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DataAcc

sabi

Trait DataAcc 

Source 
pub trait DataAcc {
    // Required method
    fn get_data_conn<C: DataConn + 'static>(
        &mut self,
        name: &str,
    ) -> Result<&mut C>;
}
Expand description

This trait provides a mechanism to retrieve a mutable reference to a DataConn object by name, creating it if necessary.

It is typically implemented as a derived trait with default methods (using the override_macro crate) on DataHub, allowing application logic to interact with data services through an abstract interface.

Required Methods§

Source

fn get_data_conn<C: DataConn + 'static>(&mut self, name: &str) -> Result<&mut C>

Retrieves a mutable reference to a DataConn object by name, creating it if necessary.

This is the core method used by DataAcc implementations to obtain connections to external data services. It first checks if a DataConn with the given name already exists in the current session. If not, it attempts to find a corresponding DataSrc and create a new DataConn from it.

§Type Parameters
  • C: The concrete type of DataConn expected.
§Parameters
  • name: The name of the data source/connection to retrieve.
§Returns
  • errs::Result<&mut C>: A mutable reference to the DataConn instance if successful, or an errs::Err if the data source is not found, or if the retrieved/created DataConn cannot be cast to the specified type C.

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§