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use crate::ast::*;
use std::borrow::Cow;
/// A builder for an `UPDATE` statement.
#[derive(Debug, PartialEq, Clone)]
pub struct Update<'a> {
pub(crate) table: Table<'a>,
pub(crate) columns: Vec<Column<'a>>,
pub(crate) values: Vec<Expression<'a>>,
pub(crate) conditions: Option<ConditionTree<'a>>,
pub(crate) comment: Option<Cow<'a, str>>,
pub(crate) returning: Option<Vec<Column<'a>>>,
}
impl<'a> From<Update<'a>> for Query<'a> {
fn from(update: Update<'a>) -> Self {
Query::Update(Box::new(update))
}
}
impl<'a> Update<'a> {
/// Creates the basis for an `UPDATE` statement to the given table.
pub fn table<T>(table: T) -> Self
where
T: Into<Table<'a>>,
{
Self {
table: table.into(),
columns: Vec::new(),
values: Vec::new(),
conditions: None,
comment: None,
returning: None,
}
}
/// Add another column value assignment to the query
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Sqlite}};
/// # fn main() -> Result<(), quaint::error::Error> {
/// let query = Update::table("users").set("foo", 10).set("bar", false);
/// let (sql, params) = Sqlite::build(query)?;
///
/// assert_eq!("UPDATE `users` SET `foo` = ?, `bar` = ?", sql);
///
/// assert_eq!(
/// vec![
/// Value::from(10),
/// Value::from(false),
/// ],
/// params,
/// );
/// # Ok(())
/// # }
/// ```
pub fn set<K, V>(mut self, column: K, value: V) -> Update<'a>
where
K: Into<Column<'a>>,
V: Into<Expression<'a>>,
{
self.columns.push(column.into());
self.values.push(value.into());
self
}
/// Adds a comment to the update.
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Sqlite}};
/// # fn main() -> Result<(), quaint::error::Error> {
/// let query = Update::table("users").set("foo", 10).comment("trace_id='5bd66ef5095369c7b0d1f8f4bd33716a', parent_id='c532cb4098ac3dd2'");
/// let (sql, _) = Sqlite::build(query)?;
///
/// assert_eq!("UPDATE `users` SET `foo` = ? /* 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 quaint::{ast::*, visitor::{Visitor, Sqlite}};
/// # fn main() -> Result<(), quaint::error::Error> {
/// let query = Update::table("users").set("foo", 1).so_that("bar".equals(false));
/// let (sql, params) = Sqlite::build(query)?;
///
/// assert_eq!("UPDATE `users` SET `foo` = ? WHERE `bar` = ?", sql);
///
/// assert_eq!(
/// vec![
/// Value::from(1),
/// Value::from(false),
/// ],
/// params,
/// );
/// # Ok(())
/// # }
/// ```
///
/// We can also use a nested `SELECT` in the conditions.
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Sqlite}};
/// # fn main() -> Result<(), quaint::error::Error> {
/// let select = Select::from_table("bars").column("id").so_that("uniq_val".equals(3));
/// let query = Update::table("users").set("foo", 1).so_that("bar".equals(select));
/// let (sql, params) = Sqlite::build(query)?;
///
/// assert_eq!(
/// "UPDATE `users` SET `foo` = ? WHERE `bar` = (SELECT `id` FROM `bars` WHERE `uniq_val` = ?)",
/// sql
/// );
///
/// assert_eq!(
/// vec![
/// Value::from(1),
/// Value::from(3),
/// ],
/// params,
/// );
/// # Ok(())
/// # }
/// ```
pub fn so_that<T>(mut self, conditions: T) -> Self
where
T: Into<ConditionTree<'a>>,
{
self.conditions = Some(conditions.into());
self
}
/// Sets the returned columns.
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Postgres}};
/// # fn main() -> Result<(), quaint::error::Error> {
/// let update = Update::table("users").set("foo", 10);
/// let update = update.returning(vec!["id"]);
/// let (sql, _) = Postgres::build(update)?;
///
/// assert_eq!("UPDATE \"users\" SET \"foo\" = $1 RETURNING \"id\"", sql);
/// # Ok(())
/// # }
/// ```
pub fn returning<K, I>(mut self, columns: I) -> Self
where
K: Into<Column<'a>>,
I: IntoIterator<Item = K>,
{
self.returning = Some(columns.into_iter().map(|k| k.into()).collect());
self
}
}