背景：
数据库编码，建表编码，Content字段编码都设置为utf8，collation是默认的utf8_default(也尝试过修改为其他的，未果，似乎不是collation的问题)
mysql> status;--------------mysql Ver 14.14 Distrib 5.1.49, for debian-linux-gnu (i686) using readline 6.1Connection id:
1402357Current database:
**Current user:
**SSL:
Not in useCurrent pager:
stdoutUsing outfile:
''Using delimiter:
;Server version:
5.0.38 Debian etch distributionProtocol version:
10Connection:
** via TCP/IPServer characterset:
gbkDb characterset:
utf8Client characterset:
utf8Conn. characterset:
utf8TCP port:
4307Uptime: 187 days 22 hours 51 min 18 secThreads: 16 Questions: 409901760 Slow queries: 12290 Opens: 899 Flush tables: 1 Open tables: 246 Queries per second avg: 25.242--------------
现象：
插入的数据中如果含有某些特殊字符，会导致插入数据失败，例如字符串”测试**插入数据。。。“，在console中insert是正常的，但是使用java代码insert的时候报错：
2012-02-06 14:44:43,741 ERROR BlaBlaServiceImpl:110 - insertOrUpdateBlaBla failed!org.springframework.jdbc.UncategorizedSQLException: SqlMapClient operation; uncategorized SQLException for SQL []; SQL state [HY000]; error code [1366];--- The error occurred in com/company/project/base/BlaBla/BlaBla.xml.--- The error occurred while applying a parameter map. --- Check the BlaBla.insertBlaBla-InlineParameterMap.--- Check the statement (update failed).--- Cause: java.sql.SQLException: Incorrect string value: '\xF0\x9F\x92\x90</...' for column 'Content' at row 1; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:--- The error occurred in com/company/project/base/BlaBla/BlaBla.xml. --- The error occurred while applying a parameter map. --- Check the BlaBla.insertBlaBla-InlineParameterMap. --- Check the statement (update failed). --- Cause: java.sql.SQLException: Incorrect string value: '\xF0\x9F\x92\x90</...' for column 'Content' at row 1 at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:83) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80) at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:203) at org.springframework.orm.ibatis.SqlMapClientTemplate.insert(SqlMapClientTemplate.java:364) at com.company.project.base.BlaBla.BlaBlaDaoImpl.insertBlaBla(BlaBlaDaoImpl.java:81) at com.company.project.base.BlaBla.BlaBlaServiceImpl.insertBlaBla(BlaBlaServiceImpl.java:108) at com.company.project.check.BlaBla.ReplyRecorder.record(ReplyRecorder.java:66) at com.company.project.check.CheckingChain.run(CheckingChain.java:67)Caused by: com.ibatis.common.jdbc.exception.NestedSQLException:--- The error occurred in com/company/project/base/BlaBla/BlaBla.xml. --- The error occurred while applying a parameter map. --- Check the BlaBla.insertBlaBla-InlineParameterMap. --- Check the statement (update failed). --- Cause: java.sql.SQLException: Incorrect string value: '\xF0\x9F\x92\x90</...' for column 'Content' at row 1 at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeUpdate(MappedStatement.java:107) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.insert(SqlMapExecutorDelegate.java:393) at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.insert(SqlMapSessionImpl.java:82) at org.springframework.orm.ibatis.SqlMapClientTemplate$8.doInSqlMapClient(SqlMapClientTemplate.java:366) at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:200) ... 5 moreCaused by: java.sql.SQLException: Incorrect string value: '\xF0\x9F\x92\x90</...' for column 'Content' at row 1 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3603) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3535) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1989) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2150) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2626) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119) at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1362) at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172) at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172) at com.ibatis.sqlmap.engine.execution.SqlExecutor.executeUpdate(SqlExecutor.java:80) at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.sqlExecuteUpdate(MappedStatement.java:216) at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeUpdate(MappedStatement.java:94) ... 9 more
问题的可能原因：(未证实)
mysql中规定utf8字符MaxLen=3，但是某些unicode字符转成utf8编码之后有4个字节，于是就杯具了
String c = "*" ; byte[] bytes = c.getBytes("utf8"); for(byte b : bytes){ System.out.print(Integer.toHexString(0x00FF & b)+" "); } // 输出 f0 9f 8d 8e
mysql> show character set;+----------+-----------------------------+---------------------+--------+| Charset | Description | Default collation | Maxlen |+----------+-----------------------------+---------------------+--------+| utf8 | UTF-8 Unicode | utf8_general_ci | 3 |+----------+-----------------------------+---------------------+--------+
解决方案：
修改Content字段为MEDIUMBLOB(原来是MEDIUMTEXT)，并且把SELECT语句修改成
SELECT CAST(Content AS CHAR CHARACTER SET utf8) AS Content ....
INSERT语句不需要修改，测试ok
参考资料
http://dev.mysql.com/doc/refman/5.0/en/charset-convert.html CAST函数用法
http://bugs.mysql.com/bug.php?id=30131 07年讨论到10年，结论是: Not a bug
http://stackoverflow.com/questions/2108824/mysql-incorrect-string-value-error-when-save-unicode-string-in-django 问题可能是因为某些unicode字符转成utf8之后变成了4个字节，utf8 max-length=3
1 楼 weiqiang.yang 2012-02-06 好吧，囧了，这个特殊字符je打不出来，而且还截断了
--转自
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