459 lines
12 KiB
Go
459 lines
12 KiB
Go
// 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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"strconv"
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"strings"
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"github.com/go-xorm/builder"
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"github.com/go-xorm/core"
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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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defer session.resetStatement()
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if session.IsAutoClose {
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defer session.Close()
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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 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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session.Statement.setRefValue(pv.Elem())
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} else {
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//return errors.New("slice type")
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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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session.Statement.setRefValue(pv.Elem())
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} else {
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//return errors.New("slice type")
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tp = tpNonStruct
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}
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}
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var table = session.Statement.RefTable
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var addedTableName = (len(session.Statement.JoinStr) > 0)
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var autoCond builder.Cond
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if tp == tpStruct {
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if !session.Statement.noAutoCondition && len(condiBean) > 0 {
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var err error
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autoCond, err = session.Statement.buildConds(table, condiBean[0], true, true, false, true, addedTableName)
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if err != nil {
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panic(err)
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}
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} else {
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// !oinume! Add "<col> IS NULL" to WHERE whatever condiBean is given.
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// See https://github.com/go-xorm/xorm/issues/179
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if col := table.DeletedColumn(); col != nil && !session.Statement.unscoped { // tag "deleted" is enabled
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var colName = session.Engine.Quote(col.Name)
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if addedTableName {
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var nm = session.Statement.TableName()
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if len(session.Statement.TableAlias) > 0 {
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nm = session.Statement.TableAlias
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}
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colName = session.Engine.Quote(nm) + "." + colName
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}
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if session.Engine.dialect.DBType() == core.MSSQL {
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autoCond = builder.IsNull{colName}
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} else {
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autoCond = builder.IsNull{colName}.Or(builder.Eq{colName: "0001-01-01 00:00:00"})
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}
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}
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}
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}
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var sqlStr string
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var args []interface{}
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if session.Statement.RawSQL == "" {
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if len(session.Statement.TableName()) <= 0 {
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return ErrTableNotFound
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}
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var columnStr = session.Statement.ColumnStr
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if len(session.Statement.selectStr) > 0 {
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columnStr = session.Statement.selectStr
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} else {
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if session.Statement.JoinStr == "" {
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if columnStr == "" {
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if session.Statement.GroupByStr != "" {
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columnStr = session.Statement.Engine.Quote(strings.Replace(session.Statement.GroupByStr, ",", session.Engine.Quote(","), -1))
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} else {
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columnStr = session.Statement.genColumnStr()
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}
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}
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} else {
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if columnStr == "" {
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if session.Statement.GroupByStr != "" {
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columnStr = session.Statement.Engine.Quote(strings.Replace(session.Statement.GroupByStr, ",", session.Engine.Quote(","), -1))
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} else {
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columnStr = "*"
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}
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}
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}
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if columnStr == "" {
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columnStr = "*"
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}
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}
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condSQL, condArgs, _ := builder.ToSQL(session.Statement.cond.And(autoCond))
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args = append(session.Statement.joinArgs, condArgs...)
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sqlStr = session.Statement.genSelectSQL(columnStr, condSQL)
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// for mssql and use limit
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qs := strings.Count(sqlStr, "?")
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if len(args)*2 == qs {
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args = append(args, args...)
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}
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} else {
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sqlStr = session.Statement.RawSQL
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args = session.Statement.RawParams
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}
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var err error
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if session.canCache() {
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if cacher := session.Engine.getCacher2(table); cacher != nil &&
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!session.Statement.IsDistinct &&
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!session.Statement.unscoped {
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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.Warn("Cache Find Failed")
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}
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}
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if sliceValue.Kind() != reflect.Map {
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return session.noCacheFind(sliceValue, sqlStr, args...)
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}
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resultsSlice, err := session.query(sqlStr, args...)
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if err != nil {
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return err
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}
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keyType := sliceValue.Type().Key()
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for _, results := range resultsSlice {
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var newValue reflect.Value
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if sliceElementType.Kind() == reflect.Ptr {
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newValue = reflect.New(sliceElementType.Elem())
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} else {
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newValue = reflect.New(sliceElementType)
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}
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err := session.scanMapIntoStruct(newValue.Interface(), results)
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if err != nil {
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return err
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}
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var key interface{}
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// if there is only one pk, we can put the id as map key.
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if len(table.PrimaryKeys) == 1 {
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key, err = str2PK(string(results[table.PrimaryKeys[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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panic("don't support multiple primary key's map has non-slice key type")
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} else {
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var keys core.PK = make([]interface{}, 0, len(table.PrimaryKeys))
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for _, pk := range table.PrimaryKeys {
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skey, err := str2PK(string(results[pk]), keyType)
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if err != nil {
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return err
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}
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keys = append(keys, skey)
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}
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key = keys
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}
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}
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if sliceElementType.Kind() == reflect.Ptr {
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sliceValue.SetMapIndex(reflect.ValueOf(key), reflect.ValueOf(newValue.Interface()))
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} else {
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sliceValue.SetMapIndex(reflect.ValueOf(key), reflect.Indirect(reflect.ValueOf(newValue.Interface())))
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}
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}
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return nil
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}
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func (session *Session) noCacheFind(sliceValue reflect.Value, sqlStr string, args ...interface{}) error {
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var rawRows *core.Rows
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var err error
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session.queryPreprocess(&sqlStr, args...)
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if session.IsAutoCommit {
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_, rawRows, err = session.innerQuery(sqlStr, args...)
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} else {
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rawRows, err = session.Tx.Query(sqlStr, args...)
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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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defer rawRows.Close()
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fields, err := rawRows.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() reflect.Value
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sliceElementType := sliceValue.Type().Elem()
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if sliceElementType.Kind() == reflect.Ptr {
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newElemFunc = func() reflect.Value {
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return reflect.New(sliceElementType.Elem())
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}
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} else {
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newElemFunc = func() reflect.Value {
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return reflect.New(sliceElementType)
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}
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}
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var sliceValueSetFunc func(*reflect.Value)
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if sliceValue.Kind() == reflect.Slice {
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if sliceElementType.Kind() == reflect.Ptr {
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sliceValueSetFunc = func(newValue *reflect.Value) {
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sliceValue.Set(reflect.Append(sliceValue, reflect.ValueOf(newValue.Interface())))
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}
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} else {
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sliceValueSetFunc = func(newValue *reflect.Value) {
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sliceValue.Set(reflect.Append(sliceValue, reflect.Indirect(reflect.ValueOf(newValue.Interface()))))
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}
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}
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}
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var newValue = newElemFunc()
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dataStruct := rValue(newValue.Interface())
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if dataStruct.Kind() == reflect.Struct {
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return session.rows2Beans(rawRows, fields, len(fields), session.Engine.autoMapType(dataStruct), newElemFunc, sliceValueSetFunc)
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}
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for rawRows.Next() {
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var newValue = newElemFunc()
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bean := newValue.Interface()
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if err := rawRows.Scan(bean); err != nil {
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return err
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}
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sliceValueSetFunc(&newValue)
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}
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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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indexNoCase(sqlStr, "having") != -1 ||
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indexNoCase(sqlStr, "group by") != -1 {
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return ErrCacheFailed
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}
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for _, filter := range session.Engine.dialect.Filters() {
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sqlStr = filter.Do(sqlStr, session.Engine.dialect, session.Statement.RefTable)
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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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tableName := session.Statement.TableName()
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table := session.Statement.RefTable
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cacher := session.Engine.getCacher2(table)
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ids, err := core.GetCacheSql(cacher, tableName, newsql, args)
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if err != nil {
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rows, err := session.DB().Query(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([]core.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.Debug("[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 core.PK = make([]interface{}, len(table.PrimaryKeys))
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for i, col := range table.PKColumns() {
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if col.SQLType.IsNumeric() {
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n, err := strconv.ParseInt(res[i], 10, 64)
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if err != nil {
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return err
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}
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pk[i] = n
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} else if col.SQLType.IsText() {
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pk[i] = res[i]
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} else {
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return errors.New("not supported")
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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.Debug("[cacheFind] cache sql:", ids, tableName, newsql, args)
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err = core.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.Debug("[cacheFind] cache hit sql:", 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 []core.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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if bean == nil {
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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.Debug("[cacheFind] cache hit bean:", tableName, id, bean)
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pk := session.Engine.IdOf(bean)
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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.Error("[cacheFind] error cache", 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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newSession := session.Engine.NewSession()
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defer newSession.Close()
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slices := reflect.New(reflect.SliceOf(t))
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beans := slices.Interface()
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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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newSession.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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newSession.Or(cond)
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}
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}
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err = newSession.NoCache().Find(beans)
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if err != nil {
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return err
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}
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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 := session.Engine.IdOfV(rv)
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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.Debug("[cacheFind] cache bean:", 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.Warn("[cacheFind] cache no hit:", 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 core.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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