Add Api endpoints for search functionality

Author: mullicode

backend/src/main/java/com/example/employeemanagement/controller/DepartmentController.java

@@ -34,6 +34,31 @@ public List<Department> getAllDepartments() {
     return departmentService.getAllDepartments();
   }
 
+  /**
+   * Search departments by name API.
+   *
+   * @param name The name or partial name to search for
+   * @return List of departments matching the search criteria
+   */
+  @Operation(
+      summary = "Search departments by name",
+      description = "Retrieve departments filtered by name (case-insensitive partial match)")
+  @ApiResponses(
+      value = {
+        @ApiResponse(responseCode = "200", description = "Departments found"),
+      })
+  @GetMapping("/search")
+  public List<Department> searchDepartments(
+      @Parameter(
+              description = "Name or partial name to search for (case-insensitive)",
+              example = "Engineering")
+      @RequestParam(name = "name", required = false) String name) {
+    if (name == null || name.trim().isEmpty()) {
+      return getAllDepartments();
+    }
+    return departmentService.searchDepartmentsByName(name.trim());
+  }
+
   /**
    * Get department by ID API.
    *

backend/src/main/java/com/example/employeemanagement/repository/DepartmentRepository.java

@@ -3,7 +3,10 @@
 import com.example.employeemanagement.model.Department;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
+import java.util.List;
 
 /** This interface represents a repository for departments. */
 @Repository
-public interface DepartmentRepository extends JpaRepository<Department, Long> {}
+public interface DepartmentRepository extends JpaRepository<Department, Long> {
+  List<Department> findByNameContainingIgnoreCase(String name);
+}

backend/src/main/java/com/example/employeemanagement/service/DepartmentService.java

@@ -23,6 +23,16 @@ public List<Department> getAllDepartments() {
     return departmentRepository.findAll();
   }
 
+  /**
+   * Search departments by name.
+   *
+   * @param name The name to search for (case-insensitive partial match)
+   * @return List of departments matching the search criteria
+   */
+  public List<Department> searchDepartmentsByName(String name) {
+    return departmentRepository.findByNameContainingIgnoreCase(name);
+  }
+
   /**
    * Get department by ID.
    *