基本查询
<h3>MyBatisPlus基础查询使用：</h3>
<ul>
<li>
<p>1:多条件查询&排序:</p>
<pre><code>QueryWrapper<User> queryWrapper = new QueryWrapper<>();
queryWrapper.lambda().ge(User::getId, 100).orderByDesc(User::getId);
list = userService.list(queryWrapper);</code></pre>
</li>
<li>
<p>2：模糊查询:</p>
<pre><code>QueryWrapper<User> queryWrapper=new QueryWrapper<>();
queryWrapper.lambda().like(User::getId,12);
List<User> list = userService.list(queryWrapper);
for (User user : list) {
System.out.println(user.toString());
}</code></pre>
</li>
<li>3:根据Wrapper更新：</li>
</ul>
<pre><code>//根据wrapper 更新
LambdaQueryWrapper<User> updateWrapper = new QueryWrapper<User>().lambda().eq(User::getId, 101);
User user = new User();
user.setUsername("东方不败");
user.setCreateDate(new Date());
boolean update_flag = userService.update(user, updateWrapper);</code></pre>
<ul>
<li>4:只查询一行：</li>
</ul>
<pre><code>LambdaQueryWrapper<User> queyr = new LambdaQueryWrapper<User>().eq(User::getId, 1);
User one = userService.getOne(queyr);</code></pre>
<ul>
<li>5:统计：</li>
</ul>
<pre><code> LambdaQueryWrapper<User> queyr = new LambdaQueryWrapper<User>().eq(User::getId, 1);
int count = userService.count(queyr);</code></pre>