SurrealDB CREATE SELECT in different ways

---

examples/surrealdb/create-select/Cargo.toml

[package]
name = "create-select"
version = "0.1.0"
edition = "2021"

[dependencies]
surrealdb = { version = "2.0", features = ["kv-mem"] }
serde = { version = "1.0", features = ["derive"] }
tokio = { version = "1.35", features = ["macros", "rt-multi-thread"] }

examples/surrealdb/create-select/src/main.rs

use serde::{Deserialize, Serialize};
use surrealdb::engine::local::{Db, Mem};
use surrealdb::opt::Resource;
use surrealdb::sql::Id;
use surrealdb::{RecordId, RecordIdKey, Surreal};

#[derive(Debug, Serialize, Deserialize)]
struct Message {
    text: String,
}

#[derive(Debug, Serialize, Deserialize)]
struct MessageWithId {
    text: String,
    id: RecordId,
}

#[derive(Debug, Serialize, Deserialize)]
struct MessageWithOptionalId {
    text: String,
    id: Option<RecordId>,
}

#[tokio::main]
async fn main() -> surrealdb::Result<()> {
    let db = Surreal::new::<Mem>(()).await?;

    db.use_ns("demo").use_db("demo-2").await?;

    add_message_using_struct_without_id(&db, "A message").await?;
    add_message_using_struct_without_id_using_resource(&db, "B message").await?;
    add_message_using_struct_with_id(&db, "C message").await?;
    add_message_using_struct_with_optional_id(&db, "D message").await?;
    add_message_using_query_without_id(&db, "E message").await?;

    let messages = get_all(&db).await?;
    for message in &messages {
        println!("{:?}", message);
    }
    assert_eq!(messages.len(), 5);
    assert_eq!(messages[0].text, "A message");
    assert_eq!(messages[1].text, "B message");
    assert_eq!(messages[2].text, "C message");
    assert_eq!(messages[3].text, "D message");
    assert_eq!(messages[4].text, "E message");

    Ok(())
}

async fn get_all(dbh: &Surreal<Db>) -> surrealdb::Result<Vec<MessageWithId>> {
    let mut response = dbh.query("SELECT * from messages ORDER BY text").await?;
    let messages: Vec<MessageWithId> = response.take(0)?;

    Ok(messages)
}

async fn add_message_using_struct_without_id(
    db: &Surreal<Db>,
    text: &str,
) -> surrealdb::Result<()> {
    let message = Message {
        text: text.to_owned(),
    };

    let result: Option<MessageWithId> = db.create("messages").content(message).await?;
    println!("{:?}", result);
    assert!(result.is_some());
    assert_eq!(result.unwrap().text, text);

    Ok(())
}

async fn add_message_using_struct_without_id_using_resource(
    db: &Surreal<Db>,
    text: &str,
) -> surrealdb::Result<()> {
    let message = Message {
        text: text.to_owned(),
    };

    let result: surrealdb::Value = db
        .create(Resource::from("messages"))
        .content(message)
        .await?;
    println!("{:?}", result);
    //assert_eq!(result.unwrap().text, text);

    Ok(())
}

async fn add_message_using_struct_with_id(db: &Surreal<Db>, text: &str) -> surrealdb::Result<()> {
    let id = RecordId::from_table_key("messages", RecordIdKey::from(Id::ulid().to_string()));

    let message = MessageWithId {
        id,
        text: text.to_owned(),
    };

    let result: Option<MessageWithId> = db.create("messages").content(message).await?;
    println!("{:?}", result);
    assert!(result.is_some());
    assert_eq!(result.unwrap().text, text);

    Ok(())
}

async fn add_message_using_struct_with_optional_id(
    db: &Surreal<Db>,
    text: &str,
) -> surrealdb::Result<()> {
    let message = MessageWithOptionalId {
        id: None,
        text: text.to_owned(),
    };

    let result: Option<MessageWithId> = db.create("messages").content(message).await?;
    println!("{:?}", result);
    assert!(result.is_some());
    assert_eq!(result.unwrap().text, text);

    Ok(())
}

async fn add_message_using_query_without_id(db: &Surreal<Db>, text: &str) -> surrealdb::Result<()> {
    let response = db
        .query("CREATE messages SET  text=$text")
        .bind(("text", text.to_owned()))
        .await?;

    println!("{:?}", response);
    // assert!(result.is_some());
    // assert_eq!(result.unwrap().text, text);

    Ok(())
}