如何在不带撇号的情况下将String参数传递给@Query

Question

What I need is to pass the mysql schema as a parameter into the @Query, as the example shows:

@Query
(value = " SELECT id, name FROM " + schema + ".constructions "
,nativeQuery = true)
List<Object> findAllConstructions(String schema);

but this code doesn't work because "schema cannot be resolved to a variable".

The problem is that when I try to pass the parameter correctly, like this:

@Query
(value = " SELECT id, name FROM ?.constructions "
,nativeQuery = true)
List<Object> findAllConstructions(String schema);

or this:

@Query
(value = " SELECT id, name FROM :schema .constructions "
,nativeQuery = true)
List<Object> findAllConstructions(@Param("schema") String schema);

the SQL generated has syntax errors, because the FROM clause looks like this:

FROM 'db_schema'.constructions

when it should be:

FROM db_schema.constructions

Could anyone help me?

---

EDIT 1 : I couldn't find any way (in MySQL) to SELECT a specific schema name as this question suggests for table names.

EDIT 2 : I solved my issue by creating an alternative connection and setting a statement like this:

ResultSet rs = connection.createStatement().executeQuery(" SELECT id, name FROM " 
+ schema + ".constructions ");

I'll leave the question open because my solution doesn't really answer the question, so if anyone finds an answer for the question, it's still open.

Answer 1

尝试使用表达语言

@Query(value = " SELECT id, name FROM #{#schema}.constructions " ,nativeQuery = true)