Simple and Powerful ORM for Go, support mysql,postgres,tidb,sqlite3,mssql,oracle https://xorm.io
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 

358 lines
8.5 KiB

// 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 (
"database/sql"
"errors"
"fmt"
"reflect"
"strconv"
"xorm.io/xorm/caches"
"xorm.io/xorm/internal/utils"
"xorm.io/xorm/schemas"
)
// Get retrieve one record from database, bean's non-empty fields
// will be as conditions
func (session *Session) Get(bean interface{}) (bool, error) {
if session.isAutoClose {
defer session.Close()
}
return session.get(bean)
}
func (session *Session) get(bean interface{}) (bool, error) {
defer session.resetStatement()
if session.statement.LastError != nil {
return false, session.statement.LastError
}
beanValue := reflect.ValueOf(bean)
if beanValue.Kind() != reflect.Ptr {
return false, errors.New("needs a pointer to a value")
} else if beanValue.Elem().Kind() == reflect.Ptr {
return false, errors.New("a pointer to a pointer is not allowed")
}
if beanValue.Elem().Kind() == reflect.Struct {
if err := session.statement.SetRefBean(bean); err != nil {
return false, err
}
}
var sqlStr string
var args []interface{}
var err error
if session.statement.RawSQL == "" {
if len(session.statement.TableName()) <= 0 {
return false, ErrTableNotFound
}
session.statement.Limit(1)
sqlStr, args, err = session.statement.GenGetSQL(bean)
if err != nil {
return false, err
}
} else {
sqlStr = session.statement.GenRawSQL()
args = session.statement.RawParams
}
table := session.statement.RefTable
if session.statement.ColumnMap.IsEmpty() && session.canCache() && beanValue.Elem().Kind() == reflect.Struct {
if cacher := session.engine.GetCacher(session.statement.TableName()); cacher != nil &&
!session.statement.GetUnscoped() {
has, err := session.cacheGet(bean, sqlStr, args...)
if err != ErrCacheFailed {
return has, err
}
}
}
context := session.statement.Context
if context != nil {
res := context.Get(fmt.Sprintf("%v-%v", sqlStr, args))
if res != nil {
session.engine.logger.Debugf("hit context cache: %s", sqlStr)
structValue := reflect.Indirect(reflect.ValueOf(bean))
structValue.Set(reflect.Indirect(reflect.ValueOf(res)))
session.lastSQL = ""
session.lastSQLArgs = nil
return true, nil
}
}
has, err := session.nocacheGet(beanValue.Elem().Kind(), table, bean, sqlStr, args...)
if err != nil || !has {
return has, err
}
if context != nil {
context.Put(fmt.Sprintf("%v-%v", sqlStr, args), bean)
}
return true, nil
}
func (session *Session) nocacheGet(beanKind reflect.Kind, table *schemas.Table, bean interface{}, sqlStr string, args ...interface{}) (bool, error) {
rows, err := session.queryRows(sqlStr, args...)
if err != nil {
return false, err
}
defer rows.Close()
if !rows.Next() {
if rows.Err() != nil {
return false, rows.Err()
}
return false, nil
}
switch bean.(type) {
case sql.NullInt64, sql.NullBool, sql.NullFloat64, sql.NullString:
return true, rows.Scan(&bean)
case *sql.NullInt64, *sql.NullBool, *sql.NullFloat64, *sql.NullString:
return true, rows.Scan(bean)
case *string:
var res sql.NullString
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*string)) = res.String
}
return true, nil
case *int:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*int)) = int(res.Int64)
}
return true, nil
case *int8:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*int8)) = int8(res.Int64)
}
return true, nil
case *int16:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*int16)) = int16(res.Int64)
}
return true, nil
case *int32:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*int32)) = int32(res.Int64)
}
return true, nil
case *int64:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*int64)) = int64(res.Int64)
}
return true, nil
case *uint:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*uint)) = uint(res.Int64)
}
return true, nil
case *uint8:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*uint8)) = uint8(res.Int64)
}
return true, nil
case *uint16:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*uint16)) = uint16(res.Int64)
}
return true, nil
case *uint32:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*uint32)) = uint32(res.Int64)
}
return true, nil
case *uint64:
var res sql.NullInt64
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*uint64)) = uint64(res.Int64)
}
return true, nil
case *bool:
var res sql.NullBool
if err := rows.Scan(&res); err != nil {
return true, err
}
if res.Valid {
*(bean.(*bool)) = res.Bool
}
return true, nil
}
switch beanKind {
case reflect.Struct:
fields, err := rows.Columns()
if err != nil {
// WARN: Alougth rows return true, but get fields failed
return true, err
}
scanResults, err := session.row2Slice(rows, fields, bean)
if err != nil {
return false, err
}
// close it before convert data
rows.Close()
dataStruct := utils.ReflectValue(bean)
_, err = session.slice2Bean(scanResults, fields, bean, &dataStruct, table)
if err != nil {
return true, err
}
return true, session.executeProcessors()
case reflect.Slice:
err = rows.ScanSlice(bean)
case reflect.Map:
err = rows.ScanMap(bean)
case reflect.String, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
err = rows.Scan(bean)
default:
err = rows.Scan(bean)
}
return true, err
}
func (session *Session) cacheGet(bean interface{}, sqlStr string, args ...interface{}) (has bool, err error) {
// if has no reftable, then don't use cache currently
if !session.canCache() {
return false, ErrCacheFailed
}
for _, filter := range session.engine.dialect.Filters() {
sqlStr = filter.Do(sqlStr)
}
newsql := session.statement.ConvertIDSQL(sqlStr)
if newsql == "" {
return false, ErrCacheFailed
}
tableName := session.statement.TableName()
cacher := session.engine.cacherMgr.GetCacher(tableName)
session.engine.logger.Debugf("[cache] Get SQL: %s, %v", newsql, args)
table := session.statement.RefTable
ids, err := caches.GetCacheSql(cacher, tableName, newsql, args)
if err != nil {
var res = make([]string, len(table.PrimaryKeys))
rows, err := session.NoCache().queryRows(newsql, args...)
if err != nil {
return false, err
}
defer rows.Close()
if rows.Next() {
err = rows.ScanSlice(&res)
if err != nil {
return false, err
}
} else {
return false, ErrCacheFailed
}
var pk schemas.PK = make([]interface{}, len(table.PrimaryKeys))
for i, col := range table.PKColumns() {
if col.SQLType.IsText() {
pk[i] = res[i]
} else if col.SQLType.IsNumeric() {
n, err := strconv.ParseInt(res[i], 10, 64)
if err != nil {
return false, err
}
pk[i] = n
} else {
return false, errors.New("unsupported")
}
}
ids = []schemas.PK{pk}
session.engine.logger.Debugf("[cache] cache ids: %s, %v", newsql, ids)
err = caches.PutCacheSql(cacher, ids, tableName, newsql, args)
if err != nil {
return false, err
}
} else {
session.engine.logger.Debugf("[cache] cache hit: %s, %v", newsql, ids)
}
if len(ids) > 0 {
structValue := reflect.Indirect(reflect.ValueOf(bean))
id := ids[0]
session.engine.logger.Debugf("[cache] get bean: %s, %v", tableName, id)
sid, err := id.ToString()
if err != nil {
return false, err
}
cacheBean := cacher.GetBean(tableName, sid)
if cacheBean == nil {
cacheBean = bean
has, err = session.nocacheGet(reflect.Struct, table, cacheBean, sqlStr, args...)
if err != nil || !has {
return has, err
}
session.engine.logger.Debugf("[cache] cache bean: %s, %v, %v", tableName, id, cacheBean)
cacher.PutBean(tableName, sid, cacheBean)
} else {
session.engine.logger.Debugf("[cache] cache hit: %s, %v, %v", tableName, id, cacheBean)
has = true
}
structValue.Set(reflect.Indirect(reflect.ValueOf(cacheBean)))
return has, nil
}
return false, nil
}