报错Duplicate entry ‘值‘ for key ‘字段名‘的解决解决方法

川长思鸟来 2024-04-01 18:32 116阅读 0赞

遇到这种问题， 是你的数据库表那个字段设置了唯一索引。所以这个字段新增的数据不能重复。具体可以打开表，然后点击表设置，具体教程可以看下文章最后

![61e0d358ebba46b783fb1975b3d76287.png][]

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '测试' for key 'teacher.uk\_name'  
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)  
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)  
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)  
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)  
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)  
at com.mysql.jdbc.Util.getInstance(Util.java:408)  
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)  
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976)  
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912)  
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)  
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)  
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2486)  
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)  
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1197)  
at com.zaxxer.hikari.pool.ProxyPreparedStatement.execute(ProxyPreparedStatement.java:44)  
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.execute(HikariProxyPreparedStatement.java)  
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)  
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:59)  
at com.sun.proxy.$Proxy118.execute(Unknown Source)  
at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:47)  
at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74)  
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)  
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)  
at java.lang.reflect.Method.invoke(Method.java:498)  
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)  
at com.sun.proxy.$Proxy116.update(Unknown Source)  
at com.baomidou.mybatisplus.core.executor.MybatisSimpleExecutor.doUpdate(MybatisSimpleExecutor.java:54)  
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)  
at com.baomidou.mybatisplus.core.executor.MybatisCachingExecutor.update(MybatisCachingExecutor.java:83)  
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:197)  
at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:184)  
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)  
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)  
at java.lang.reflect.Method.invoke(Method.java:498)  
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)  
... 61 more

点击表设置查看索引

![2d924eb6908940bd97bc69c79dce6f57.png][]

![c1a14210fa314b6c8b31592149a7b6a9.png][]

这下明白了把。一般不建议改这个唯一索引，毕竟当初这样设计肯定有这样设计的原因的。只要在前端给用户反馈一个 重复 的说明就行了

[61e0d358ebba46b783fb1975b3d76287.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/def30eefca8b432cbb0b0ebee73e7c69.png
[2d924eb6908940bd97bc69c79dce6f57.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/e061c8818f064136bbaff7cacce4354e.png
[c1a14210fa314b6c8b31592149a7b6a9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/f58d7b109fe54809b1008195d1818b61.png