Column 'box_id' specified twice 错误

使用 Spring Data JPA插入数据到数据表时，抛出如下错误信息：

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Column 'box_id' specified twice

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

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:944)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)

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:2495)

at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1903)

at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2124)

at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2058)

at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5158)

at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2043)

at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_executeUpdate(FilterChainImpl.java:2723)

at com.alibaba.druid.filter.FilterAdapter.preparedStatement_executeUpdate(FilterAdapter.java:1069)

at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_executeUpdate(FilterEventAdapter.java:491)

at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_executeUpdate(FilterChainImpl.java:2721)

at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.executeUpdate(PreparedStatementProxyImpl.java:158)

at com.alibaba.druid.pool.DruidPooledPreparedStatement.executeUpdate(DruidPooledPreparedStatement.java:253)

at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)

at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)

... 123 common frames omitted

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上面错误是因为我们在实体中，使用 @Column 注解重复的声明了某个列。例如：

@Entity
@Table(name = "t_users")
public class User {
    @Id
    @Column(name = "id", nullable = false, length = 10)
    private Long id;

    @Column(name = "name", length = 50)
    private String name;
    
    @Column(name = "name", length = 10)
    private String sex;
}

上面代码中，name 列被重复声明了。将最后一个 name 改为 sex，代码如下：

@Entity
@Table(name = "t_users")
public class User {
    @Id
    @Column(name = "id", nullable = false, length = 10)
    private Long id;

    @Column(name = "name", length = 50)
    private String name;
    
    @Column(name = "sex", length = 10)
    private String sex;
}

问题成功解决。