bun/query_table_truncate.go at master · uptrace/bun · GitHub

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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
package bun

import (
	"context"
	"database/sql"

	"github.com/uptrace/bun/dialect/feature"
	"github.com/uptrace/bun/internal"
	"github.com/uptrace/bun/schema"
)

// TruncateTableQuery builds TRUNCATE TABLE statements.
type TruncateTableQuery struct {
	baseQuery
	cascadeQuery

	continueIdentity bool
	comment          string
}

var _ Query = (*TruncateTableQuery)(nil)

// NewTruncateTableQuery creates a TruncateTableQuery attached to the given DB.
func NewTruncateTableQuery(db *DB) *TruncateTableQuery {
	q := &TruncateTableQuery{
		baseQuery: baseQuery{
			db: db,
		},
	}
	return q
}

func (q *TruncateTableQuery) Conn(db IConn) *TruncateTableQuery {
	q.setConn(db)
	return q
}

func (q *TruncateTableQuery) Model(model any) *TruncateTableQuery {
	q.setModel(model)
	return q
}

func (q *TruncateTableQuery) Err(err error) *TruncateTableQuery {
	q.setErr(err)
	return q
}

//------------------------------------------------------------------------------

func (q *TruncateTableQuery) Table(tables ...string) *TruncateTableQuery {
	for _, table := range tables {
		q.addTable(schema.UnsafeIdent(table))
	}
	return q
}

func (q *TruncateTableQuery) TableExpr(query string, args ...any) *TruncateTableQuery {
	q.addTable(schema.SafeQuery(query, args))
	return q
}

func (q *TruncateTableQuery) ModelTableExpr(query string, args ...any) *TruncateTableQuery {
	q.modelTableName = schema.SafeQuery(query, args)
	return q
}

//------------------------------------------------------------------------------

func (q *TruncateTableQuery) ContinueIdentity() *TruncateTableQuery {
	q.continueIdentity = true
	return q
}

func (q *TruncateTableQuery) Cascade() *TruncateTableQuery {
	q.cascade = true
	return q
}

func (q *TruncateTableQuery) Restrict() *TruncateTableQuery {
	q.restrict = true
	return q
}

//------------------------------------------------------------------------------

// Comment adds a comment to the query, wrapped by /* ... */.
func (q *TruncateTableQuery) Comment(comment string) *TruncateTableQuery {
	q.comment = comment
	return q
}

//------------------------------------------------------------------------------

func (q *TruncateTableQuery) Operation() string {
	return "TRUNCATE TABLE"
}

func (q *TruncateTableQuery) AppendQuery(
	gen schema.QueryGen, b []byte,
) (_ []byte, err error) {
	if q.err != nil {
		return nil, q.err
	}

	b = appendComment(b, q.comment)

	if !gen.HasFeature(feature.TableTruncate) {
		b = append(b, "DELETE FROM "...)

		b, err = q.appendTables(gen, b)
		if err != nil {
			return nil, err
		}

		return b, nil
	}

	b = append(b, "TRUNCATE TABLE "...)

	b, err = q.appendTables(gen, b)
	if err != nil {
		return nil, err
	}

	if q.db.HasFeature(feature.TableIdentity) {
		if q.continueIdentity {
			b = append(b, " CONTINUE IDENTITY"...)
		} else {
			b = append(b, " RESTART IDENTITY"...)
		}
	}

	b = q.appendCascade(gen, b)

	return b, nil
}

//------------------------------------------------------------------------------

func (q *TruncateTableQuery) Exec(ctx context.Context, dest ...any) (sql.Result, error) {
	// if a comment is propagated via the context, use it
	setCommentFromContext(ctx, q)

	queryBytes, err := q.AppendQuery(q.db.gen, q.db.makeQueryBytes())
	if err != nil {
		return nil, err
	}

	query := internal.String(queryBytes)

	res, err := q.exec(ctx, q, query)
	if err != nil {
		return nil, err
	}

	return res, nil
}