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//! DROP VIEW statement builder
//!
//! This module provides the `DropViewStatement` type for building SQL DROP VIEW queries.
use crate::{
backend::QueryBuilder,
types::{DynIden, IntoIden},
};
use super::traits::{QueryBuilderTrait, QueryStatementBuilder, QueryStatementWriter};
/// DROP VIEW statement builder
///
/// This struct provides a fluent API for constructing DROP VIEW queries.
///
/// # Examples
///
/// ```rust,ignore
/// use reinhardt_query::prelude::*;
///
/// let query = Query::drop_view()
/// .name("active_users")
/// .if_exists();
/// ```
#[derive(Debug, Clone)]
pub struct DropViewStatement {
pub(crate) names: Vec<DynIden>,
pub(crate) if_exists: bool,
pub(crate) cascade: bool,
pub(crate) restrict: bool,
pub(crate) materialized: bool,
}
impl DropViewStatement {
/// Create a new DROP VIEW statement
pub fn new() -> Self {
Self {
names: Vec::new(),
if_exists: false,
cascade: false,
restrict: false,
materialized: false,
}
}
/// Take the ownership of data in the current [`DropViewStatement`]
pub fn take(&mut self) -> Self {
Self {
names: std::mem::take(&mut self.names),
if_exists: self.if_exists,
cascade: self.cascade,
restrict: self.restrict,
materialized: self.materialized,
}
}
/// Set the view name to drop
///
/// # Examples
///
/// ```rust,ignore
/// use reinhardt_query::prelude::*;
///
/// let query = Query::drop_view()
/// .name("active_users");
/// ```
pub fn name<N>(&mut self, name: N) -> &mut Self
where
N: IntoIden,
{
self.names.push(name.into_iden());
self
}
/// Set multiple view names to drop
///
/// # Examples
///
/// ```rust,ignore
/// use reinhardt_query::prelude::*;
///
/// let query = Query::drop_view()
/// .names(vec!["view1", "view2", "view3"]);
/// ```
pub fn names<I, N>(&mut self, names: I) -> &mut Self
where
I: IntoIterator<Item = N>,
N: IntoIden,
{
for name in names {
self.names.push(name.into_iden());
}
self
}
/// Add IF EXISTS clause
///
/// # Examples
///
/// ```rust,ignore
/// use reinhardt_query::prelude::*;
///
/// let query = Query::drop_view()
/// .name("active_users")
/// .if_exists();
/// ```
pub fn if_exists(&mut self) -> &mut Self {
self.if_exists = true;
self
}
/// Add CASCADE clause
///
/// This option automatically drops dependent objects.
/// Supported by PostgreSQL.
///
/// # Examples
///
/// ```rust,ignore
/// use reinhardt_query::prelude::*;
///
/// let query = Query::drop_view()
/// .name("active_users")
/// .cascade();
/// ```
pub fn cascade(&mut self) -> &mut Self {
self.cascade = true;
self.restrict = false;
self
}
/// Add RESTRICT clause
///
/// This option prevents dropping if there are dependent objects (default behavior).
/// Supported by PostgreSQL.
///
/// # Examples
///
/// ```rust,ignore
/// use reinhardt_query::prelude::*;
///
/// let query = Query::drop_view()
/// .name("active_users")
/// .restrict();
/// ```
pub fn restrict(&mut self) -> &mut Self {
self.restrict = true;
self.cascade = false;
self
}
/// Set MATERIALIZED flag (PostgreSQL only)
///
/// # Examples
///
/// ```rust,ignore
/// use reinhardt_query::prelude::*;
///
/// let query = Query::drop_view()
/// .name("active_users")
/// .materialized(true);
/// ```
pub fn materialized(&mut self, materialized: bool) -> &mut Self {
self.materialized = materialized;
self
}
}
impl Default for DropViewStatement {
fn default() -> Self {
Self::new()
}
}
impl QueryStatementBuilder for DropViewStatement {
fn build_any(&self, query_builder: &dyn QueryBuilderTrait) -> (String, crate::value::Values) {
// Downcast to concrete QueryBuilder type
use std::any::Any;
if let Some(builder) =
(query_builder as &dyn Any).downcast_ref::<crate::backend::PostgresQueryBuilder>()
{
return builder.build_drop_view(self);
}
if let Some(builder) =
(query_builder as &dyn Any).downcast_ref::<crate::backend::MySqlQueryBuilder>()
{
return builder.build_drop_view(self);
}
if let Some(builder) =
(query_builder as &dyn Any).downcast_ref::<crate::backend::SqliteQueryBuilder>()
{
return builder.build_drop_view(self);
}
panic!("Unsupported query builder type");
}
}
impl QueryStatementWriter for DropViewStatement {}