Spring Boot+MySQL注册报错：Data too long for column 'password'

未添加密码哈希时注册功能正常，使用BCrypt加密密码后，抛出数据截断错误，提示密码列长度不足。

错误日志 #

com.mysql.cj.jdbc.exceptions.MysqlDataTruncation: Data truncation: Data too long for column 'password' at row 1
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:104) ~[mysql-connector-j-8.0.31.jar:8.0.31]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:916) ~[mysql-connector-j-8.0.31.jar:8.0.31]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1061) ~[mysql-connector-j-8.0.31.jar:8.0.31]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1009) ~[mysql-connector-j-8.0.31.jar:8.0.31]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeLargeUpdate(ClientPreparedStatement.java:1320) ~[mysql-connector-j-8.0.31.jar:8.0.31]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdate(ClientPreparedStatement.java:994) ~[mysql-connector-j-8.0.31.jar:8.0.31]
    at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) ~[HikariCP-4.0.3.jar:na]
    at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) ~[HikariCP-4.0.3.jar:na]
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:197) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:46) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3375) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3908) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:107) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.engine.spi.ActionQueue.lambda$executeActions$1(ActionQueue.java:478) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:1.8.0_202]
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:475) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:344) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:40) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1407) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:489) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3303) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2438) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:449) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:183) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:40) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:281) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:101) ~[hibernate-core-5.6.12.Final.jar:5.6.12.Final]
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:562) ~[spring-orm-5.3.23.jar:5.3.23]
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:743) ~[spring-tx-5.3.23.jar:5.3.23]
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:711) ~[spring-tx-5.3.23.jar:5.3.23]

相关代码 #

EmployeeIMPL.java #

@Service
public class EmployeeIMPL implements EmployeeService {

    @Autowired
    private EmployeeRepo employeeRepo;

    PasswordEncoder passwordEncoder;
    @Override
    public String addEmployee(EmployeeDTO employeeDTO) {


        this.passwordEncoder = new BCryptPasswordEncoder();

        Employee employee = new Employee(

                employeeDTO.getEmployeeid(),
                employeeDTO.getEmployeename(),
                employeeDTO.getEmail(),

                this.passwordEncoder.encode(employeeDTO.getPassword())
        );

        employeeRepo.save(employee);

        return employee.getEmployeename();
    }
}

Employee 实体类 #

@Id
@Column(name="employee_id", length = 45)
@GeneratedValue(strategy = GenerationType.AUTO)
private int employeeid;

@Column(name="employee_name", length = 255)
private String employeename;

@Column(name="email", length = 255)
private String email;

@Column(name="password", length = 20)
private String password;

解决方案 #

问题根源：BCrypt加密后的密码固定为60位字符串，而实体类和数据库密码列仅设置了20位长度，导致插入时数据截断。

解决步骤：

1. 修改实体类密码字段长度：将@Column(name="password", length = 20)改为@Column(name="password", length = 60)，确保能容纳加密后的密码：

   @Column(name="password", length = 60)
   private String password;
   

2. 同步更新数据库表结构：手动修改MySQL中employee表的password列长度，执行SQL：

   ALTER TABLE employee MODIFY COLUMN password VARCHAR(60);
   

3. 优化密码编码器注入：避免在方法内重复创建编码器实例，通过Spring注入更规范：
   新增配置类：

   @Configuration
   public class SecurityConfig {
       @Bean
       public PasswordEncoder passwordEncoder() {
           return new BCryptPasswordEncoder();
       }
   }
   

   修改EmployeeIMPL注入编码器：

   @Service
   public class EmployeeIMPL implements EmployeeService {
   
       @Autowired
       private EmployeeRepo employeeRepo;
   
       @Autowired
       private PasswordEncoder passwordEncoder;
   
       @Override
       public String addEmployee(EmployeeDTO employeeDTO) {
           Employee employee = new Employee(
                   employeeDTO.getEmployeeid(),
                   employeeDTO.getEmployeename(),
                   employeeDTO.getEmail(),
                   passwordEncoder.encode(employeeDTO.getPassword())
           );
           employeeRepo.save(employee);
           return employee.getEmployeename();
       }
   }
   

内容的提问来源于stack exchange，提问作者abi jega