forked from cockroachdb/cockroach
-
Notifications
You must be signed in to change notification settings - Fork 0
/
txn.go
70 lines (63 loc) · 2.19 KB
/
txn.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
// Copyright 2015 The Cockroach Authors.
//
// 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.
//
// Author: Vivek Menezes (vivek@cockroachlabs.com)
package sql
import (
"github.com/cockroachdb/cockroach/roachpb"
"github.com/cockroachdb/cockroach/sql/parser"
)
// BeginTransaction starts a new transaction.
func (p *planner) BeginTransaction(n *parser.BeginTransaction) (planNode, *roachpb.Error) {
if p.txn == nil {
return nil, roachpb.NewErrorf("the server should have already created a transaction")
}
if pErr := p.setIsolationLevel(n.Isolation); pErr != nil {
return nil, pErr
}
return &valuesNode{}, nil
}
// CommitTransaction commits a transaction.
func (p *planner) CommitTransaction(n *parser.CommitTransaction) (planNode, *roachpb.Error) {
pErr := p.txn.Commit()
// Reset transaction.
p.resetTxn()
return &valuesNode{}, pErr
}
// RollbackTransaction rolls back a transaction.
func (p *planner) RollbackTransaction(n *parser.RollbackTransaction) (planNode, *roachpb.Error) {
pErr := p.txn.Rollback()
// Reset transaction.
p.resetTxn()
return &valuesNode{}, pErr
}
// SetTransaction sets a transaction's isolation level
func (p *planner) SetTransaction(n *parser.SetTransaction) (planNode, *roachpb.Error) {
if pErr := p.setIsolationLevel(n.Isolation); pErr != nil {
return nil, pErr
}
return &valuesNode{}, nil
}
func (p *planner) setIsolationLevel(level parser.IsolationLevel) *roachpb.Error {
switch level {
case parser.UnspecifiedIsolation:
return nil
case parser.SnapshotIsolation:
return p.txn.SetIsolation(roachpb.SNAPSHOT)
case parser.SerializableIsolation:
return p.txn.SetIsolation(roachpb.SERIALIZABLE)
default:
return roachpb.NewErrorf("unknown isolation level: %s", level)
}
}