forked from go-pg/pg
/
append_hstore.go
49 lines (40 loc) · 1.02 KB
/
append_hstore.go
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package types
import (
"fmt"
"reflect"
)
var mapStringStringType = reflect.TypeOf(map[string]string(nil))
func HstoreAppender(typ reflect.Type) AppenderFunc {
if typ.Key() == stringType && typ.Elem() == stringType {
return appendMapStringStringValue
}
return func(b []byte, v reflect.Value, quote int) []byte {
err := fmt.Errorf("pg.Hstore(unsupported %s)", v.Type())
return AppendError(b, err)
}
}
func appendMapStringString(b []byte, m map[string]string, quote int) []byte {
if m == nil {
return AppendNull(b, quote)
}
if quote == 1 {
b = append(b, '\'')
}
for key, value := range m {
b = AppendString(b, key, 2)
b = append(b, '=', '>')
b = AppendString(b, value, 2)
b = append(b, ',')
}
if len(m) > 0 {
b = b[:len(b)-1] // Strip trailing comma.
}
if quote == 1 {
b = append(b, '\'')
}
return b
}
func appendMapStringStringValue(b []byte, v reflect.Value, quote int) []byte {
m := v.Convert(mapStringStringType).Interface().(map[string]string)
return appendMapStringString(b, m, quote)
}