494 lines
13 KiB
Go
Vendored
494 lines
13 KiB
Go
Vendored
// Copyright 2016 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 xorm
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import (
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"errors"
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"fmt"
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"reflect"
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"xorm.io/builder"
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"xorm.io/xorm/caches"
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"xorm.io/xorm/internal/statements"
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"xorm.io/xorm/internal/utils"
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"xorm.io/xorm/schemas"
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)
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const (
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tpStruct = iota
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tpNonStruct
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)
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// Find retrieve records from table, condiBeans's non-empty fields
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// are conditions. beans could be []Struct, []*Struct, map[int64]Struct
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// map[int64]*Struct
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func (session *Session) Find(rowsSlicePtr interface{}, condiBean ...interface{}) error {
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if session.isAutoClose {
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defer session.Close()
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}
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return session.find(rowsSlicePtr, condiBean...)
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}
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// FindAndCount find the results and also return the counts
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func (session *Session) FindAndCount(rowsSlicePtr interface{}, condiBean ...interface{}) (int64, error) {
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if session.isAutoClose {
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defer session.Close()
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}
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session.autoResetStatement = false
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err := session.find(rowsSlicePtr, condiBean...)
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if err != nil {
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return 0, err
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}
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sliceValue := reflect.Indirect(reflect.ValueOf(rowsSlicePtr))
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if sliceValue.Kind() != reflect.Slice && sliceValue.Kind() != reflect.Map {
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return 0, errors.New("needs a pointer to a slice or a map")
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}
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sliceElementType := sliceValue.Type().Elem()
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if sliceElementType.Kind() == reflect.Ptr {
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sliceElementType = sliceElementType.Elem()
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}
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session.autoResetStatement = true
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if session.statement.SelectStr != "" {
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session.statement.SelectStr = ""
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}
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if len(session.statement.ColumnMap) > 0 {
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session.statement.ColumnMap = []string{}
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}
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if session.statement.OrderStr != "" {
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session.statement.OrderStr = ""
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}
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if session.statement.LimitN != nil {
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session.statement.LimitN = nil
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}
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if session.statement.Start > 0 {
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session.statement.Start = 0
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}
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// session has stored the conditions so we use `unscoped` to avoid duplicated condition.
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return session.Unscoped().Count(reflect.New(sliceElementType).Interface())
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}
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func (session *Session) find(rowsSlicePtr interface{}, condiBean ...interface{}) error {
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defer session.resetStatement()
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if session.statement.LastError != nil {
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return session.statement.LastError
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}
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sliceValue := reflect.Indirect(reflect.ValueOf(rowsSlicePtr))
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var isSlice = sliceValue.Kind() == reflect.Slice
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var isMap = sliceValue.Kind() == reflect.Map
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if !isSlice && !isMap {
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return errors.New("needs a pointer to a slice or a map")
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}
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sliceElementType := sliceValue.Type().Elem()
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var tp = tpStruct
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if session.statement.RefTable == nil {
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if sliceElementType.Kind() == reflect.Ptr {
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if sliceElementType.Elem().Kind() == reflect.Struct {
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pv := reflect.New(sliceElementType.Elem())
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if err := session.statement.SetRefValue(pv); err != nil {
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return err
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}
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} else {
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tp = tpNonStruct
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}
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} else if sliceElementType.Kind() == reflect.Struct {
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pv := reflect.New(sliceElementType)
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if err := session.statement.SetRefValue(pv); err != nil {
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return err
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}
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} else {
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tp = tpNonStruct
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}
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}
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var (
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table = session.statement.RefTable
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addedTableName = (len(session.statement.JoinStr) > 0)
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autoCond builder.Cond
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)
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if tp == tpStruct {
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if !session.statement.NoAutoCondition && len(condiBean) > 0 {
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condTable, err := session.engine.tagParser.Parse(reflect.ValueOf(condiBean[0]))
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if err != nil {
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return err
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}
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autoCond, err = session.statement.BuildConds(condTable, condiBean[0], true, true, false, true, addedTableName)
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if err != nil {
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return err
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}
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} else {
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if col := table.DeletedColumn(); col != nil && !session.statement.GetUnscoped() { // tag "deleted" is enabled
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autoCond = session.statement.CondDeleted(col)
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}
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}
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}
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// if it's a map with Cols but primary key not in column list, we still need the primary key
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if isMap && !session.statement.ColumnMap.IsEmpty() {
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for _, k := range session.statement.RefTable.PrimaryKeys {
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session.statement.ColumnMap.Add(k)
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}
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}
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sqlStr, args, err := session.statement.GenFindSQL(autoCond)
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if err != nil {
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return err
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}
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if session.statement.ColumnMap.IsEmpty() && session.canCache() {
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if cacher := session.engine.GetCacher(session.statement.TableName()); cacher != nil &&
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!session.statement.IsDistinct &&
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!session.statement.GetUnscoped() {
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err = session.cacheFind(sliceElementType, sqlStr, rowsSlicePtr, args...)
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if err != ErrCacheFailed {
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return err
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}
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err = nil // !nashtsai! reset err to nil for ErrCacheFailed
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session.engine.logger.Warnf("Cache Find Failed")
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}
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}
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return session.noCacheFind(table, sliceValue, sqlStr, args...)
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}
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func (session *Session) noCacheFind(table *schemas.Table, containerValue reflect.Value, sqlStr string, args ...interface{}) error {
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rows, err := session.queryRows(sqlStr, args...)
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if err != nil {
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return err
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}
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defer rows.Close()
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fields, err := rows.Columns()
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if err != nil {
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return err
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}
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var newElemFunc func(fields []string) reflect.Value
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elemType := containerValue.Type().Elem()
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var isPointer bool
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if elemType.Kind() == reflect.Ptr {
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isPointer = true
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elemType = elemType.Elem()
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}
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if elemType.Kind() == reflect.Ptr {
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return errors.New("pointer to pointer is not supported")
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}
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newElemFunc = func(fields []string) reflect.Value {
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switch elemType.Kind() {
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case reflect.Slice:
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slice := reflect.MakeSlice(elemType, len(fields), len(fields))
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x := reflect.New(slice.Type())
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x.Elem().Set(slice)
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return x
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case reflect.Map:
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mp := reflect.MakeMap(elemType)
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x := reflect.New(mp.Type())
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x.Elem().Set(mp)
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return x
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}
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return reflect.New(elemType)
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}
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var containerValueSetFunc func(*reflect.Value, schemas.PK) error
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if containerValue.Kind() == reflect.Slice {
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containerValueSetFunc = func(newValue *reflect.Value, pk schemas.PK) error {
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if isPointer {
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containerValue.Set(reflect.Append(containerValue, newValue.Elem().Addr()))
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} else {
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containerValue.Set(reflect.Append(containerValue, newValue.Elem()))
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}
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return nil
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}
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} else {
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keyType := containerValue.Type().Key()
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if len(table.PrimaryKeys) == 0 {
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return errors.New("don't support multiple primary key's map has non-slice key type")
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}
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if len(table.PrimaryKeys) > 1 && keyType.Kind() != reflect.Slice {
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return errors.New("don't support multiple primary key's map has non-slice key type")
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}
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containerValueSetFunc = func(newValue *reflect.Value, pk schemas.PK) error {
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keyValue := reflect.New(keyType)
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err := convertPKToValue(table, keyValue.Interface(), pk)
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if err != nil {
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return err
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}
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if isPointer {
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containerValue.SetMapIndex(keyValue.Elem(), newValue.Elem().Addr())
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} else {
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containerValue.SetMapIndex(keyValue.Elem(), newValue.Elem())
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}
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return nil
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}
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}
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if elemType.Kind() == reflect.Struct {
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var newValue = newElemFunc(fields)
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dataStruct := utils.ReflectValue(newValue.Interface())
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tb, err := session.engine.tagParser.ParseWithCache(dataStruct)
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if err != nil {
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return err
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}
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err = session.rows2Beans(rows, fields, tb, newElemFunc, containerValueSetFunc)
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rows.Close()
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if err != nil {
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return err
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}
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return session.executeProcessors()
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}
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for rows.Next() {
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var newValue = newElemFunc(fields)
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bean := newValue.Interface()
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switch elemType.Kind() {
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case reflect.Slice:
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err = rows.ScanSlice(bean)
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case reflect.Map:
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err = rows.ScanMap(bean)
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default:
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err = rows.Scan(bean)
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}
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if err != nil {
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return err
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}
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if err := containerValueSetFunc(&newValue, nil); err != nil {
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return err
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}
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}
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return nil
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}
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func convertPKToValue(table *schemas.Table, dst interface{}, pk schemas.PK) error {
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cols := table.PKColumns()
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if len(cols) == 1 {
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return convertAssign(dst, pk[0])
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}
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dst = pk
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return nil
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}
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func (session *Session) cacheFind(t reflect.Type, sqlStr string, rowsSlicePtr interface{}, args ...interface{}) (err error) {
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if !session.canCache() ||
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utils.IndexNoCase(sqlStr, "having") != -1 ||
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utils.IndexNoCase(sqlStr, "group by") != -1 {
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return ErrCacheFailed
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}
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tableName := session.statement.TableName()
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cacher := session.engine.cacherMgr.GetCacher(tableName)
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if cacher == nil {
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return nil
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}
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for _, filter := range session.engine.dialect.Filters() {
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sqlStr = filter.Do(sqlStr)
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}
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newsql := session.statement.ConvertIDSQL(sqlStr)
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if newsql == "" {
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return ErrCacheFailed
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}
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table := session.statement.RefTable
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ids, err := caches.GetCacheSql(cacher, tableName, newsql, args)
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if err != nil {
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rows, err := session.queryRows(newsql, args...)
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if err != nil {
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return err
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}
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defer rows.Close()
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var i int
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ids = make([]schemas.PK, 0)
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for rows.Next() {
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i++
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if i > 500 {
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session.engine.logger.Debugf("[cacheFind] ids length > 500, no cache")
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return ErrCacheFailed
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}
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var res = make([]string, len(table.PrimaryKeys))
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err = rows.ScanSlice(&res)
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if err != nil {
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return err
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}
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var pk schemas.PK = make([]interface{}, len(table.PrimaryKeys))
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for i, col := range table.PKColumns() {
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pk[i], err = col.ConvertID(res[i])
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if err != nil {
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return err
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}
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}
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ids = append(ids, pk)
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}
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session.engine.logger.Debugf("[cache] cache sql: %v, %v, %v, %v, %v", ids, tableName, sqlStr, newsql, args)
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err = caches.PutCacheSql(cacher, ids, tableName, newsql, args)
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if err != nil {
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return err
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}
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} else {
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session.engine.logger.Debugf("[cache] cache hit sql: %v, %v, %v, %v", tableName, sqlStr, newsql, args)
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}
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sliceValue := reflect.Indirect(reflect.ValueOf(rowsSlicePtr))
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ididxes := make(map[string]int)
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var ides []schemas.PK
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var temps = make([]interface{}, len(ids))
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for idx, id := range ids {
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sid, err := id.ToString()
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if err != nil {
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return err
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}
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bean := cacher.GetBean(tableName, sid)
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// fix issue #894
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isHit := func() (ht bool) {
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if bean == nil {
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ht = false
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return
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}
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ckb := reflect.ValueOf(bean).Elem().Type()
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ht = ckb == t
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if !ht && t.Kind() == reflect.Ptr {
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ht = t.Elem() == ckb
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}
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return
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}
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if !isHit() {
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ides = append(ides, id)
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ididxes[sid] = idx
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} else {
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session.engine.logger.Debugf("[cache] cache hit bean: %v, %v, %v", tableName, id, bean)
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pk, err := table.IDOfV(reflect.ValueOf(bean))
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if err != nil {
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return err
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}
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xid, err := pk.ToString()
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if err != nil {
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return err
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}
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if sid != xid {
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session.engine.logger.Errorf("[cache] error cache: %v, %v, %v", xid, sid, bean)
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return ErrCacheFailed
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}
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temps[idx] = bean
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}
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}
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if len(ides) > 0 {
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slices := reflect.New(reflect.SliceOf(t))
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beans := slices.Interface()
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statement := session.statement
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session.statement = statements.NewStatement(
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session.engine.dialect,
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session.engine.tagParser,
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session.engine.DatabaseTZ,
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)
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if len(table.PrimaryKeys) == 1 {
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ff := make([]interface{}, 0, len(ides))
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for _, ie := range ides {
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ff = append(ff, ie[0])
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}
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session.In("`"+table.PrimaryKeys[0]+"`", ff...)
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} else {
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for _, ie := range ides {
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cond := builder.NewCond()
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for i, name := range table.PrimaryKeys {
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cond = cond.And(builder.Eq{"`" + name + "`": ie[i]})
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}
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session.Or(cond)
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}
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}
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err = session.NoCache().Table(tableName).find(beans)
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if err != nil {
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return err
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}
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session.statement = statement
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vs := reflect.Indirect(reflect.ValueOf(beans))
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for i := 0; i < vs.Len(); i++ {
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rv := vs.Index(i)
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if rv.Kind() != reflect.Ptr {
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rv = rv.Addr()
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}
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id, err := table.IDOfV(rv)
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if err != nil {
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return err
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}
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sid, err := id.ToString()
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if err != nil {
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return err
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}
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bean := rv.Interface()
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temps[ididxes[sid]] = bean
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session.engine.logger.Debugf("[cache] cache bean: %v, %v, %v, %v", tableName, id, bean, temps)
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cacher.PutBean(tableName, sid, bean)
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}
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}
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for j := 0; j < len(temps); j++ {
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bean := temps[j]
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if bean == nil {
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session.engine.logger.Warnf("[cache] cache no hit: %v, %v, %v", tableName, ids[j], temps)
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// return errors.New("cache error") // !nashtsai! no need to return error, but continue instead
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continue
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}
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if sliceValue.Kind() == reflect.Slice {
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if t.Kind() == reflect.Ptr {
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sliceValue.Set(reflect.Append(sliceValue, reflect.ValueOf(bean)))
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} else {
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sliceValue.Set(reflect.Append(sliceValue, reflect.Indirect(reflect.ValueOf(bean))))
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}
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} else if sliceValue.Kind() == reflect.Map {
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var key = ids[j]
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keyType := sliceValue.Type().Key()
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var ikey interface{}
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if len(key) == 1 {
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ikey, err = str2PK(fmt.Sprintf("%v", key[0]), keyType)
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if err != nil {
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return err
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}
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} else {
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if keyType.Kind() != reflect.Slice {
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return errors.New("table have multiple primary keys, key is not schemas.PK or slice")
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}
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ikey = key
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}
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if t.Kind() == reflect.Ptr {
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sliceValue.SetMapIndex(reflect.ValueOf(ikey), reflect.ValueOf(bean))
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} else {
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sliceValue.SetMapIndex(reflect.ValueOf(ikey), reflect.Indirect(reflect.ValueOf(bean)))
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}
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}
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}
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return nil
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}
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