mybatis-plus的and方法怎么用
时间: 2023-03-26 18:02:57 浏览: 382
mybatis-plus的and方法可以用于拼接多个查询条件,例如:
QueryWrapper<User> wrapper = new QueryWrapper<>();
wrapper.eq("name", "张三").and(i -> i.eq("age", 18).or().eq("age", 20));
这个例子中,and方法将两个查询条件拼接在一起,查询名字为张三且年龄为18或20的用户。
相关问题
mybatis-plusand和or
MyBatis-Plus is an open-source persistence framework for Java applications. It is an extension to the MyBatis framework, providing additional features and functionalities to simplify database operations.
When it comes to combining conditions in MyBatis-Plus, you can use both "and" and "or" operators to construct complex queries. Here's how you can use them:
1. Using "and" operator:
You can use the `and` method to add multiple conditions together, which means all conditions must be true for a record to be included in the result. Here's an example:
```java
QueryWrapper<Entity> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("column1", value1)
.and(wrapper -> wrapper.eq("column2", value2)
.ne("column3", value3));
```
2. Using "or" operator:
You can use the `or` method to add multiple conditions together, which means any of the conditions can be true for a record to be included in the result. Here's an example:
```java
QueryWrapper<Entity> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("column1", value1)
.or(wrapper -> wrapper.eq("column2", value2)
.ne("column3", value3));
```
With these operators, you can build complex queries by combining multiple conditions in MyBatis-Plus.
mybatis-plus and使用
Mybatis-Plus是一个基于Mybatis的增强工具,它简化了Mybatis的开发流程,提供了许多实用的功能,如自动生成代码、分页查询、条件构造器等。使用Mybatis-Plus可以大大提高开发效率,减少重复代码的编写。