我正在尝试调用我在 Postgres 数据库中定义的函数。
CREATE OR REPLACE FUNCTION bacon()
RETURNS text AS
$BODY$
SELECT cast('ingeborg' as text)
$BODY$
LANGUAGE sql STABLE;
ALTER FUNCTION bacon()
OWNER TO my_user;
在我的 Spring 存储库中,我尝试调用该函数
@Repository
public class ItemRepository {
@PersistenceContext(name = "com.project.persistenceUnit")
private EntityManager entityManager;
public Collection<ItemView> findBy() {
String statement = "SELECT * FROM schema.bacon()";
String result = (String) entityManager.createNativeQuery(statement)
.getSingleResult();
}
}
当我尝试从存储库中获取数据时出现以下错误
11.04.2014 11:34:00.177 [main] WARN o.h.e.jdbc.spi.SqlExceptionHelper:144 @ SQL Error: 0, SQLState: 42883
11.04.2014 11:34:00.177 [main] ERROR o.h.e.jdbc.spi.SqlExceptionHelper:146 @ ERROR: Function schema.bacon() does not exist
SQLState 42883 是“undefined_function”(http://www.postgresql.org/docs/9.3/static/errcodes-appendix.html)
该函数在 pgAdmin 中调用时有效。
我做错了什么?如何调用定义的函数?
更新
我连接到错误的数据库,必须遵循以下 post :
public class MyExtendedPostgresSQLDialect extends PostgreSQL9Dialect {
public MyExtendedPostgresSQLDialect() {
super();
registerFunction("bacon", new PostgresBacon());
}
}
public class PostgresBacon implements SQLFunction {
@Override
public boolean hasArguments() {
return false;
}
@Override
public boolean hasParenthesesIfNoArguments() {
return false;
}
@Override
public Type getReturnType(Type firstArgumentType, Mapping mapping) throws QueryException {
return TextType.INSTANCE;
}
@Override
public String render(Type firstArgumentType, List arguments, SessionFactoryImplementor factory) throws QueryException {
return "bacon()";
}
}
最佳答案
我认为当您创建函数和调用函数时,您的 search_path 设置不相等。 对于 exp :
digoal=# show search_path;
search_path
----------------
"$user",public
(1 row)
digoal=# \c digoal digoal
You are now connected to database "digoal" as user "digoal".
digoal=> create function f_test1() returns void as $$
digoal$> declare
digoal$> begin
digoal$> end;
digoal$> $$ language plpgsql;
CREATE FUNCTION
digoal=> select f_test1();
f_test1
---------
(1 row)
digoal=> \c digoal postgres
You are now connected to database "digoal" as user "postgres".
digoal=# select f_test1();
ERROR: function f_test1() does not exist
LINE 1: select f_test1();
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
digoal=# \dn
List of schemas
Name | Owner
--------+----------
digoal | postgres
public | postgres
(2 rows)
digoal=# \df digoal.f_test1
List of functions
Schema | Name | Result data type | Argument data types | Type
--------+---------+------------------+---------------------+--------
digoal | f_test1 | void | | normal
(1 row)
digoal=# \df public.f_test1
List of functions
Schema | Name | Result data type | Argument data types | Type
--------+------+------------------+---------------------+------
(0 rows)
关于java - 在 JPA 存储库中调用 (Postgres) 函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23011452/