Add support for the WITH clause #1139
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // | ||
| // SQLite.swift | ||
| // https://github.com/stephencelis/SQLite.swift | ||
| // Copyright © 2014-2015 Stephen Celis. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
| // | ||
| import Foundation | ||
|
|
||
| extension QueryType { | ||
|
|
||
| /// Sets a `WITH` clause on the query. | ||
| /// | ||
| /// let users = Table("users") | ||
| /// let id = Expression<String>("email") | ||
| /// let name = Expression<String?>("name") | ||
| /// | ||
| /// let userNames = Table("user_names") | ||
| /// userCategories.with(userNames, as: users.select(name)) | ||
| /// // WITH "user_names" as (SELECT "name" FROM "users") SELECT * FROM "user_names" | ||
| /// | ||
| /// - Parameters: | ||
| /// | ||
| /// - alias: A name to assign to the table expression. | ||
| /// | ||
| /// - recursive: Whether to evaluate the expression recursively. | ||
| /// | ||
| /// - hint: Provides a hint to the query planner for how the expression should be implemented. | ||
| /// | ||
| /// - subquery: A query that generates the rows for the table expression. | ||
| /// | ||
| /// - Returns: A query with the given `ORDER BY` clause applied. | ||
| public func with(_ alias: Table, columns: [Expressible]? = nil, recursive: Bool = false, | ||
| hint: MaterializationHint? = nil, as subquery: QueryType) -> Self { | ||
| var query = self | ||
| let clause = WithClauses.Clause(alias: alias, columns: columns, hint: hint, query: subquery) | ||
| query.clauses.with.recursive = query.clauses.with.recursive || recursive | ||
| query.clauses.with.clauses.append(clause) | ||
| return query | ||
| } | ||
|
|
||
| /// self.clauses.with transformed to an Expressible | ||
| var withClause: Expressible? { | ||
| guard !clauses.with.clauses.isEmpty else { | ||
| return nil | ||
| } | ||
|
|
||
| let innerClauses = ", ".join(clauses.with.clauses.map { (clause) in | ||
| let hintExpr: Expression<Void>? | ||
| if let hint = clause.hint { | ||
| hintExpr = Expression<Void>(literal: hint.rawValue) | ||
| } else { | ||
| hintExpr = nil | ||
| } | ||
|
|
||
| let columnExpr: Expression<Void>? | ||
| if let columns = clause.columns { | ||
| columnExpr = "".wrap(", ".join(columns)) | ||
| } else { | ||
| columnExpr = nil | ||
| } | ||
|
|
||
| let expressions: [Expressible?] = [ | ||
| clause.alias.tableName(), | ||
| columnExpr, | ||
| Expression<Void>(literal: "AS"), | ||
| hintExpr, | ||
| "".wrap(clause.query) as Expression<Void> | ||
| ] | ||
|
|
||
| return " ".join(expressions.compactMap { $0 }) | ||
| }) | ||
|
|
||
| return " ".join([ | ||
| Expression<Void>(literal: clauses.with.recursive ? "WITH RECURSIVE" : "WITH"), | ||
| innerClauses | ||
| ]) | ||
| } | ||
| } |
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I agree that putting
allin front of the parameter list is clearer here (and mimics the SQL), but as you say this will break API compatibility, so we'll have to release it as0.14.