lambdaquerywrapper.eq

`LambdaQueryWrapper.eq` 是 MyBatis-Plus 框架中的一个查询条件构造器，用于构造等于条件。它可以和 `LambdaQueryWrapper` 一起使用，通过 Lambda 表达式指定查询条件，代码示例如下：

LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(User::getName, "张三");
List<User> userList = userMapper.selectList(queryWrapper);

以上代码会查询出名字为 "张三" 的用户列表。

相关问题

LambdaQueryWrapper.eq

LambdaQueryWrapper.eq是一种Lambda语法的方法，用于在LambdaQueryWrapper对象中设置相等条件。具体来说，它接受一个函数作为参数，该函数用于获取要比较的属性值，并将其与指定的值进行比较。在引用的示例中，eq(Comment::getArticleId, id)的作用是设置查询条件，要求Comment对象的articleId属性等于参数id的值。这里的Comment::getArticleId表示获取Comment对象的articleId属性值，而不是设置它。所以eq方法相当于将ArticleId的值与参数id进行比较。<span class="em">1</span>
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lambdaQueryWrapper.eq

lambdaQueryWrapper.eq() is a method used in the MyBatis Plus library for building database queries using lambda expressions.

The eq() method is used to create a condition where a column in the database table must be equal to a specific value. It takes two arguments: the column name and the value to compare against.

For example, the following code snippet shows how to use eq() to build a query that retrieves all users whose age is 30:

LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(User::getAge, 30);
List<User> userList = userMapper.selectList(queryWrapper);

In this example, we create a query wrapper using the LambdaQueryWrapper class, then use the eq() method to specify that we want to retrieve users whose age column is equal to 30. Finally, we execute the query using the selectList() method of the userMapper object.