151 lines
3.5 KiB
Go
151 lines
3.5 KiB
Go
// Copyright 2015 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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"xorm.io/builder"
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"xorm.io/xorm/core"
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)
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// Rows rows wrapper a rows to
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type Rows struct {
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session *Session
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rows *core.Rows
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beanType reflect.Type
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}
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func newRows(session *Session, bean interface{}) (*Rows, error) {
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rows := new(Rows)
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rows.session = session
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rows.beanType = reflect.Indirect(reflect.ValueOf(bean)).Type()
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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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beanValue := reflect.ValueOf(bean)
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if beanValue.Kind() != reflect.Ptr {
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return nil, errors.New("needs a pointer to a value")
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} else if beanValue.Elem().Kind() == reflect.Ptr {
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return nil, errors.New("a pointer to a pointer is not allowed")
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}
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if err = rows.session.statement.SetRefBean(bean); err != nil {
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return nil, err
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}
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if len(session.statement.TableName()) == 0 {
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return nil, ErrTableNotFound
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}
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if rows.session.statement.RawSQL == "" {
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var autoCond builder.Cond
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var addedTableName = (len(session.statement.JoinStr) > 0)
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var table = rows.session.statement.RefTable
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if !session.statement.NoAutoCondition {
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var err error
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autoCond, err = session.statement.BuildConds(table, bean, true, true, false, true, addedTableName)
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if err != nil {
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return nil, 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://gitea.com/xorm/xorm/issues/179
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if col := table.DeletedColumn(); col != nil && !session.statement.GetUnscoped() { // tag "deleted" is enabled
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autoCond = session.statement.CondDeleted(col)
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}
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}
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sqlStr, args, err = rows.session.statement.GenFindSQL(autoCond)
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if err != nil {
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return nil, err
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}
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} else {
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sqlStr = rows.session.statement.GenRawSQL()
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args = rows.session.statement.RawParams
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}
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rows.rows, err = rows.session.queryRows(sqlStr, args...)
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if err != nil {
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rows.Close()
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return nil, err
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}
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return rows, nil
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}
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// Next move cursor to next record, return false if end has reached
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func (rows *Rows) Next() bool {
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if rows.rows != nil {
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return rows.rows.Next()
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}
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return false
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}
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// Err returns the error, if any, that was encountered during iteration. Err may be called after an explicit or implicit Close.
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func (rows *Rows) Err() error {
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if rows.rows != nil {
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return rows.rows.Err()
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}
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return nil
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}
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// Scan row record to bean properties
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func (rows *Rows) Scan(beans ...interface{}) error {
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if rows.Err() != nil {
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return rows.Err()
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}
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var bean = beans[0]
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var tp = reflect.TypeOf(bean)
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if tp.Kind() == reflect.Ptr {
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tp = tp.Elem()
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}
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var beanKind = tp.Kind()
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if len(beans) == 1 {
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if reflect.Indirect(reflect.ValueOf(bean)).Type() != rows.beanType {
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return fmt.Errorf("scan arg is incompatible type to [%v]", rows.beanType)
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}
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if err := rows.session.statement.SetRefBean(bean); err != nil {
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return err
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}
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}
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fields, err := rows.rows.Columns()
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if err != nil {
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return err
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}
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types, err := rows.rows.ColumnTypes()
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if err != nil {
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return err
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}
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if err := rows.session.scan(rows.rows, rows.session.statement.RefTable, beanKind, beans, types, fields); err != nil {
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return err
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}
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return rows.session.executeProcessors()
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}
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// Close session if session.IsAutoClose is true, and claimed any opened resources
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func (rows *Rows) Close() error {
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if rows.session.isAutoClose {
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defer rows.session.Close()
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}
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if rows.rows != nil {
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return rows.rows.Close()
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}
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return nil
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}
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