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。

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