forked from go-pg/pg
/
scan_hstore.go
58 lines (50 loc) · 1.1 KB
/
scan_hstore.go
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package types
import (
"fmt"
"reflect"
"github.com/go-pg/pg/internal/parser"
)
func HstoreScanner(typ reflect.Type) ScannerFunc {
if typ.Key() == stringType && typ.Elem() == stringType {
return scanMapStringStringValue
}
return func(v reflect.Value, b []byte) error {
return fmt.Errorf("pg.Hstore(unsupported %s)", v.Type())
}
}
func scanMapStringString(b []byte) (map[string]string, error) {
if b == nil {
return nil, nil
}
p := parser.NewHstoreParser(b)
m := make(map[string]string)
for p.Valid() {
key, err := p.NextKey()
if err != nil {
return nil, err
}
if key == nil {
return nil, fmt.Errorf("pg: unexpected NULL: %q", b)
}
value, err := p.NextValue()
if err != nil {
return nil, err
}
if value == nil {
return nil, fmt.Errorf("pg: unexpected NULL: %q", b)
}
m[string(key)] = string(value)
}
return m, nil
}
func scanMapStringStringValue(v reflect.Value, b []byte) error {
if !v.CanSet() {
return fmt.Errorf("pg: Scan(nonsettable %s)", v.Type())
}
m, err := scanMapStringString(b)
if err != nil {
return err
}
v.Set(reflect.ValueOf(m))
return nil
}