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use crate::WhereOption;
use super::TableName;
use super::{DbType, ModelTableField, ModelTableName};
use sqlx::database::HasArguments;
use sqlx::query::Query;
use sqlx::{Arguments, Database, Error, Executor, IntoArguments};
pub struct Delete<DB>
where
DB: Database,
{
pub table_name: TableName,
_marker: std::marker::PhantomData<DB>,
}
impl<DB> Delete<DB>
where
DB: Database,
{
pub fn type_new<T1>() -> Delete<DB>
where
T1: ModelTableField<DB> + ModelTableName,
{
Delete {
table_name: T1::table_name(),
_marker: Default::default(),
}
}
pub fn new(table_name: TableName) -> Delete<DB> {
Delete {
table_name,
_marker: Default::default(),
}
}
pub async fn execute_by_where_call<'c, RB, E>(
&self,
where_sql: &str,
where_bind: RB,
executor: E,
) -> Result<<DB as Database>::QueryResult, Error>
where
for<'q> RB: FnOnce(
Query<'q, DB, <DB as HasArguments<'q>>::Arguments>,
&'q Delete<DB>,
) -> Query<'q, DB, <DB as HasArguments<'q>>::Arguments>,
for<'n> <DB as HasArguments<'n>>::Arguments: Arguments<'n> + IntoArguments<'n, DB>,
E: Executor<'c, Database = DB>,
{
let sql = format!(
"DELETE FROM {} WHERE {}",
self.table_name.full_name(),
where_sql
);
let mut res = sqlx::query(sql.as_str());
res = where_bind(res, self);
executor.execute(res).await
}
pub async fn execute_by_where<'c, E>(
&self,
where_sql: &WhereOption,
executor: E,
) -> Result<<DB as Database>::QueryResult, Error>
where
for<'n> <DB as HasArguments<'n>>::Arguments: Arguments<'n> + IntoArguments<'n, DB>,
E: Executor<'c, Database = DB>,
{
let sql = match where_sql {
WhereOption::Where(wsql) => {
format!("DELETE FROM {} WHERE {}", self.table_name.full_name(), wsql)
}
WhereOption::None => {
format!("DELETE FROM {} ", self.table_name.full_name())
}
WhereOption::NoWhere(other) => {
format!("DELETE FROM {} {}", self.table_name.full_name(), other)
}
};
let res = sqlx::query(sql.as_str());
executor.execute(res).await
}
pub async fn execute_by_pk<'c, T, E>(
&self,
source: &T,
executor: E,
) -> Result<<DB as Database>::QueryResult, Error>
where
for<'n> <DB as HasArguments<'n>>::Arguments: Arguments<'n> + IntoArguments<'n, DB>,
T: ModelTableField<DB>,
E: Executor<'c, Database = DB>,
{
let pkf = T::table_pk();
let mut where_sql = vec![];
for (pos, val) in pkf.0.iter().enumerate() {
let bst = DbType::type_new::<DB>().mark(pos);
where_sql.push(format!("{}={}", val.name, bst));
}
let sql = format!(
"DELETE FROM {} WHERE {}",
self.table_name.full_name(),
where_sql.join(" and ")
);
let mut res = sqlx::query(sql.as_str());
for val in pkf.0.iter() {
res = source.query_sqlx_bind(val, res);
}
executor.execute(res).await
}
pub async fn execute_by_scalar_pk<'c, T, PT, E>(
&self,
pk_scalar: PT,
executor: E,
) -> Result<<DB as Database>::QueryResult, Error>
where
for<'n> <DB as HasArguments<'n>>::Arguments: Arguments<'n> + IntoArguments<'n, DB>,
T: ModelTableField<DB>,
for<'q> PT: 'q + Send + sqlx::Encode<'q, DB> + sqlx::Type<DB>,
E: Executor<'c, Database = DB>,
{
let sql = format!(
"DELETE FROM {} WHERE {}",
self.table_name.full_name(),
scalar_pk_where!(DB, T::table_pk())
);
let mut res = sqlx::query(sql.as_str());
res = res.bind(pk_scalar);
executor.execute(res).await
}
}