Cml\Interfaces\Db::sum PHP Method

Db Interface Documentation 显示文件 Open project: linhecheng/cmlphp

sum() public method

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)
$useMaster boolean | string 是否使用主库 默认读取从库
return mixed 
    public function sum($field = '*', $isMulti = false, $useMaster = false);
Db
__construct
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affectedRows
avg
buildSql
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chunk
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get
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