gitea/vendor/github.com/go-xorm/xorm/session_find.go
Lunny Xiao 980dd0bf51 Update xorm and dependencies vendor for feature to dump to other database (#565)
* update xorm and dependencies vendor for feature to dump to other database

* fix golint
2017-01-03 16:20:28 +08:00

459 lines
12 KiB
Go

// Copyright 2016 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xorm
import (
"errors"
"fmt"
"reflect"
"strconv"
"strings"
"github.com/go-xorm/builder"
"github.com/go-xorm/core"
)
const (
tpStruct = iota
tpNonStruct
)
// Find retrieve records from table, condiBeans's non-empty fields
// are conditions. beans could be []Struct, []*Struct, map[int64]Struct
// map[int64]*Struct
func (session *Session) Find(rowsSlicePtr interface{}, condiBean ...interface{}) error {
defer session.resetStatement()
if session.IsAutoClose {
defer session.Close()
}
sliceValue := reflect.Indirect(reflect.ValueOf(rowsSlicePtr))
if sliceValue.Kind() != reflect.Slice && sliceValue.Kind() != reflect.Map {
return errors.New("needs a pointer to a slice or a map")
}
sliceElementType := sliceValue.Type().Elem()
var tp = tpStruct
if session.Statement.RefTable == nil {
if sliceElementType.Kind() == reflect.Ptr {
if sliceElementType.Elem().Kind() == reflect.Struct {
pv := reflect.New(sliceElementType.Elem())
session.Statement.setRefValue(pv.Elem())
} else {
//return errors.New("slice type")
tp = tpNonStruct
}
} else if sliceElementType.Kind() == reflect.Struct {
pv := reflect.New(sliceElementType)
session.Statement.setRefValue(pv.Elem())
} else {
//return errors.New("slice type")
tp = tpNonStruct
}
}
var table = session.Statement.RefTable
var addedTableName = (len(session.Statement.JoinStr) > 0)
var autoCond builder.Cond
if tp == tpStruct {
if !session.Statement.noAutoCondition && len(condiBean) > 0 {
var err error
autoCond, err = session.Statement.buildConds(table, condiBean[0], true, true, false, true, addedTableName)
if err != nil {
panic(err)
}
} else {
// !oinume! Add "<col> IS NULL" to WHERE whatever condiBean is given.
// See https://github.com/go-xorm/xorm/issues/179
if col := table.DeletedColumn(); col != nil && !session.Statement.unscoped { // tag "deleted" is enabled
var colName = session.Engine.Quote(col.Name)
if addedTableName {
var nm = session.Statement.TableName()
if len(session.Statement.TableAlias) > 0 {
nm = session.Statement.TableAlias
}
colName = session.Engine.Quote(nm) + "." + colName
}
if session.Engine.dialect.DBType() == core.MSSQL {
autoCond = builder.IsNull{colName}
} else {
autoCond = builder.IsNull{colName}.Or(builder.Eq{colName: "0001-01-01 00:00:00"})
}
}
}
}
var sqlStr string
var args []interface{}
if session.Statement.RawSQL == "" {
if len(session.Statement.TableName()) <= 0 {
return ErrTableNotFound
}
var columnStr = session.Statement.ColumnStr
if len(session.Statement.selectStr) > 0 {
columnStr = session.Statement.selectStr
} else {
if session.Statement.JoinStr == "" {
if columnStr == "" {
if session.Statement.GroupByStr != "" {
columnStr = session.Statement.Engine.Quote(strings.Replace(session.Statement.GroupByStr, ",", session.Engine.Quote(","), -1))
} else {
columnStr = session.Statement.genColumnStr()
}
}
} else {
if columnStr == "" {
if session.Statement.GroupByStr != "" {
columnStr = session.Statement.Engine.Quote(strings.Replace(session.Statement.GroupByStr, ",", session.Engine.Quote(","), -1))
} else {
columnStr = "*"
}
}
}
if columnStr == "" {
columnStr = "*"
}
}
condSQL, condArgs, _ := builder.ToSQL(session.Statement.cond.And(autoCond))
args = append(session.Statement.joinArgs, condArgs...)
sqlStr = session.Statement.genSelectSQL(columnStr, condSQL)
// for mssql and use limit
qs := strings.Count(sqlStr, "?")
if len(args)*2 == qs {
args = append(args, args...)
}
} else {
sqlStr = session.Statement.RawSQL
args = session.Statement.RawParams
}
var err error
if session.canCache() {
if cacher := session.Engine.getCacher2(table); cacher != nil &&
!session.Statement.IsDistinct &&
!session.Statement.unscoped {
err = session.cacheFind(sliceElementType, sqlStr, rowsSlicePtr, args...)
if err != ErrCacheFailed {
return err
}
err = nil // !nashtsai! reset err to nil for ErrCacheFailed
session.Engine.logger.Warn("Cache Find Failed")
}
}
if sliceValue.Kind() != reflect.Map {
return session.noCacheFind(sliceValue, sqlStr, args...)
}
resultsSlice, err := session.query(sqlStr, args...)
if err != nil {
return err
}
keyType := sliceValue.Type().Key()
for _, results := range resultsSlice {
var newValue reflect.Value
if sliceElementType.Kind() == reflect.Ptr {
newValue = reflect.New(sliceElementType.Elem())
} else {
newValue = reflect.New(sliceElementType)
}
err := session.scanMapIntoStruct(newValue.Interface(), results)
if err != nil {
return err
}
var key interface{}
// if there is only one pk, we can put the id as map key.
if len(table.PrimaryKeys) == 1 {
key, err = str2PK(string(results[table.PrimaryKeys[0]]), keyType)
if err != nil {
return err
}
} else {
if keyType.Kind() != reflect.Slice {
panic("don't support multiple primary key's map has non-slice key type")
} else {
var keys core.PK = make([]interface{}, 0, len(table.PrimaryKeys))
for _, pk := range table.PrimaryKeys {
skey, err := str2PK(string(results[pk]), keyType)
if err != nil {
return err
}
keys = append(keys, skey)
}
key = keys
}
}
if sliceElementType.Kind() == reflect.Ptr {
sliceValue.SetMapIndex(reflect.ValueOf(key), reflect.ValueOf(newValue.Interface()))
} else {
sliceValue.SetMapIndex(reflect.ValueOf(key), reflect.Indirect(reflect.ValueOf(newValue.Interface())))
}
}
return nil
}
func (session *Session) noCacheFind(sliceValue reflect.Value, sqlStr string, args ...interface{}) error {
var rawRows *core.Rows
var err error
session.queryPreprocess(&sqlStr, args...)
if session.IsAutoCommit {
_, rawRows, err = session.innerQuery(sqlStr, args...)
} else {
rawRows, err = session.Tx.Query(sqlStr, args...)
}
if err != nil {
return err
}
defer rawRows.Close()
fields, err := rawRows.Columns()
if err != nil {
return err
}
var newElemFunc func() reflect.Value
sliceElementType := sliceValue.Type().Elem()
if sliceElementType.Kind() == reflect.Ptr {
newElemFunc = func() reflect.Value {
return reflect.New(sliceElementType.Elem())
}
} else {
newElemFunc = func() reflect.Value {
return reflect.New(sliceElementType)
}
}
var sliceValueSetFunc func(*reflect.Value)
if sliceValue.Kind() == reflect.Slice {
if sliceElementType.Kind() == reflect.Ptr {
sliceValueSetFunc = func(newValue *reflect.Value) {
sliceValue.Set(reflect.Append(sliceValue, reflect.ValueOf(newValue.Interface())))
}
} else {
sliceValueSetFunc = func(newValue *reflect.Value) {
sliceValue.Set(reflect.Append(sliceValue, reflect.Indirect(reflect.ValueOf(newValue.Interface()))))
}
}
}
var newValue = newElemFunc()
dataStruct := rValue(newValue.Interface())
if dataStruct.Kind() == reflect.Struct {
return session.rows2Beans(rawRows, fields, len(fields), session.Engine.autoMapType(dataStruct), newElemFunc, sliceValueSetFunc)
}
for rawRows.Next() {
var newValue = newElemFunc()
bean := newValue.Interface()
if err := rawRows.Scan(bean); err != nil {
return err
}
sliceValueSetFunc(&newValue)
}
return nil
}
func (session *Session) cacheFind(t reflect.Type, sqlStr string, rowsSlicePtr interface{}, args ...interface{}) (err error) {
if !session.canCache() ||
indexNoCase(sqlStr, "having") != -1 ||
indexNoCase(sqlStr, "group by") != -1 {
return ErrCacheFailed
}
for _, filter := range session.Engine.dialect.Filters() {
sqlStr = filter.Do(sqlStr, session.Engine.dialect, session.Statement.RefTable)
}
newsql := session.Statement.convertIDSQL(sqlStr)
if newsql == "" {
return ErrCacheFailed
}
tableName := session.Statement.TableName()
table := session.Statement.RefTable
cacher := session.Engine.getCacher2(table)
ids, err := core.GetCacheSql(cacher, tableName, newsql, args)
if err != nil {
rows, err := session.DB().Query(newsql, args...)
if err != nil {
return err
}
defer rows.Close()
var i int
ids = make([]core.PK, 0)
for rows.Next() {
i++
if i > 500 {
session.Engine.logger.Debug("[cacheFind] ids length > 500, no cache")
return ErrCacheFailed
}
var res = make([]string, len(table.PrimaryKeys))
err = rows.ScanSlice(&res)
if err != nil {
return err
}
var pk core.PK = make([]interface{}, len(table.PrimaryKeys))
for i, col := range table.PKColumns() {
if col.SQLType.IsNumeric() {
n, err := strconv.ParseInt(res[i], 10, 64)
if err != nil {
return err
}
pk[i] = n
} else if col.SQLType.IsText() {
pk[i] = res[i]
} else {
return errors.New("not supported")
}
}
ids = append(ids, pk)
}
session.Engine.logger.Debug("[cacheFind] cache sql:", ids, tableName, newsql, args)
err = core.PutCacheSql(cacher, ids, tableName, newsql, args)
if err != nil {
return err
}
} else {
session.Engine.logger.Debug("[cacheFind] cache hit sql:", newsql, args)
}
sliceValue := reflect.Indirect(reflect.ValueOf(rowsSlicePtr))
ididxes := make(map[string]int)
var ides []core.PK
var temps = make([]interface{}, len(ids))
for idx, id := range ids {
sid, err := id.ToString()
if err != nil {
return err
}
bean := cacher.GetBean(tableName, sid)
if bean == nil {
ides = append(ides, id)
ididxes[sid] = idx
} else {
session.Engine.logger.Debug("[cacheFind] cache hit bean:", tableName, id, bean)
pk := session.Engine.IdOf(bean)
xid, err := pk.ToString()
if err != nil {
return err
}
if sid != xid {
session.Engine.logger.Error("[cacheFind] error cache", xid, sid, bean)
return ErrCacheFailed
}
temps[idx] = bean
}
}
if len(ides) > 0 {
newSession := session.Engine.NewSession()
defer newSession.Close()
slices := reflect.New(reflect.SliceOf(t))
beans := slices.Interface()
if len(table.PrimaryKeys) == 1 {
ff := make([]interface{}, 0, len(ides))
for _, ie := range ides {
ff = append(ff, ie[0])
}
newSession.In("`"+table.PrimaryKeys[0]+"`", ff...)
} else {
for _, ie := range ides {
cond := builder.NewCond()
for i, name := range table.PrimaryKeys {
cond = cond.And(builder.Eq{"`" + name + "`": ie[i]})
}
newSession.Or(cond)
}
}
err = newSession.NoCache().Find(beans)
if err != nil {
return err
}
vs := reflect.Indirect(reflect.ValueOf(beans))
for i := 0; i < vs.Len(); i++ {
rv := vs.Index(i)
if rv.Kind() != reflect.Ptr {
rv = rv.Addr()
}
id := session.Engine.IdOfV(rv)
sid, err := id.ToString()
if err != nil {
return err
}
bean := rv.Interface()
temps[ididxes[sid]] = bean
session.Engine.logger.Debug("[cacheFind] cache bean:", tableName, id, bean, temps)
cacher.PutBean(tableName, sid, bean)
}
}
for j := 0; j < len(temps); j++ {
bean := temps[j]
if bean == nil {
session.Engine.logger.Warn("[cacheFind] cache no hit:", tableName, ids[j], temps)
// return errors.New("cache error") // !nashtsai! no need to return error, but continue instead
continue
}
if sliceValue.Kind() == reflect.Slice {
if t.Kind() == reflect.Ptr {
sliceValue.Set(reflect.Append(sliceValue, reflect.ValueOf(bean)))
} else {
sliceValue.Set(reflect.Append(sliceValue, reflect.Indirect(reflect.ValueOf(bean))))
}
} else if sliceValue.Kind() == reflect.Map {
var key = ids[j]
keyType := sliceValue.Type().Key()
var ikey interface{}
if len(key) == 1 {
ikey, err = str2PK(fmt.Sprintf("%v", key[0]), keyType)
if err != nil {
return err
}
} else {
if keyType.Kind() != reflect.Slice {
return errors.New("table have multiple primary keys, key is not core.PK or slice")
}
ikey = key
}
if t.Kind() == reflect.Ptr {
sliceValue.SetMapIndex(reflect.ValueOf(ikey), reflect.ValueOf(bean))
} else {
sliceValue.SetMapIndex(reflect.ValueOf(ikey), reflect.Indirect(reflect.ValueOf(bean)))
}
}
}
return nil
}