如何解决shardingsphere报错Missing the data source name:‘null‘

问题描述

使用shardingsphere 尝试进行分库时，报错 Missing the data source name: ‘null’

详细错误内容

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error updating database.  Cause: java.lang.IllegalStateException: Missing the data source name: 'null'### The error may involve defaultParameterMap### The error occurred while setting parameters### SQL: INSERT INTO user (user_id, user_name) VALUES (?, ?)### Cause: java.lang.IllegalStateException: Missing the data source name: 'null'

    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:79)    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)    at com.sun.proxy.$Proxy60.insert(Unknown Source)    at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:279)    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:57)    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)    at com.sun.proxy.$Proxy65.addEntity(Unknown Source)    at com.tianyilan.shardingsphere.demo.service.impl.UserServiceImpl.insertUsers(UserServiceImpl.java:57)    at com.tianyilan.shardingsphere.demo.service.impl.UserServiceImpl.processUsers(UserServiceImpl.java:31)    at com.tianyilan.shardingsphere.demo.UserServiceTest.testProcessUsers(UserServiceTest.java:21)    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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)    at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)    at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)Caused by: org.apache.ibatis.exceptions.PersistenceException: ### Error updating database.  Cause: java.lang.IllegalStateException: Missing the data source name: 'null'### The error may involve defaultParameterMap### The error occurred while setting parameters### SQL: INSERT INTO user (user_id, user_name) VALUES (?, ?)### Cause: java.lang.IllegalStateException: Missing the data source name: 'null'    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:200)    at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185)    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:434)    ... 38 moreCaused by: java.lang.IllegalStateException: Missing the data source name: 'null'    at com.google.common.base.Preconditions.checkState(Preconditions.java:197)    at org.apache.shardingsphere.shardingjdbc.jdbc.adapter.AbstractConnectionAdapter.getConnections(AbstractConnectionAdapter.java:110)    at org.apache.shardingsphere.shardingjdbc.executor.PreparedStatementExecutor$1.getConnections(PreparedStatementExecutor.java:79)    at org.apache.shardingsphere.core.execute.sql.prepare.SQLExecutePrepareTemplate.getSQLExecuteGroups(SQLExecutePrepareTemplate.java:89)    at org.apache.shardingsphere.core.execute.sql.prepare.SQLExecutePrepareTemplate.getSynchronizedExecuteUnitGroups(SQLExecutePrepareTemplate.java:67)    at org.apache.shardingsphere.core.execute.sql.prepare.SQLExecutePrepareTemplate.getExecuteUnitGroups(SQLExecutePrepareTemplate.java:59)    at org.apache.shardingsphere.shardingjdbc.executor.PreparedStatementExecutor.obtainExecuteGroups(PreparedStatementExecutor.java:75)    at org.apache.shardingsphere.shardingjdbc.executor.PreparedStatementExecutor.init(PreparedStatementExecutor.java:70)    at org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.initPreparedStatementExecutor(ShardingPreparedStatement.java:198)    at org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.execute(ShardingPreparedStatement.java:171)    at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:46)    at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74)    at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50)    at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)    at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198)    ... 44 more

解决方法

你所插入的表 没有配置相关的路由信息。

例如我的properties内容如下

spring.shardingsphere.datasource.names=ds0,ds1
spring.shardingsphere.datasource.ds0.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.ds0.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.ds0.url = jdbc:mysql://localhost:3306/shardingsphere_1
spring.shardingsphere.datasource.ds0.username=root
spring.shardingsphere.datasource.ds0.password=123
spring.shardingsphere.datasource.ds1.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.ds1.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.ds1.url = jdbc:mysql://localhost:3306/shardingsphere_2
spring.shardingsphere.datasource.ds1.username=root
spring.shardingsphere.datasource.ds1.password=123
spring.shardingsphere.sharding.default-database-strategy.inline.sharding-column= user_id
spring.shardingsphere.sharding.default-database-strategy.inline.algorithm-expression= ds$->{user_id %2}

spring.shardingsphere.sharding.binding-tables=health_record,health_task
spring.shardingsphere.sharding.broadcast-tables=health_level

#spring.shardingsphere.sharding.tables.user.actual-data-nodes=ds$->{0..1}.user

spring.shardingsphere.sharding.tables.health_record.actual-data-nodes=ds$->{0..1}.health_record
spring.shardingsphere.sharding.tables.health_record.key-generator.column=record_id
spring.shardingsphere.sharding.tables.health_record.key-generator.type=SNOWFLAKE
spring.shardingsphere.sharding.tables.health_record.key-generator.props.worker.id=33
spring.shardingsphere.sharding.tables.health_task.actual-data-nodes=ds$->{0..1}.health_task
spring.shardingsphere.sharding.tables.health_task.key-generator.column=task_id
spring.shardingsphere.sharding.tables.health_task.key-generator.type=SNOWFLAKE
spring.shardingsphere.sharding.tables.health_task.key-generator.props.worker.id=33

#logging.level.com.tianyilan.shardingsphere.demo.entity=debug
spring.shardingsphere.props.sql.show=true

我配置了 health_record,health_task 的路由规则，但是我测试数据插入的表是 user表。

由于没有配置，所以定位不了数据库。

如果更改一下，变成

那么就可以了

解决过程（个人记录）

首先，最终抛出异常的地方 SQLExecutePrepareTemplate 类

划红线的地方执行出错，进去看一下内容

划红线的地方出错，因为dataSourceName 是null。

而这个入参是在PreparedStatementExecutor中传入的（下面的routeUnits）

它是被同类下的（init 方法所调用）

它是被ShardingPreparedStatement 的 （initPreparedStatementExecutor 方法调用）

它是被同类下的 （execute 方法调用）

定位可知，值是从该类的私有变量 routeResult 中获得的，而它是在shard() 方法中赋值的。

这里调用的是BaseShardingEngine

进入route方法

BaseShardingEngine 抽象类的抽象方法

进入它的实现类 PreparedQueryShardingEngine

进入到route，跳转到 PreparedStatementRoutingEngine 类

进入到内层route方法 中 ，跳转到 ParsingSQLRouter

在该类的route方法中我们可以看到

进入到 RoutingEngineFactory.newInstance 查看

它会进入我打断点的这个语句中

进入到 DefaultDatabaseRoutingEngine 可以看到它设置了两个值，其中shardingRule 就包含了dataSourceName的相关信息

查看shardingRule 是怎么设置值得

• RoutingEngineFactory 类中 是通过入参获得的
• ParsingSQLRouter 类中是通过构造参数复制的，
• PreparedStatementRoutingEngine 类中也是通过构造函数给私有成员变量 shardingRouter 赋值的，
• PreparedQueryShardingEngine 类中是通过在狗仔函数中给父类赋值的
• ShardingPreparedStatement 类中通过 构造函数赋值

可以看到ShardingRule 最终是来自 ShardingConnection

再次追踪connection

• PreparedStatementHandler 类中

• 它是被 SimpleExecutor 类调用的

也就是说它来源于 stmt，进去看看

BaseExecutor 类

SpringManagedTransaction 类中

在 DataSourceUtil 类中 doGetConnection 方法

这里获取 connnection 发现 没有相关的 dataSourceName。

然后思考了一下，好像没给表配置路由。

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。

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