问题描述
对于Spring Data JDBC，可以进行延迟加载吗？还是可以投影？
我只希望在数据中包含两个字段，但是似乎Spring JDBC正在获取整个字段。
@Repository
public interface AppUserRepo extends CrudRepository<AppUser,Long> {
@Query("select id,firstname,lastname from m_appuser where firstname=:firstName")
public AppUser findByAppUserName(@Param("firstName") String firstName);
}
这导致获取所有关联的对象。
org.springframework.jdbc.BadsqlGrammarException: PreparedStatementCallback; bad sql grammar [SELECT "ROLE"."ID" AS "ID","ROLE"."DEL" AS "DEL","ROLE"."NAME" AS "NAME","ROLE"."VERSION" AS "VERSION","ROLE"."disABLED" AS "disABLED","ROLE"."CREATED_DATE" AS "CREATED_DATE","ROLE"."DESCRIPTION" AS "DESCRIPTION","ROLE"."REFERENCE_NUMBER" AS "REFERENCE_NUMBER","ROLE"."LAST_MODIFIED_DATE" AS "LAST_MODIFIED_DATE","createdBy"."ID" AS "CREATEDBY_ID","createdBy"."DEL" AS "CREATEDBY_DEL","createdBy"."EMAIL" AS "CREATEDBY_EMAIL","createdBy"."STATUS" AS "CREATEDBY_STATUS","createdBy"."VERSION" AS "CREATEDBY_VERSION","createdBy"."ENABLED" AS "CREATEDBY_ENABLED","createdBy"."PASSWORD" AS "CREATEDBY_PASSWORD","createdBy"."USER_TYPE" AS "CREATEDBY_USER_TYPE","createdBy"."BRANCH_ID" AS "CREATEDBY_BRANCH_ID","createdBy"."USERNAME" AS "CREATEDBY_USERNAME","createdBy"."LASTNAME" AS "CREATEDBY_LASTNAME","createdBy"."FirsTNAME" AS "CREATEDBY_FirsTNAME","createdBy"."CLEAR_PSWD" AS "CREATEDBY_CLEAR_PSWD","createdBy"."MIDDLENAME" AS "CREATEDBY_MIDDLENAME","createdBy"."CREATED_DATE" AS "CREATEDBY_CREATED_DATE","createdBy"."Failed_LOGINS" AS "CREATEDBY_Failed_LOGINS","createdBy"."MOBILE_NUMBER" AS "CREATEDBY_MOBILE_NUMBER","createdBy"."LAST_LOGIN_DATE" AS "CREATEDBY_LAST_LOGIN_DATE","createdBy"."LAST_MODIFIED_DATE" AS "CREATEDBY_LAST_MODIFIED_DATE","createdBy"."ACCOUNT_NON_LOCKED" AS "CREATEDBY_ACCOUNT_NON_LOCKED","createdBy"."PROFILE_EXPIRY_DATE" AS "CREATEDBY_PROFILE_EXPIRY_DATE","createdBy"."IS_SELF_SERVICE_USER" AS "CREATEDBY_IS_SELF_SERVICE_USER","createdBy"."MOBILE_COUNTRY_CODE" AS "CREATEDBY_MOBILE_COUNTRY_CODE","createdBy"."ACCOUNT_NON_EXPIRED" AS "CREATEDBY_ACCOUNT_NON_EXPIRED","createdBy"."PASSWORD_NEVER_EXPIRES" AS "CREATEDBY_PASSWORD_NEVER_EXPIRES","createdBy"."CREDENTIALS_NON_EXPIRED" AS "CREATEDBY_CREDENTIALS_NON_EXPIRED","createdBy"."LAST_TIME_PASSWORD_UPDATED" AS "CREATEDBY_LAST_TIME_PASSWORD_UPDATED","createdBy"."FirsT_TIME_LOGIN_REMAINING" AS "CREATEDBY_FirsT_TIME_LOGIN_REMAINING","lastModifiedBy"."ID" AS "LASTMODIFIEDBY_ID","lastModifiedBy"."DEL" AS "LASTMODIFIEDBY_DEL","lastModifiedBy"."EMAIL" AS "LASTMODIFIEDBY_EMAIL","lastModifiedBy"."STATUS" AS "LASTMODIFIEDBY_STATUS","lastModifiedBy"."VERSION" AS "LASTMODIFIEDBY_VERSION","lastModifiedBy"."ENABLED" AS "LASTMODIFIEDBY_ENABLED","lastModifiedBy"."USERNAME" AS "LASTMODIFIEDBY_USERNAME","lastModifiedBy"."BRANCH_ID" AS "LASTMODIFIEDBY_BRANCH_ID","lastModifiedBy"."PASSWORD" AS "LASTMODIFIEDBY_PASSWORD","lastModifiedBy"."LASTNAME" AS "LASTMODIFIEDBY_LASTNAME","lastModifiedBy"."USER_TYPE" AS "LASTMODIFIEDBY_USER_TYPE","lastModifiedBy"."CLEAR_PSWD" AS "LASTMODIFIEDBY_CLEAR_PSWD","lastModifiedBy"."FirsTNAME" AS "LASTMODIFIEDBY_FirsTNAME","lastModifiedBy"."MIDDLENAME" AS "LASTMODIFIEDBY_MIDDLENAME","lastModifiedBy"."CREATED_DATE" AS "LASTMODIFIEDBY_CREATED_DATE","lastModifiedBy"."Failed_LOGINS" AS "LASTMODIFIEDBY_Failed_LOGINS","lastModifiedBy"."MOBILE_NUMBER" AS "LASTMODIFIEDBY_MOBILE_NUMBER","lastModifiedBy"."LAST_LOGIN_DATE" AS "LASTMODIFIEDBY_LAST_LOGIN_DATE","lastModifiedBy"."ACCOUNT_NON_LOCKED" AS "LASTMODIFIEDBY_ACCOUNT_NON_LOCKED","lastModifiedBy"."LAST_MODIFIED_DATE" AS "LASTMODIFIEDBY_LAST_MODIFIED_DATE","lastModifiedBy"."MOBILE_COUNTRY_CODE" AS "LASTMODIFIEDBY_MOBILE_COUNTRY_CODE","lastModifiedBy"."PROFILE_EXPIRY_DATE" AS "LASTMODIFIEDBY_PROFILE_EXPIRY_DATE","lastModifiedBy"."ACCOUNT_NON_EXPIRED" AS "LASTMODIFIEDBY_ACCOUNT_NON_EXPIRED","lastModifiedBy"."IS_SELF_SERVICE_USER" AS "LASTMODIFIEDBY_IS_SELF_SERVICE_USER","lastModifiedBy"."PASSWORD_NEVER_EXPIRES" AS "LASTMODIFIEDBY_PASSWORD_NEVER_EXPIRES","lastModifiedBy"."CREDENTIALS_NON_EXPIRED" AS "LASTMODIFIEDBY_CREDENTIALS_NON_EXPIRED","lastModifiedBy"."FirsT_TIME_LOGIN_REMAINING" AS "LASTMODIFIEDBY_FirsT_TIME_LOGIN_REMAINING","lastModifiedBy"."LAST_TIME_PASSWORD_UPDATED" AS "LASTMODIFIEDBY_LAST_TIME_PASSWORD_UPDATED","createdBy_staff"."ID" AS "CREATEDBY_STAFF_ID","createdBy_staff"."ACTIVE" AS "CREATEDBY_STAFF_ACTIVE","createdBy_staff"."MOBILE_NO" AS "CREATEDBY_STAFF_MOBILE_NO","createdBy_staff"."LASTNAME" AS "CREATEDBY_STAFF_LASTNAME","createdBy_staff"."FirsTNAME" AS "CREATEDBY_STAFF_FirsTNAME","createdBy_staff"."EXTERNAL_ID" AS "CREATEDBY_STAFF_EXTERNAL_ID","createdBy_staff"."LOAN_OFFICER" AS "CREATEDBY_STAFF_LOAN_OFFICER","createdBy_staff"."disPLAY_NAME" AS "CREATEDBY_STAFF_disPLAY_NAME","createdBy_staff"."JOINING_DATE" AS "CREATEDBY_STAFF_JOINING_DATE","createdBy_staff"."EMAIL_ADDRESS" AS "CREATEDBY_STAFF_EMAIL_ADDRESS","createdBy_staff"."ORGANISATIONAL_ROLE_TYPE" AS "CREATEDBY_STAFF_ORGANISATIONAL_ROLE_TYPE","createdBy_office"."ID" AS "CREATEDBY_OFFICE_ID","createdBy_office"."NAME" AS "CREATEDBY_OFFICE_NAME","createdBy_office"."HIERARCHY" AS "CREATEDBY_OFFICE_HIERARCHY","createdBy_office"."EXTERNAL_ID" AS "CREATEDBY_OFFICE_EXTERNAL_ID","createdBy_office"."opening_DATE" AS "CREATEDBY_OFFICE_opening_DATE","createdBy_tellerId"."ID" AS "CREATEDBY_TELLERID_ID","createdBy_tellerId"."DEL" AS "CREATEDBY_TELLERID_DEL","createdBy_tellerId"."NAME" AS "CREATEDBY_TELLERID_NAME","createdBy_tellerId"."VERSION" AS "CREATEDBY_TELLERID_VERSION","createdBy_tellerId"."TELLER_CODE" AS "CREATEDBY_TELLERID_TELLER_CODE","createdBy_tellerId"."DESCRIPTION" AS "CREATEDBY_TELLERID_DESCRIPTION","createdBy_tellerId"."CREATED_DATE" AS "CREATEDBY_TELLERID_CREATED_DATE","createdBy_tellerId"."LAST_MODIFIED_DATE" AS "CREATEDBY_TELLERID_LAST_MODIFIED_DATE","createdBy_departmentId"."ID" AS "CREATEDBY_DEPARTMENTID_ID","createdBy_departmentId"."DEL" AS "CREATEDBY_DEPARTMENTID_DEL","createdBy_departmentId"."VERSION" AS "CREATEDBY_DEPARTMENTID_VERSION","createdBy_departmentId"."CREATED_DATE" AS "CREATEDBY_DEPARTMENTID_CREATED_DATE","createdBy_departmentId"."DEPARTMENT_NAME" AS "CREATEDBY_DEPARTMENTID_DEPARTMENT_NAME","createdBy_departmentId"."DEPARTMENT_CODE" AS "CREATEDBY_DEPARTMENTID_DEPARTMENT_CODE","createdBy_departmentId"."REFERENCE_NUMBER" AS "CREATEDBY_DEPARTMENTID_REFERENCE_NUMBER","createdBy_departmentId"."LAST_MODIFIED_DATE" AS "CREATEDBY_DEPARTMENTID_LAST_MODIFIED_DATE","lastModifiedBy_staff"."ID" AS "LASTMODIFIEDBY_STAFF_ID","lastModifiedBy_staff"."ACTIVE" AS "LASTMODIFIEDBY_STAFF_ACTIVE","lastModifiedBy_staff"."MOBILE_NO" AS "LASTMODIFIEDBY_STAFF_MOBILE_NO","lastModifiedBy_staff"."LASTNAME" AS "LASTMODIFIEDBY_STAFF_LASTNAME","lastModifiedBy_staff"."FirsTNAME" AS "LASTMODIFIEDBY_STAFF_FirsTNAME","lastModifiedBy_staff"."EXTERNAL_ID" AS "LASTMODIFIEDBY_STAFF_EXTERNAL_ID","lastModifiedBy_staff"."disPLAY_NAME" AS "LASTMODIFIEDBY_STAFF_disPLAY_NAME","lastModifiedBy_staff"."LOAN_OFFICER" AS "LASTMODIFIEDBY_STAFF_LOAN_OFFICER","lastModifiedBy_staff"."JOINING_DATE" AS "LASTMODIFIEDBY_STAFF_JOINING_DATE","lastModifiedBy_staff"."EMAIL_ADDRESS" AS "LASTMODIFIEDBY_STAFF_EMAIL_ADDRESS","lastModifiedBy_staff"."ORGANISATIONAL_ROLE_TYPE" AS "LASTMODIFIEDBY_STAFF_ORGANISATIONAL_ROLE_TYPE","lastModifiedBy_office"."ID" AS "LASTMODIFIEDBY_OFFICE_ID","lastModifiedBy_office"."NAME" AS "LASTMODIFIEDBY_OFFICE_NAME","lastModifiedBy_office"."HIERARCHY" AS "LASTMODIFIEDBY_OFFICE_HIERARCHY","lastModifiedBy_office"."EXTERNAL_ID" AS "LASTMODIFIEDBY_OFFICE_EXTERNAL_ID","lastModifiedBy_office"."opening_DATE" AS "LASTMODIFIEDBY_OFFICE_opening_DATE","lastModifiedBy_tellerId"."ID" AS "LASTMODIFIEDBY_TELLERID_ID","lastModifiedBy_tellerId"."DEL" AS "LASTMODIFIEDBY_TELLERID_DEL","lastModifiedBy_tellerId"."NAME" AS "LASTMODIFIEDBY_TELLERID_NAME","lastModifiedBy_tellerId"."VERSION" AS "LASTMODIFIEDBY_TELLERID_VERSION","lastModifiedBy_tellerId"."TELLER_CODE" AS "LASTMODIFIEDBY_TELLERID_TELLER_CODE","lastModifiedBy_tellerId"."CREATED_DATE" AS "LASTMODIFIEDBY_TELLERID_CREATED_DATE","lastModifiedBy_tellerId"."DESCRIPTION" AS "LASTMODIFIEDBY_TELLERID_DESCRIPTION","lastModifiedBy_tellerId"."LAST_MODIFIED_DATE" AS "LASTMODIFIEDBY_TELLERID_LAST_MODIFIED_DATE","lastModifiedBy_departmentId"."ID" AS "LASTMODIFIEDBY_DEPARTMENTID_ID","lastModifiedBy_departmentId"."DEL" AS "LASTMODIFIEDBY_DEPARTMENTID_DEL","lastModifiedBy_departmentId"."VERSION" AS "LASTMODIFIEDBY_DEPARTMENTID_VERSION","lastModifiedBy_departmentId"."CREATED_DATE" AS "LASTMODIFIEDBY_DEPARTMENTID_CREATED_DATE","lastModifiedBy_departmentId"."DEPARTMENT_CODE" AS "LASTMODIFIEDBY_DEPARTMENTID_DEPARTMENT_CODE","lastModifiedBy_departmentId"."DEPARTMENT_NAME" AS "LASTMODIFIEDBY_DEPARTMENTID_DEPARTMENT_NAME","lastModifiedBy_departmentId"."REFERENCE_NUMBER" AS "LASTMODIFIEDBY_DEPARTMENTID_REFERENCE_NUMBER","lastModifiedBy_departmentId"."LAST_MODIFIED_DATE" AS "LASTMODIFIEDBY_DEPARTMENTID_LAST_MODIFIED_DATE","createdBy_staff_image"."ID" AS "CREATEDBY_STAFF_IMAGE_ID","createdBy_staff_image"."LOCATION" AS "CREATEDBY_STAFF_IMAGE_LOCATION","createdBy_staff_image"."STORAGE_TYPE" AS "CREATEDBY_STAFF_IMAGE_STORAGE_TYPE","createdBy_staff_office"."ID" AS "CREATEDBY_STAFF_OFFICE_ID","createdBy_staff_office"."NAME" AS "CREATEDBY_STAFF_OFFICE_NAME","createdBy_staff_office"."HIERARCHY" AS "CREATEDBY_STAFF_OFFICE_HIERARCHY","createdBy_staff_office"."EXTERNAL_ID" AS "CREATEDBY_STAFF_OFFICE_EXTERNAL_ID","createdBy_staff_office"."opening_DATE" AS "CREATEDBY_STAFF_OFFICE_opening_DATE","createdBy_departmentId_branch"."ID" AS "CREATEDBY_DEPARTMENTID_BRANCH_ID","createdBy_departmentId_branch"."NAME" AS "CREATEDBY_DEPARTMENTID_BRANCH_NAME","createdBy_departmentId_branch"."HIERARCHY" AS "CREATEDBY_DEPARTMENTID_BRANCH_HIERARCHY","createdBy_departmentId_branch"."EXTERNAL_ID" AS "CREATEDBY_DEPARTMENTID_BRANCH_EXTERNAL_ID","createdBy_departmentId_branch"."opening_DATE" AS "CREATEDBY_DEPARTMENTID_BRANCH_opening_DATE","createdBy_departmentId_sourcePlaceCode"."ID" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_ID","createdBy_departmentId_sourcePlaceCode"."LABEL" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_LABEL","createdBy_departmentId_sourcePlaceCode"."POSITION" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_POSITION","createdBy_departmentId_sourcePlaceCode"."IS_ACTIVE" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_IS_ACTIVE","createdBy_departmentId_sourcePlaceCode"."MANDATORY" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_MANDATORY","createdBy_departmentId_sourcePlaceCode"."DESCRIPTION" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_DESCRIPTION","lastModifiedBy_staff_image"."ID" AS "LASTMODIFIEDBY_STAFF_IMAGE_ID","lastModifiedBy_staff_image"."LOCATION" AS "LASTMODIFIEDBY_STAFF_IMAGE_LOCATION","lastModifiedBy_staff_image"."STORAGE_TYPE" AS "LASTMODIFIEDBY_STAFF_IMAGE_STORAGE_TYPE","lastModifiedBy_staff_office"."ID" AS "LASTMODIFIEDBY_STAFF_OFFICE_ID","lastModifiedBy_staff_office"."NAME" AS "LASTMODIFIEDBY_STAFF_OFFICE_NAME","lastModifiedBy_staff_office"."HIERARCHY" AS "LASTMODIFIEDBY_STAFF_OFFICE_HIERARCHY","lastModifiedBy_staff_office"."EXTERNAL_ID" AS "LASTMODIFIEDBY_STAFF_OFFICE_EXTERNAL_ID","lastModifiedBy_staff_office"."opening_DATE" AS "LASTMODIFIEDBY_STAFF_OFFICE_opening_DATE","lastModifiedBy_departmentId_branch"."ID" AS "LASTMODIFIEDBY_DEPARTMENTID_BRANCH_ID","lastModifiedBy_departmentId_branch"."NAME" AS "LASTMODIFIEDBY_DEPARTMENTID_BRANCH_NAME","lastModifiedBy_departmentId_branch"."HIERARCHY" AS "LASTMODIFIEDBY_DEPARTMENTID_BRANCH_HIERARCHY","lastModifiedBy_departmentId_branch"."EXTERNAL_ID" AS "LASTMODIFIEDBY_DEPARTMENTID_BRANCH_EXTERNAL_ID","lastModifiedBy_departmentId_branch"."opening_DATE" AS "LASTMODIFIEDBY_DEPARTMENTID_BRANCH_opening_DATE","lastModifiedBy_departmentId_sourcePlaceCode"."ID" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_ID","lastModifiedBy_departmentId_sourcePlaceCode"."LABEL" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_LABEL","lastModifiedBy_departmentId_sourcePlaceCode"."POSITION" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_POSITION","lastModifiedBy_departmentId_sourcePlaceCode"."IS_ACTIVE" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_IS_ACTIVE","lastModifiedBy_departmentId_sourcePlaceCode"."MANDATORY" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_MANDATORY","lastModifiedBy_departmentId_sourcePlaceCode"."DESCRIPTION" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_DESCRIPTION","createdBy_departmentId_sourcePlaceCode_code"."ID" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_CODE_ID","createdBy_departmentId_sourcePlaceCode_code"."NAME" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_CODE_NAME","createdBy_departmentId_sourcePlaceCode_code"."SYstem_DEFINED" AS "CREATEDBY_DEPARTMENTID_SOURCEPLACECODE_CODE_SYstem_DEFINED","lastModifiedBy_departmentId_sourcePlaceCode_code"."ID" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_CODE_ID","lastModifiedBy_departmentId_sourcePlaceCode_code"."NAME" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_CODE_NAME","lastModifiedBy_departmentId_sourcePlaceCode_code"."SYstem_DEFINED" AS "LASTMODIFIEDBY_DEPARTMENTID_SOURCEPLACECODE_CODE_SYstem_DEFINED" FROM "ROLE" LEFT OUTER JOIN "APP_USER" AS "createdBy" ON "createdBy"."ROLE" = "ROLE"."ID" LEFT OUTER JOIN "APP_USER" AS "lastModifiedBy" ON "lastModifiedBy"."ROLE" = "ROLE"."ID" LEFT OUTER JOIN "STAFF" AS "createdBy_staff" ON "createdBy_staff"."APP_USER" = "createdBy"."ID" LEFT OUTER JOIN "OFFICE" AS "createdBy_office" ON "createdBy_office"."APP_USER" = "createdBy"."ID" LEFT OUTER JOIN "TELLER" AS "createdBy_tellerId" ON "createdBy_tellerId"."APP_USER" = "createdBy"."ID" LEFT OUTER JOIN "DEPARTMENT" AS "createdBy_departmentId" ON "createdBy_departmentId"."APP_USER" = "createdBy"."ID" LEFT OUTER JOIN "STAFF" AS "lastModifiedBy_staff" ON "lastModifiedBy_staff"."APP_USER" = "lastModifiedBy"."ID" LEFT OUTER JOIN "OFFICE" AS "lastModifiedBy_office" ON "lastModifiedBy_office"."APP_USER" = "lastModifiedBy"."ID" LEFT OUTER JOIN "TELLER" AS "lastModifiedBy_tellerId" ON "lastModifiedBy_tellerId"."APP_USER" = "lastModifiedBy"."ID" LEFT OUTER JOIN "DEPARTMENT" AS "lastModifiedBy_departmentId" ON "lastModifiedBy_departmentId"."APP_USER" = "lastModifiedBy"."ID" LEFT OUTER JOIN "IMAGE" AS "createdBy_staff_image" ON "createdBy_staff_image"."STAFF" = "createdBy_staff"."ID" LEFT OUTER JOIN "OFFICE" AS "createdBy_staff_office" ON "createdBy_staff_office"."STAFF" = "createdBy_staff"."ID" LEFT OUTER JOIN "OFFICE" AS "createdBy_departmentId_branch" ON "createdBy_departmentId_branch"."DEPARTMENT" = "createdBy_departmentId"."ID" LEFT OUTER JOIN "CODE_VALUE" AS "createdBy_departmentId_sourcePlaceCode" ON "createdBy_departmentId_sourcePlaceCode"."DEPARTMENT" = "createdBy_departmentId"."ID" LEFT OUTER JOIN "IMAGE" AS "lastModifiedBy_staff_image" ON "lastModifiedBy_staff_image"."STAFF" = "lastModifiedBy_staff"."ID" LEFT OUTER JOIN "OFFICE" AS "lastModifiedBy_staff_office" ON "lastModifiedBy_staff_office"."STAFF" = "lastModifiedBy_staff"."ID" LEFT OUTER JOIN "OFFICE" AS "lastModifiedBy_departmentId_branch" ON "lastModifiedBy_departmentId_branch"."DEPARTMENT" = "lastModifiedBy_departmentId"."ID" LEFT OUTER JOIN "CODE_VALUE" AS "lastModifiedBy_departmentId_sourcePlaceCode" ON "lastModifiedBy_departmentId_sourcePlaceCode"."DEPARTMENT" = "lastModifiedBy_departmentId"."ID" LEFT OUTER JOIN "CODE" AS "createdBy_departmentId_sourcePlaceCode_code" ON "createdBy_departmentId_sourcePlaceCode_code"."CODE_VALUE" = "createdBy_departmentId_sourcePlaceCode"."ID" LEFT OUTER JOIN "CODE" AS "lastModifiedBy_departmentId_sourcePlaceCode_code" ON "lastModifiedBy_departmentId_sourcePlaceCode_code"."CODE_VALUE" = "lastModifiedBy_departmentId_sourcePlaceCode"."ID" WHERE "ROLE"."APP_USER" = ?]; nested exception is com.ibm.db2.jcc.am.sqlSyntaxErrorException: DB2 sql Error: sqlCODE=-204,sqlSTATE=42704,sqlERRMC=DB2INST1.ROLE,DRIVER=4.21.29
解决方法
一般原则。
Spring Data JDBC中没有延迟加载的概念。 这可能是Spring Data JDBC中最重要的设计决策，理解它至关重要：
Spring Data JDBC将加载一个完整的聚合，包括普通Java引用所引用的所有内容。不应或不能成为同一聚合的一部分的内容，不能由Java引用引用，而只能由id引用。有关此内容的详细讨论，请参见Spring Data JDBC,References,and Aggregates。
目前尚不支持使用其他Spring Data模块通过接口作为返回值来进行投影的方式，但是您可以使用DTO，即具有实体类属性子集的专用类，例如返回值。
您的情况是什么
AppUser似乎引用了Role，该引用由单独的select语句加载，这就是您所看到的。此选择不受注释中查询的控制。相反，AppUser实例由指定查询的结果初始化。然后，Spring Data JDBC注意到还有更多引用，并通过上述SQL语句解析了这些引用。
我不知道你为什么要例外。可能是因为查询时间长吗？
您应该做什么
创建一个仅包含查询中字段的新类AppUserProjection，并将其作为您的返回值。由于没有引用Role或其他引用，因此不会再执行任何SQL语句。
尽管更好或更重要，但我认为您的域模型不适合与Spring Data JDBC一起使用。 AppUser和Role似乎是两个不同的集合，因此一个必须通过ID引用另一个。这使得延迟加载项目立即消失。要从AppUser导航到Role，请使用ID从单独的Role加载RoleRepository。这甚至允许您实施所需的任何缓存策略。
除了引用之外，您还可以从不加载所有属性的SQL查询中填充实体。未在SQL中反映的所有属性都不会在实体上设置，因此将具有各自的默认值。 但是不建议这样做，因为它会创建不完整的实体，并且实体类中的任何代码都需要处理可能丢失的值，这会使代码变得复杂。如上所述，请改用专用的DTO。