Method columns

src/query/helper.rs:155–164

Select columns ``` use sea_orm::{entity::*, query::*, tests_cfg::cake, DbBackend}; assert_eq!( cake::Entity::find() .select_only() .columns([cake::Column::Id, cake::Column::Name]) .build(DbBackend::Postgres) .to_string(), r#"SELECT "cake"."id", "cake"."name" FROM "cake""# ); ``` Conditionally select all columns expect a specific column ``` use sea_orm::{entity::*, query::*, tests_cfg::cake, Db

(mut self, cols: I)

    /// );
    /// ```
    fn columns<C, I>(mut self, cols: I) -> Self
    where
        C: ColumnTrait,
        I: IntoIterator<Item = C>,
    {
        for col in cols.into_iter() {
            self = self.column(col);
        }
        self
    }

    /// Add an offset expression. Passing in None would remove the offset.
    ///