用`diesel`的命令更新`schema.rs`（在项目根目录执行）：
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```bash
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$ diesel print-schema > src/schema.rs
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```
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