* Supported json.Marshaller query parameter in database/sql driver

CHANGELOG.md

@@ -1,3 +1,5 @@
+* Supported `json.Marshaller` query parameter in `database/sql` driver
+
 ## v3.108.0
 * Added `query.EmptyTxControl()` for empty transaction control (server-side defines transaction control by internal logic)
 * Marked as deprecated `query.NoTx()` because this is wrong name for server-side transaction control inference

internal/bind/bind.go

@@ -1,10 +1,12 @@
 package bind
 
 import (
+	"database/sql/driver"
 	"sort"
 
 	"github.com/ydb-platform/ydb-go-sdk/v3/internal/params"
 	"github.com/ydb-platform/ydb-go-sdk/v3/internal/xerrors"
+	"github.com/ydb-platform/ydb-go-sdk/v3/internal/xslices"
 	"github.com/ydb-platform/ydb-go-sdk/v3/internal/xstring"
 )
 
@@ -29,15 +31,25 @@ type Bind interface {
 type Bindings []Bind
 
 func (bindings Bindings) ToYdb(sql string, args ...any) (
-	yql string, params params.Params, err error,
+	yql string, pp params.Params, err error,
 ) {
 	if len(bindings) == 0 {
-		params, err = Params(args...)
+		pp, err = Params(args...)
 		if err != nil {
 			return "", nil, xerrors.WithStackTrace(err)
 		}
 
-		return sql, params, nil
+		return sql, pp, nil
+	}
+
+	if len(args) == 1 {
+		if nv, has := args[0].(driver.NamedValue); has {
+			if pp, has := nv.Value.(*params.Params); has {
+				args = xslices.Transform(*pp, func(v *params.Parameter) any {
+					return v
+				})
+			}
+		}
 	}
 
 	buffer := xstring.Buffer()
@@ -51,12 +63,12 @@ func (bindings Bindings) ToYdb(sql string, args ...any) (
 		}
 	}
 
-	params, err = Params(args...)
+	pp, err = Params(args...)
 	if err != nil {
 		return "", nil, xerrors.WithStackTrace(err)
 	}
 
-	return sql, params, nil
+	return sql, pp, nil
 }
 
 func Sort(bindings []Bind) []Bind {

internal/bind/params.go

@@ -3,6 +3,7 @@ package bind
 import (
 	"database/sql"
 	"database/sql/driver"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"net/url"
@@ -16,6 +17,7 @@ import (
 	"github.com/ydb-platform/ydb-go-sdk/v3/internal/types"
 	"github.com/ydb-platform/ydb-go-sdk/v3/internal/value"
 	"github.com/ydb-platform/ydb-go-sdk/v3/internal/xerrors"
+	"github.com/ydb-platform/ydb-go-sdk/v3/internal/xstring"
 )
 
 var (
@@ -164,7 +166,7 @@ func toValue(v any) (_ value.Value, err error) {
 	if valuer, ok := v.(driver.Valuer); ok {
 		v, err = valuer.Value()
 		if err != nil {
-			return nil, fmt.Errorf("ydb: driver.Valuer error: %w", err)
+			return nil, xerrors.WithStackTrace(fmt.Errorf("driver.Valuer error: %w", err))
 		}
 	}
 
@@ -255,6 +257,13 @@ func toValue(v any) (_ value.Value, err error) {
 		return value.TimestampValueFromTime(x), nil
 	case time.Duration:
 		return value.IntervalValueFromDuration(x), nil
+	case json.Marshaler:
+		bytes, err := x.MarshalJSON()
+		if err != nil {
+			return nil, xerrors.WithStackTrace(err)
+		}
+
+		return value.JSONValue(xstring.FromBytes(bytes)), nil
 	default:
 		kind := reflect.TypeOf(x).Kind()
 		switch kind {
@@ -266,7 +275,7 @@ func toValue(v any) (_ value.Value, err error) {
 				list[i], err = toValue(v.Index(i).Interface())
 				if err != nil {
 					return nil, xerrors.WithStackTrace(
-						fmt.Errorf("cannot parse %d item of slice %T: %w",
+						fmt.Errorf("cannot parse item #%d of slice %T: %w",
 							i, x, err,
 						),
 					)
@@ -307,8 +316,8 @@ func toValue(v any) (_ value.Value, err error) {
 				kk, has := v.Type().Field(i).Tag.Lookup("sql")
 				if !has {
 					return nil, xerrors.WithStackTrace(
-						fmt.Errorf("cannot parse %q as key field of struct: %w",
-							v.Type().Field(i).Name, errUnsupportedType,
+						fmt.Errorf("cannot parse %q as key field of struct %T: %w",
+							v.Type().Field(i).Name, x, errUnsupportedType,
 						),
 					)
 				}
@@ -348,15 +357,16 @@ func supportNewTypeLink(x any) string {
 }
 
 func toYdbParam(name string, value any) (*params.Parameter, error) {
-	switch tv := value.(type) {
-	case driver.NamedValue:
-		n, v := tv.Name, tv.Value
+	if nv, has := value.(driver.NamedValue); has {
+		n, v := nv.Name, nv.Value
 		if n != "" {
 			name = n
 		}
 		value = v
-	case *params.Parameter:
-		return tv, nil
+	}
+
+	if nv, ok := value.(params.NamedValue); ok {
+		return params.Named(nv.Name(), nv.Value()), nil
 	}
 
 	v, err := toValue(value)