如何解决Spring Batch为什么表'batch_job_instance'已经存在？
我是 Spring Batch 的新手，刚刚在 Spring Batch 中运行我的第一个项目。
但是当我在 Spring Batch 中配置数据库时，它会抛出错误。
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-05-23 13:29:58.390 ERROR 19733 --- [ main] o.s.boot.SpringApplication : Application run Failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSourceScriptDatabaseInitializer' defined in class path resource [org/springframework/boot/autoconfigure/sql/init/DataSourceInitializationConfiguration.class]: Invocation of init method Failed; nested exception is org.springframework.jdbc.datasource.init.ScriptStatementFailedException: Failed to execute sql script statement #1 of class path resource [org/springframework/batch/core/schema-MysqL.sql]: CREATE TABLE BATCH_JOB_INSTANCE ( JOB_INSTANCE_ID BIGINT NOT NULL PRIMARY KEY,VERSION BIGINT,JOB_NAME VARCHAR(100) NOT NULL,JOB_KEY VARCHAR(32) NOT NULL,constraint JOB_INST_UN unique (JOB_NAME,JOB_KEY) ) ENGINE=InnoDB; nested exception is java.sql.sqlSyntaxErrorException: Table 'batch_job_instance' already exists
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.initializeBean(AbstractAutowireCapablebeanfactory.java:1786) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:602) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:524) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:335) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:333) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:208) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:322) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:208) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.DefaultListablebeanfactory.preInstantiateSingletons(DefaultListablebeanfactory.java:944) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.context.support.AbstractApplicationContext.finishbeanfactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.7.jar:5.3.7]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.7.jar:5.3.7]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:438) [spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:337) [spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1336) [spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1325) [spring-boot-2.5.0.jar:2.5.0]
at com.example.demo.DemoApplication.main(DemoApplication.java:10) [classes/:na]
Caused by: org.springframework.jdbc.datasource.init.ScriptStatementFailedException: Failed to execute sql script statement #1 of class path resource [org/springframework/batch/core/schema-MysqL.sql]: CREATE TABLE BATCH_JOB_INSTANCE ( JOB_INSTANCE_ID BIGINT NOT NULL PRIMARY KEY,JOB_KEY) ) ENGINE=InnoDB; nested exception is java.sql.sqlSyntaxErrorException: Table 'batch_job_instance' already exists
at org.springframework.jdbc.datasource.init.ScriptUtils.executesqlScript(ScriptUtils.java:622) ~[spring-jdbc-5.3.7.jar:5.3.7]
at org.springframework.jdbc.datasource.init.ResourceDatabasePopulator.populate(ResourceDatabasePopulator.java:254) ~[spring-jdbc-5.3.7.jar:5.3.7]
at org.springframework.jdbc.datasource.init.DatabasePopulatorUtils.execute(DatabasePopulatorUtils.java:49) ~[spring-jdbc-5.3.7.jar:5.3.7]
at org.springframework.boot.jdbc.init.DataSourceScriptDatabaseInitializer.runScripts(DataSourceScriptDatabaseInitializer.java:72) ~[spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.sql.init.AbstractScriptDatabaseInitializer.runScripts(AbstractScriptDatabaseInitializer.java:131) ~[spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.sql.init.AbstractScriptDatabaseInitializer.applyScripts(AbstractScriptDatabaseInitializer.java:91) ~[spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.sql.init.AbstractScriptDatabaseInitializer.applySchemaScripts(AbstractScriptDatabaseInitializer.java:81) ~[spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.sql.init.AbstractScriptDatabaseInitializer.initializeDatabase(AbstractScriptDatabaseInitializer.java:75) ~[spring-boot-2.5.0.jar:2.5.0]
at org.springframework.boot.sql.init.AbstractScriptDatabaseInitializer.afterPropertiesSet(AbstractScriptDatabaseInitializer.java:65) ~[spring-boot-2.5.0.jar:2.5.0]
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.invokeInitMethods(AbstractAutowireCapablebeanfactory.java:1845) ~[spring-beans-5.3.7.jar:5.3.7]
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.initializeBean(AbstractAutowireCapablebeanfactory.java:1782) ~[spring-beans-5.3.7.jar:5.3.7]
... 17 common frames omitted
Caused by: java.sql.sqlSyntaxErrorException: Table 'batch_job_instance' already exists
at com.MysqL.cj.jdbc.exceptions.sqlError.createsqlException(sqlError.java:120) ~[mysql-connector-java-8.0.25.jar:8.0.25]
at com.MysqL.cj.jdbc.exceptions.sqlExceptionsMapping.translateException(sqlExceptionsMapping.java:122) ~[mysql-connector-java-8.0.25.jar:8.0.25]
at com.MysqL.cj.jdbc.StatementImpl.executeInternal(StatementImpl.java:762) ~[mysql-connector-java-8.0.25.jar:8.0.25]
at com.MysqL.cj.jdbc.StatementImpl.execute(StatementImpl.java:646) ~[mysql-connector-java-8.0.25.jar:8.0.25]
at com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:94) ~[HikariCP-4.0.3.jar:na]
at com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java) ~[HikariCP-4.0.3.jar:na]
at org.springframework.jdbc.datasource.init.ScriptUtils.executesqlScript(ScriptUtils.java:601) ~[spring-jdbc-5.3.7.jar:5.3.7]
... 27 common frames omitted
Process finished with exit code 1
它说 Table 'batch_job_instance' already exists，但我只是创建了一个新架构来运行这个项目。我不知道为什么它说已经存在。
这是我的数据源配置：
spring.datasource.url=jdbc:MysqL://localhost:3306/springbatch
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.MysqL.cj.jdbc.Driver
spring.sql.init.schema-locations=classpath:/org/springframework/batch/core/schema-MysqL.sql
spring.batch.jdbc.initialize-schema=always
我搜索了一些问题并遵循了他们的建议，例如将 initialize-schema 更改为 never。但这无济于事。
有大佬知道怎么解决吗？非常感谢。
解决方法
在此之前，您应该手动创建表或执行一次应用程序。
既然您已经设置了 spring.batch.jdbc.initialize-schema=always，您需要确保在运行您的应用之前删除所有批处理表，它应该可以按预期工作。
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