1.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)
当线上系统出现字符字节问题时，mysql中UFT8最大支持3个字节，而我们此时插入4个字节的表情时就会出现问题。

2.解决方案

1.建表的时候添加如下限制：ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
2.对表中的字段设置成utf8mb4 COLLATE=utf8mb4_bin;格式
3.🌟：在项目数据库配置中添加上：
init-connection-sqls: SET NAMES utf8mb4 COLLATE utf8mb4_unicode_ci