Add support to specify the database type with EnableBatchProcessing

Resolves #4320

Author: fmbenhassine

spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/BatchRegistrar.java

@@ -35,6 +35,7 @@
 import org.springframework.core.log.LogMessage;
 import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.util.StopWatch;
+import org.springframework.util.StringUtils;
 
 /**
  * Base registrar that provides common infrastructure beans for enabling and using Spring
@@ -135,6 +136,11 @@ private void registerJobRepository(BeanDefinitionRegistry registry, EnableBatchP
 			beanDefinitionBuilder.addPropertyValue("isolationLevelForCreate", isolationLevelForCreate);
 		}
 
+		String databaseType = batchAnnotation.databaseType();
+		if (StringUtils.hasText(databaseType)) {
+			beanDefinitionBuilder.addPropertyValue("databaseType", databaseType);
+		}
+
 		beanDefinitionBuilder.addPropertyValue("maxVarCharLength", batchAnnotation.maxVarCharLength());
 		beanDefinitionBuilder.addPropertyValue("clobType", batchAnnotation.clobType());
 		registry.registerBeanDefinition("jobRepository", beanDefinitionBuilder.getBeanDefinition());

spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/EnableBatchProcessing.java

@@ -32,6 +32,7 @@
 import org.springframework.batch.core.launch.support.TaskExecutorJobLauncher;
 import org.springframework.batch.core.repository.JobRepository;
 import org.springframework.batch.core.repository.dao.AbstractJdbcBatchMetadataDao;
+import org.springframework.batch.support.DatabaseType;
 import org.springframework.context.annotation.Import;
 import org.springframework.transaction.PlatformTransactionManager;
 
@@ -179,6 +180,15 @@
 	 */
 	String dataSourceRef() default "dataSource";
 
+	/**
+	 * Set the type of the data source to use in the job repository. The default type will
+	 * be introspected from the datasource's metadata.
+	 * @since 5.1
+	 * @see DatabaseType
+	 * @return the type of data source.
+	 */
+	String databaseType() default "";
+
 	/**
 	 * Set the transaction manager to use in the job repository.
 	 * @return the bean name of the transaction manager to use. Defaults to