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338 lines
6.7 KiB
338 lines
6.7 KiB
// Copyright 2019 The Xorm Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package core
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import (
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"database/sql"
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"errors"
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"reflect"
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"sync"
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)
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type Rows struct {
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*sql.Rows
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db *DB
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}
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func (rs *Rows) ToMapString() ([]map[string]string, error) {
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cols, err := rs.Columns()
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if err != nil {
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return nil, err
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}
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var results = make([]map[string]string, 0, 10)
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for rs.Next() {
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var record = make(map[string]string, len(cols))
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err = rs.ScanMap(&record)
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if err != nil {
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return nil, err
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}
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results = append(results, record)
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}
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return results, nil
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}
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// scan data to a struct's pointer according field index
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func (rs *Rows) ScanStructByIndex(dest ...interface{}) error {
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if len(dest) == 0 {
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return errors.New("at least one struct")
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}
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vvvs := make([]reflect.Value, len(dest))
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for i, s := range dest {
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vv := reflect.ValueOf(s)
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if vv.Kind() != reflect.Ptr || vv.Elem().Kind() != reflect.Struct {
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return errors.New("dest should be a struct's pointer")
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}
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vvvs[i] = vv.Elem()
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}
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cols, err := rs.Columns()
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if err != nil {
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return err
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}
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newDest := make([]interface{}, len(cols))
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var i = 0
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for _, vvv := range vvvs {
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for j := 0; j < vvv.NumField(); j++ {
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newDest[i] = vvv.Field(j).Addr().Interface()
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i = i + 1
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}
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}
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return rs.Rows.Scan(newDest...)
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}
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var (
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fieldCache = make(map[reflect.Type]map[string]int)
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fieldCacheMutex sync.RWMutex
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)
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func fieldByName(v reflect.Value, name string) reflect.Value {
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t := v.Type()
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fieldCacheMutex.RLock()
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cache, ok := fieldCache[t]
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fieldCacheMutex.RUnlock()
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if !ok {
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cache = make(map[string]int)
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for i := 0; i < v.NumField(); i++ {
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cache[t.Field(i).Name] = i
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}
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fieldCacheMutex.Lock()
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fieldCache[t] = cache
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fieldCacheMutex.Unlock()
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}
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if i, ok := cache[name]; ok {
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return v.Field(i)
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}
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return reflect.Zero(t)
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}
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// scan data to a struct's pointer according field name
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func (rs *Rows) ScanStructByName(dest interface{}) error {
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vv := reflect.ValueOf(dest)
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if vv.Kind() != reflect.Ptr || vv.Elem().Kind() != reflect.Struct {
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return errors.New("dest should be a struct's pointer")
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}
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cols, err := rs.Columns()
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if err != nil {
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return err
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}
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newDest := make([]interface{}, len(cols))
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var v EmptyScanner
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for j, name := range cols {
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f := fieldByName(vv.Elem(), rs.db.Mapper.Table2Obj(name))
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if f.IsValid() {
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newDest[j] = f.Addr().Interface()
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} else {
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newDest[j] = &v
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}
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}
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return rs.Rows.Scan(newDest...)
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}
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// scan data to a slice's pointer, slice's length should equal to columns' number
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func (rs *Rows) ScanSlice(dest interface{}) error {
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vv := reflect.ValueOf(dest)
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if vv.Kind() != reflect.Ptr || vv.Elem().Kind() != reflect.Slice {
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return errors.New("dest should be a slice's pointer")
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}
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vvv := vv.Elem()
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cols, err := rs.Columns()
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if err != nil {
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return err
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}
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newDest := make([]interface{}, len(cols))
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for j := 0; j < len(cols); j++ {
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if j >= vvv.Len() {
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newDest[j] = reflect.New(vvv.Type().Elem()).Interface()
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} else {
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newDest[j] = vvv.Index(j).Addr().Interface()
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}
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}
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err = rs.Rows.Scan(newDest...)
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if err != nil {
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return err
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}
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srcLen := vvv.Len()
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for i := srcLen; i < len(cols); i++ {
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vvv = reflect.Append(vvv, reflect.ValueOf(newDest[i]).Elem())
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}
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return nil
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}
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// scan data to a map's pointer
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func (rs *Rows) ScanMap(dest interface{}) error {
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vv := reflect.ValueOf(dest)
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if vv.Kind() != reflect.Ptr || vv.Elem().Kind() != reflect.Map {
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return errors.New("dest should be a map's pointer")
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}
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cols, err := rs.Columns()
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if err != nil {
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return err
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}
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newDest := make([]interface{}, len(cols))
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vvv := vv.Elem()
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for i, _ := range cols {
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newDest[i] = rs.db.reflectNew(vvv.Type().Elem()).Interface()
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}
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err = rs.Rows.Scan(newDest...)
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if err != nil {
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return err
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}
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for i, name := range cols {
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vname := reflect.ValueOf(name)
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vvv.SetMapIndex(vname, reflect.ValueOf(newDest[i]).Elem())
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}
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return nil
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}
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type Row struct {
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rows *Rows
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// One of these two will be non-nil:
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err error // deferred error for easy chaining
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}
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// ErrorRow return an error row
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func ErrorRow(err error) *Row {
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return &Row{
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err: err,
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}
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}
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// NewRow from rows
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func NewRow(rows *Rows, err error) *Row {
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return &Row{rows, err}
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}
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func (row *Row) Columns() ([]string, error) {
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if row.err != nil {
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return nil, row.err
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}
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return row.rows.Columns()
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}
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func (row *Row) Scan(dest ...interface{}) error {
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if row.err != nil {
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return row.err
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}
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defer row.rows.Close()
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for _, dp := range dest {
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if _, ok := dp.(*sql.RawBytes); ok {
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return errors.New("sql: RawBytes isn't allowed on Row.Scan")
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}
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}
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if !row.rows.Next() {
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if err := row.rows.Err(); err != nil {
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return err
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}
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return sql.ErrNoRows
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}
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err := row.rows.Scan(dest...)
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if err != nil {
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return err
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}
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// Make sure the query can be processed to completion with no errors.
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return row.rows.Close()
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}
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func (row *Row) ScanStructByName(dest interface{}) error {
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if row.err != nil {
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return row.err
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}
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defer row.rows.Close()
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if !row.rows.Next() {
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if err := row.rows.Err(); err != nil {
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return err
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}
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return sql.ErrNoRows
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}
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err := row.rows.ScanStructByName(dest)
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if err != nil {
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return err
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}
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// Make sure the query can be processed to completion with no errors.
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return row.rows.Close()
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}
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func (row *Row) ScanStructByIndex(dest interface{}) error {
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if row.err != nil {
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return row.err
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}
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defer row.rows.Close()
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if !row.rows.Next() {
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if err := row.rows.Err(); err != nil {
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return err
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}
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return sql.ErrNoRows
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}
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err := row.rows.ScanStructByIndex(dest)
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if err != nil {
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return err
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}
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// Make sure the query can be processed to completion with no errors.
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return row.rows.Close()
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}
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// scan data to a slice's pointer, slice's length should equal to columns' number
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func (row *Row) ScanSlice(dest interface{}) error {
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if row.err != nil {
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return row.err
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}
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defer row.rows.Close()
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if !row.rows.Next() {
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if err := row.rows.Err(); err != nil {
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return err
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}
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return sql.ErrNoRows
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}
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err := row.rows.ScanSlice(dest)
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if err != nil {
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return err
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}
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// Make sure the query can be processed to completion with no errors.
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return row.rows.Close()
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}
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// scan data to a map's pointer
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func (row *Row) ScanMap(dest interface{}) error {
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if row.err != nil {
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return row.err
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}
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defer row.rows.Close()
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if !row.rows.Next() {
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if err := row.rows.Err(); err != nil {
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return err
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}
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return sql.ErrNoRows
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}
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err := row.rows.ScanMap(dest)
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if err != nil {
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return err
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}
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// Make sure the query can be processed to completion with no errors.
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return row.rows.Close()
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}
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func (row *Row) ToMapString() (map[string]string, error) {
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cols, err := row.Columns()
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if err != nil {
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return nil, err
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}
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var record = make(map[string]string, len(cols))
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err = row.ScanMap(&record)
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if err != nil {
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return nil, err
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}
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return record, nil
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}
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