運行 Spring Batch 時無法初始化閱讀器。
我正在運行spring batch，我需要從表中讀取資料并列印出來。現在，當我運行時，我在閱讀器中遇到錯誤。我有幾種方法，但兩者都給出了一些錯誤。
這是我正在嘗試的一種方法。
@Configuration
@EnableBatchProcessing
public class BatchConfing {
private MyRepo myRepo;
@Autowired
private JobBuilderFactory jbf;
static String str = “Pass”;
private static final String QUERY_FIND_STUDENTS =
"select "
“Stu_info”
"FROM myTable "
"where status = " str;
@Autowired
private DataSource dataSource;
@Bean
public ItemReader<StudentDTO> itemReader() {
return new JdbcCursorItemReaderBuilder<StudentDTO>()
.name("cursorItemReader")
.dataSource(dataSource)
.sql(QUERY_FIND_STUDENTS)
.rowMapper(new BeanPropertyRowMapper<>(StudentDTO.class))
.build();
}
@Bean
public ItemWriter<StudentDTO> writer(){
return value -> {
System.out.println(value.toString());
};
}
@Bean
public JobExecutionListener listener() {
return new ScheduelListener();
}
@Autowired
private StepBuilderFactory sbf;
@Bean
public Step stepA() {
return sbf.get("stepA")
.<StudentDTO,StudentDTO>chunk(2)
.reader(itemReader())
.writer(writer())
.build()
;
}
@Bean
public Job jobA(){
return jbf.get("jobA")
.incrementer(new RunIdIncrementer())
.listener(listener())
.start(stepA())
.build()
;
}
}
現在我無法初始化閱讀器。我在這里想念什么。
堆疊跟蹤 ：
Job started at: Mon Oct 17 09:33:01 IST 2022
Status of the Job: STARTED
2022-10-17 09:33:01.641 INFO 72998 --- [ main] o.s.batch.core.job.SimpleStepHandler : Executing step: [stepA]
2022-10-17 09:33:03.476 ERROR 72998 --- [ main] o.s.batch.core.step.AbstractStep : Encountered an error executing step stepA in job jobA
org.springframework.batch.item.ItemStreamException: Failed to initialize the reader
at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:153) ~[spring-batch-infrastructure-4.3.7.jar:4.3.7]
at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:104) ~[spring-batch-infrastructure-4.3.7.jar:4.3.7]
at org.springframework.batch.core.step.tasklet.TaskletStep.open(TaskletStep.java:311) ~[spring-batch-core-4.3.7.jar:4.3.7]
at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:205) ~[spring-batch-core-4.3.7.jar:4.3.7]
at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:152) ~[spring-batch-core-4.3.7.jar:4.3.7]
at org.springframework.batch.core.job.AbstractJob.handleStep(AbstractJob.java:413) ~[spring-batch-core-4.3.7.jar:4.3.7]
at org.springframework.batch.core.job.SimpleJob.doExecute(SimpleJob.java:136) ~[spring-batch-core-4.3.7.jar:4.3.7]
at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:320) ~[spring-batch-core-4.3.7.jar:4.3.7]
at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:149) ~[spring-batch-core-4.3.7.jar:4.3.7]
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) ~[spring-core-5.3.23.jar:5.3.23]
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:140) ~[spring-batch-core-4.3.7.jar:4.3.7]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:577) ~[na:na]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344) ~[spring-aop-5.3.23.jar:5.3.23]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) ~[spring-aop-5.3.23.jar:5.3.23]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.23.jar:5.3.23]
at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:128) ~[spring-batch-core-4.3.7.jar:4.3.7]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.23.jar:5.3.23]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.23.jar:5.3.23]
at jdk.proxy2/jdk.proxy2.$Proxy95.run(Unknown Source) ~[na:na]
at com..fsspringscheduler.batch.JobRunner.run(JobRunner.java:32) ~[classes/:na]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:771) ~[spring-boot-2.7.4.jar:2.7.4]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:755) ~[spring-boot-2.7.4.jar:2.7.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.7.4.jar:2.7.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) ~[spring-boot-2.7.4.jar:2.7.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) ~[spring-boot-2.7.4.jar:2.7.4]
at com..fsspringscheduler.FsSqsSchedulerApplication.main(FsSqsSchedulerApplication.java:11) ~[classes/:na]
Caused by: org.springframework.jdbc.BadSqlGrammarException: Executing query; bad SQL grammar [select Stu_info FROM myTable where status = PASS]; nested exception is java.sql.SQLSyntaxErrorException: Unknown column 'PASS' in 'where clause'
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:239) ~[spring-jdbc-5.3.23.jar:5.3.23]
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:70) ~[spring-jdbc-5.3.23.jar:5.3.23]
at org.springframework.batch.item.database.AbstractCursorItemReader.translateSqlException(AbstractCursorItemReader.java:226) ~[spring-batch-infrastructure-4.3.7.jar:4.3.7]
at org.springframework.batch.item.database.JdbcCursorItemReader.openCursor(JdbcCursorItemReader.java:133) ~[spring-batch-infrastructure-4.3.7.jar:4.3.7]
at org.springframework.batch.item.database.AbstractCursorItemReader.doOpen(AbstractCursorItemReader.java:453) ~[spring-batch-infrastructure-4.3.7.jar:4.3.7]
at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:150) ~[spring-batch-infrastructure-4.3.7.jar:4.3.7]
... 26 common frames omitted
Caused by: java.sql.SQLSyntaxErrorException: Unknown column 'PASS' in 'where clause'
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120) ~[mysql-connector-java-8.0.30.jar:8.0.30]
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122) ~[mysql-connector-java-8.0.30.jar:8.0.30]
at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:916) ~[mysql-connector-java-8.0.30.jar:8.0.30]
at com.mysql.cj.jdbc.ClientPreparedStatement.executeQuery(ClientPreparedStatement.java:972) ~[mysql-connector-java-8.0.30.jar:8.0.30]
at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52) ~[HikariCP-4.0.3.jar:na]
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java) ~[HikariCP-4.0.3.jar:na]
at org.springframework.batch.item.database.JdbcCursorItemReader.openCursor(JdbcCursorItemReader.java:128) ~[spring-batch-infrastructure-4.3.7.jar:4.3.7]
... 28 common frames omitted
2022-10-17 09:33:03.584 INFO 72998 --- [ main] o.s.batch.core.step.AbstractStep : Step: [stepA] executed in 1s938ms
Job Ended at: Mon Oct 17 09:33:03 IST 2022
Status of the Job: FAILED
2022-10-17 09:33:04.000 INFO 72998 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [SimpleJob: [name=jobA]] completed with the following parameters: [{time=1665979379235}] and the following status: [FAILED] in 2s772ms
JOB Execution completed!
2022-10-17 09:33:04.128 INFO 72998 --- [ionShutdownHook] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2022-10-17 09:33:04.196 INFO 72998 --- [ionShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2022-10-17 09:33:04.294 INFO 72998 --- [ionShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
Disconnected from the target VM, address: '127.0.0.1:54693', transport: 'socket'
uj5u.com熱心網友回復：
顯然從堆疊跟蹤，SQL
select Stu_info FROM myTable where status = PASS
您配置的QUERY_FIND_STUDENTS有一些語法錯誤。您需要根據您的資料庫架構檢查它以進行故障排除。
例如，表myTable真的有列status嗎？或者僅僅是因為您錯過了PASSwhere 子句中值周圍的單引號？
更新：從大衛的反饋來看，問題確實是因為缺少 value 周圍的單引號PASS。因此，在他將 SQL 修復為：
select Stu_info FROM myTable where status = 'PASS'
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