# `Stuff` (function)

> 使用字符串替换从指定位置开始指定长度的字符，返回新字符串


- **Type:** FUNCTION
- **Returns:** `varchar(8000)`
- **Deterministic:** NO
- **SQL data access:** CONTAINS SQL

## Parameters

| # | Mode | Name | Type |
|---|---|---|---|
| 1 | IN | `str` | `varchar(8000)` |
| 2 | IN | `startIndex` | `int` |
| 3 | IN | `length` | `int` |
| 4 | IN | `Newstr` | `varchar(8000)` |

## Body

_Body is not pre-cached. To inspect: `mysql --defaults-file=~/.my.cnf -e 'SHOW CREATE FUNCTION `Stuff`'`._

## Narrative

_No human-written narrative yet._