CustomInterceptor to intercept @Provider linked method,but execute twice

Bug Report

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);
       }
   }
}

[gfgfggf1988]

@gfgfggf1988 ,

I understand what you want, but ProviderSqlSource#getBoundSql() subsequently calls the provider method, so there is nothing we can do.

Also note that modifying SQL using interceptor is not officially supported. Some users use reflection to do that, but I’m not sure if it’s possible with ProviderSqlSource.

If you need a help with writing complex interceptor, try posting a question to the mailing list or StackOverflow explaining what specifically you want to achieve.

Closing as it is not a bug.

fine,i will try another way to solve that.thx

[harawata]

@gfgfggf1988 ,

I understand what you want, but ProviderSqlSource#getBoundSql() subsequently calls the provider method, so there is nothing we can do.

Also note that modifying SQL using interceptor is not officially supported. Some users use reflection to do that, but I’m not sure if it’s possible with ProviderSqlSource.

If you need a help with writing complex interceptor, try posting a question to the mailing list or StackOverflow explaining what specifically you want to achieve.

Closing as it is not a bug.