Spring Boot H2 数据转换

Question

Spring Boot 版本：2.1.2.RELEASE

H2 版本：1.4.197

通过 JpaRepository 查询：

@Repository

public interface PlayerStorage extends JpaRepository<Player, Long> {

  List<Player> findByUid(@Param("uid") List<Integer> uid);

}

...

List<Player> foundByUids = playerStorage.findByUid(Arrays.asList(100, 200));

Spring 生成并执行查询：

Data conversion error converting "(100, 200)"; SQL statement:

select

        player0_.id as id1_3_,

        player0_.uid as uid3_3_ 

    from

        player player0_ 

    where

        player0_.uid=(100 , 200)

[22018-197]

...

Caused by: java.lang.NumberFormatException: For input string: "(100, 200)"

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)

at java.lang.Integer.parseInt(Integer.java:569)

at java.lang.Integer.parseInt(Integer.java:615)

at org.h2.value.Value.convertTo(Value.java:1061)

H2 说：

DATA_CONVERSION_ERROR_1 = 22018

The error with code 22018 is thrown when trying to convert a value to a data type where the conversion is undefined, or when an error occurred trying to convert.

Example:

CALL CAST(DATE '2001-01-01' AS BOOLEAN);

CALL CAST('CHF 99.95' AS INT);

如果我尝试直接从 H2 Web 控制台执行此查询，我会得到相同的结果。如果我做对了，问题就出在声明中：player0_.uid=(100 , 200). 与in 相同的查询player0_.uid in (100 , 200)可以从 Web 控制台正常执行。

我也有 H2 的弹簧靴属性：

spring.datasource.driver-class-name=org.h2.Driver

spring.jpa.database=H2

spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

Answer 1

错误可能在存储库代码中：public interface PlayerStorage extends JpaRepository<Player, Long> {&nbsp; List<Player> findByUid(@Param("uid") List<Integer> uid);}从文档中它应该是：public interface PlayerStorage extends JpaRepository<Player, Long> {&nbsp; List<Player> findByUidIn(@Param("uid") List<Integer> uid);}还：如果“uid”是 Player 中的字段，则不需要 @Param@Repository 也是多余的我建议添加一些验证，以确保传递给方法的列表不为空，否则会导致异常。

Answer 2

尝试将您的方法重命名为List<Player>&nbsp;findByUidIn(@Param("uids")&nbsp;List<Integer>&nbsp;uids);