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use crate::{prelude::ArelModel, statements::ArelStatement};
use std::marker::PhantomData;
#[derive(Debug)]
pub struct Select<M: ArelModel> {
distinct: bool,
sqls: Vec<crate::Sql>,
_marker: PhantomData<M>,
}
impl<M: ArelModel> ArelStatement for Select<M> {
fn sqls(&self) -> Option<&Vec<crate::Sql>> {
if self.sqls.len() > 0 {
Some(&self.sqls)
} else {
None
}
}
fn to_sql(&self) -> Option<crate::Sql> {
let mut final_sql = crate::Sql::new("SELECT ");
if self.distinct {
final_sql.push_str("DISTINCT ");
}
if let Some(sqls) = self.sqls() {
for (idx, sql) in sqls.iter().enumerate() {
if idx >= 1 {
final_sql.push_str(", ");
}
final_sql.push_sql(sql.clone());
}
} else {
final_sql.push_str(format!(r#""{}".*"#, M::table_name()));
}
final_sql.push_str(format!(r#" FROM "{}""#, M::table_name()));
Some(final_sql)
}
}
impl<M: ArelModel> Default for Select<M> {
fn default() -> Self {
Self {
distinct: false,
sqls: vec![],
_marker: PhantomData::<M>,
}
}
}
impl<M: ArelModel> Select<M> {
/// # Examples
///
/// ```
/// use arel::prelude::*;
/// use arel::statements::select::Select;
/// struct User {}
/// impl ArelBase for User {}
/// impl ArelRecord for User {}
/// impl ArelModel for User {}
/// let select = Select::<User>::new(vec!["name", "age"]);
/// assert_eq!(select.to_sql().unwrap().to_sql_string().unwrap(), r#"SELECT "user"."name", "user"."age" FROM "user""#);
///
/// ```
pub fn new<T: AsRef<str>>(columns: Vec<T>) -> Self {
let table_name = M::table_name();
Self {
distinct: false,
sqls: columns.iter().map(|column| crate::Sql::new(format!(r#""{}"."{}""#, table_name, column.as_ref()))).collect(),
_marker: PhantomData::<M>,
}
}
pub fn new_sql<S: Into<crate::Sql>>(sql: S) -> Self {
Self {
distinct: false,
sqls: vec![sql.into()],
_marker: PhantomData::<M>,
}
}
/// # Examples
///
/// ```
/// use arel::prelude::*;
/// use arel::statements::select::Select;
/// struct User {}
/// impl ArelBase for User {}
/// impl ArelRecord for User {}
/// impl ArelModel for User {}
/// let select = Select::<User>::new_sqls(vec!["name", "age"]);
/// assert_eq!(select.to_sql().unwrap().to_sql_string().unwrap(), r#"SELECT name, age FROM "user""#);
///
/// ```
pub fn new_sqls<S: Into<crate::Sql>>(sqls: Vec<S>) -> Self {
Self {
distinct: false,
sqls: sqls.into_iter().map(|sql| sql.into()).collect(),
_marker: PhantomData::<M>,
}
}
pub fn distinct(&mut self) -> &mut Self {
self.distinct = true;
self
}
}