MySql中报错：java.sql.SQLException: Incorrect string value: '\xF0\x9F\x90\xBB' for column

问题描述：

java.sql.SQLException: Incorrect string value: '\xF0\x9F\x90\xBB' for column 'nickName' at row 1

        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1094)

        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4226)

        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4158)

        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)

        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)

        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2840)

        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)

        at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1302)

        at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:498)

        at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:55)

        at com.sun.proxy.$Proxy58.execute(Unknown Source)

        at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:41)

        at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:66)

        at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:45)

        at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:100)

        at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:75)

解决方法：

1.建表的时候添加如下限制：ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

2.在my.cnf上修改如下：

------------------my.cnf------------------------------------------------------

# For advice on how to change settings please see

# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html

[client]

default-character-set=utf8mb4

[mysql]

default-character-set = utf8mb4

# Remove leading # and set to the amount of RAM for the most important data

# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.

# innodb_buffer_pool_size = 128M

 

# Remove leading # to turn on a very important data integrity option: logging

# changes to the binary log between backups.

# log_bin

# These are commonly set, remove the # and set as required.

# basedir = .....

# datadir = .....

# port = .....

# server_id = .....

# socket = .....

 

# Remove leading # to set options mainly useful for reporting servers.

# The server defaults are faster for transactions and fast SELECTs.

# Adjust sizes as needed, experiment to find the optimal values.

# join_buffer_size = 128M

# sort_buffer_size = 2M

# read_rnd_buffer_size = 2M

 

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

log-error=/var/log/mysqld.log

long_query_time=3

 

[mysqld]

character-set-client-handshake = FALSE

character-set-server = utf8mb4

collation-server = utf8mb4_unicode_ci

init_connect='SET NAMES utf8mb4'

 

#log-slow-queries= /usr/local/mysql/log/slowquery.log

 ------------------------------------------------------------------------

重启mysql服务，service mysql stop；  service mysql start；问题解决。

造成这个问题的原因（网上找的）：

mysql中规定utf8字符的最大字节数是3，但是某些unicode字符转成utf8编码之后有4个字节，导致出错。