140 lines
2.6 KiB
Go
140 lines
2.6 KiB
Go
package schema
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import (
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"fmt"
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"reflect"
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"github.com/uptrace/bun/dialect"
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"github.com/uptrace/bun/internal"
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"github.com/uptrace/bun/internal/tagparser"
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)
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type Field struct {
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StructField reflect.StructField
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IsPtr bool
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Tag tagparser.Tag
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IndirectType reflect.Type
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Index []int
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Name string // SQL name, .e.g. id
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SQLName Safe // escaped SQL name, e.g. "id"
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GoName string // struct field name, e.g. Id
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DiscoveredSQLType string
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UserSQLType string
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CreateTableSQLType string
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SQLDefault string
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OnDelete string
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OnUpdate string
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IsPK bool
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NotNull bool
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NullZero bool
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AutoIncrement bool
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Identity bool
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Append AppenderFunc
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Scan ScannerFunc
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IsZero IsZeroerFunc
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}
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func (f *Field) String() string {
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return f.Name
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}
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func (f *Field) Clone() *Field {
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cp := *f
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cp.Index = cp.Index[:len(f.Index):len(f.Index)]
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return &cp
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}
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func (f *Field) Value(strct reflect.Value) reflect.Value {
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return internal.FieldByIndexAlloc(strct, f.Index)
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}
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func (f *Field) HasNilValue(v reflect.Value) bool {
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if len(f.Index) == 1 {
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return v.Field(f.Index[0]).IsNil()
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}
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for _, index := range f.Index {
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if v.Kind() == reflect.Ptr {
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if v.IsNil() {
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return true
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}
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v = v.Elem()
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}
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v = v.Field(index)
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}
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return v.IsNil()
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}
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func (f *Field) HasZeroValue(v reflect.Value) bool {
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if len(f.Index) == 1 {
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return f.IsZero(v.Field(f.Index[0]))
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}
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for _, index := range f.Index {
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if v.Kind() == reflect.Ptr {
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if v.IsNil() {
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return true
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}
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v = v.Elem()
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}
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v = v.Field(index)
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}
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return f.IsZero(v)
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}
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func (f *Field) AppendValue(fmter Formatter, b []byte, strct reflect.Value) []byte {
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fv, ok := fieldByIndex(strct, f.Index)
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if !ok {
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return dialect.AppendNull(b)
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}
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if (f.IsPtr && fv.IsNil()) || (f.NullZero && f.IsZero(fv)) {
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return dialect.AppendNull(b)
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}
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if f.Append == nil {
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panic(fmt.Errorf("bun: AppendValue(unsupported %s)", fv.Type()))
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}
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return f.Append(fmter, b, fv)
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}
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func (f *Field) ScanWithCheck(fv reflect.Value, src interface{}) error {
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if f.Scan == nil {
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return fmt.Errorf("bun: Scan(unsupported %s)", f.IndirectType)
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}
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return f.Scan(fv, src)
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}
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func (f *Field) ScanValue(strct reflect.Value, src interface{}) error {
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if src == nil {
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if fv, ok := fieldByIndex(strct, f.Index); ok {
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return f.ScanWithCheck(fv, src)
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}
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return nil
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}
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fv := internal.FieldByIndexAlloc(strct, f.Index)
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return f.ScanWithCheck(fv, src)
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}
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func (f *Field) SkipUpdate() bool {
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return f.Tag.HasOption("skipupdate")
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}
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func indexEqual(ind1, ind2 []int) bool {
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if len(ind1) != len(ind2) {
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return false
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}
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for i, ind := range ind1 {
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if ind != ind2[i] {
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return false
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}
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}
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return true
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}
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