Struct Cmd 

pub struct Cmd { /* private fields */ }

A command-execution datasource.

Cheap to clone (everything is Arc-backed). The command and env here are the locked defaults; individual tables can be registered with their own CmdSpec overrides via Cmd::with_table.

Implementations

impl Cmd

pub fn new(command: impl Into<Arc<str>>) -> Self

Build a datasource locked to command (e.g. "aws").

pub fn with_env(self, key: impl Into<String>, value: impl Into<String>) -> Self

Declare a datasource-level env var, passed to every table’s child process unless a table overrides it.

pub fn with_pass_path(self, pass_path: bool) -> Self

Whether to forward PATH/HOME from the current process so the command can be located. Defaults to true; set false to require an absolute command path and a fully-declared environment.

pub fn with_script( self, name: impl Into<String>, script: impl Into<Arc<str>>, ) -> Self

Register a script under name with no overrides.

pub fn with_table(self, name: impl Into<String>, spec: CmdSpec) -> Self

Register a fully-specified CmdSpec under name.

pub fn command(&self) -> &str

The locked default command.

pub fn vista_factory(&self) -> CmdVistaFactory

A Vista factory bound to this datasource.

Trait Implementations

impl Clone for Cmd

fn clone(&self) -> Cmd

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl DataSource for Cmd

impl Debug for Cmd

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ExprDataSource<Value> for Cmd

async fn execute(&self, expr: &Expression<CborValue>) -> Result<CborValue>

fn defer(&self, expr: Expression<CborValue>) -> DeferredFn<CborValue>

fn associate<R>( &self, expr: Expression<T>, ) -> AssociatedExpression<'_, Self, T, R>

where Self: Sized,

Create an associated expression with type-safe return type

impl TableSource for Cmd

type Column<Type> = Column<Type> where Type: ColumnType

type AnyType = Value

type Value = Value

type Id = String

type Condition = CmdCondition

The condition type stored by Table. SQL/SurrealDB backends use Expression<Self::Value>; document-oriented backends like MongoDB can use a native filter type (e.g. bson::Document).

type Source = String

How this backend names its source. Most backends use String; SQL/SurrealDB backends use SelectSource<Self::Select> so a table can be sourced from an arbitrary sub-SELECT. See crate::source.

fn eq_condition(field: &str, value: &str) -> Result<Self::Condition>

Build a textual field == value condition.

fn eq_value_condition( &self, field: &str, value: Self::Value, ) -> Result<Self::Condition>

Build a field == value condition with a typed Self::Value.

fn create_column<Type: ColumnType>(&self, name: &str) -> Self::Column<Type>

Create a new column with the given name

fn to_any_column<Type: ColumnType>( &self, column: Self::Column<Type>, ) -> Self::Column<Self::AnyType>

Convert a typed column to type-erased column

fn convert_any_column<Type: ColumnType>( &self, any_column: Self::Column<Self::AnyType>, ) -> Option<Self::Column<Type>>

Attempt to convert a type-erased column back to typed column

fn expr( &self, template: impl Into<String>, parameters: Vec<ExpressiveEnum<Self::Value>>, ) -> Expression<Self::Value>

Create an expression from a template and parameters, similar to Expression::new

fn search_table_condition<E>( &self, _table: &Table<Self, E>, search_value: &str, ) -> Self::Condition

where E: Entity<Self::Value>,

Create a search condition for a table (e.g., searches across searchable fields)

fn list_table_values<'life0, 'life1, 'async_trait, E>( &'life0 self, table: &'life1 Table<Self, E>, ) -> Pin<Box<dyn Future<Output = Result<IndexMap<Self::Id, Record<Self::Value>>>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Get all data from a table as Record values with IDs (for ReadableValueSet implementation)

fn get_table_value<'life0, 'life1, 'life2, 'async_trait, E>( &'life0 self, table: &'life1 Table<Self, E>, id: &'life2 Self::Id, ) -> Pin<Box<dyn Future<Output = Result<Option<Record<Self::Value>>>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Get a single record by ID as Record value (for ReadableValueSet implementation).

fn get_table_some_value<'life0, 'life1, 'async_trait, E>( &'life0 self, table: &'life1 Table<Self, E>, ) -> Pin<Box<dyn Future<Output = Result<Option<(Self::Id, Record<Self::Value>)>>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Get some data from a table as Record value with ID (for ReadableValueSet implementation)

fn get_table_count<'life0, 'life1, 'async_trait, E>( &'life0 self, table: &'life1 Table<Self, E>, ) -> Pin<Box<dyn Future<Output = Result<i64>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Get count of records in the table

fn get_table_sum<'life0, 'life1, 'life2, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, _column: &'life2 Self::Column<Self::AnyType>, ) -> Pin<Box<dyn Future<Output = Result<Self::Value>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Get sum of a column in the table (returns native value type)

fn get_table_max<'life0, 'life1, 'life2, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, _column: &'life2 Self::Column<Self::AnyType>, ) -> Pin<Box<dyn Future<Output = Result<Self::Value>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Get maximum value of a column in the table (returns native value type)

fn get_table_min<'life0, 'life1, 'life2, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, _column: &'life2 Self::Column<Self::AnyType>, ) -> Pin<Box<dyn Future<Output = Result<Self::Value>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Get minimum value of a column in the table (returns native value type)

fn insert_table_value<'life0, 'life1, 'life2, 'life3, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, _id: &'life2 Self::Id, _record: &'life3 Record<Self::Value>, ) -> Pin<Box<dyn Future<Output = Result<Record<Self::Value>>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait,

Insert a record as Record value (for WritableValueSet implementation)

fn replace_table_value<'life0, 'life1, 'life2, 'life3, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, _id: &'life2 Self::Id, _record: &'life3 Record<Self::Value>, ) -> Pin<Box<dyn Future<Output = Result<Record<Self::Value>>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait,

Replace a record as Record value (for WritableValueSet implementation)

fn patch_table_value<'life0, 'life1, 'life2, 'life3, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, _id: &'life2 Self::Id, _partial: &'life3 Record<Self::Value>, ) -> Pin<Box<dyn Future<Output = Result<Record<Self::Value>>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait,

Patch a record as Record value (for WritableValueSet implementation)

fn delete_table_value<'life0, 'life1, 'life2, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, _id: &'life2 Self::Id, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Delete a record by ID (for WritableValueSet implementation)

fn delete_table_all_values<'life0, 'life1, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Delete all records (for WritableValueSet implementation)

fn insert_table_return_id_value<'life0, 'life1, 'life2, 'async_trait, E>( &'life0 self, _table: &'life1 Table<Self, E>, _record: &'life2 Record<Self::Value>, ) -> Pin<Box<dyn Future<Output = Result<Self::Id>> + Send + 'async_trait>>

where E: Entity<Self::Value> + 'async_trait, Self: Sized + 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Insert a record and return generated ID (for InsertableValueSet implementation)

fn related_in_condition<SourceE: Entity<Self::Value> + 'static>( &self, target_field: &str, source_table: &Table<Self, SourceE>, source_column: &str, ) -> Self::Condition

where Self: Sized,

Build a condition for “target_field IN (values of source_column from source_table)”.

fn column_table_values_expr<'a, E, Type: ColumnType>( &'a self, table: &Table<Self, E>, column: &Self::Column<Type>, ) -> AssociatedExpression<'a, Self, Self::Value, Vec<Type>>

where E: Entity<Self::Value> + 'static, Self: Sized,

Return an associated expression that, when resolved, yields all values of the given typed column from this table (respecting current conditions).

fn stream_table_values<'a, E>( &'a self, table: &Table<Self, E>, ) -> Pin<Box<dyn Stream<Item = Result<(Self::Id, Record<Self::Value>), VantageError>> + Send + 'a>>

where E: Entity<Self::Value> + 'a, Self: Sized,

Stream all records from a table as (Id, Record) pairs.

fn related_correlated_condition( &self, target_table: &str, target_field: &str, source_table: &str, source_column: &str, ) -> Self::Condition

Build a correlated condition: target_table.target_field = source_table.source_column.