Hive导出到Mysql中中文乱码的问题 在上一篇文章《 从hive将数据导出到mysql 》中，虽然通过hive中转，将hbase的数据成功导出到了mysql中，但是我们遇到了中文乱码问题。 一、mysql中的编码 mysql show variables like 'collation_%';+----------------------+
Hive导出到Mysql中中文乱码的问题在上一篇文章《从hive将数据导出到mysql》中，虽然通过hive中转，将hbase的数据成功导出到了mysql中，但是我们遇到了中文乱码问题。
mysql> show variables like 'collation_%'; +----------------------+-------------------+ | Variable_name | Value | +----------------------+-------------------+ | collation_connection | latin1_swedish_ci | | collation_database | latin1_swedish_ci | | collation_server | latin1_swedish_ci | +----------------------+-------------------+ 3 rows in set (0.00 sec) mysql> show variables like 'character_set_%'; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | latin1 | | character_set_connection | latin1 | | character_set_database | latin1 | | character_set_filesystem | binary | | character_set_results | latin1 | | character_set_server | latin1 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+ 8 rows in set (0.00 sec)
?可见原来缺省是latin1编码，会导致中文乱码。
可以在mysql中设置编码，单个设置
mysql> alter database name character set utf8;
mysql> set character_set_connection=utf8;
Query OK, 0 rows affected (0.00 sec)
mysql> set character_set_connection=utf8;
Query OK, 0 rows affected (0.00 sec)
mysql> set character_set_results=utf8;
Query OK, 0 rows affected (0.00 sec)
mysql> set character_set_server=utf8;
Query OK, 0 rows affected (0.00 sec)
但重启后会失效。
?
可以修改配置文件：
[root@Hadoop48 ~]# vi /etc/my.cnf [mysql] default-character-set=utf8 [client] default-character-set=utf8 [mysqld] default-character-set=utf8 character_set_server=utf8 init_connect='SET NAMES utf8'
?重启mysql，这样确保缺省编码是utf8
[root@Hadoop48 ~]# service mysqld restart
?查看是否变成utf8：
mysql> \s -------------- mysql Ver 14.12 Distrib 5.0.95, for redhat-linux-gnu (x86_64) using readline 5.1 Connection id: 2 Current database: toplists Current user: root@localhost SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.0.95 Source distribution Protocol version: 10 Connection: Localhost via UNIX socket Server characterset: utf8 Db characterset: utf8 Client characterset: utf8 Conn. characterset: utf8 UNIX socket: /var/lib/mysql/mysql.sock Uptime: 39 sec Threads: 1 Questions: 12 Slow queries: 0 Opens: 15 Flush tables: 1 Open tables: 9 Queries per second avg: 0.308 -------------- mysql> show variables like "char%"; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8 | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+ 8 rows in set (0.00 sec) mysql> show variables like "colla%"; +----------------------+-----------------+ | Variable_name | Value | +----------------------+-----------------+ | collation_connection | utf8_general_ci | | collation_database | utf8_general_ci | | collation_server | utf8_general_ci | +----------------------+-----------------+ 3 rows in set (0.00 sec)
?将mysql编码改成utf8，并在命令行中指定编码为utf8，执行导出报错：
[zhouhh@Hadoop46 ~]$ sqoop export --connect "jdbc:mysql://Hadoop48/toplists?useUnicode=true&characterEncoding=utf-8" -m 1 --table award --export-dir /user/hive/warehouse/hive_myaward/000000_0 --input-null-string "\\\\N" --input-null-non-string "\\\\N" --input-fields-terminated-by "\\01" --input-lines-terminated-by "\\n" 12/07/20 13:17:22 INFO mapred.JobClient: Task Id : attempt_201207191159_0233_m_000000_0, Status : FAILED java.io.IOException: java.sql.SQLException: Incorrect string value: '\xE6\x9D\x80\xE7\xA0\xB4...' for column 'nick' at row 1
?原来我创建的表缺省编码不是utf8的，也需改变一下。
mysql> ALTER TABLE award CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; Query OK, 0 rows affected (0.00 sec) Records: 0 Duplicates: 0 Warnings: 0
?再导出
[zhouhh@Hadoop46 ~]$ sqoop export --connect "jdbc:mysql://Hadoop48/toplists?useUnicode=true&characterEncoding=utf-8" -m 1 --table award --export-dir /user/hive/warehouse/hive_myaward/000000_0 --input-null-string "\\\\N" --input-null-non-string "\\\\N" --input-fields-terminated-by "\\01" --input-lines-terminated-by "\\n" ... 12/07/20 14:03:10 INFO mapred.JobClient: map 0% reduce 0% 12/07/20 14:03:24 INFO mapred.JobClient: map 100% reduce 0% ... 12/07/20 14:03:29 INFO mapreduce.ExportJobBase: Exported 2 record
?
检查表 mysql> select * from award; +-------------------------------+-----------+-----------+------+-----------+-----------+--------+------+-------------+-----------------+---------+ | rowkey | productid | matchid | rank | tourneyid | userid | gameid | gold | loginid | nick | plat | +-------------------------------+-----------+-----------+------+-----------+-----------+--------+------+-------------+-----------------+---------+ | 2012-04-27 06:55:00:402713629 | 5947 | 433203828 | 2 | 4027102 | 402713629 | 1001 | NULL | 715878221 | 杀破天A | ios | | 2012-04-27 06:55:00:406788559 | 778 | 433203930 | 19 | 4017780 | 406788559 | 1001 | 1 | 13835155880 | 亲牛牛旦旦 | android | +-------------------------------+-----------+-----------+------+-----------+-----------+--------+------+-------------+-----------------+---------+ 2 rows in set (0.00 sec)
?中文编码问题解决。
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