Method limit

src/query/helper.rs:240–250

Add a limit expression. Passing in None would remove the limit. ``` use sea_orm::{entity::*, query::*, tests_cfg::cake, DbBackend}; assert_eq!( cake::Entity::find() .limit(10) .build(DbBackend::MySql) .to_string(), "SELECT `cake`.`id`, `cake`.`name` FROM `cake` LIMIT 10" ); assert_eq!( cake::Entity::find() .limit(Some(10)) .limit(Some(20)) .build(DbBackend::MySql) .to_string(), "SELECT `cake`.`

(mut self, limit: T)

    /// );
    /// ```
    fn limit<T>(mut self, limit: T) -> Self
    where
        T: Into<Option<u64>>,
    {
        if let Some(limit) = limit.into() {
            self.query().limit(limit);
        } else {
            self.query().reset_limit();
        }
        self
    }

    /// Add a group by column
    /// ```