func fieldHasDefault(m driver.Model, f *Field) bool {
if f.Default != "" {
return true
}
fields := m.Fields()
idx := fields.MNameMap[f.Name]
return fields.HasDefault(idx)
}
func (s sortModels) less(mi, mj driver.Model) bool {
for _, v := range mi.Fields().References {
if v.Model == mj {
return false
}
if v.Model != mi && !s.less(v.Model, mj) {
return false
}
}
return true
}
func (b *Backend) Insert(db *sql.DB, m driver.Model, query string, args ...interface{}) (driver.Result, error) {
fields := m.Fields()
if fields.AutoincrementPk {
q := query + " RETURNING " + fields.MNames[fields.PrimaryKey]
var id int64
err := db.QueryRow(q, args...).Scan(&id)
// We need to perform a "real" insert to find the real error, so
// just let the code fall to the Exec at the end of the function
// if there's an error.
if err == nil {
return insertResult(id), nil
}
}
return db.Exec(query, args...)
}
func (b *SqlBackend) AddFields(db *DB, m driver.Model, prevTable *Table, newTable *Table, fields []*Field) error {
modelFields := m.Fields()
tableName := db.QuoteIdentifier(m.Table())
for _, v := range fields {
idx := modelFields.MNameMap[v.Name]
field := v
hasDefault := modelFields.HasDefault(idx)
if hasDefault && v.HasConstraint(ConstraintNotNull) {
// ORM level default
// Must be added as nullable first, then the default value
// must be set and finally the field has to be altered to be
// nullable.
field = field.Copy()
var constraints []*Constraint
for _, v := range field.Constraints {
if v.Type != ConstraintNotNull {
constraints = append(constraints, v)
}
}
field.Constraints = constraints
}
sql, cons, err := field.SQL(db, m, newTable)
if err != nil {
return err
}
if _, err = db.Exec(fmt.Sprintf("ALTER TABLE %s ADD COLUMN %s", tableName, sql)); err != nil {
return err
}
if hasDefault {
value := modelFields.DefaultValue(idx)
fieldName := db.QuoteIdentifier(v.Name)
if _, err := db.Exec(fmt.Sprintf("UPDATE %s SET %s = ?", tableName, fieldName), value); err != nil {
return err
}
if v.HasConstraint(ConstraintNotNull) {
if err := db.Backend().AlterField(db, m, newTable, field, v); err != nil {
return err
}
}
}
for _, c := range cons {
if _, err = db.Exec(fmt.Sprintf("ALTER TABLE %s ADD CONSTRAINT %s", tableName, c)); err != nil {
return err
}
}
}
return nil
}
func (d *Driver) mergeTable(m driver.Model, prevTable *Table, newTable *Table) error {
existing := make(map[string]*Field)
for _, v := range prevTable.Fields {
existing[v.Name] = v
}
var missing []*Field
for _, v := range newTable.Fields {
prev := existing[v.Name]
if prev == nil {
// Check if we can add the field
if v.HasConstraint(ConstraintNotNull) && !fieldHasDefault(m, v) {
return fmt.Errorf("can't add NOT NULL field %q to table %q without a default value", v.Name, m.Table())
}
if v.HasConstraint(ConstraintPrimaryKey) {
return fmt.Errorf("can't add PRIMARY KEY field %q to table %q", v.Name, m.Table())
}
missing = append(missing, v)
} else {
if prev.Type != v.Type {
// Check the Kind
k1, len1 := TypeKind(prev.Type)
k2, len2 := TypeKind(v.Type)
if k1 == k2 {
// Check lengths
if len1 != len2 {
}
continue
}
// Check if we can transform the kind
fields := m.Fields()
idx := fields.MNameMap[v.Name]
modelName := fields.QNames[idx]
modelType := fields.Types[idx]
return fmt.Errorf("field %q on table %q is of type %s which is not compatible with the model field %q of type %s (%s)",
v.Name, m.Table(), prev.Type, modelName, v.Type, modelType)
}
}
}
if len(missing) > 0 {
if err := d.backend.AddFields(d.db, m, prevTable, newTable, missing); err != nil {
return err
}
}
return nil
}
func (d *Driver) outValues(m driver.Model, out interface{}) (reflect.Value, *driver.Fields, []interface{}, []*scanner, error) {
val := reflect.ValueOf(out)
if !val.IsValid() {
// Untyped nil pointer
return reflect.Value{}, nil, nil, nil, nil
}
vt := val.Type()
if vt.Kind() != reflect.Ptr {
return reflect.Value{}, nil, nil, nil, fmt.Errorf("can't set object of type %T. Please, pass a %v rather than a %v", out, reflect.PtrTo(vt), vt)
}
if vt.Elem().Kind() == reflect.Ptr && vt.Elem().Elem().Kind() == reflect.Struct {
// Received a pointer to pointer. Always create a new object,
// to avoid overwriting the previous result.
val = val.Elem()
el := reflect.New(val.Type().Elem())
val.Set(el)
}
for val.Kind() == reflect.Ptr {
el := val.Elem()
if !el.IsValid() {
if !val.CanSet() {
// Typed nil pointer
return reflect.Value{}, nil, nil, nil, nil
}
el = reflect.New(val.Type().Elem())
val.Set(el)
}
val = el
}
fields := m.Fields()
if fields == nil {
// Skipped model
return reflect.Value{}, nil, nil, nil, nil
}
values := make([]interface{}, len(fields.Indexes))
scanners := make([]*scanner, len(fields.Indexes))
for ii, v := range fields.Indexes {
field := d.fieldByIndex(val, v, true)
tag := fields.Tags[ii]
s := newScanner(&field, tag, d.backend)
scanners[ii] = s
values[ii] = s
}
return val, fields, values, scanners, nil
}
func (d *Driver) createIndex(m driver.Model, idx *index.Index, name string) error {
has, err := d.backend.HasIndex(d.db, m, idx, name)
if err != nil {
return err
}
if has {
return nil
}
buf := getBuffer()
buf.WriteString("CREATE ")
if idx.Unique {
buf.WriteString("UNIQUE ")
}
buf.WriteString("INDEX ")
buf.WriteString(name)
buf.WriteString(" ON \"")
buf.WriteString(m.Table())
buf.WriteString("\" (")
fields := m.Fields()
for _, v := range idx.Fields {
name, _, err := fields.Map(v)
if err != nil {
return err
}
buf.WriteByte('"')
buf.WriteString(name)
buf.WriteByte('"')
if DescField(idx, v) {
buf.WriteString(" DESC")
}
buf.WriteByte(',')
}
buf.Truncate(buf.Len() - 1)
buf.WriteString(")")
_, err = d.db.Exec(buftos(buf))
putBuffer(buf)
return err
}
func (d *Driver) Insert(m driver.Model, data interface{}) (driver.Result, error) {
var id int64
fields := m.Fields()
var pkVal *reflect.Value
// TODO: If the PK is supplied by the user rather than auto-assigned, it
// might conflict with PKs generated by datastore.AllocateIDs().
if fields.PrimaryKey >= 0 {
p := d.primaryKey(fields, data)
if p.IsValid() && types.Kind(p.Kind()) == types.Int {
id = p.Int()
if id == 0 {
// Must assign PK field value after calling AllocateIDs
pkVal = &p
}
}
}
name := m.Table()
// Make all objects of a given kind ancestors of the same key. While
// this hurts scalability, it makes all reads strongly consistent.
parent := d.parentKey(m)
var err error
if id == 0 {
id, _, err = datastore.AllocateIDs(d.c, name, parent, 1)
if err != nil {
return nil, err
}
}
if fields.AutoincrementPk && pkVal != nil {
pkVal.SetInt(int64(id))
}
key := datastore.NewKey(d.c, name, "", id, parent)
log.Debugf("DATASTORE: put %s %v", key, data)
_, err = datastore.Put(d.c, key, data)
if err != nil {
return nil, err
}
return &result{key: key, count: 1}, nil
}
func (d *Driver) makeTable(m driver.Model) (*Table, error) {
fields := m.Fields()
names := fields.MNames
qnames := fields.QNames
ftypes := fields.Types
tags := fields.Tags
dbFields := make([]*Field, len(names))
for ii, v := range names {
typ := ftypes[ii]
tag := tags[ii]
ft, err := d.backend.FieldType(typ, tag)
if err != nil {
return nil, err
}
def := tag.Value("default")
if fields.HasDefault(ii) {
// Handled by the ORM
def = ""
}
if def != "" {
if driver.IsFunc(def) {
fname, _ := driver.SplitFuncArgs(def)
fn, err := d.backend.Func(fname, ftypes[ii])
if err != nil {
if err == ErrFuncNotSupported {
err = fmt.Errorf("backend %s does not support function %s", d.backend.Name(), tag.Value("default"))
}
return nil, err
}
def = fn
} else {
def = driver.UnescapeDefault(def)
if typ.Kind() == reflect.String {
def = d.db.QuoteString(def)
}
}
}
field := &Field{
Name: v,
Type: ft,
Default: def,
}
if tag.Has("notnull") {
field.AddConstraint(ConstraintNotNull)
}
if d.isPrimaryKey(fields, ii, tag) {
field.AddConstraint(ConstraintPrimaryKey)
} else if tag.Has("unique") {
field.AddConstraint(ConstraintUnique)
}
if tag.Has("auto_increment") {
field.AddOption(OptionAutoIncrement)
}
if ref := fields.References[qnames[ii]]; ref != nil {
fk, _, err := ref.Model.Fields().Map(ref.Field)
if err != nil {
return nil, err
}
field.Constraints = append(field.Constraints, &Constraint{
Type: ConstraintForeignKey,
References: MakeReference(ref.Model.Table(), fk),
})
}
dbFields[ii] = field
}
return &Table{Fields: dbFields}, nil
}
func (d *Driver) saveParameters(m driver.Model, data interface{}) (reflect.Value, []string, []interface{}, error) {
// data is guaranteed to be of m.Type()
val := driver.Direct(reflect.ValueOf(data))
fields := m.Fields()
max := len(fields.MNames)
names := make([]string, 0, max)
values := make([]interface{}, 0, max)
var err error
if d.transforms != nil {
for ii, v := range fields.Indexes {
f := d.fieldByIndex(val, v, false)
if !f.IsValid() {
continue
}
if fields.OmitEmpty[ii] && driver.IsZero(f) {
continue
}
ft := f.Type()
var fval interface{}
if _, ok := d.transforms[ft]; ok {
fval, err = d.backend.TransformOutValue(f)
if err != nil {
return val, nil, nil, err
}
if fields.NullEmpty[ii] && driver.IsZero(reflect.ValueOf(fval)) {
fval = nil
}
} else if !fields.NullEmpty[ii] || !driver.IsZero(f) {
if c := codec.FromTag(fields.Tags[ii]); c != nil {
fval, err = c.Encode(f.Interface())
if err != nil {
return val, nil, nil, err
}
if p := pipe.FromTag(fields.Tags[ii]); p != nil {
data, err := p.Encode(fval.([]byte))
if err != nil {
return val, nil, nil, err
}
fval = data
}
} else {
// Most sql drivers won't accept aliases for string type
if ft.Kind() == reflect.String && ft != stringType {
f = f.Convert(stringType)
}
fval = f.Interface()
}
}
names = append(names, fields.MNames[ii])
values = append(values, fval)
}
} else {
for ii, v := range fields.Indexes {
f := d.fieldByIndex(val, v, false)
if !f.IsValid() {
continue
}
if fields.OmitEmpty[ii] && driver.IsZero(f) {
continue
}
var fval interface{}
if !fields.NullEmpty[ii] || !driver.IsZero(f) {
if c := codec.FromTag(fields.Tags[ii]); c != nil {
fval, err = c.Encode(&f)
if err != nil {
return val, nil, nil, err
}
} else {
ft := f.Type()
// Most sql drivers won't accept aliases for string type
if ft.Kind() == reflect.String && ft != stringType {
f = f.Convert(stringType)
}
fval = f.Interface()
}
}
names = append(names, fields.MNames[ii])
values = append(values, fval)
}
}
return val, names, values, nil
}
func (d *Driver) applyQuery(m driver.Model, dq *datastore.Query, q query.Q) (*datastore.Query, error) {
var field *query.Field
var op string
switch x := q.(type) {
case *query.Eq:
field = &x.Field
op = " ="
case *query.Lt:
field = &x.Field
op = " <"
case *query.Lte:
field = &x.Field
op = " <="
case *query.Gt:
field = &x.Field
op = " >"
case *query.Gte:
field = &x.Field
op = " >="
case *query.And:
var err error
for _, v := range x.Conditions {
dq, err = d.applyQuery(m, dq, v)
if err != nil {
return nil, err
}
}
case nil:
default:
return nil, fmt.Errorf("datastore does not support %T queries", q)
}
if field != nil {
if _, ok := field.Value.(query.F); ok {
return nil, fmt.Errorf("datastore queries can't reference other properties (%v)", field.Value)
}
name := field.Field
fields := m.Fields()
idx, ok := fields.QNameMap[name]
if !ok {
return nil, fmt.Errorf("can't map field %q to a datastore name", name)
}
if strings.IndexByte(name, '.') >= 0 {
// GAE flattens embedded fields, so we must remove
// the parts of the field which refer to a flattened
// field.
indexes := fields.Indexes[idx]
parts := strings.Split(name, ".")
if len(indexes) == len(parts) {
var final []string
typ := fields.Type
for ii, v := range indexes {
f := typ.Field(v)
if !f.Anonymous {
final = append(final, parts[ii])
}
typ = f.Type
}
name = strings.Join(final, ".")
}
}
log.Debugf("DATASTORE: filter %s %s %v", m, name+op, field.Value)
dq = dq.Filter(name+op, field.Value)
}
return dq, nil
}