guodongxiaren opened a new issue #1305:
URL: https://github.com/apache/incubator-brpc/issues/1305
**Describe the bug (描述bug)**
发现发送MGET的时候，用
```
request->AddCommand("MGET %s", keys.c_str());
```
keys是空格分隔的字符串。包含多个key。
得到了reply总是异常。换成
```
AddCommandByComponents(parts.data(), parts.size());
//parts是vector<butil::StringPiece>的数组
```
可以。解析逻辑相同。
而使用ZRANGE的时候则相反，AddCommandByComponents传入butil::StringPiece凑成`ZRANGE key 0
-1`会得不到结果，
```
int start = 0;
int stop = -1;
...
butil::StringPiece parts[4];
parts[0].set("ZRANGE");
parts[1].set(key.c_str());
parts[2].set(std::to_string(start).c_str());
parts[3].set(std::to_string(stop).c_str());
request->AddCommandByComponents(&parts[0], 4);
```
可以。
而
```
request->AddCommand("ZRANGE %s 0 -1", key.c_str());
```
可以。解析逻辑相同。
**To Reproduce (复现方法)**
**Expected behavior (期望行为)**
**Versions (各种版本)**
OS:
Compiler:
brpc:
protobuf:
**Additional context/screenshots (更多上下文/截图)**
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