377 lines
9.6 KiB
Go
377 lines
9.6 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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"database/sql"
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"database/sql/driver"
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"errors"
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"fmt"
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"math/big"
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"reflect"
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"strconv"
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"time"
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"xorm.io/xorm/caches"
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"xorm.io/xorm/convert"
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"xorm.io/xorm/core"
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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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var (
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// ErrObjectIsNil return error of object is nil
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ErrObjectIsNil = errors.New("object should not be nil")
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)
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// Get retrieve one record from database, bean's non-empty fields
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// will be as conditions
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func (session *Session) Get(bean interface{}) (bool, 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.get(bean)
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}
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func isPtrOfTime(v interface{}) bool {
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if _, ok := v.(*time.Time); ok {
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return true
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}
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el := reflect.ValueOf(v).Elem()
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if el.Kind() != reflect.Struct {
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return false
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}
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return el.Type().ConvertibleTo(schemas.TimeType)
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}
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func (session *Session) get(bean interface{}) (bool, error) {
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defer session.resetStatement()
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if session.statement.LastError != nil {
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return false, session.statement.LastError
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}
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beanValue := reflect.ValueOf(bean)
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if beanValue.Kind() != reflect.Ptr {
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return false, errors.New("needs a pointer to a value")
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} else if beanValue.Elem().Kind() == reflect.Ptr {
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return false, errors.New("a pointer to a pointer is not allowed")
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} else if beanValue.IsNil() {
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return false, ErrObjectIsNil
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}
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if beanValue.Elem().Kind() == reflect.Struct && !isPtrOfTime(bean) {
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if err := session.statement.SetRefBean(bean); err != nil {
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return false, err
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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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var err error
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if session.statement.RawSQL == "" {
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if len(session.statement.TableName()) <= 0 {
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return false, ErrTableNotFound
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}
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session.statement.Limit(1)
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sqlStr, args, err = session.statement.GenGetSQL(bean)
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if err != nil {
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return false, err
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}
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} else {
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sqlStr = session.statement.GenRawSQL()
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args = session.statement.RawParams
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}
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table := session.statement.RefTable
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if session.statement.ColumnMap.IsEmpty() && session.canCache() && beanValue.Elem().Kind() == reflect.Struct {
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if cacher := session.engine.GetCacher(session.statement.TableName()); cacher != nil &&
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!session.statement.GetUnscoped() {
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has, err := session.cacheGet(bean, sqlStr, args...)
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if err != ErrCacheFailed {
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return has, err
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}
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}
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}
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context := session.statement.Context
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if context != nil {
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res := context.Get(fmt.Sprintf("%v-%v", sqlStr, args))
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if res != nil {
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session.engine.logger.Debugf("hit context cache: %s", sqlStr)
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structValue := reflect.Indirect(reflect.ValueOf(bean))
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structValue.Set(reflect.Indirect(reflect.ValueOf(res)))
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session.lastSQL = ""
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session.lastSQLArgs = nil
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return true, nil
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}
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}
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has, err := session.nocacheGet(beanValue.Elem().Kind(), table, bean, sqlStr, args...)
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if err != nil || !has {
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return has, err
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}
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if context != nil {
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context.Put(fmt.Sprintf("%v-%v", sqlStr, args), bean)
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}
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return true, nil
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}
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var (
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valuerTypePlaceHolder driver.Valuer
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valuerType = reflect.TypeOf(&valuerTypePlaceHolder).Elem()
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scannerTypePlaceHolder sql.Scanner
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scannerType = reflect.TypeOf(&scannerTypePlaceHolder).Elem()
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conversionTypePlaceHolder convert.Conversion
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conversionType = reflect.TypeOf(&conversionTypePlaceHolder).Elem()
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)
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func isScannableStruct(bean interface{}, typeLen int) bool {
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switch bean.(type) {
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case *time.Time:
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return false
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case sql.Scanner:
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return false
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case convert.Conversion:
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return typeLen > 1
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case *big.Float:
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return false
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}
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return true
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}
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func (session *Session) nocacheGet(beanKind reflect.Kind, table *schemas.Table, bean interface{}, sqlStr string, args ...interface{}) (bool, error) {
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rows, err := session.queryRows(sqlStr, args...)
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if err != nil {
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return false, err
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}
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defer rows.Close()
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if !rows.Next() {
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return false, rows.Err()
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}
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// WARN: Alougth rows return true, but we may also return error.
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types, err := rows.ColumnTypes()
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if err != nil {
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return true, err
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}
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fields, err := rows.Columns()
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if err != nil {
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return true, err
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}
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switch beanKind {
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case reflect.Struct:
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if !isScannableStruct(bean, len(types)) {
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break
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}
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return session.getStruct(rows, types, fields, table, bean)
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case reflect.Slice:
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return session.getSlice(rows, types, fields, bean)
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case reflect.Map:
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return session.getMap(rows, types, fields, bean)
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}
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return session.getVars(rows, types, fields, bean)
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}
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func (session *Session) getSlice(rows *core.Rows, types []*sql.ColumnType, fields []string, bean interface{}) (bool, error) {
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switch t := bean.(type) {
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case *[]string:
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res, err := session.engine.scanStringInterface(rows, fields, types)
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if err != nil {
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return true, err
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}
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var needAppend = len(*t) == 0 // both support slice is empty or has been initlized
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for i, r := range res {
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if needAppend {
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*t = append(*t, r.(*sql.NullString).String)
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} else {
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(*t)[i] = r.(*sql.NullString).String
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}
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}
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return true, nil
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case *[]interface{}:
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scanResults, err := session.engine.scanInterfaces(rows, fields, types)
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if err != nil {
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return true, err
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}
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var needAppend = len(*t) == 0
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for ii := range fields {
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s, err := convert.Interface2Interface(session.engine.DatabaseTZ, scanResults[ii])
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if err != nil {
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return true, err
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}
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if needAppend {
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*t = append(*t, s)
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} else {
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(*t)[ii] = s
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}
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}
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return true, nil
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default:
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return true, fmt.Errorf("unspoorted slice type: %t", t)
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}
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}
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func (session *Session) getMap(rows *core.Rows, types []*sql.ColumnType, fields []string, bean interface{}) (bool, error) {
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switch t := bean.(type) {
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case *map[string]string:
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scanResults, err := session.engine.scanStringInterface(rows, fields, types)
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if err != nil {
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return true, err
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}
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for ii, key := range fields {
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(*t)[key] = scanResults[ii].(*sql.NullString).String
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}
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return true, nil
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case *map[string]interface{}:
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scanResults, err := session.engine.scanInterfaces(rows, fields, types)
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if err != nil {
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return true, err
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}
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for ii, key := range fields {
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s, err := convert.Interface2Interface(session.engine.DatabaseTZ, scanResults[ii])
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if err != nil {
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return true, err
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}
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(*t)[key] = s
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}
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return true, nil
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default:
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return true, fmt.Errorf("unspoorted map type: %t", t)
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}
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}
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func (session *Session) getVars(rows *core.Rows, types []*sql.ColumnType, fields []string, beans ...interface{}) (bool, error) {
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if len(beans) != len(types) {
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return false, fmt.Errorf("expected columns %d, but only %d variables", len(types), len(beans))
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}
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err := session.engine.scan(rows, fields, types, beans...)
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return true, err
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}
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func (session *Session) getStruct(rows *core.Rows, types []*sql.ColumnType, fields []string, table *schemas.Table, bean interface{}) (bool, error) {
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scanResults, err := session.row2Slice(rows, fields, types, bean)
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if err != nil {
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return false, err
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}
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// close it before convert data
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rows.Close()
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dataStruct := utils.ReflectValue(bean)
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_, err = session.slice2Bean(scanResults, fields, bean, &dataStruct, table)
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if err != nil {
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return true, err
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}
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return true, session.executeProcessors()
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}
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func (session *Session) cacheGet(bean interface{}, sqlStr string, args ...interface{}) (has bool, err error) {
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// if has no reftable, then don't use cache currently
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if !session.canCache() {
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return false, ErrCacheFailed
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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 false, 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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session.engine.logger.Debugf("[cache] Get SQL: %s, %v", newsql, args)
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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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var res = make([]string, len(table.PrimaryKeys))
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rows, err := session.NoCache().queryRows(newsql, args...)
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if err != nil {
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return false, err
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}
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defer rows.Close()
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if rows.Next() {
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err = rows.ScanSlice(&res)
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if err != nil {
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return true, err
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}
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} else {
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if rows.Err() != nil {
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return false, rows.Err()
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}
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return false, ErrCacheFailed
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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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if col.SQLType.IsText() {
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pk[i] = res[i]
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} else 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 false, err
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}
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pk[i] = n
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} else {
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return false, errors.New("unsupported")
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}
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}
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ids = []schemas.PK{pk}
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session.engine.logger.Debugf("[cache] cache ids: %s, %v", newsql, ids)
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err = caches.PutCacheSql(cacher, ids, tableName, newsql, args)
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if err != nil {
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return false, err
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}
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} else {
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session.engine.logger.Debugf("[cache] cache hit: %s, %v", newsql, ids)
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}
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if len(ids) > 0 {
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structValue := reflect.Indirect(reflect.ValueOf(bean))
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id := ids[0]
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session.engine.logger.Debugf("[cache] get bean: %s, %v", tableName, id)
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sid, err := id.ToString()
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if err != nil {
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return false, err
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}
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cacheBean := cacher.GetBean(tableName, sid)
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if cacheBean == nil {
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cacheBean = bean
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has, err = session.nocacheGet(reflect.Struct, table, cacheBean, sqlStr, args...)
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if err != nil || !has {
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return has, err
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}
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session.engine.logger.Debugf("[cache] cache bean: %s, %v, %v", tableName, id, cacheBean)
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cacher.PutBean(tableName, sid, cacheBean)
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} else {
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session.engine.logger.Debugf("[cache] cache hit: %s, %v, %v", tableName, id, cacheBean)
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has = true
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}
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structValue.Set(reflect.Indirect(reflect.ValueOf(cacheBean)))
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return has, nil
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}
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return false, nil
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}
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