// Copyright © 2016 Abcum Ltd // // 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. package db import ( "fmt" "context" "github.com/abcum/surreal/sql" "github.com/abcum/surreal/util/data" "github.com/abcum/surreal/util/keys" ) func (e *executor) executeDelete(ctx context.Context, stm *sql.DeleteStatement) ([]interface{}, error) { var what sql.Exprs for _, val := range stm.What { w, err := e.fetch(ctx, val, nil) if err != nil { return nil, err } what = append(what, w) } i := newIterator(e, ctx, stm, false) for _, w := range what { switch what := w.(type) { default: return nil, fmt.Errorf("Can not execute DELETE query using value '%v'", what) case *sql.Table: key := &keys.Table{KV: stm.KV, NS: stm.NS, DB: stm.DB, TB: what.TB} i.processTable(ctx, key) case *sql.Ident: key := &keys.Table{KV: stm.KV, NS: stm.NS, DB: stm.DB, TB: what.ID} i.processTable(ctx, key) case *sql.Thing: key := &keys.Thing{KV: stm.KV, NS: stm.NS, DB: stm.DB, TB: what.TB, ID: what.ID} i.processThing(ctx, key) case *sql.Model: key := &keys.Thing{KV: stm.KV, NS: stm.NS, DB: stm.DB, TB: what.TB, ID: nil} i.processModel(ctx, key, what) case *sql.Batch: key := &keys.Thing{KV: stm.KV, NS: stm.NS, DB: stm.DB, TB: what.TB, ID: nil} i.processBatch(ctx, key, what) } } return i.Yield(ctx) } func (e *executor) fetchDelete(ctx context.Context, stm *sql.DeleteStatement, doc *data.Doc) (interface{}, error) { ctx = dive(ctx) if doc != nil { vars := data.New() vars.Set(doc.Data(), varKeyParent) ctx = context.WithValue(ctx, ctxKeySubs, vars) } out, err := e.executeDelete(ctx, stm) if err != nil { return nil, err } switch len(out) { case 1: return data.Consume(out).Get(docKeyOne, docKeyId).Data(), nil default: return data.Consume(out).Get(docKeyAll, docKeyId).Data(), nil } } func (d *document) runDelete(ctx context.Context, stm *sql.DeleteStatement) (interface{}, error) { var ok bool var err error var met = _DELETE if err = d.init(ctx); err != nil { return nil, err } if err = d.lock(ctx); err != nil { return nil, err } if err = d.setup(ctx); err != nil { return nil, err } if d.val.Exi() == false { return nil, nil } if ok, err = d.allow(ctx, met); err != nil { return nil, err } else if ok == false { return nil, nil } if ok, err = d.check(ctx, stm.Cond); err != nil { return nil, err } else if ok == false { return nil, nil } if err = d.erase(); err != nil { return nil, err } if err = d.purgeIndex(ctx); err != nil { return nil, err } if stm.Hard { if err = d.eraseThing(ctx); err != nil { return nil, err } } else { if err = d.purgeThing(ctx); err != nil { return nil, err } } if err = d.table(ctx, met); err != nil { return nil, err } if err = d.event(ctx, met); err != nil { return nil, err } if err = d.lives(ctx, met); err != nil { return nil, err } return d.yield(ctx, stm, stm.Echo) }