spring batch:在tasklet中查询存储过程结果的有效方式
spring batch: efficient way to query results of a stored procedure within a tasklet
我的目标是在 spring 批处理 tasklet 中使用自定义行映射器查询存储过程(sql 服务器)的结果。
我正在使用 Spring Boot(版本 2.2.2.RELEASE)和 Spring Batch(4.2.1.RELEASE)。
示例:
存储过程:
CREATE PROCEDURE storedProcName @numbers VARCHAR(max), @day DATE
AS
SET NOCOUNT ON;
SELECT something, something2, something3
FROM sometable
WHERE ids in (select value from string_split(@numbers,','))
AND day = @day
自定义行映射器:
public class CustomRowMapper implements RowMapper<CustomObject> {
private static final String SOMETHING = "something";
private static final String SOMETHING2 = "something2";
private static final String SOMETHING3 = "something3";
@Override
public CustomObject mapRow(ResultSet resultSet, int i) throws SQLException {
CustomObject customObject = new CustomObject();
customObject.setSomething(resultSet.getString(SOMETHING));
customObject.setSomething2(resultSet.getString(SOMETHING2));
customObject.setSomething3(resultSet.getInt(SOMETHING3));
return customObject;
}
}
执行存储过程并查询结果:
SimpleJdbcCall jdbcCall = new SimpleJdbcCall(jdbcTemplate)
.withProcedureName("storedProcName")
.returningResultSet("test", new CustomRowMapper());
Map<String, Object> out = jdbcCall.execute(parameterSource);
List<CustomObject> customObjects = (List<CustomObject>) out.get("test");
它工作正常,但必须有更有效的方法来做到这一点?但是我没有找到任何有用的东西。
there has to be a more efficient way to do this
Spring Batch 提供 StoredProcedureItemReader
可以调用给定的存储过程并迭代其结果。它还允许您使用您定义的自定义映射器。
根据您的代码片段,您调用该过程并获得一个 List<CustomObject>
,您需要在某个时候对其进行迭代。所以我认为带有 StoredProcedureItemReader<CustomObject>
的面向块的 tasklet 对你来说是一个不错的选择:
@Bean
public StoredProcedureItemReader<CustomObject> itemReader() {
return new StoredProcedureItemReaderBuilder<CustomObject>()
.procedureName("storedProcName")
.rowMapper(new CustomRowMapper())
// set other properties
.build();
}
编辑: 显示如何 return 同步 reader
@Bean
@StepScope
public SynchronizedItemStreamReader<CustomObject> itemReader() {
StoredProcedureItemReader<CustomObject> reader = new StoredProcedureItemReaderBuilder<>()
.procedureName("storedProcName")
.rowMapper(new CustomRowMapper())
// set other properties
.build();
SynchronizedItemStreamReader<CustomObject> synchronizedReader = new SynchronizedItemStreamReader<>();
synchronizedReader.setDelegate(reader);
return synchronizedReader;
}
我的目标是在 spring 批处理 tasklet 中使用自定义行映射器查询存储过程(sql 服务器)的结果。
我正在使用 Spring Boot(版本 2.2.2.RELEASE)和 Spring Batch(4.2.1.RELEASE)。
示例:
存储过程:
CREATE PROCEDURE storedProcName @numbers VARCHAR(max), @day DATE
AS
SET NOCOUNT ON;
SELECT something, something2, something3
FROM sometable
WHERE ids in (select value from string_split(@numbers,','))
AND day = @day
自定义行映射器:
public class CustomRowMapper implements RowMapper<CustomObject> {
private static final String SOMETHING = "something";
private static final String SOMETHING2 = "something2";
private static final String SOMETHING3 = "something3";
@Override
public CustomObject mapRow(ResultSet resultSet, int i) throws SQLException {
CustomObject customObject = new CustomObject();
customObject.setSomething(resultSet.getString(SOMETHING));
customObject.setSomething2(resultSet.getString(SOMETHING2));
customObject.setSomething3(resultSet.getInt(SOMETHING3));
return customObject;
}
}
执行存储过程并查询结果:
SimpleJdbcCall jdbcCall = new SimpleJdbcCall(jdbcTemplate)
.withProcedureName("storedProcName")
.returningResultSet("test", new CustomRowMapper());
Map<String, Object> out = jdbcCall.execute(parameterSource);
List<CustomObject> customObjects = (List<CustomObject>) out.get("test");
它工作正常,但必须有更有效的方法来做到这一点?但是我没有找到任何有用的东西。
there has to be a more efficient way to do this
Spring Batch 提供 StoredProcedureItemReader
可以调用给定的存储过程并迭代其结果。它还允许您使用您定义的自定义映射器。
根据您的代码片段,您调用该过程并获得一个 List<CustomObject>
,您需要在某个时候对其进行迭代。所以我认为带有 StoredProcedureItemReader<CustomObject>
的面向块的 tasklet 对你来说是一个不错的选择:
@Bean
public StoredProcedureItemReader<CustomObject> itemReader() {
return new StoredProcedureItemReaderBuilder<CustomObject>()
.procedureName("storedProcName")
.rowMapper(new CustomRowMapper())
// set other properties
.build();
}
编辑: 显示如何 return 同步 reader
@Bean
@StepScope
public SynchronizedItemStreamReader<CustomObject> itemReader() {
StoredProcedureItemReader<CustomObject> reader = new StoredProcedureItemReaderBuilder<>()
.procedureName("storedProcName")
.rowMapper(new CustomRowMapper())
// set other properties
.build();
SynchronizedItemStreamReader<CustomObject> synchronizedReader = new SynchronizedItemStreamReader<>();
synchronizedReader.setDelegate(reader);
return synchronizedReader;
}