<insert id="insert" parameterType="RafflePrizeRelationEntity" useGeneratedKeys="true" keyProperty="id"> INSERT INTO <include refid="table"/> (<include refid="insert_column"/>) VALUES (#{raffleId},#{prizeNum},#{prizeId},#{prizeName},#{prizePhoto},#{prizeInstruction},#{probability},#{prizeLimit},#{isDel},#{createUserId},#{createTime},#{updateUserId},#{updateTime}) </insert>
时间: 2023-11-01 21:39:06 浏览: 62
这是一个 MyBatis 的 XML 映射文件中的插入语句,用于将 RafflePrizeRelationEntity 对象插入数据库中的表格中。其中,<include refid="table"/> 和 <include refid="insert_column"/> 都是引用了其他的 XML 片段,用于指定要插入的表格和列名。通过使用 #{} 语法,可以将 RafflePrizeRelationEntity 对象中的属性值与 SQL 语句中的占位符相对应,从而插入正确的数据。其中,keyProperty="id" 指定了自动生成的主键 ID 要赋值给 RafflePrizeRelationEntity 对象的 id 属性。
相关问题
<insert id="insertOrder" parameterType="Integer" useGeneratedKeys="true" keyProperty="order_id"> insert into orders(user_id, total) select user_id, sum(total) from cart where user_id = #{userId} </insert> <insert id="insertOrderDetail" parameterType="Integer"> insert into order_detail(order_id, book_id, num, total) select #{order_id}, c.book_id, c.num, c.total from cart c where c.user_id = #{userId} </insert> 前端只发送了一个调用insertOrder的请求,但我想执行完insertOrder后,能够自动的执行insertOrderDetail,在mapper中应该如何实现
您可以在mapper中使用Mybatis的<selectKey>标签来实现这个功能,具体方法如下:
1. 在insertOrder标签中添加<selectKey>标签,用于获取自动生成的order_id,如下所示:
```
<insert id="insertOrder" parameterType="Integer" useGeneratedKeys="true" keyProperty="order_id">
<selectKey keyProperty="order_id" resultType="java.lang.Integer" order="AFTER">
SELECT LAST_INSERT_ID()
</selectKey>
insert into orders(user_id, total)
select user_id, sum(total) from cart where user_id = #{userId}
</insert>
```
2. 在insertOrder标签的末尾添加<include>标签,用于调用insertOrderDetail标签,如下所示:
```
<insert id="insertOrder" parameterType="Integer" useGeneratedKeys="true" keyProperty="order_id">
<selectKey keyProperty="order_id" resultType="java.lang.Integer" order="AFTER">
SELECT LAST_INSERT_ID()
</selectKey>
insert into orders(user_id, total)
select user_id, sum(total) from cart where user_id = #{userId}
<include refid="insertOrderDetail"/>
</insert>
```
这样,在执行完insertOrder后,Mybatis会自动执行insertOrderDetail,并将order_id作为参数传递给insertOrderDetail。注意,在insertOrderDetail中,您需要使用#{order_id}来引用order_id参数。
这种方式可以实现两个insert语句的自动执行,并且可以保证在同一事务中执行,避免了数据不一致的问题。
mybatis-plus如何实现
根据提供的引用内容,MyBatis-Plus的实现流程如下:
1. 引入MyBatis-Plus依赖,可以通过Maven方式引入,例如:
```xml
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.3.1</version>
</dependency>
```
2. 配置MyBatis-Plus,可以在application.yml或application.properties文件中添加如下配置:
```yaml
mybatis-plus:
# mapper文件位置
mapper-locations: classpath:/mapper/*.xml
# 实体类包名
typeAliasesPackage: com.example.entity
```
3. 创建实体类,可以使用Lombok注解简化代码,例如:
```java
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private Long id;
private String name;
private Integer age;
private String email;
}
```
4. 创建Mapper接口,可以继承MyBatis-Plus提供的BaseMapper接口,例如:
```java
public interface UserMapper extends BaseMapper<User> {
}
```
5. 创建Mapper.xml文件,可以使用MyBatis-Plus提供的自动填充功能,例如:
```xml
<mapper namespace="com.example.mapper.UserMapper">
<resultMap id="BaseResultMap" type="com.example.entity.User">
<id column="id" property="id" />
<result column="name" property="name" />
<result column="age" property="age" />
<result column="email" property="email" />
</resultMap>
<sql id="Base_Column_List">
id, name, age, email
</sql>
<insert id="insert" parameterType="com.example.entity.User">
<selectKey keyProperty="id" resultType="java.lang.Long" order="BEFORE">
SELECT IFNULL(MAX(id), 0) + 1 FROM user
</selectKey>
INSERT INTO user (id, name, age, email)
VALUES (#{id}, #{name}, #{age}, #{email})
</insert>
<update id="updateById" parameterType="com.example.entity.User">
UPDATE user
SET name = #{name}, age = #{age}, email = #{email}
WHERE id = #{id}
</update>
<select id="selectById" resultMap="BaseResultMap" parameterType="java.lang.Long">
SELECT <include refid="Base_Column_List" />
FROM user
WHERE id = #{id}
</select>
<delete id="deleteById" parameterType="java.lang.Long">
DELETE FROM user
WHERE id = #{id}
</delete>
<select id="selectList" resultMap="BaseResultMap">
SELECT <include refid="Base_Column_List" />
FROM user
</select>
</mapper>
```
6. 在Service中调用Mapper接口,例如:
```java
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public User getById(Long id) {
return userMapper.selectById(id);
}
@Override
public List<User> list() {
return userMapper.selectList(null);
}
@Override
public boolean save(User user) {
return userMapper.insert(user) > 0;
}
@Override
public boolean updateById(User user) {
return userMapper.updateById(user) > 0;
}
@Override
public boolean removeById(Long id) {
return userMapper.deleteById(id) > 0;
}
}
```
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