155 lines
3.1 KiB
Go
155 lines
3.1 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 this 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/kv"
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"github.com/abcum/surreal/sql"
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"github.com/abcum/surreal/util/json"
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"github.com/abcum/surreal/util/keys"
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"github.com/cockroachdb/cockroach/client"
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)
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func executeDeleteStatement(ast *sql.DeleteStatement) (out []interface{}, err error) {
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db.Txn(func(txn *client.Txn) error {
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b := txn.NewBatch()
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for _, w := range ast.What {
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switch what := w.(type) {
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case *sql.Thing: // Delete a thing
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var res interface{}
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key := &keys.Thing{
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KV: ast.KV,
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NS: ast.NS,
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DB: ast.DB,
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TB: what.Table,
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ID: what.ID,
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}
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if res, err = delete(txn, key, ast); err != nil {
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return err
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}
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out = append(out, res)
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case *sql.Table: // Delete a table
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var res []interface{}
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beg := &keys.Thing{
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KV: ast.KV,
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NS: ast.NS,
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DB: ast.DB,
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TB: what.Name,
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ID: keys.Prefix,
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}
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end := &keys.Thing{
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KV: ast.KV,
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NS: ast.NS,
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DB: ast.DB,
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TB: what.Name,
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ID: keys.Suffix,
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}
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if res, err = deleteMany(txn, beg, end, ast); err != nil {
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return err
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}
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out = append(out, res...)
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}
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}
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return txn.CommitInBatch(b)
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})
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return
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}
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// delete deletes a single record from the database. Before the record is deleted, all
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// conditions are checked, and if successful, the record, all edges, trail data, and
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// event data are deleted aswell.
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func delete(txn *client.Txn, key *keys.Thing, ast *sql.DeleteStatement) (res interface{}, err error) {
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var kv *kv.KV
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var old *json.Doc
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var doc *json.Doc
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// Check conditions
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if !match(txn, key, ast.Cond) {
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return
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}
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// Select the record
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if kv, err = get(txn, key); err != nil {
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return
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}
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// Parse the record
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if old, doc, err = new(txn, key, kv); err != nil {
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return
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}
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// Delete the record
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if err = del(txn, key); err != nil {
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return
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}
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doc.Reset()
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res = echo(key, old, doc, nil, ast.Echo, sql.ID)
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return
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}
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// deleteMany deletes multiple records from the database. Before the records are deleted,
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// all conditions are checked, and if successful, the records, all edges, trail data,
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// and event data are deleted aswell.
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func deleteMany(txn *client.Txn, beg, end *keys.Thing, ast *sql.DeleteStatement) (res []interface{}, err error) {
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kvs, err := rget(txn, beg, end, -1)
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if err != nil {
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return
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}
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for _, kv := range kvs {
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var ret interface{}
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key := &keys.Thing{}
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key.Decode(kv.Key)
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if ret, err = delete(txn, key, ast); err != nil {
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return
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}
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res = append(res, ret)
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}
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return
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}
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