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| // Copyright 2023 RisingWave Labs | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use model_migration::WithQuery; | ||
| use sea_orm::sea_query::{ | ||
| Alias, CommonTableExpression, Expr, Query, SelectStatement, UnionType, WithClause, | ||
| }; | ||
| use sea_orm::{ColumnTrait, JoinType, Order}; | ||
|
|
||
| use crate::model_v2::object_dependency; | ||
| use crate::model_v2::prelude::*; | ||
|
|
||
| /// This function will construct a query using recursive cte to find all objects that are used by the given object. | ||
| /// | ||
| /// # Examples | ||
| /// | ||
| /// ``` | ||
| /// use risingwave_meta::controller::utils::construct_obj_dependency_query; | ||
| /// use sea_orm::sea_query::*; | ||
| /// use sea_orm::*; | ||
| /// | ||
| /// let query = construct_obj_dependency_query(1, "used_by"); | ||
| /// | ||
| /// assert_eq!( | ||
| /// query.to_string(MysqlQueryBuilder), | ||
| /// r#"WITH RECURSIVE `used_by_object_ids` (`used_by`) AS (SELECT `used_by` FROM `object_dependency` WHERE `object_dependency`.`oid` = 1 UNION ALL (SELECT `object_dependency`.`used_by` FROM `object_dependency` INNER JOIN `used_by_object_ids` ON `used_by_object_ids`.`used_by` = `oid`)) SELECT DISTINCT `used_by` FROM `used_by_object_ids` ORDER BY `used_by` DESC"# | ||
| /// ); | ||
| /// assert_eq!( | ||
| /// query.to_string(PostgresQueryBuilder), | ||
| /// r#"WITH RECURSIVE "used_by_object_ids" ("used_by") AS (SELECT "used_by" FROM "object_dependency" WHERE "object_dependency"."oid" = 1 UNION ALL (SELECT "object_dependency"."used_by" FROM "object_dependency" INNER JOIN "used_by_object_ids" ON "used_by_object_ids"."used_by" = "oid")) SELECT DISTINCT "used_by" FROM "used_by_object_ids" ORDER BY "used_by" DESC"# | ||
| /// ); | ||
| /// assert_eq!( | ||
| /// query.to_string(SqliteQueryBuilder), | ||
| /// r#"WITH RECURSIVE "used_by_object_ids" ("used_by") AS (SELECT "used_by" FROM "object_dependency" WHERE "object_dependency"."oid" = 1 UNION ALL SELECT "object_dependency"."used_by" FROM "object_dependency" INNER JOIN "used_by_object_ids" ON "used_by_object_ids"."used_by" = "oid") SELECT DISTINCT "used_by" FROM "used_by_object_ids" ORDER BY "used_by" DESC"# | ||
| /// ); | ||
| /// ``` | ||
| pub fn construct_obj_dependency_query(obj_id: i32, column: &str) -> WithQuery { | ||
| let cte_alias = Alias::new("used_by_object_ids"); | ||
| let cte_return_alias = Alias::new(column); | ||
|
|
||
| let base_query = SelectStatement::new() | ||
| .column(object_dependency::Column::UsedBy) | ||
| .from(ObjectDependency) | ||
| .and_where(object_dependency::Column::Oid.eq(obj_id)) | ||
| .to_owned(); | ||
|
|
||
| let cte_referencing = Query::select() | ||
| .column((ObjectDependency, object_dependency::Column::UsedBy)) | ||
| .from(ObjectDependency) | ||
| .join( | ||
| JoinType::InnerJoin, | ||
| cte_alias.clone(), | ||
| Expr::col((cte_alias.clone(), cte_return_alias.clone())) | ||
| .equals(object_dependency::Column::Oid), | ||
| ) | ||
| .to_owned(); | ||
|
|
||
| let common_table_expr = CommonTableExpression::new() | ||
| .query( | ||
| base_query | ||
| .clone() | ||
| .union(UnionType::All, cte_referencing) | ||
| .to_owned(), | ||
| ) | ||
| .column(cte_return_alias.clone()) | ||
| .table_name(cte_alias.clone()) | ||
| .to_owned(); | ||
|
|
||
| SelectStatement::new() | ||
| .distinct() | ||
| .column(cte_return_alias.clone()) | ||
| .from(cte_alias) | ||
| .order_by(cte_return_alias.clone(), Order::Desc) | ||
| .to_owned() | ||
| .with( | ||
| WithClause::new() | ||
| .recursive(true) | ||
| .cte(common_table_expr) | ||
| .to_owned(), | ||
| ) | ||
| .to_owned() | ||
| } |