Trait Schema 

pub trait Schema {
    // Required methods
    fn dialect(&self) -> Option<DialectType>;
    fn add_table(
        &mut self,
        table: &str,
        columns: &[(String, DataType)],
        dialect: Option<DialectType>,
    ) -> SchemaResult<()>;
    fn column_names(&self, table: &str) -> SchemaResult<Vec<String>>;
    fn get_column_type(
        &self,
        table: &str,
        column: &str,
    ) -> SchemaResult<DataType>;
    fn has_column(&self, table: &str, column: &str) -> bool;
    fn supported_table_args(&self) -> &[&str];
    fn is_empty(&self) -> bool;
    fn depth(&self) -> usize;
    fn find_tables_for_column(&self, column: &str) -> Vec<String>;
}

Abstract trait for database schemas

Required Methods

fn dialect(&self) -> Option<DialectType>

Get the dialect associated with this schema (if any)

fn add_table( &mut self, table: &str, columns: &[(String, DataType)], dialect: Option<DialectType>, ) -> SchemaResult<()>

Add or update a table in the schema

fn column_names(&self, table: &str) -> SchemaResult<Vec<String>>

Get column names for a table

fn get_column_type(&self, table: &str, column: &str) -> SchemaResult<DataType>

Get the type of a column in a table

fn has_column(&self, table: &str, column: &str) -> bool

Check if a column exists in a table

fn supported_table_args(&self) -> &[&str]

Get supported table argument levels

fn is_empty(&self) -> bool

Check if the schema is empty

fn depth(&self) -> usize

Get the nesting depth of the schema

fn find_tables_for_column(&self, column: &str) -> Vec<String>

Find which table(s) contain the given column name. Returns table names that have the column. Used for correlated subquery resolution.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl Schema for MappingSchema