78 lines
1.9 KiB
Go
78 lines
1.9 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/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 (e *executor) executeSelectStatement(txn kvs.TX, ast *sql.SelectStatement) (out []interface{}, err error) {
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for k, w := range ast.What {
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if what, ok := w.(*sql.Param); ok {
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ast.What[k] = e.ctx.Get(what.ID).Data()
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}
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}
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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(0, key.Encode())
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doc := item.New(kv, e.txn, key, e.ctx)
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if ret, err := detect(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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key := &keys.Table{KV: ast.KV, NS: ast.NS, DB: ast.DB, TB: what.TB}
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kvs, _ := txn.GetL(0, key.Encode())
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for _, kv := range kvs {
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doc := item.New(kv, txn, nil, e.ctx)
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if ret, err := detect(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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return
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}
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func detect(doc *item.Doc, ast *sql.SelectStatement) (out interface{}, err error) {
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if !doc.Check(ast.Cond) {
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return
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}
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if !doc.Allow("SELECT") {
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return
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}
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out = doc.Blaze(ast)
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return
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}
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