来自 sbcl 的 cl-dbi 查询 mysql 有错误 - 非法：从位置 18 开始的 UTF-8 字符

Question

今天尝试使用 cl-dbi 并对 mysql 进行一些查询。但失败并出现以下错误：

debugger invoked on a BABEL-ENCODINGS:INVALID-UTF8-STARTER-BYTE in thread
#<THREAD "main thread" RUNNING {B3E2151}>:   Illegal :UTF-8 character starting at position 18.

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):   0: [ABORT] Exit debugger, returning to top level.

((LABELS BABEL-ENCODINGS::UTF-8-DECODER :IN "/home/angelo/quicklisp/dists/quicklisp/software/cffi_0.14.0/src/strings.lisp")
#<unavailable lambda list>)

这里是mysql字符集：

mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | latin1                     |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

mysql> SHOW VARIABLES LIKE 'collation%';
+----------------------+-------------------+
| Variable_name        | Value             |
+----------------------+-------------------+
| collation_connection | utf8_general_ci   |
| collation_database   | latin1_swedish_ci |
| collation_server     | latin1_swedish_ci |
+----------------------+-------------------+
3 rows in set (0.00 sec)

这里有更多测试：
1. 我尝试根据 post 的建议将整个数据库转换为 utf-8，但仍然失败并出现相同的错误。

8/3/2015：这里我尝试在当前 cl-dbi 连接中查询 character_set 和排序规则。结果如下：

**Query:**
(setf query (dbi:prepare *connection*
             "SHOW VARIABLES LIKE 'character_set%';"))
(setf result (dbi:execute query))
(loop for row = (dbi:fetch result)
       while row
   do (format t "~A~%" row))
**Result:**
(Variable_name character_set_client Value latin1)
(Variable_name character_set_connection Value latin1)
(Variable_name character_set_database Value utf8)
(Variable_name character_set_filesystem Value binary)
(Variable_name character_set_results Value latin1)
(Variable_name character_set_server Value latin1)
(Variable_name character_set_system Value utf8)
(Variable_name character_sets_dir Value /usr/share/mysql/charsets/)
NIL

**Query:**
(setf query (dbi:prepare *connection*
             "SHOW VARIABLES LIKE 'collation%';"))
(setf result (dbi:execute query))
(loop for row = (dbi:fetch result)
       while row
   do (format t "~A~%" row))

**Result:**
(Variable_name collation_connection Value latin1_swedish_ci)
(Variable_name collation_database Value utf8_unicode_ci)
(Variable_name collation_server Value latin1_swedish_ci)
NIL

按照"Fernando Borretti"的建议，发送"SET names 'utf8';"后，查询成功完成，问题已解决。以下是测试结果供参考：

**Sending:**
(setf query (dbi:prepare *connection* "SET names 'utf8';"))

(setf result (dbi:execute query))
(loop for row = (dbi:fetch result)
       while row
   do (format t "~A~%" row))

**Query:**
(setf query (dbi:prepare *connection*
             "SHOW VARIABLES LIKE 'character_set%';"))
(setf result (dbi:execute query))
(loop for row = (dbi:fetch result)
       while row
   do (format t "~A~%" row))
**Result:**
(Variable_name character_set_client Value utf8)
(Variable_name character_set_connection Value utf8)
(Variable_name character_set_database Value utf8)
(Variable_name character_set_filesystem Value binary)
(Variable_name character_set_results Value utf8)
(Variable_name character_set_server Value latin1)
(Variable_name character_set_system Value utf8)
(Variable_name character_sets_dir Value /usr/share/mysql/charsets/)
NIL
**Query:**
(setf query (dbi:prepare *connection*
             "SHOW VARIABLES LIKE 'collation%';"))
(setf result (dbi:execute query))
(loop for row = (dbi:fetch result)
       while row
   do (format t "~A~%" row))
**Result:**
(Variable_name collation_connection Value utf8_general_ci)
(Variable_name collation_database Value utf8_unicode_ci)
(Variable_name collation_server Value latin1_swedish_ci)
NIL

Answer 1

发送SET NAMES utf8有帮助吗？我从对 this 评论的回复中得到了灵感。

来自 sbcl 的 cl-dbi 查询 mysql 有错误 - 非法：从位置 18 开始的 UTF-8 字符

cl-dbi query mysql from sbcl with error - Illegal :UTF-8 character starting at position 18

mysql

lisp

common-lisp

clsql