Method

executeQuery(_:arguments:)

Executes a query and returns its result.

@MainActor func executeQuery(_ query: MTLQuery, arguments: [(any EcoreValue)?]) async throws -> (any EcoreValue)?

Parameters

query: The query to execute
arguments: The arguments matching the query parameters

Return Value

The query result, or nil if the result is null

Discussion

Queries are side-effect-free operations that compute values from model elements without generating text output.

Example

let query = MTLQuery(
    name: "isPublic",
    parameters: [MTLVariable(name: "element", type: "Element")],
    returnType: "Boolean",
    body: MTLExpression(/* element.visibility = 'public' */)
)

let result = try await generator.executeQuery(query, arguments: [element])
if let isPublic = result as? Bool, isPublic {
    print("Element is public")
}