使用 sqlx 操作 PostgreSQL 数组

数据表定义

CREATE TABLE IF NOT EXISTS "posts"(
    "id" SERIAL PRIMARY KEY,
    "content" VARCHAR(255) NOT NULL,
    "images" VARCHAR(50)[] NOT NULL DEFAULT '{}'::VARCHAR(50)[]
);

• content：内容
• images：图片，数据类型为varchar(50)的数组。默认值为空数组

模型定义

// src/post/model.rs

#[derive(Default, Serialize, Deserialize, FromRow)]
pub struct Post {
    pub id: i32,
    pub content: String,
    pub images: Vec<String>,
}

• PostgreSQL 中的数组可以直接和 Rust 的 Vec 进行映射

数据操作

handler

// src/post/handler.rs

#[derive(Deserialize)]
pub struct CreateForm {
    content: String,
    images: Vec<String>,
}
pub async fn create(
    State(state): State<ArcAppState>,
    Json(frm): Json<CreateForm>,
) -> Result<Json<i32>> {
    let id = model::create(
        &state.pool,
        &model::Post {
            content: frm.content,
            images: frm.images,
            ..Default::default()
        },
    )
    .await?;

    Ok(Json(id))
}

pub async fn find(
    State(state): State<ArcAppState>,
    Path(id): Path<i32>,
) -> Result<Json<model::Post>> {
    let post = match model::find(&state.pool, id).await? {
        Some(v) => v,
        None => return Err(Error::new("不存在的记录")),
    };

    Ok(Json(post))
}

测试

// rest/post.http

## 新建
POST http://127.0.0.1:9527/post
Content-Type: application/json

{
    "content":"sqlx 操作 postgreSQL",
    "images":["foo.png", "bar.png", "foobar.jpg"]
}

## 查找
GET http://127.0.0.1:9527/post/1
Content-Type: application/json