172 lines
4.1 KiB
Go
172 lines
4.1 KiB
Go
/*
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* table.go
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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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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*/
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package main
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import (
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"fmt"
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"log"
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"github.com/apple/foundationdb/bindings/go/src/fdb"
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"github.com/apple/foundationdb/bindings/go/src/fdb/directory"
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"github.com/apple/foundationdb/bindings/go/src/fdb/subspace"
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"github.com/apple/foundationdb/bindings/go/src/fdb/tuple"
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)
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func clear_subspace(trtr fdb.Transactor, sub subspace.Subspace) error {
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_, err := trtr.Transact(func(tr fdb.Transaction) (interface{}, error) {
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tr.ClearRange(sub)
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return nil, nil
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})
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return err
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}
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func _pack(t interface{}) []byte {
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return tuple.Tuple{t}.Pack()
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}
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func _unpack(t []byte) tuple.Tuple {
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i, e := tuple.Unpack(t)
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if e != nil {
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return nil
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}
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return i
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}
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type Table struct {
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row, col subspace.Subspace
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}
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func (tbl *Table) NewTable(ss subspace.Subspace) {
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tbl.row = ss.Sub("row")
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tbl.col = ss.Sub("col")
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}
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func (tbl Table) TableSetCell(trtr fdb.Transactor, row, column int, value interface{}) {
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trtr.Transact(func(tr fdb.Transaction) (interface{}, error) {
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tr.Set(tbl.row.Pack(tuple.Tuple{row, column}), _pack(value))
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tr.Set(tbl.col.Pack(tuple.Tuple{column, row}), _pack(value))
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return nil, nil
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})
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}
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func (tbl Table) TableGetCell(trtr fdb.Transactor, row, column int) interface{} {
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item, _ := trtr.ReadTransact(func(rtr fdb.ReadTransaction) (interface{}, error) {
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i := rtr.Get(tbl.row.Pack(tuple.Tuple{row, column})).MustGet()
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return i, nil
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})
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return _unpack(item.([]byte))[0]
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}
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func (tbl Table) TableSetRow(trtr fdb.Transactor, row int, cols ...interface{}) {
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trtr.Transact(func(tr fdb.Transaction) (interface{}, error) {
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kr, err := fdb.PrefixRange(tbl.row.Pack(tuple.Tuple{row}))
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if err != nil {
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return nil, err
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}
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tr.ClearRange(kr)
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for c, v := range cols {
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tbl.TableSetCell(tr, row, c, v)
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}
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return nil, nil
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})
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return
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}
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func (tbl Table) TableGetRow(tr fdb.ReadTransactor, row int) ([]interface{}, error) {
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item, err := tr.ReadTransact(func(rtr fdb.ReadTransaction) (interface{}, error) {
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kr, e := fdb.PrefixRange(tbl.row.Pack(tuple.Tuple{row}))
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if e != nil {
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return nil, e
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}
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slice, e := rtr.GetRange(kr, fdb.RangeOptions{0, -1, false}).GetSliceWithError()
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if e != nil {
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return nil, e
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}
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ret := make([]interface{}, len(slice))
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for i, v := range slice {
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ret[i] = _unpack(v.Value)[0]
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}
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return ret, nil
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})
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if err != nil {
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return nil, err
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}
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return item.([]interface{}), nil
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}
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func (tbl Table) TableGetCol(tr fdb.ReadTransactor, col int) ([]interface{}, error) {
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item, err := tr.ReadTransact(func(rtr fdb.ReadTransaction) (interface{}, error) {
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kr, e := fdb.PrefixRange(tbl.col.Pack(tuple.Tuple{col}))
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if e != nil {
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return nil, e
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}
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slice, e := rtr.GetRange(kr, fdb.RangeOptions{0, -1, false}).GetSliceWithError()
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if e != nil {
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return nil, e
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}
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ret := make([]interface{}, len(slice))
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for i, v := range slice {
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ret[i] = _unpack(v.Value)[0]
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}
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return ret, nil
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})
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if err != nil {
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return nil, err
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}
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return item.([]interface{}), nil
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}
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func main() {
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fdb.MustAPIVersion(710)
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db := fdb.MustOpenDefault()
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TableDemoDir, err := directory.CreateOrOpen(db, []string{"Graph"}, nil)
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if err != nil {
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log.Fatal(err)
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}
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clear_subspace(db, TableDemoDir)
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var g Table
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g.NewTable(TableDemoDir)
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g.TableSetCell(db, 0, 0, "Hello")
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g.TableSetCell(db, 0, 1, "World")
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fmt.Println(g.TableGetCell(db, 0, 0).(string))
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fmt.Println(g.TableGetCell(db, 0, 1).(string))
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g.TableSetRow(db, 1, "Hello", "World", "Again!", 1)
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fmt.Println(g.TableGetRow(db, 1))
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}
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