qoo 0.1.1

query builder library. Query Object Oriented.
Documentation 
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use crate::base::{Base, SelectUpdateDeleteBase};

/// Structure for update statement.
pub struct UpdateBuilder {
    cnt: u32,
    q: String
}

impl UpdateBuilder {
    /// Assemble the update statement.
    ///
    ///
    /// # Examples
    ///
    /// ```
    /// let update_query =
    ///     UpdateBuilder::update("test1")
    ///         .set("col1='aaa'")
    ///         .set("col2='bbb'")
    ///         .wheres("id >= 11");
    /// assert_eq!(
    ///     update_query.to_sql(),
    ///     "update test1 set col1='aaa', col2='bbb' where id >= 11".to_string()
    /// );
    /// ```
    pub fn update(table: &str) -> Self {
        UpdateBuilder {
            cnt: 0,
            q: format!("update {}", table.to_string()),
        }
    }

    pub fn set(mut self, val: &str) -> Self {
        if self.cnt == 0 {
            self.q = format!("{} set {}", self.q, val);
            self.cnt += self.cnt + 1;
        } else {
            self.q = format!("{}, {}", self.q, val);
            self.cnt += self.cnt + 1;
        }
        self
    }

    pub fn wheres(mut self, where_str: &str) -> Self {
        self.q = self.where_phrase(where_str);
        self
    }
}

impl Base for UpdateBuilder {
    fn query(&self) -> String {
        self.q.to_string()
    }
}

impl SelectUpdateDeleteBase for UpdateBuilder {}