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Refactor Scan

This commit is contained in:
Jinzhu 2022-02-28 09:28:19 +08:00
parent 43a72b369e
commit e2e802b837
3 changed files with 21 additions and 16 deletions
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6
callbacks/create.go
View File

@ -201,13 +201,15 @@ func ConvertToCreateValues(stmt *gorm.Statement) (values clause.Values) {
switch stmt.ReflectValue.Kind() {
case reflect.Slice, reflect.Array:
rValLen := stmt.ReflectValue.Len()
stmt.SQL.Grow(rValLen * 18)
values.Values = make([][]interface{}, rValLen)
if rValLen == 0 {
stmt.AddError(gorm.ErrEmptySlice)
return
}
stmt.SQL.Grow(rValLen * 18)
stmt.Vars = make([]interface{}, 0, rValLen*len(values.Columns))
values.Values = make([][]interface{}, rValLen)
defaultValueFieldsHavingValue := map[*schema.Field][]interface{}{}
for i := 0; i < rValLen; i++ {
rv := reflect.Indirect(stmt.ReflectValue.Index(i))

29
scan.go
View File

@ -54,10 +54,6 @@ func (db *DB) scanIntoStruct(rows *sql.Rows, reflectValue reflect.Value, values
for idx, field := range fields {
if field != nil {
values[idx] = field.NewValuePool.Get()
defer field.NewValuePool.Put(values[idx])
if len(joinFields) == 0 || joinFields[idx][0] == nil {
defer field.Set(db.Statement.Context, reflectValue, values[idx])
}
} else if len(fields) == 1 {
if reflectValue.CanAddr() {
values[idx] = reflectValue.Addr().Interface()
@ -70,17 +66,24 @@ func (db *DB) scanIntoStruct(rows *sql.Rows, reflectValue reflect.Value, values
db.RowsAffected++
db.AddError(rows.Scan(values...))
for idx, joinField := range joinFields {
if joinField[0] != nil {
relValue := joinField[0].ReflectValueOf(db.Statement.Context, reflectValue)
if relValue.Kind() == reflect.Ptr && relValue.IsNil() {
if value := reflect.ValueOf(values[idx]).Elem(); value.Kind() == reflect.Ptr && value.IsNil() {
return
}
for idx, field := range fields {
if field != nil {
if len(joinFields) == 0 || joinFields[idx][0] == nil {
field.Set(db.Statement.Context, reflectValue, values[idx])
} else {
relValue := joinFields[idx][0].ReflectValueOf(db.Statement.Context, reflectValue)
if relValue.Kind() == reflect.Ptr && relValue.IsNil() {
if value := reflect.ValueOf(values[idx]).Elem(); value.Kind() == reflect.Ptr && value.IsNil() {
return
}
relValue.Set(reflect.New(relValue.Type().Elem()))
relValue.Set(reflect.New(relValue.Type().Elem()))
}
joinFields[idx][1].Set(db.Statement.Context, relValue, values[idx])
}
joinField[1].Set(db.Statement.Context, relValue, values[idx])
// release data to pool
field.NewValuePool.Put(values[idx])
}
}
}

2
tests/go.mod
View File

@ -8,7 +8,7 @@ require (
github.com/jackc/pgx/v4 v4.15.0 // indirect
github.com/jinzhu/now v1.1.4
github.com/lib/pq v1.10.4
github.com/mattn/go-sqlite3 v1.14.11 // indirect
github.com/mattn/go-sqlite3 v1.14.12 // indirect
golang.org/x/crypto v0.0.0-20220214200702-86341886e292 // indirect
gorm.io/driver/mysql v1.3.2
gorm.io/driver/postgres v1.3.1