MyBatisPlus條件構造器帶條件排序方法orderBy、orderByDesc、orderByAsc使用

原文鏈接：https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/89526925

實現
排序前數據庫

orderBy()方法
默認升序。

/***
  *條件構造器 排序操作
  */
 @Test
 public void testEntitymapperOrderBy() {
  
  List<Employee> employeeList=employeeMapper.selectList(new EntityWrapper<Employee>()
    .eq("gender",1)
    .like("name", "霸")
    .orderBy("age")
    );
  System.out.println("*******************"+employeeList);
  for (Employee employee : employeeList) {
   System.out.println(employee.getAge());
  }
 }

 
運行效果

SELECT id AS id,`name`,email,gender,age FROM employee WHERE (gender = ? AND name LIKE ?) ORDER BY age

orderDesc()方法
注意其參數是一個column的集合。

代碼修改爲：

@Test
 public void testEntitymapperOrderBy() {
  
  List<Employee> employeeList=employeeMapper.selectList(new EntityWrapper<Employee>()
    .eq("gender",1)
    .like("name", "霸")
    //.orderBy("age")
    .orderDesc(Arrays.asList(new String[] {"age"}))
    );
  System.out.println("*******************"+employeeList);
  for (Employee employee : employeeList) {
   System.out.println(employee.getAge());
  }
 }

運行效果

SELECT id AS id,`name`,email,gender,age FROM employee WHERE (gender = ? AND name LIKE ?) ORDER BY age DESC

orderByAsc()方法
注意其參數是一個column的集合。

升序排列。

代碼測試：

@Test
 public void testEntitymapperOrderBy() {
  
  List<Employee> employeeList=employeeMapper.selectList(new EntityWrapper<Employee>()
    .eq("gender",1)
    .like("name", "霸")
    //.orderBy("age")
    //.last("desc")
    //.orderDesc(Arrays.asList(new String[] {"age"}))
    .orderAsc(Arrays.asList(new String[] {"age"}))
    );
  System.out.println("*******************"+employeeList);
  for (Employee employee : employeeList) {
   System.out.println(employee.getAge());
  }
 }

運行結果

SELECT id AS id,`name`,email,gender,age FROM employee WHERE (gender = ? AND name LIKE ?) ORDER BY age ASC

源碼下載
https://download.csdn.net/download/badao_liumang_qizhi/11142313