com.mysql.jdbc.MysqlDataTruncation:Data Truncation:Data too long for column '字段name' at row 1

1.问题描述：

　　在mysql插入数据的时候报错：Cause: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data too long for column 'xxx_name' at row 1

严重: Servlet.service() for servlet default threw exceptio
com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data too long for column 'xxx_name' at row 1
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2868)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
 at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1160)
 at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:685)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1400)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1314)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1299)
 at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105)
 at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:745)
 at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:538)
 at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:739)
 at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:797)
 at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:805)
 at com.bester.blog.dao.impl.UserDAOImpl.add(UserDAOImpl.java:25)
 at com.bester.blog.service.impl.UserServiceImpl.add(UserServiceImpl.java:12)
 at com.bester.blog.web.action.UserAction.add(UserAction.java:30)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)

2.问题分析：

　　从字面意思看，是字段长度不够。即使设置为了text还是不够，因为text类型是可变长度的字符串，最多65535个字符，所有，最好是把字段类型设置为longtext，最多存放4294967295个字符

　　步骤：进入mysql，use你要改变的数据库，执行语句：alter table testTable modify column xxx_name longtext;

　　重启mysql，linux下语句：service mysqld restart

　　但是，我的xxx_name字段设置的是varchar(50)，而输入的没几个字；

　　原因在于：建表的时候，表的编码和字段编码都是默认的latin1，设置为utf8后，问题解决。修改utf-8编码