MybatisPlus Wrapper 自定義條件構造器

查詢條件構造器 QueryWrapper

// lt：less than 小於

// le：less than or equal to 小於等於
// eq：equal to 等於
// ne：not equal to 不等於
// ge：greater than or equal to 大於等於
// gt：greater than 大於

QueryWrapper<FormOrg> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("APP_CODE", appCode);
        queryWrapper.in("ORG_CODE", orgList);
        queryWrapper.eq("APPLY_TYPE_CODE", "");
        queryWrapper.le("BEGIN_DATE", startDate);
        queryWrapper.ge("END_DATE", startDate);
        queryWrapper.eq("TURN_ON_OR_NOT", "1");

List<FormOrg> list = xxxService.list(queryWrapper);

引入lambda，避免我們在代碼中寫類似的於 APP_CODE 的硬編碼 LambdaQueryWrapper<SysUser>

LambdaQueryWrapper<SysUser> queryWrapper = new QueryWrapper<SysUser>().lambda();
// 簡化寫法如下        
// LambdaQueryWrapper<SysUser> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SysUser::getUserName, "admin");
        List<SysUser> list = sysUserMapper.selectList(queryWrapper);
        System.out.println(list);

• 鏈式查詢 LambdaQueryChainWrapper （粗體是區別，注意）

 List<SysUser> list1 = new LambdaQueryChainWrapper<>(sysUserMapper)
                .eq(SysUser::getUserName, "admin")
                .list();

查詢一條記錄，通過id查詢某條記錄的詳情，使用.one()即可

SysUser sysUser = new LambdaQueryChainWrapper<>(sysUserMapper)
                .eq(SysUser::getId, "1")
                .one();

 select 指定查詢字段

queryWrapper.select("USER_NAME","USER_CODE");

 

 

未完，待續。。。