gotosocial/vendor/github.com/uptrace/bun/model_map_slice.go
2021-09-29 15:09:45 +02:00

163 lines
2.6 KiB
Go

package bun
import (
"context"
"database/sql"
"errors"
"sort"
"github.com/uptrace/bun/dialect/feature"
"github.com/uptrace/bun/schema"
)
type mapSliceModel struct {
mapModel
dest *[]map[string]interface{}
keys []string
}
var _ Model = (*mapSliceModel)(nil)
func newMapSliceModel(db *DB, dest *[]map[string]interface{}) *mapSliceModel {
return &mapSliceModel{
mapModel: mapModel{
db: db,
},
dest: dest,
}
}
func (m *mapSliceModel) Value() interface{} {
return m.dest
}
func (m *mapSliceModel) SetCap(cap int) {
if cap > 100 {
cap = 100
}
if slice := *m.dest; len(slice) < cap {
*m.dest = make([]map[string]interface{}, 0, cap)
}
}
func (m *mapSliceModel) ScanRows(ctx context.Context, rows *sql.Rows) (int, error) {
columns, err := rows.Columns()
if err != nil {
return 0, err
}
m.rows = rows
m.columns = columns
dest := makeDest(m, len(columns))
slice := *m.dest
if len(slice) > 0 {
slice = slice[:0]
}
var n int
for rows.Next() {
m.m = make(map[string]interface{}, len(m.columns))
m.scanIndex = 0
if err := rows.Scan(dest...); err != nil {
return 0, err
}
slice = append(slice, m.m)
n++
}
if err := rows.Err(); err != nil {
return 0, err
}
*m.dest = slice
return n, nil
}
func (m *mapSliceModel) appendColumns(fmter schema.Formatter, b []byte) (_ []byte, err error) {
if err := m.initKeys(); err != nil {
return nil, err
}
for i, k := range m.keys {
if i > 0 {
b = append(b, ", "...)
}
b = fmter.AppendIdent(b, k)
}
return b, nil
}
func (m *mapSliceModel) appendValues(fmter schema.Formatter, b []byte) (_ []byte, err error) {
if err := m.initKeys(); err != nil {
return nil, err
}
slice := *m.dest
b = append(b, "VALUES "...)
if m.db.features.Has(feature.ValuesRow) {
b = append(b, "ROW("...)
} else {
b = append(b, '(')
}
if fmter.IsNop() {
for i := range m.keys {
if i > 0 {
b = append(b, ", "...)
}
b = append(b, '?')
}
return b, nil
}
for i, el := range slice {
if i > 0 {
b = append(b, "), "...)
if m.db.features.Has(feature.ValuesRow) {
b = append(b, "ROW("...)
} else {
b = append(b, '(')
}
}
for j, key := range m.keys {
if j > 0 {
b = append(b, ", "...)
}
b = fmter.Dialect().Append(fmter, b, el[key])
}
}
b = append(b, ')')
return b, nil
}
func (m *mapSliceModel) initKeys() error {
if m.keys != nil {
return nil
}
slice := *m.dest
if len(slice) == 0 {
return errors.New("bun: map slice is empty")
}
first := slice[0]
keys := make([]string, 0, len(first))
for k := range first {
keys = append(keys, k)
}
sort.Strings(keys)
m.keys = keys
return nil
}