CustomInterceptor to intercept @UpdateProvider linked method,but execute twice

Question

I defined an interceptor to intercept the update method.The method body only prints the intercepted SQL.

The SQL is constructed through the buildupdatesql () method in @ updateprovider and internally created using "org. Apache. Ibatis. JDBC. SQL".

But the buildoupdatesql () method was executed twice.

The effect is shown in the figure below:

MyBatis version

3.5.7

Database vendor and version

MySQL 5.7.34-log

Expected result

buildUpdateSql() method only execute once.

Actual result

buildUpdateSql() method execute twice.

Kernel Code

@Repository
public interface UserMapper  {
    List<User> Sel();
    @UpdateProvider(type = UserMapperProvider.class, method = "buildUpdateSql")
    public int updateSubSite(int id);
    public static class UserMapperProvider{
        public String buildUpdateSql(int id) {
            String sql = "update user set name='gfgfgfg' where id=#{id}";
            System.out.println("构造的sql时："+sql);
            return sql;
        }
    }
}

@Intercepts({ @Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }) })
public class CustomInterceptor implements Interceptor {
    private Properties properties;
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
        String sql = mappedStatement.getBoundSql(invocation.getArgs()[1]).getSql();
        System.out.println("获取到SQL语句：" + sql);
    }
}

@Configuration
public class MybatisConfig {
@Autowired
  private List<SqlSessionFactory> sqlSessionFactoryList;
   @PostConstruct
   public void addMySqlInterceptor() {
       CustomInterceptor interceptor = new CustomInterceptor();
       for (SqlSessionFactory sqlSessionFactory : sqlSessionFactoryList) {
           sqlSessionFactory.getConfiguration().addInterceptor(interceptor);
       }
   }
}