Refactor JDBC DAOs to use JdbcClient where feasible

Closes GH-4804

Signed-off-by: Yanming Zhou <zhouyanming@gmail.com>

Author: quaff

spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/AbstractJdbcBatchMetadataDao.java

@@ -32,6 +32,7 @@
 import org.springframework.core.convert.support.ConfigurableConversionService;
 import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.jdbc.core.JdbcOperations;
+import org.springframework.jdbc.core.simple.JdbcClient;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
@@ -41,6 +42,7 @@
  *
  * @author Robert Kasanicky
  * @author Mahmoud Ben Hassine
+ * @author Yanming Zhou
  */
 public abstract class AbstractJdbcBatchMetadataDao implements InitializingBean {
 
@@ -61,6 +63,8 @@ public abstract class AbstractJdbcBatchMetadataDao implements InitializingBean {
 
 	private @Nullable ConfigurableConversionService conversionService;
 
+	private @Nullable JdbcClient jdbcClient;
+
 	protected String getQuery(String base) {
 		return StringUtils.replace(base, "%PREFIX%", tablePrefix);
 	}
@@ -80,12 +84,17 @@ public void setTablePrefix(String tablePrefix) {
 
 	public void setJdbcTemplate(JdbcOperations jdbcTemplate) {
 		this.jdbcTemplate = jdbcTemplate;
+		this.jdbcClient = JdbcClient.create(jdbcTemplate);
 	}
 
 	@Nullable protected JdbcOperations getJdbcTemplate() {
 		return jdbcTemplate;
 	}
 
+	@Nullable protected JdbcClient getJdbcClient() {
+		return jdbcClient;
+	}
+
 	public int getClobTypeToUse() {
 		return clobTypeToUse;
 	}
@@ -110,6 +119,7 @@ public void setConversionService(ConfigurableConversionService conversionService
 	@Override
 	public void afterPropertiesSet() throws Exception {
 		Assert.state(jdbcTemplate != null, "JdbcOperations is required");
+		Assert.state(jdbcClient != null, "JdbcClient is required");
 		if (this.conversionService == null) {
 			DefaultConversionService conversionService = new DefaultConversionService();
 			conversionService.addConverter(new DateToStringConverter());

spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/jdbc/JdbcExecutionContextDao.java

@@ -27,7 +27,6 @@
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
-import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.concurrent.locks.Lock;
@@ -65,7 +64,7 @@ public class JdbcExecutionContextDao extends AbstractJdbcBatchMetadataDao implem
 	private static final String FIND_JOB_EXECUTION_CONTEXT = """
 			SELECT SHORT_CONTEXT, SERIALIZED_CONTEXT
 			FROM %PREFIX%JOB_EXECUTION_CONTEXT
-			WHERE JOB_EXECUTION_ID = ?
+			WHERE JOB_EXECUTION_ID = :jobExecutionId
 			""";
 
 	private static final String INSERT_JOB_EXECUTION_CONTEXT = """
@@ -82,7 +81,7 @@ public class JdbcExecutionContextDao extends AbstractJdbcBatchMetadataDao implem
 	private static final String FIND_STEP_EXECUTION_CONTEXT = """
 			SELECT SHORT_CONTEXT, SERIALIZED_CONTEXT
 			FROM %PREFIX%STEP_EXECUTION_CONTEXT
-			WHERE STEP_EXECUTION_ID = ?
+			WHERE STEP_EXECUTION_ID = :stepExecutionId
 			""";
 
 	private static final String INSERT_STEP_EXECUTION_CONTEXT = """
@@ -98,12 +97,12 @@ public class JdbcExecutionContextDao extends AbstractJdbcBatchMetadataDao implem
 
 	private static final String DELETE_STEP_EXECUTION_CONTEXT = """
 			DELETE FROM %PREFIX%STEP_EXECUTION_CONTEXT
-			WHERE STEP_EXECUTION_ID = ?
+			WHERE STEP_EXECUTION_ID = :stepExecutionId
 			""";
 
 	private static final String DELETE_JOB_EXECUTION_CONTEXT = """
 			DELETE FROM %PREFIX%JOB_EXECUTION_CONTEXT
-			WHERE JOB_EXECUTION_ID = ?
+			WHERE JOB_EXECUTION_ID = :jobExecutionId
 			""";
 
 	private Charset charset = StandardCharsets.UTF_8;
@@ -154,29 +153,24 @@ public ExecutionContext getExecutionContext(JobExecution jobExecution) {
 		Long executionId = jobExecution.getId();
 		Assert.notNull(executionId, "ExecutionId must not be null.");
 
-		List<ExecutionContext> results = getJdbcTemplate().query(getQuery(FIND_JOB_EXECUTION_CONTEXT),
-				new ExecutionContextRowMapper(), executionId);
-		if (!results.isEmpty()) {
-			return results.get(0);
-		}
-		else {
-			return new ExecutionContext();
-		}
+		return getJdbcClient().sql(getQuery(FIND_JOB_EXECUTION_CONTEXT))
+			.param("jobExecutionId", executionId)
+			.query(new ExecutionContextRowMapper())
+			.optional()
+			.orElseGet(ExecutionContext::new);
+
 	}
 
 	@Override
 	public ExecutionContext getExecutionContext(StepExecution stepExecution) {
 		Long executionId = stepExecution.getId();
 		Assert.notNull(executionId, "ExecutionId must not be null.");
 
-		List<ExecutionContext> results = getJdbcTemplate().query(getQuery(FIND_STEP_EXECUTION_CONTEXT),
-				new ExecutionContextRowMapper(), executionId);
-		if (results.size() > 0) {
-			return results.get(0);
-		}
-		else {
-			return new ExecutionContext();
-		}
+		return getJdbcClient().sql(getQuery(FIND_STEP_EXECUTION_CONTEXT))
+			.param("stepExecutionId", executionId)
+			.query(new ExecutionContextRowMapper())
+			.optional()
+			.orElseGet(ExecutionContext::new);
 	}
 
 	@Override
@@ -256,7 +250,9 @@ public void saveExecutionContexts(Collection<StepExecution> stepExecutions) {
 	 */
 	@Override
 	public void deleteExecutionContext(JobExecution jobExecution) {
-		getJdbcTemplate().update(getQuery(DELETE_JOB_EXECUTION_CONTEXT), jobExecution.getId());
+		getJdbcClient().sql(getQuery(DELETE_JOB_EXECUTION_CONTEXT))
+			.param("jobExecutionId", jobExecution.getId())
+			.update();
 	}
 
 	/**
@@ -265,7 +261,9 @@ public void deleteExecutionContext(JobExecution jobExecution) {
 	 */
 	@Override
 	public void deleteExecutionContext(StepExecution stepExecution) {
-		getJdbcTemplate().update(getQuery(DELETE_STEP_EXECUTION_CONTEXT), stepExecution.getId());
+		getJdbcClient().sql(getQuery(DELETE_STEP_EXECUTION_CONTEXT))
+			.param("stepExecutionId", stepExecution.getId())
+			.update();
 	}
 
 	@Override
@@ -294,16 +292,13 @@ private void persistSerializedContext(Long executionId, String serializedContext
 			longContext = null;
 		}
 
-		getJdbcTemplate().update(getQuery(sql), ps -> {
-			ps.setString(1, shortContext);
-			if (longContext != null) {
-				ps.setString(2, longContext);
-			}
-			else {
-				ps.setNull(2, getClobTypeToUse());
-			}
-			ps.setLong(3, executionId);
-		});
+		getJdbcClient().sql(getQuery(sql))
+		// @formatter:off
+				.param(1, shortContext)
+				.param(2, longContext, getClobTypeToUse())
+				.param(3, executionId)
+		// @formatter:on
+			.update();
 	}
 
 	/**