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+# Mybatis初步复习
+
+## 1.SpringBoot整合Mybatis
+
+## 1.1第一步添加依赖
+
+```
+
+
+
+ org.mybatis.spring.boot
+ mybatis-spring-boot-starter
+ 3.0.5
+
+
+```
+
+
+
+### 1.2进行配置
+
+```
+#配置Mybatis
+mybatis:
+ configuration:
+ #在映射为java对象，将表中的下划线命名自动转换成驼峰式命名
+ map-underscore-to-camel-case: true
+ #日志前缀 可选
+ log-prefix: mybatis.
+ #日志实现类 可选
+ log-impl: org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl
+ #动态sql文件存储位置
+ mapper-locations: classpath:/mapper/**/*.xml
+
+#配置日志显示sql
+logging:
+ level:
+ #指定日志前缀
+ mybatis: debug
+
+
+```
+
+### 1.3 在Dao层编写的mapper接口，添加@Mapper注解
+
+
+
+### 1.4 编写动态sql文件（xx.xml文件）
+
+
+
+### 1.5 安装mybatisx插件
+
+
+
+安装之后在mapper和动态SQL文件对应代码左边有一个小鸟图标，方便直接跳转
+
+
+
+## 2.自动映射
+
+当开启驼峰命名自动映射
+
+```yaml
+mybatis:
+ configuration:
+ map-underscore-to-camel-case: true
+```
+
+## 3.手动映射
+
+当自动映射无法满足需求时，可以使用 `` 进行精确的手动映射。
+
+```xml
+
+
+
+
+
+
+
+
+
+
+
+```
+
+举例：
+
+### 3.1基础字段映射
+
+```java
+实体类
+public class User {
+ private Long userId; // 与数据库字段名不同
+ private String userName; // 需要手动映射
+ private String email;
+ private Integer status;
+ private LocalDateTime createTime;
+ private LocalDateTime updateTime;
+
+ // 构造函数、getter、setter...
+}
+```
+
+```sql
+数据库表结构：
+CREATE TABLE t_user (
+ id BIGINT PRIMARY KEY,
+ name VARCHAR(50),
+ email VARCHAR(100),
+ status TINYINT,
+ created_at DATETIME,
+ updated_at DATETIME
+);
+
+```
+
+```xml
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+说明：
+
+
+
+### 3.2一对一关联映射
+
+#### 3.2.1单次查询嵌套结果映射
+
+举例：
+
+```java
+实体类
+public class User {
+ private Long userId;
+ private String userName;
+ private UserProfile userProfile; // 一对一关联
+ // getter/setter...
+}
+
+public class UserProfile {
+ private Long profileId;
+ private Long userId;
+ private String realName;
+ private Integer age;
+ private String address;
+ private String phone;
+ // getter/setter...
+}
+```
+
+```xml
+手动映射配置：
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+#### 3.2.2 多次查询嵌套查询映射
+
+```xml
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+
+
+### 3.3一对多集合映射
+
+```java
+实体类：
+public class User {
+ private Long userId;
+ private String userName;
+ private List orders; // 一对多关联
+ // getter/setter...
+}
+
+public class Order {
+ private Long orderId;
+ private Long userId;
+ private String orderNumber;
+ private BigDecimal amount;
+ private LocalDateTime orderTime;
+ // getter/setter...
+}
+```
+
+```xml
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+### 3.4复杂的多层嵌套
+
+```java
+public class User {
+ private Long userId;
+ private String userName;
+ private List orders;
+}
+
+public class Order {
+ private Long orderId;
+ private String orderNumber;
+ private List orderItems;
+}
+
+public class OrderItem {
+ private Long itemId;
+ private Long productId;
+ private Integer quantity;
+ private Product product; // 关联商品
+}
+
+public class Product {
+ private Long productId;
+ private String productName;
+ private BigDecimal price;
+}
+```
+
+```xml
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+### 3.5.注意
+
+1.可以 自动映射与手动映射结合
+
+```xml
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+##
+
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