102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use doc file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package db
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import (
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"github.com/abcum/surreal/kvs"
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"github.com/abcum/surreal/sql"
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"github.com/abcum/surreal/util/item"
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"github.com/abcum/surreal/util/keys"
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)
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func executeDeleteStatement(ast *sql.DeleteStatement) (out []interface{}, err error) {
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txn, err := db.Txn(true)
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if err != nil {
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return
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}
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defer txn.Rollback()
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for _, w := range ast.What {
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if what, ok := w.(*sql.Thing); ok {
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key := &keys.Thing{KV: ast.KV, NS: ast.NS, DB: ast.DB, TB: what.TB, ID: what.ID}
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kv, _ := txn.Get(key.Encode())
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doc := item.New(kv, key)
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if ret, err := delete(txn, doc, ast); err != nil {
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return nil, err
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} else if ret != nil {
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out = append(out, ret)
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}
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}
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if what, ok := w.(sql.Table); ok {
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beg := &keys.Thing{KV: ast.KV, NS: ast.NS, DB: ast.DB, TB: what, ID: keys.Prefix}
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end := &keys.Thing{KV: ast.KV, NS: ast.NS, DB: ast.DB, TB: what, ID: keys.Suffix}
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kvs, _ := txn.RGet(beg.Encode(), end.Encode(), 0)
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for _, kv := range kvs {
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doc := item.New(kv, nil)
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if ret, err := delete(txn, doc, ast); err != nil {
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return nil, err
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} else if ret != nil {
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out = append(out, ret)
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}
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}
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}
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}
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txn.Commit()
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return
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}
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func delete(txn *kvs.TX, doc *item.Doc, ast *sql.DeleteStatement) (out interface{}, err error) {
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if !doc.Check(txn, ast.Cond) {
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return nil, nil
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}
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if err = doc.Erase(txn, nil); err != nil {
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return nil, err
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}
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if err = doc.StoreTrail(txn); err != nil {
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return nil, err
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}
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if err = doc.PurgeIndex(txn); err != nil {
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return nil, err
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}
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if err = doc.PurgeThing(txn); err != nil {
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return nil, err
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}
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if ast.Hard {
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if err = doc.PurgePatch(txn); err != nil {
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return nil, err
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}
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}
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out = doc.Yield(ast.Echo, sql.ID)
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return
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}
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