You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: repository.rs
    path of file: ./repos/aws-sdk-rust/examples/cross_service/rest_ses/src/work_item
    
    the code of the file until where you have to start completion: // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

//! The repository module includes data access components. It exposes Create,
//! Retrieve, List, Update, and Delete functions that work with an `&RdsClient`
//! to execute SQL that manages WorkItem persistence. Its interface encapsulates
//! RDS and data parsing errors behind the WorkItemError enum defined in the
/
    
pub async fn retrieve(id: String, client: &RdsClient) -> Result<WorkItem, WorkItemError> {
    let statement = client
        .execute_statement()
        .sql(format!(
            r#"SELECT {FIELDS} FROM Work WHERE idwork = :idwork;"#
        ))
        .set_parameters(params![("idwork", id)])
        .format_records_as(RecordsFormatType::Json)
        .send()
        .await;

    let items = parse_rds_output(statement)?;

    if items.len() > 1 {
        // Warn on too many records.
        tracing::warn!("Received multiple results for id: {id}");
    }

    // Check that there are enough records.
    if items.is_empty() {
        return Err(WorkItemError::MissingItem(id.clone()));
    }

    // Last chance for something to go wrong!
    let item = match items.get(0) {
        Some(item) => Ok(item),
        None => Err(WorkItemError::Other(
            "Somehow len() == 1 but get(0) is None".to_string(),
        )),
    }?;

    Ok(item.to_owned())
}