Struct polars_sql::SQLContext

pub struct SQLContext {
    pub table_map: PlHashMap<String, LazyFrame>,
}

Fields

table_map: PlHashMap<String, LazyFrame>

Implementations

impl SQLContext

pub fn try_new() -> PolarsResult<Self>

pub fn register(&mut self, name: &str, lf: LazyFrame)

pub fn execute_statement(&self, stmt: &Statement) -> PolarsResult<LazyFrame>

Examples found in repository

src/context.rs (line 233)

    pub fn execute(&self, query: &str) -> PolarsResult<LazyFrame> {
        let ast = Parser::parse_sql(&GenericDialect::default(), query)
            .map_err(|e| PolarsError::ComputeError(format!("{:?}", e).into()))?;
        if ast.len() != 1 {
            return Err(PolarsError::ComputeError(
                "One and only one statement at a time please".into(),
            ));
        }

        let ast = ast.get(0).unwrap();
        return self.execute_statement(ast);
    }

pub fn execute(&self, query: &str) -> PolarsResult<LazyFrame>

Trait Implementations

impl Clone for SQLContext

fn clone(&self) -> SQLContext

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Default for SQLContext

fn default() -> SQLContext

Returns the “default value” for a type.

impl Drop for SQLContext

fn drop(&mut self)

Executes the destructor for this type.