feat: 增加本地查询示例

src/test/java/com/lanyuanxiaoyao/service/template/TestApplication.java

@@ -231,6 +231,24 @@ public class TestApplication {
     System.exit(0);
   }
 
+  @EventListener(ApplicationReadyEvent.class)
+  public void runNativeQueryTests() throws JsonProcessingException {
+    // 增
+    var cid1 = saveItem("company", "{\"name\": \"Apple\",\"members\": 10}").get("data").asLong();
+    var cid2 = saveItem("company", "{\"name\": \"Banana\",\"members\": 20}").get("data").asLong();
+    var cid3 = saveItem("company", "{\"name\": \"Cheery\",\"members\": 20}").get("data").asLong();
+    var eid1 = saveItem("employee", "{\"name\": \"Tom\",\"age\": 18, \"companyId\": %d}".formatted(cid1)).get("data").asLong();
+    var eid2 = saveItem("employee", "{\"name\": \"Jerry\",\"age\": 18, \"companyId\": %d}".formatted(cid1)).get("data").asLong();
+    var eid3 = saveItem("employee", "{\"name\": \"Mike\",\"age\": 18, \"companyId\": %d}".formatted(cid2)).get("data").asLong();
+
+    var list = employeeRepository.findAllEmployeeWithCompanyName();
+    Assert.isTrue(list.size() == 3, "数量错误");
+    log.debug("Results: {}", list);
+    var list_native = employeeRepository.findAllEmployeeWithCompanyNameNative();
+    Assert.isTrue(list_native.size() == 3, "数量错误");
+    log.debug("Results: {}", list_native);
+  }
+
   private HttpHeaders headers() {
     var headers = new HttpHeaders();
     headers.setContentType(MediaType.APPLICATION_JSON);

src/test/java/com/lanyuanxiaoyao/service/template/entity/Employee.java

@@ -12,8 +12,6 @@ import jakarta.persistence.JoinColumn;
 import jakarta.persistence.JoinTable;
 import jakarta.persistence.ManyToOne;
 import jakarta.persistence.MapKeyEnumerated;
-import jakarta.persistence.NamedAttributeNode;
-import jakarta.persistence.NamedEntityGraph;
 import java.util.HashMap;
 import java.util.Map;
 import lombok.Getter;
@@ -35,9 +33,6 @@ import org.springframework.data.jpa.domain.support.AuditingEntityListener;
 @DynamicUpdate
 @DynamicInsert
 @EntityListeners(AuditingEntityListener.class)
-@NamedEntityGraph(name = "employee.detail", attributeNodes = {
-    @NamedAttributeNode("company")
-})
 @Comment("员工")
 public class Employee extends SimpleEntity {
   @Column(nullable = false)

src/test/java/com/lanyuanxiaoyao/service/template/entity/vo/EmployeeWithCompanyName.java

@@ -0,0 +1,11 @@
+package com.lanyuanxiaoyao.service.template.entity.vo;
+
+import com.lanyuanxiaoyao.service.template.entity.Employee;
+
+public record EmployeeWithCompanyName(
+    String name,
+    String companyName,
+    Integer age,
+    Employee.Role role
+) {
+}

src/test/java/com/lanyuanxiaoyao/service/template/repository/EmployeeRepository.java

@@ -1,15 +1,25 @@
 package com.lanyuanxiaoyao.service.template.repository;
 
 import com.lanyuanxiaoyao.service.template.entity.Employee;
+import com.lanyuanxiaoyao.service.template.entity.vo.EmployeeWithCompanyName;
+import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import org.springframework.data.jpa.domain.Specification;
 import org.springframework.data.jpa.repository.EntityGraph;
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
 
 @SuppressWarnings("NullableProblems")
 @Repository
 public interface EmployeeRepository extends SimpleRepository<Employee> {
-  @EntityGraph(value = "employee.detail", type = EntityGraph.EntityGraphType.FETCH)
+  @EntityGraph(attributePaths = {"company"})
   @Override
   Optional<Employee> findOne(Specification<Employee> specification);
+
+  @Query(value = "select e.name, c.name, e.age, e.role from employee e, company c where e.company_id = c.id", nativeQuery = true)
+  List<Map<String, Object>> findAllEmployeeWithCompanyNameNative();
+
+  @Query("select new com.lanyuanxiaoyao.service.template.entity.vo.EmployeeWithCompanyName(employee.name, employee.company.name, employee.age, employee.role) from Employee employee")
+  List<EmployeeWithCompanyName> findAllEmployeeWithCompanyName();
 }