82 lines
2.3 KiB
Go
82 lines
2.3 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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"errors"
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"reflect"
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)
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// Count counts the records. bean's non-empty fields
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// are conditions.
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func (session *Session) Count(bean ...interface{}) (int64, error) {
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if session.isAutoClose {
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defer session.Close()
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}
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sqlStr, args, err := session.statement.GenCountSQL(bean...)
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if err != nil {
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return 0, err
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}
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var total int64
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err = session.queryRow(sqlStr, args...).Scan(&total)
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if err == sql.ErrNoRows || err == nil {
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return total, nil
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}
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return 0, err
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}
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// sum call sum some column. bean's non-empty fields are conditions.
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func (session *Session) sum(res interface{}, bean interface{}, columnNames ...string) error {
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if session.isAutoClose {
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defer session.Close()
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}
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v := reflect.ValueOf(res)
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if v.Kind() != reflect.Ptr {
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return errors.New("need a pointer to a variable")
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}
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sqlStr, args, err := session.statement.GenSumSQL(bean, columnNames...)
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if err != nil {
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return err
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}
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if v.Elem().Kind() == reflect.Slice {
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err = session.queryRow(sqlStr, args...).ScanSlice(res)
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} else {
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err = session.queryRow(sqlStr, args...).Scan(res)
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}
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if err == sql.ErrNoRows || err == nil {
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return nil
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}
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return err
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}
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// Sum call sum some column. bean's non-empty fields are conditions.
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func (session *Session) Sum(bean interface{}, columnName string) (res float64, err error) {
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return res, session.sum(&res, bean, columnName)
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}
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// SumInt call sum some column. bean's non-empty fields are conditions.
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func (session *Session) SumInt(bean interface{}, columnName string) (res int64, err error) {
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return res, session.sum(&res, bean, columnName)
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}
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// Sums call sum some columns. bean's non-empty fields are conditions.
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func (session *Session) Sums(bean interface{}, columnNames ...string) ([]float64, error) {
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var res = make([]float64, len(columnNames), len(columnNames))
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return res, session.sum(&res, bean, columnNames...)
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}
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// SumsInt sum specify columns and return as []int64 instead of []float64
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func (session *Session) SumsInt(bean interface{}, columnNames ...string) ([]int64, error) {
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var res = make([]int64, len(columnNames), len(columnNames))
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return res, session.sum(&res, bean, columnNames...)
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}
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