Spring Data JDBC@Modifying with PostgreSQL RETURNING从修改后的行返回

Question

PostgreSQL提供了一种从DML语句返回数据的简洁方法，请参阅https://www.postgresql.org/docs/current/dml-returning.html

我试图实现的是类似于下面的剪切

@Modifying
@Query("DELETE FROM Book b WHERE b.title = :title RETURNING *")
Book deleteReturning(@Param("title") String title);

以检索已删除的行。然而，这导致以下异常

org.springframework.dao.DataIntegrityViolationException: PreparedStatementCallback; SQL [DELETE FROM Book b WHERE b.title = ? RETURNING *]; A result was returned when none was expected.; nested exception is org.postgresql.util.PSQLException: A result was returned when none was expected.
at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.doTranslate(SQLStateSQLExceptionTranslator.java:104)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)
at org.springframework.jdbc.core.JdbcTemplate.translateException(JdbcTemplate.java:1443)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:633)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:862)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:883)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.update(NamedParameterJdbcTemplate.java:321)
at org.springframework.data.jdbc.repository.query.AbstractJdbcQuery.lambda$createModifyingQueryExecutor$0(AbstractJdbcQuery.java:103)
at org.springframework.data.jdbc.repository.query.StringBasedJdbcQuery.execute(StringBasedJdbcQuery.java:85)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor$QueryMethodInvoker.invoke(QueryExecutorMethodInterceptor.java:195)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:152)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:130)
...
Caused by: org.postgresql.util.PSQLException: A result was returned when none was expected.
at org.postgresql.jdbc.PgStatement.checkNoResultUpdate(PgStatement.java:269)
at org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:131)
at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61)
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java)
at org.springframework.jdbc.core.JdbcTemplate.lambda$update$0(JdbcTemplate.java:867)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:617)
... 95 more

Spring Data JDBC声明修改查询只能返回void、int和boolean，请参阅https://docs.spring.io/spring-data/jdbc/docs/current/reference/html/#jdbc.query-方法.at-query.修改

添加自定义RowMapper会导致相同的异常。

public class BookRowMapper<T> implements RowMapper<Book> {
@Override
public Book mapRow(final ResultSet rs, final int rowNum) throws SQLException {
return new Book(rs.getString(1), ...);
}
}
@Modifying
@Query(value = "delete from Book b where b.title = :title returning *", rowMapperClass = BookRowMapper.class)
Book deleteReturning(@Param("title") String title);

有实现这一目标的选择吗？

编辑：我知道普通JDBChttps://stackoverflow.com/a/40787385/1239904但我想走春天的路。

Answer 1

当您用@Modifying注释方法时，它被执行为一个DML语句，除了更新的行数之外，它不返回任何值。

如果您的语句返回ResultSet，则不应使用@Modifying，因此SpringDataJDBC尝试提取ResultSet并从中为方法创建返回值。