場景

項目搭建專欄：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/column/info/37194

基礎搭建：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/89407994

條件構造器介紹使用：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/89482201

實現

排序前數據庫

orderBy()方法

默認升序。

/****條件構造器 排序操作*/@Testpublic 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。

代碼修改為：

@Testpublic 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：

@Testpublic 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

總結

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