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211 lines
5.4 KiB
211 lines
5.4 KiB
// 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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"errors"
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"reflect"
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"strconv"
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"github.com/go-xorm/core"
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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 (session *Session) get(bean interface{}) (bool, error) {
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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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}
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if beanValue.Elem().Kind() == reflect.Struct {
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if err := session.statement.setRefValue(beanValue.Elem()); 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.RawSQL
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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.canCache() && beanValue.Elem().Kind() == reflect.Struct {
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if cacher := session.engine.getCacher2(table); cacher != nil &&
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!session.statement.unscoped {
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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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return session.nocacheGet(beanValue.Elem().Kind(), table, bean, sqlStr, args...)
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}
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func (session *Session) nocacheGet(beanKind reflect.Kind, table *core.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, nil
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}
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switch bean.(type) {
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case sql.NullInt64, sql.NullBool, sql.NullFloat64, sql.NullString:
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return true, rows.Scan(&bean)
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case *sql.NullInt64, *sql.NullBool, *sql.NullFloat64, *sql.NullString:
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return true, rows.Scan(bean)
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}
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switch beanKind {
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case reflect.Struct:
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fields, err := rows.Columns()
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if err != nil {
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// WARN: Alougth rows return true, but get fields failed
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return true, err
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}
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scanResults, err := session.row2Slice(rows, fields, 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 covert data
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rows.Close()
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dataStruct := rValue(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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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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return true, err
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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, 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 false, ErrCacheFailed
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}
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cacher := session.engine.getCacher2(session.statement.RefTable)
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tableName := session.statement.TableName()
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session.engine.logger.Debug("[cacheGet] find sql:", newsql, args)
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table := session.statement.RefTable
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ids, err := core.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 false, err
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}
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} else {
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return false, ErrCacheFailed
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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.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 = []core.PK{pk}
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session.engine.logger.Debug("[cacheGet] cache ids:", newsql, ids)
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err = core.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.Debug("[cacheGet] cache hit sql:", 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.Debug("[cacheGet] get bean:", 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.Debug("[cacheGet] cache bean:", tableName, id, cacheBean)
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cacher.PutBean(tableName, sid, cacheBean)
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} else {
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session.engine.logger.Debug("[cacheGet] cache hit bean:", 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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