/
show_create_database.go
104 lines (84 loc) · 2.79 KB
/
show_create_database.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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
// Copyright 2020-2021 Dolthub, Inc.
//
// 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 plan
import (
"bytes"
"fmt"
"github.com/dolthub/go-mysql-server/sql"
)
// ShowCreateDatabase returns the SQL for creating a database.
type ShowCreateDatabase struct {
db sql.Database
IfNotExists bool
}
var showCreateDatabaseSchema = sql.Schema{
{Name: "Database", Type: sql.LongText},
{Name: "Create Database", Type: sql.LongText},
}
// NewShowCreateDatabase creates a new ShowCreateDatabase node.
func NewShowCreateDatabase(db sql.Database, ifNotExists bool) *ShowCreateDatabase {
return &ShowCreateDatabase{db, ifNotExists}
}
var _ sql.Databaser = (*ShowCreateDatabase)(nil)
// Database implements the sql.Databaser interface.
func (s *ShowCreateDatabase) Database() sql.Database {
return s.db
}
// WithDatabase implements the sql.Databaser interface.
func (s *ShowCreateDatabase) WithDatabase(db sql.Database) (sql.Node, error) {
nc := *s
nc.db = db
return &nc, nil
}
// RowIter implements the sql.Node interface.
func (s *ShowCreateDatabase) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
var name = s.db.Name()
var buf bytes.Buffer
buf.WriteString("CREATE DATABASE ")
if s.IfNotExists {
buf.WriteString("/*!32312 IF NOT EXISTS*/ ")
}
buf.WriteRune('`')
buf.WriteString(name)
buf.WriteRune('`')
buf.WriteString(fmt.Sprintf(
" /*!40100 DEFAULT CHARACTER SET %s COLLATE %s */",
sql.Collation_Default.CharacterSet().String(),
sql.Collation_Default.String(),
))
return sql.RowsToRowIter(
sql.NewRow(name, buf.String()),
), nil
}
// Schema implements the sql.Node interface.
func (s *ShowCreateDatabase) Schema() sql.Schema {
return showCreateDatabaseSchema
}
func (s *ShowCreateDatabase) String() string {
return fmt.Sprintf("SHOW CREATE DATABASE %s", s.db.Name())
}
// Children implements the sql.Node interface.
func (s *ShowCreateDatabase) Children() []sql.Node { return nil }
// Resolved implements the sql.Node interface.
func (s *ShowCreateDatabase) Resolved() bool {
_, ok := s.db.(sql.UnresolvedDatabase)
return !ok
}
// WithChildren implements the Node interface.
func (s *ShowCreateDatabase) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(s, len(children), 0)
}
return s, nil
}