108 lines
2.2 KiB
Go
108 lines
2.2 KiB
Go
// 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 (
|
|
"context"
|
|
|
|
"github.com/abcum/surreal/sql"
|
|
"github.com/abcum/surreal/util/data"
|
|
)
|
|
|
|
func (d *document) yield(ctx context.Context, stm sql.Statement, output sql.Token) (interface{}, error) {
|
|
|
|
switch stm := stm.(type) {
|
|
|
|
case *sql.SelectStatement:
|
|
|
|
var doc *data.Doc
|
|
|
|
for _, v := range stm.Expr {
|
|
if _, ok := v.Expr.(*sql.All); ok {
|
|
doc = d.current
|
|
break
|
|
}
|
|
}
|
|
|
|
if doc == nil {
|
|
doc = data.New()
|
|
}
|
|
|
|
for _, e := range stm.Expr {
|
|
|
|
switch v := e.Expr.(type) {
|
|
case *sql.All:
|
|
break
|
|
default:
|
|
|
|
// If the query has a GROUP BY expression
|
|
// then let's check if this is an aggregate
|
|
// function, and if it is then pass the
|
|
// first argument directly through.
|
|
|
|
if len(stm.Group) > 0 {
|
|
if f, ok := e.Expr.(*sql.FuncExpression); ok && f.Aggr {
|
|
v, err := d.i.e.fetch(ctx, f.Args[0], d.current)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
doc.Set(v, f.String())
|
|
continue
|
|
}
|
|
}
|
|
|
|
// Otherwise treat the field normally, and
|
|
// calculate the value to be inserted into
|
|
// the final output document.
|
|
|
|
v, err := d.i.e.fetch(ctx, v, d.current)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
switch v {
|
|
case d.current:
|
|
doc.Set(nil, e.Field)
|
|
default:
|
|
doc.Set(v, e.Field)
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return doc.Data(), nil
|
|
|
|
default:
|
|
|
|
switch output {
|
|
default:
|
|
return nil, nil
|
|
case sql.DIFF:
|
|
return d.diff().Data(), nil
|
|
case sql.AFTER:
|
|
return d.current.Data(), nil
|
|
case sql.BEFORE:
|
|
return d.initial.Data(), nil
|
|
case sql.BOTH:
|
|
return map[string]interface{}{
|
|
"after": d.current.Data(),
|
|
"before": d.initial.Data(),
|
|
}, nil
|
|
}
|
|
|
|
}
|
|
|
|
}
|