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