我正在尝试将以下推文存储到长文本列/utf8 字符集/MySQL 5.5 中。启用 MyISAM 存储的数据库。

我们还尝试了 utf8mb4、utf16、utf32 字符集，但无法解决这个问题。

tweet="@Dorable_Dimples: Okay enough of those #IfYouWereMines I'm getting dep
ressed. #foreveralone ?" lol yes

mysql> ALTER DATABASE foo CHARACTER SET utf8 COLLATE utf8_bin;

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 | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /rdsdbbin/mysql-5.5.12.R1/share/charsets/ |

Incorrect string value: '\xF0\x9F\x98\x94\xE2\x80...' for column 'tweet' at row 1

Unable to store tweet "@Dorable_Dimples: Okay enough of those #IfYouWereM
ines I'm getting depressed. #foreveralone ?" lol yes
javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCExcept
ion: could not insert
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityMana
gerImpl.java:1387)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityMana
gerImpl.java:1315)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityMana
gerImpl.java:1321)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityMana
gerImpl.java:843)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)

at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(
SQLStateConverter.java:140)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.ja
va:128)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelpe
r.java:66)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(Abstra
ctReturningDelegate.java:64)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(Abstract
EntityPersister.java:2345)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(Abstract
EntityPersister.java:2852)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentity
InsertAction.java:71)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplica
te(AbstractSaveEventListener.java:320)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(Abstract
SaveEventListener.java:203)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(
AbstractSaveEventListener.java:129)
at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(E
JB3PersistEventListener.java:69)
at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(
DefaultPersistEventListener.java:179)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultP
ersistEventListener.java:135)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultP
ersistEventListener.java:61)
at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:808)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:782)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:786)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityMana
gerImpl.java:837)
... 5 more
Caused by: java.sql.SQLException: Incorrect string value: '\xF0\x9F\x98\x94\xE2\x
80...' for column 'tweet' at row 1
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.jav
a:2127)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:
2427)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:
2345)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:
2330)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAnd
Extract(IdentityGenerator.java:94)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(Abstra
ctReturningDelegate.java:57)

最佳答案

这是导致问题的推文末尾的字符。

它看起来像一个“表情符号”字符，也就是日本笑脸，但它在 Chrome 或 Safari 中都没有显示。

在某些版本的 MySQL 中存储 4 字节 utf 字符存在已知问题。显然你必须使用 utf8mb4 来表示 4 字节的 UTF 字符，因为普通的 utf8 字符集只能表示长度不超过 3 字节的字符，因此不能存储 Basic Multilingual Plane 之外的字符。

http://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html

这对我来说是个新闻，因为它基本上意味着 MySQL 中的 utf8 数据类型并不是真正正确的 utf8。

这里有关于如何处理的建议 How to insert utf-8 mb4 character(emoji in ios5) in mysql?包括:

“还要确保您的应用程序层将其数据库连接的字符集设置为 utf8mb4。仔细检查这是否实际发生 - 如果您正在运行所选框架的 mysql 客户端库的旧版本，它可能尚未编译支持 utf8mb4，它不会正确设置字符集。如果没有，您可能需要更新它或自己编译它"

如果您使用的是 Connector/J，则需要在连接配置中设置 character_set_server=utf8mb4。

您的所有字符集都应该是 utf8mb4，您可能已经尝试过，但目前尚未设置。

关于MySQL抛出不正确的字符串值错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8709892/