一、分页查询
1、selectByRowBounds(T record, RowBounds rowBounds)
说明:根据实体属性和RowBounds进行分页查询
案例:
/**
* SELECT emp_id,emp_name,emp_salary,emp_age FROM tabple_emp WHERE emp_id = ? AND emp_name = ?
*/
@Test
public void testSelectByRowBounds() {
int pageNo = 1;
int pageSize = 3;
int index = (pageNo - 1) * pageSize;
RowBounds rowBounds = new RowBounds(index, pageSize);
Employee emp = new Employee(1, "tom", null, null);
List<Employee> empList = employeeService.getEmpByRowBounds(emp, rowBounds);
empList.forEach(System.out::println);
}
public List<Employee> getEmpByRowBounds(Employee emp, RowBounds rowBounds) {
return employeeMapper.selectByRowBounds(emp, rowBounds);
}
通过sql可以看到,并没有使用 limit 关键字,而是把所有的数据查询出来,进行内存的分页。
2、