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Stored Procedures

The JPA 2.1 specification introduced support for calling stored procedures by using the JPA criteria query API. We Introduced the @Procedure annotation for declaring stored procedure metadata on a repository method.

The examples to follow use the following stored procedure:

Example 1. The definition of the plus1inout procedure in HSQL DB.

/;
DROP procedure IF EXISTS plus1inout
/;
CREATE procedure plus1inout (IN arg int, OUT res int)
BEGIN ATOMIC
 set res = arg + 1;
END
/;

Metadata for stored procedures can be configured by using the NamedStoredProcedureQuery annotation on an entity type.

Example 2. StoredProcedure metadata definitions on an entity.

@Entity
@NamedStoredProcedureQuery(name = "User.plus1", procedureName = "plus1inout", parameters = {
  @StoredProcedureParameter(mode = ParameterMode.IN, name = "arg", type = Integer.class),
  @StoredProcedureParameter(mode = ParameterMode.OUT, name = "res", type = Integer.class) })
public class User {}

Note that @NamedStoredProcedureQuery has two different names for the stored procedure. name is the name JPA uses. procedureName is the name the stored procedure has in the database.

You can reference stored procedures from a repository method in multiple ways. The stored procedure to be called can either be defined directly by using the value or procedureName attribute of the @Procedure annotation. This refers directly to the stored procedure in the database and ignores any configuration via @NamedStoredProcedureQuery.

Alternatively you may specify the @NamedStoredProcedureQuery.name attribute as the @Procedure.name attribute. If neither value, procedureName nor name is configured, the name of the repository method is used as the name attribute.

The following example shows how to reference an explicitly mapped procedure:

Example 3. Referencing explicitly mapped procedure with name "plus1inout" in database.

@Procedure("plus1inout")
Integer explicitlyNamedPlus1inout(Integer arg);

The following example is equivalent to the previous one but uses the procedureName alias:

Example 4. Referencing implicitly mapped procedure with name "plus1inout" in database via procedureName alias.

@Procedure(procedureName = "plus1inout")
Integer callPlus1InOut(Integer arg);

The following is again equivalent to the previous two but using the method name instead of an explicit annotation attribute.

Example 5. Referencing implicitly mapped named stored procedure "User.plus1" in EntityManager by using the method name.

@Procedure
Integer plus1inout(@Param("arg") Integer arg);

The following example shows how to reference a stored procedure by referencing the @NamedStoredProcedureQuery.name attribute.

Example 6. Referencing explicitly mapped named stored procedure "User.plus1IO" in EntityManager.

@Procedure(name = "User.plus1IO")
Integer entityAnnotatedCustomNamedProcedurePlus1IO(@Param("arg") Integer arg);

If the stored procedure getting called has a single out parameter that parameter may be returned as the return value of the method. If there are multiple out parameters specified in a @NamedStoredProcedureQuery annotation those can be returned as a Map with the key being the parameter name given in the @NamedStoredProcedureQuery annotation.

Note that if the stored procedure returns a ResultSet then any OUT parameters are omitted as Java can only return a single method return value unless the method declares a Map return type.

The following example shows how to obtain multiple OUT parameters if the stored procedure has multiple OUT parameters and is registered as @NamedStoredProcedureQuery. @NamedStoredProcedureQuery registration is required to provide parameter metadata.

Example 7. StoredProcedure metadata definitions on an entity.

@Entity
@NamedStoredProcedureQuery(name = "User.multiple_out_parameters", procedureName = "multiple_out_parameters", parameters = {
  @StoredProcedureParameter(mode = ParameterMode.IN, name = "arg", type = Integer.class),
  @StoredProcedureParameter(mode = ParameterMode.REF_CURSOR, name = "some_cursor", type = void.class),
  @StoredProcedureParameter(mode = ParameterMode.OUT, name = "res", type = Integer.class) })
public class User {}

Example 8. Returning multiple OUT parameters

@Procedure(name = "User.multiple_out_parameters")
Map<String, Object> returnsMultipleOutParameters(@Param("arg") Integer arg);