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use crate::ast::*;
/// A builder for an `INSERT` statement.
#[derive(Clone, Debug, PartialEq)]
pub struct Insert<'a> {
pub(crate) table: Table<'a>,
pub(crate) columns: Vec<Column<'a>>,
pub(crate) values: Vec<Row<'a>>,
pub(crate) on_conflict: Option<OnConflict>,
pub(crate) returning: Option<Vec<Column<'a>>>,
}
/// A builder for an `INSERT` statement for a single row.
pub struct SingleRowInsert<'a> {
pub(crate) table: Table<'a>,
pub(crate) columns: Vec<Column<'a>>,
pub(crate) values: Row<'a>,
}
/// A builder for an `INSERT` statement for multiple rows.
pub struct MultiRowInsert<'a> {
pub(crate) table: Table<'a>,
pub(crate) columns: Vec<Column<'a>>,
pub(crate) values: Vec<Row<'a>>,
}
#[derive(Clone, Copy, Debug, PartialEq)]
/// `INSERT` conflict resolution strategies.
pub enum OnConflict {
/// When a row already exists, do nothing.
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Sqlite}};
/// let query: Insert = Insert::single_into("users").into();
///
/// let (sql, _) = Sqlite::build(query.on_conflict(OnConflict::DoNothing));
///
/// assert_eq!("INSERT OR IGNORE INTO `users` DEFAULT VALUES", sql);
/// ```
DoNothing,
}
impl<'a> From<Insert<'a>> for Query<'a> {
#[inline]
fn from(insert: Insert<'a>) -> Self {
Query::Insert(Box::new(insert))
}
}
impl<'a> From<SingleRowInsert<'a>> for Insert<'a> {
fn from(insert: SingleRowInsert<'a>) -> Self {
let values = if insert.values.is_empty() {
Vec::new()
} else {
vec![insert.values]
};
Insert {
table: insert.table,
columns: insert.columns,
values,
on_conflict: None,
returning: None,
}
}
}
impl<'a> From<MultiRowInsert<'a>> for Insert<'a> {
#[inline]
fn from(insert: MultiRowInsert<'a>) -> Self {
Insert {
table: insert.table,
columns: insert.columns,
values: insert.values,
on_conflict: None,
returning: None,
}
}
}
impl<'a> From<SingleRowInsert<'a>> for Query<'a> {
#[inline]
fn from(insert: SingleRowInsert<'a>) -> Query<'a> {
Query::from(Insert::from(insert))
}
}
impl<'a> From<MultiRowInsert<'a>> for Query<'a> {
#[inline]
fn from(insert: MultiRowInsert<'a>) -> Query<'a> {
Query::from(Insert::from(insert))
}
}
impl<'a> Insert<'a> {
/// Creates a new single row `INSERT` statement for the given table.
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Sqlite}};
/// let query = Insert::single_into("users");
/// let (sql, _) = Sqlite::build(query);
///
/// assert_eq!("INSERT INTO `users` DEFAULT VALUES", sql);
/// ```
#[inline]
pub fn single_into<T>(table: T) -> SingleRowInsert<'a>
where
T: Into<Table<'a>>,
{
SingleRowInsert {
table: table.into(),
columns: Vec::new(),
values: Row::new(),
}
}
/// Creates a new multi row `INSERT` statement for the given table.
#[inline]
pub fn multi_into<T, K, I>(table: T, columns: I) -> MultiRowInsert<'a>
where
T: Into<Table<'a>>,
K: Into<Column<'a>>,
I: IntoIterator<Item = K>,
{
MultiRowInsert {
table: table.into(),
columns: columns.into_iter().map(|c| c.into()).collect(),
values: Vec::new(),
}
}
/// Sets the conflict resolution strategy.
#[inline]
pub fn on_conflict(mut self, on_conflict: OnConflict) -> Self {
self.on_conflict = Some(on_conflict);
self
}
/// Sets the returned columns.
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Postgres}};
/// let query = Insert::single_into("users");
/// let insert = Insert::from(query).returning(vec!["id"]);
/// let (sql, _) = Postgres::build(insert);
///
/// assert_eq!("INSERT INTO \"users\" DEFAULT VALUES RETURNING \"id\"", sql);
/// ```
#[cfg(feature = "postgresql")]
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
}
}
impl<'a> SingleRowInsert<'a> {
/// Adds a new value to the `INSERT` statement
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Sqlite}};
/// let query = Insert::single_into("users").value("foo", 10);
/// let (sql, params) = Sqlite::build(query);
///
/// assert_eq!("INSERT INTO `users` (`foo`) VALUES (?)", sql);
/// assert_eq!(vec![ParameterizedValue::Integer(10)], params);
/// ```
pub fn value<K, V>(mut self, key: K, val: V) -> SingleRowInsert<'a>
where
K: Into<Column<'a>>,
V: Into<DatabaseValue<'a>>,
{
self.columns.push(key.into());
self.values = self.values.push(val.into());
self
}
/// Convert into a common `Insert` statement.
pub fn build(self) -> Insert<'a> {
Insert::from(self)
}
}
impl<'a> MultiRowInsert<'a> {
/// Adds a new row to be inserted.
///
/// ```rust
/// # use quaint::{ast::*, visitor::{Visitor, Sqlite}};
/// let query = Insert::multi_into("users", vec!["foo"])
/// .values(vec![1])
/// .values(vec![2]);
///
/// let (sql, params) = Sqlite::build(query);
///
/// assert_eq!("INSERT INTO `users` (`foo`) VALUES (?), (?)", sql);
///
/// assert_eq!(
/// vec![
/// ParameterizedValue::Integer(1),
/// ParameterizedValue::Integer(2),
/// ], params);
/// ```
pub fn values<V>(mut self, values: V) -> Self
where
V: Into<Row<'a>>,
{
self.values.push(values.into());
self
}
/// Convert into a common `Insert` statement.
pub fn build(self) -> Insert<'a> {
Insert::from(self)
}
}