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use crate::ast::*;
use std::borrow::Cow;
#[derive(Debug, PartialEq, Clone)]
/// A builder for a `DELETE` statement.
pub struct Delete<'a> {
pub(crate) table: Table<'a>,
pub(crate) conditions: Option<ConditionTree<'a>>,
pub(crate) comment: Option<Cow<'a, str>>,
}
impl<'a> From<Delete<'a>> for Query<'a> {
fn from(delete: Delete<'a>) -> Self {
Query::Delete(Box::new(delete))
}
}
impl<'a> Delete<'a> {
/// Creates a new `DELETE` statement for the given table.
///
/// ```rust
/// # use sqlint::{ast::*, visitor::{Visitor, Sqlite}};
/// # fn main() -> Result<(), sqlint::error::Error> {
/// let query = Delete::from_table("users");
/// let (sql, _) = Sqlite::build(query)?;
///
/// assert_eq!("DELETE FROM `users`", sql);
/// # Ok(())
/// # }
/// ```
pub fn from_table<T>(table: T) -> Self
where
T: Into<Table<'a>>,
{
Self { table: table.into(), conditions: None, comment: None }
}
/// Adds a comment to the delete.
///
/// ```rust
/// # use sqlint::{ast::*, visitor::{Visitor, Sqlite}};
/// # fn main() -> Result<(), sqlint::error::Error> {
/// let query = Delete::from_table("users").comment("trace_id='5bd66ef5095369c7b0d1f8f4bd33716a', parent_id='c532cb4098ac3dd2'");
/// let (sql, _) = Sqlite::build(query)?;
///
/// assert_eq!("DELETE FROM `users` /* trace_id='5bd66ef5095369c7b0d1f8f4bd33716a', parent_id='c532cb4098ac3dd2' */", sql);
/// # Ok(())
/// # }
/// ```
pub fn comment<C: Into<Cow<'a, str>>>(mut self, comment: C) -> Self {
self.comment = Some(comment.into());
self
}
/// Adds `WHERE` conditions to the query. See
/// [Comparable](trait.Comparable.html#required-methods) for more examples.
///
/// ```rust
/// # use sqlint::{ast::*, visitor::{Visitor, Sqlite}};
/// # fn main() -> Result<(), sqlint::error::Error> {
/// let query = Delete::from_table("users").so_that("bar".equals(false));
/// let (sql, params) = Sqlite::build(query)?;
///
/// assert_eq!("DELETE FROM `users` WHERE `bar` = ?", sql);
/// assert_eq!(vec![Value::boolean(false)], params);
/// # Ok(())
/// # }
/// ```
pub fn so_that<T>(mut self, conditions: T) -> Self
where
T: Into<ConditionTree<'a>>,
{
self.conditions = Some(conditions.into());
self
}
}