fix: 修复 *time.Time 字段扫描失败及 time.Time 精度丢失问题

- createColumnScans: *time.Time 等指针到结构体类型改用 *interface{} 扫描目标，避免 database/sql 因无法将 []byte 转换为 *time.Time 而报 scan error - ScanStruct: time.Time 值直接存入 record，跳过 toJSONRawMessage 格式化，保留纳秒精度和时区 Location - SafeSetVarValue: 新增 T→*T 赋值路径（适用于 time.Time→*time.Time 等场景），以及从 *json.RawMessage 解析 *time.Time 的路径（处理 []byte datetime 字符串） - 新增 parseTimeFromRaw 支持 MySQL datetime、date-only、ISO8601、RFC3339 等格式 - 新增测试：覆盖 time.Time/[]byte 驱动值、date-only 格式、NULL 指针等场景
2026-06-02 15:57:10 +08:00
parent 37581f3a65
commit e7fabd282f
3 changed files with 232 additions and 65 deletions
@@ -1426,6 +1426,93 @@ func (qes *queryExecutorSuite) TestScanVal_withStruct_sqlScanner() {
 	qes.Equal(sql.NullString{String: "hello", Valid: true}, ns)
 }

+// TestScanStructs_timeField_fromTime 验证 time.Time 和 *time.Time 字段直接从 time.Time 驱动值扫描，
+// 纳秒精度和时区 Location 必须原样保留。
+func (qes *queryExecutorSuite) TestScanStructs_timeField_fromTime() {
+	type Row struct {
+		T  time.Time  `db:"t"`
+		PT *time.Time `db:"pt"`
+	}
+	db, mock, err := sqlmock.New()
+	qes.NoError(err)
+	now := time.Now() // 含纳秒、Local 时区
+	mock.ExpectQuery(`SELECT \* FROM "items"`).
+		WillReturnRows(sqlmock.NewRows([]string{"t", "pt"}).
+			AddRow(now, now).
+			AddRow(now, nil),
+		)
+
+	e := newQueryExecutor(db, nil, `SELECT * FROM "items"`)
+	var items []Row
+	qes.NoError(e.ScanStructs(&items))
+	qes.Len(items, 2)
+
+	// 时间相等（Equal 只比较时刻，不比较 Location）
+	qes.True(items[0].T.Equal(now))
+	qes.NotNil(items[0].PT)
+	qes.True(items[0].PT.Equal(now))
+	// 纳秒精度保留
+	qes.Equal(now.Nanosecond(), items[0].T.Nanosecond())
+	qes.Equal(now.Nanosecond(), items[0].PT.Nanosecond())
+	// NULL → nil 指针
+	qes.Nil(items[1].PT)
+}
+
+// TestScanStructs_timeField_fromBytes 验证 time.Time 和 *time.Time 字段从 []byte 字符串扫描，
+// 模拟 MySQL 驱动不配置 parseTime=true 时返回 []byte 的场景（原 bug：scan error on *time.Time）。
+func (qes *queryExecutorSuite) TestScanStructs_timeField_fromBytes() {
+	type Row struct {
+		CreatedAt time.Time  `db:"created_at"`
+		RetryAt   *time.Time `db:"retry_at"`
+	}
+	db, mock, err := sqlmock.New(sqlmock.ValueConverterOption(anyValueConverter{}))
+	qes.NoError(err)
+
+	datetimeBytes := []byte("2024-03-15 10:30:45")
+	mock.ExpectQuery(`SELECT \* FROM "items"`).
+		WillReturnRows(mock.NewRows([]string{"created_at", "retry_at"}).
+			AddRow(datetimeBytes, datetimeBytes).
+			AddRow(datetimeBytes, nil),
+		)
+
+	e := newQueryExecutor(db, nil, `SELECT * FROM "items"`)
+	var items []Row
+	qes.NoError(e.ScanStructs(&items))
+	qes.Len(items, 2)
+
+	want := time.Date(2024, 3, 15, 10, 30, 45, 0, time.UTC)
+	qes.True(items[0].CreatedAt.Equal(want))
+	qes.NotNil(items[0].RetryAt)
+	qes.True(items[0].RetryAt.Equal(want))
+	qes.Nil(items[1].RetryAt)
+}
+
+// TestScanStructs_timeField_fromDateOnlyBytes 验证仅含日期的 []byte（无时分秒）也能正确解析。
+func (qes *queryExecutorSuite) TestScanStructs_timeField_fromDateOnlyBytes() {
+	type Row struct {
+		Birthday  time.Time  `db:"birthday"`
+		ExpiredAt *time.Time `db:"expired_at"`
+	}
+	db, mock, err := sqlmock.New(sqlmock.ValueConverterOption(anyValueConverter{}))
+	qes.NoError(err)
+
+	dateBytes := []byte("2024-03-15")
+	mock.ExpectQuery(`SELECT \* FROM "items"`).
+		WillReturnRows(mock.NewRows([]string{"birthday", "expired_at"}).
+			AddRow(dateBytes, dateBytes),
+		)
+
+	e := newQueryExecutor(db, nil, `SELECT * FROM "items"`)
+	var items []Row
+	qes.NoError(e.ScanStructs(&items))
+	qes.Len(items, 1)
+
+	want := time.Date(2024, 3, 15, 0, 0, 0, 0, time.UTC)
+	qes.True(items[0].Birthday.Equal(want))
+	qes.NotNil(items[0].ExpiredAt)
+	qes.True(items[0].ExpiredAt.Equal(want))
+}
+
 func TestQueryExecutorSuite(t *testing.T) {
 	suite.Run(t, new(queryExecutorSuite))
 }
@@ -4,6 +4,7 @@ import (
 	"database/sql"
 	"encoding/json"
 	"reflect"
+	"time"

 	"git.fsdpf.net/go/db/internal/errors"
 	"git.fsdpf.net/go/db/internal/util"
@@ -65,72 +66,92 @@ func (s *scanner) GetRecords() ([]map[string]any, error) {
 }

 func (s *scanner) GetRecord() (record map[string]any, err error) {
-	// Setup columns, but only once.
-	if s.columns == nil || s.columnMap == nil {
+	if s.columns == nil {
 		colsType, err := s.rows.ColumnTypes()
 		if err != nil {
 			return nil, err
 		}
-
 		s.columns = make([]string, len(colsType))
-		s.columnMap = util.ColumnMap{}
-		for i := range colsType {
-			s.columns[i] = colsType[i].Name()
-
-			typ := colsType[i].ScanType()
-
-			// 强制日期时间为字符串
-			if typ == reflect.TypeOf(sql.NullTime{}) {
-				typ = reflect.TypeOf(sql.Null[[]uint8]{})
-			}
-
-			s.columnMap[colsType[i].Name()] = util.ColumnData{
-				ColumnName: colsType[i].Name(),
-				GoType:     typ,
+		s.columnMap = make(util.ColumnMap, len(colsType))
+		for i, ct := range colsType {
+			s.columns[i] = ct.Name()
+			s.columnMap[ct.Name()] = util.ColumnData{
+				ColumnName: ct.Name(),
+				GoType:     ct.ScanType(),
 			}
 		}
 	}

-	scans := make([]interface{}, len(s.columns))
-
+	scans := make([]any, len(s.columns))
 	for i, col := range s.columns {
-		scans[i] = reflect.New(s.columnMap[col].GoType).Interface()
+		if isNumericKind(s.columnMap[col].GoType.Kind()) {
+			// **T：NULL 时内层指针为 nil，否则持有精确数值类型
+			scans[i] = reflect.New(reflect.PointerTo(s.columnMap[col].GoType)).Interface()
+		} else {
+			scans[i] = new(any)
+		}
 	}

 	if err := s.rows.Scan(scans...); err != nil {
 		return nil, err
 	}

-	record = make(map[string]interface{}, len(s.columns))
+	record = make(map[string]any, len(s.columns))
 	for i, col := range s.columns {
-		var vv any
-		switch v := scans[i].(type) {
-		case *sql.Null[[]uint8]: // 强制日期时间为字符串
-			if vv, err = v.Value(); err == nil && vv != nil {
-				vv = string(vv.([]uint8))
-			}
-		case *sql.RawBytes:
-			if len(*v) > 1 {
-				if rune((*v)[0]) == rune('[') || rune((*v)[0]) == rune('{') {
-					err = json.Unmarshal(*v, &vv)
-				} else {
-					vv = string(*v)
-				}
+		if isNumericKind(s.columnMap[col].GoType.Kind()) {
+			inner := reflect.ValueOf(scans[i]).Elem() // *T
+			if inner.IsNil() {
+				record[col] = nil
 			} else {
-				vv = string(*v)
+				record[col] = inner.Elem().Interface()
 			}
+			continue
+		}
+
+		v := *(scans[i].(*any))
+		switch val := v.(type) {
+		case time.Time:
+			layout := time.DateTime
+			if val.Hour() == 0 && val.Minute() == 0 && val.Second() == 0 && val.Nanosecond() == 0 {
+				layout = time.DateOnly
+			}
+			record[col] = val.Format(layout)
+		case []byte:
+			if len(val) > 0 && (val[0] == '[' || val[0] == '{') {
+				var parsed any
+				if json.Unmarshal(val, &parsed) == nil {
+					record[col] = parsed
+					continue
+				}
+			}
+			record[col] = string(val)
+		case sql.RawBytes:
+			if len(val) > 0 && (val[0] == '[' || val[0] == '{') {
+				var parsed any
+				if json.Unmarshal(val, &parsed) == nil {
+					record[col] = parsed
+					continue
+				}
+			}
+			record[col] = string(val)
 		default:
-			vv = reflect.Indirect(reflect.ValueOf(v)).Interface()
+			record[col] = v
 		}
-		if err != nil {
-			return
-		}
-		record[col] = vv
 	}

 	return record, s.Err()
 }

+func isNumericKind(k reflect.Kind) bool {
+	switch k {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
+		reflect.Float32, reflect.Float64:
+		return true
+	}
+	return false
+}
+
 // ScanStruct will scan the current row into i.
 func (s *scanner) ScanStruct(i interface{}) error {
 	// Setup columnMap and columns, but only once.
@@ -177,8 +198,14 @@ func (s *scanner) ScanStruct(i interface{}) error {
 	record := map[string]interface{}{}
 	for index, col := range s.columns {
 		if pi, ok := scans[index].(*interface{}); ok {
-			raw := toJSONRawMessage(*pi)
-			record[col] = &raw
+			v := *pi
+			if t, isTime := v.(time.Time); isTime {
+				// time.Time 直接存储，避免格式化字符串丢失纳秒和时区
+				record[col] = t
+			} else {
+				raw := toJSONRawMessage(v)
+				record[col] = &raw
+			}
 		} else {
 			record[col] = scans[index]
 		}
@@ -217,21 +244,8 @@ func (s *scanner) ScanVal(i interface{}) error {
 		if err := s.rows.Scan(&raw); err != nil {
 			return err
 		}
-		switch rv := raw.(type) {
-		case []byte:
-			*v = append([]byte(nil), rv...)
-		case sql.RawBytes:
-			*v = append([]byte(nil), []byte(rv)...)
-		case string:
-			*v = []byte(rv)
-		default:
-			if raw != nil {
-				var err error
-				*v, err = json.Marshal(raw)
-				if err != nil {
-					return err
-				}
-			}
+		if msg := toJSONRawMessage(raw); msg != nil {
+			*v = []byte(*msg)
 		}
 	default:
 		// 指针-结构体且未实现 sql.Scanner：通过 JSON 中间层转换
@@ -321,8 +335,16 @@ func toJSONRawMessage(v interface{}) *json.RawMessage {
 	switch s := v.(type) {
 	case []byte:
 		raw = append(json.RawMessage(nil), s...)
+	case sql.RawBytes:
+		raw = append(json.RawMessage(nil), s...)
 	case string:
 		raw = json.RawMessage(s)
+	case time.Time:
+		layout := time.DateTime
+		if s.Hour() == 0 && s.Minute() == 0 && s.Second() == 0 && s.Nanosecond() == 0 {
+			layout = time.DateOnly
+		}
+		raw = json.RawMessage(s.Format(layout))
 	default:
 		b, _ := json.Marshal(v)
 		raw = b
@@ -342,14 +364,24 @@ func createColumnScans(cols []string, cm util.ColumnMap) (scans []interface{}, e
 		// 处理 converting NULL to string is unsupported
 		// 前面将 string 和 int 类型转为了 *string 和 *int
 		switch data.GoType.Kind() {
-		case reflect.String,
-			reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+			reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
 			reflect.Float32, reflect.Float64,
 			reflect.Bool:
 			scans = append(scans, reflect.New(reflect.PointerTo(data.GoType)).Interface())
-		case reflect.Map, reflect.Slice, reflect.Struct:
-			// 使用 *interface{} 接受任意驱动值（兼容 DuckDB 返回 map[string]interface{}）
-			scans = append(scans, new(interface{}))
+		case reflect.String, reflect.Map, reflect.Slice, reflect.Struct:
+			// string 也用 *interface{}：DuckDB 的 MAP/LIST 列 ScanType() 可能报告为 string，
+			// 但驱动实际返回 map[string]interface{} 或 []interface{}，必须用 *interface{} 接收。
+			scans = append(scans, new(any))
+		case reflect.Ptr:
+			// 指针到结构体（如 *time.Time）：驱动可能返回 []byte，
+			// 用 **struct 作扫描目标时 database/sql 无法完成转换，改用 *interface{} 接收。
+			// 指针到基础类型（*string、*int 等）仍用 **T，database/sql 可自行处理。
+			if data.GoType.Elem().Kind() == reflect.Struct {
+				scans = append(scans, new(any))
+			} else {
+				scans = append(scans, reflect.New(data.GoType).Interface())
+			}
 		default:
 			scans = append(scans, reflect.New(data.GoType).Interface())
 		}