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

183 lines
3.1 KiB
Go

package bun
import (
"context"
"database/sql"
"reflect"
"sort"
"github.com/uptrace/bun/schema"
)
type mapModel struct {
db *DB
dest *map[string]interface{}
m map[string]interface{}
rows *sql.Rows
columns []string
_columnTypes []*sql.ColumnType
scanIndex int
}
var _ Model = (*mapModel)(nil)
func newMapModel(db *DB, dest *map[string]interface{}) *mapModel {
m := &mapModel{
db: db,
dest: dest,
}
if dest != nil {
m.m = *dest
}
return m
}
func (m *mapModel) Value() interface{} {
return m.dest
}
func (m *mapModel) ScanRows(ctx context.Context, rows *sql.Rows) (int, error) {
if !rows.Next() {
return 0, rows.Err()
}
columns, err := rows.Columns()
if err != nil {
return 0, err
}
m.rows = rows
m.columns = columns
dest := makeDest(m, len(columns))
if m.m == nil {
m.m = make(map[string]interface{}, len(m.columns))
}
m.scanIndex = 0
if err := rows.Scan(dest...); err != nil {
return 0, err
}
*m.dest = m.m
return 1, nil
}
func (m *mapModel) Scan(src interface{}) error {
if _, ok := src.([]byte); !ok {
return m.scanRaw(src)
}
columnTypes, err := m.columnTypes()
if err != nil {
return err
}
scanType := columnTypes[m.scanIndex].ScanType()
switch scanType.Kind() {
case reflect.Interface:
return m.scanRaw(src)
case reflect.Slice:
if scanType.Elem().Kind() == reflect.Uint8 {
return m.scanRaw(src)
}
}
dest := reflect.New(scanType).Elem()
if err := schema.Scanner(scanType)(dest, src); err != nil {
return err
}
return m.scanRaw(dest.Interface())
}
func (m *mapModel) columnTypes() ([]*sql.ColumnType, error) {
if m._columnTypes == nil {
columnTypes, err := m.rows.ColumnTypes()
if err != nil {
return nil, err
}
m._columnTypes = columnTypes
}
return m._columnTypes, nil
}
func (m *mapModel) scanRaw(src interface{}) error {
columnName := m.columns[m.scanIndex]
m.scanIndex++
m.m[columnName] = src
return nil
}
func (m *mapModel) appendColumnsValues(fmter schema.Formatter, b []byte) []byte {
keys := make([]string, 0, len(m.m))
for k := range m.m {
keys = append(keys, k)
}
sort.Strings(keys)
b = append(b, " ("...)
for i, k := range keys {
if i > 0 {
b = append(b, ", "...)
}
b = fmter.AppendIdent(b, k)
}
b = append(b, ") VALUES ("...)
isTemplate := fmter.IsNop()
for i, k := range keys {
if i > 0 {
b = append(b, ", "...)
}
if isTemplate {
b = append(b, '?')
} else {
b = fmter.Dialect().Append(fmter, b, m.m[k])
}
}
b = append(b, ")"...)
return b
}
func (m *mapModel) appendSet(fmter schema.Formatter, b []byte) []byte {
keys := make([]string, 0, len(m.m))
for k := range m.m {
keys = append(keys, k)
}
sort.Strings(keys)
isTemplate := fmter.IsNop()
for i, k := range keys {
if i > 0 {
b = append(b, ", "...)
}
b = fmter.AppendIdent(b, k)
b = append(b, " = "...)
if isTemplate {
b = append(b, '?')
} else {
b = fmter.Dialect().Append(fmter, b, m.m[k])
}
}
return b
}
func makeDest(v interface{}, n int) []interface{} {
dest := make([]interface{}, n)
for i := range dest {
dest[i] = v
}
return dest
}