Shardingsphere JDBC keyword problem

Use sharding When , There are two problems . Record ：

1 Configuration problem ：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'shardingDataSource' defined in class path resource [org/apache/shardingsphere/shardingjdbc/spring/boot/SpringBootConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'shardingDataSource' threw exception; nested exception is java.lang.NullPointerException
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1160)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)

The use of springboot+mybatis+yaml To configure . The version is 4.1.1

This is not common without configuration sharding Data source causes empty Error of .

dataSources:
  ds0: !!org.apache.commons.dbcp.BasicDataSource
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/ds0
    username: root
    password: 

There needs to be more type attribute ：

type: com.alibaba.druid.pool.DruidDataSource

About sharding Refer to the manual on the official website .

Yaml To configure :: ShardingSphere

I made a mistake . I only wrote the name of the tabulation Algorithm ,

The right is ：

preciseAlgorithmClassName  The corresponding class name , Be careful yaml Indentation 

Two Keyword error

If the field is used order, mutex etc. mysql key word . Will result in query SQL Parsing exceptions , Or update the spatiotemporal pointer exception .

The hint here is , Suppose an old database has a pile of tables , Only separate individual tables . introduce sharding Although the sub table is specified later bindingTables, The rest go default-data-source It is the default that there is no table .

however sharding Will take over the data source , The old watch uses the default mybatis  normal ,sharding There may be a mistake .