1.详细报错信息：
Caused by: org.apache.ibatis.exceptions.PersistenceException:
## Error updating database. Cause: org.apache.shardingsphere.infra.exception.ShardingSphereException: Can not update sharding key since the updated value will change t_contract's data nodes.
## The error may exist in com/demo/module/contract/dao/ContractDao.java (best guess)
## The error may involve com.demo.module.contract.dao.ContractDao.updateById-Inline
## The error occurred while setting parameters
## SQL: UPDATE t_contract SET CONTRACT_ID=?, NAME=?, ACCOUNT=?, CREATE_TIME=?, UPDATE_TIME=? WHERE ID=?
## Cause: org.apache.shardingsphere.infra.exception.ShardingSphereException: Can not update sharding key since the updated value will change t_contract's data nodes.
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:199)
at com.baomidou.mybatisplus.extension.service.impl.ServiceImpl.lambda$updateBatchById$3(ServiceImpl.java:194)
at com.baomidou.mybatisplus.extension.toolkit.SqlHelper.lambda$executeBatch$0(SqlHelper.java:215)
at com.baomidou.mybatisplus.extension.toolkit.SqlHelper.executeBatch(SqlHelper.java:179)
... 118 common frames omitted
Caused by: org.apache.shardingsphere.infra.exception.ShardingSphereException: Can not update sharding key since the updated value will change t_contract's data nodes.
at org.apache.shardingsphere.sharding.route.engine.validator.dml.impl.ShardingUpdateStatementValidator.postValidate(ShardingUpdateStatementValidator.java:54)
at org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.lambda$createRouteContext$1(ShardingSQLRouter.java:57)
at java.util.Optional.ifPresent(Optional.java:159)
at org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.createRouteContext(ShardingSQLRouter.java:57)
at org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.createRouteContext(ShardingSQLRouter.java:44)
at org.apache.shardingsphere.infra.route.engine.impl.PartialSQLRouteExecutor.route(PartialSQLRouteExecutor.java:73)
at org.apache.shardingsphere.infra.route.engine.SQLRouteEngine.route(SQLRouteEngine.java:53)
at org.apache.shardingsphere.infra.context.kernel.KernelProcessor.route(KernelProcessor.java:54)
at org.apache.shardingsphere.infra.context.kernel.KernelProcessor.generateExecutionContext(KernelProcessor.java:46)
at org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSpherePreparedStatement.createExecutionContext(ShardingSpherePreparedStatement.java:431)
at org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSpherePreparedStatement.addBatch(ShardingSpherePreparedStatement.java:500)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:59)
at com.sun.proxy.$Proxy446.addBatch(Unknown Source)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.batch(PreparedStatementHandler.java:58)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.batch(RoutingStatementHandler.java:69)
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.$Proxy444.batch(Unknown Source)
at com.baomidou.mybatisplus.core.executor.MybatisBatchExecutor.doUpdate(MybatisBatchExecutor.java:85)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
at com.baomidou.mybatisplus.core.executor.MybatisCachingExecutor.update(MybatisCachingExecutor.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49)
at com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor.intercept(MybatisPlusInterceptor.java:83)
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
at com.sun.proxy.$Proxy443.update(Unknown Source)
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.$Proxy443.update(Unknown Source)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:197)
... 121 common frames omitted
2.问题原因：
核心报错内容：Can not update sharding key since the updated value will change t_contract’s data nodes.
问题原因： update语句中涉及了分片键值的更新，更新后的键值可能会导致数据所在分片位置，所以分片键的值不可更新。
3.解决方法：
将MybatisPlus版本升级到 3.4.1 以上，在实体类的 @TableFiled 注解中增加参数：updateStrategy = FieldStrategy.NEVER，意思是永远不更新该字段值。如下所示：
import com.baomidou.mybatisplus.annotation.FieldStrategy;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;
import java.io.Serializable;
import java.time.LocalDateTime;
/**
* <p>
* 用户表
* </p>
*
* @author ACGkaka
* @since 2023-04-25
*/
@Data
@NoArgsConstructor
@EqualsAndHashCode(callSuper = false)
@TableName("t_user")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
/**
* 主键
*/
@TableId(value = "id")
private Long id;
/**
* 用户名
*/
@TableField("username")
private String username;
/**
* 密码
*/
@TableField("password")
private String password;
/**
* 年龄
*/
@TableField("age")
private Integer age;
/**
* 创建时间
*/
@TableField(value = "createTime", updateStrategy = FieldStrategy.NEVER)
private LocalDateTime createTime;
/**
* 更新时间
*/
@TableField("updateTime")
private LocalDateTime updateTime;
}
整理完毕，完结撒花~