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package orm
import (
"fmt"
"reflect"
"github.com/go-pg/pg/types"
)
func compositeScanner(typ reflect.Type) types.ScannerFunc {
if typ.Kind() == reflect.Ptr {
typ = typ.Elem()
}
var table *Table
return func(v reflect.Value, rd types.Reader, n int) error {
if !v.CanSet() {
return fmt.Errorf("pg: Scan(nonsettable %s)", v.Type())
}
if n == -1 {
v.Set(reflect.Zero(v.Type()))
return nil
}
if table == nil {
table = GetTable(typ)
}
if v.Kind() == reflect.Ptr {
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
v = v.Elem()
}
p := newCompositeParser(rd)
var elemReader *types.BytesReader
var firstErr error
for i := 0; ; i++ {
elem, err := p.NextElem()
if err != nil {
if err == endOfComposite {
break
}
return err
}
if i >= len(table.Fields) {
if firstErr == nil {
firstErr = fmt.Errorf(
"%s has %d fields, but composite at least %d values",
table, len(table.Fields), i)
}
continue
}
if elemReader == nil {
elemReader = types.NewBytesReader(elem)
} else {
elemReader.Reset(elem)
}
field := table.Fields[i]
if elem == nil {
err = field.ScanValue(v, elemReader, -1)
} else {
err = field.ScanValue(v, elemReader, len(elem))
}
if err != nil && firstErr == nil {
firstErr = err
}
}
return firstErr
}
}
func compositeAppender(typ reflect.Type) types.AppenderFunc {
if typ.Kind() == reflect.Ptr {
typ = typ.Elem()
}
var table *Table
return func(b []byte, v reflect.Value, quote int) []byte {
if table == nil {
table = GetTable(typ)
}
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
b = append(b, "ROW("...)
for i, f := range table.Fields {
if i > 0 {
b = append(b, ',')
}
b = f.AppendValue(b, v, quote)
}
b = append(b, ')')
return b
}
}
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