了解 mbatis association的应用，和级联查询有不同

ssm-crud/src/main/java/com/atguigu/crud/bean/Employee.java

@@ -11,7 +11,27 @@ public class Employee {
 
     private Integer dId;
 
-    public Integer getEmpId() {
+    //查询员工的同时，部门信息也是查询好的
+    private Department department;
+
+
+
+
+    /**
+	 * @return the department
+	 */
+	public Department getDepartment() {
+		return department;
+	}
+
+	/**
+	 * @param department the department to set
+	 */
+	public void setDepartment(Department department) {
+		this.department = department;
+	}
+
+	public Integer getEmpId() {
         return empId;
     }
 

ssm-crud/src/main/java/com/atguigu/crud/dao/EmployeeMapper.java

@@ -19,6 +19,14 @@ public interface EmployeeMapper {
     List<Employee> selectByExample(EmployeeExample example);
 
     Employee selectByPrimaryKey(Integer empId);
+
+
+    List<Employee> selectByExampleWithDept(EmployeeExample example);
+
+    Employee selectByPrimaryKeyWithDept(Integer empId);
+
+
+
 
     int updateByExampleSelective(@Param("record") Employee record, @Param("example") EmployeeExample example);