Cml\Interfaces\Db::sum PHP Метод

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sum() публичный Метод

获取 SUM(字段名或*) 的结果
public sum ( string $field = '*', boolean | string $isMulti = false, boolean | string $useMaster = false ) : mixed
$field string 要统计的字段名
$isMulti boolean | string 结果集是否为多条 默认只有一条。传字符串时相当于执行了 groupBy($isMulti)
$useMaster boolean | string 是否使用主库 默认读取从库
Результат mixed 
    public function sum($field = '*', $isMulti = false, $useMaster = false);
Db
__construct
__destruct
_and
_or
affectedRows
avg
buildSql
callProcedure
chunk
columns
commit
conditionFactory
connect
count
decrement
delete
get
getAllTableStatus
getDbFields
getOne
getOneValue
getPk
getTables
groupBy
having
increment
insertId
join
lBrackets
leftJoin
limit
max
min
orderBy
paginate
plunk
rBrackets
rightJoin
rollBack
savePoint
select
set
startTransAction
sum
table
truncate
union
update
version
where
whereBetween
whereGt
whereGte
whereIn
whereLike
whereLt
whereLte
whereNot
whereNotBetween
whereNotIn
whereNotLike
whereNotNull
whereNull
whereRegExp