golang删除map宕机

golang中怎么删除map中所有元素

std::map<LONG,CBlinkPCHandle*>::iterator it;
for( it = m_mapUserLoginGUID.begin(); it != m_mapUserLoginGUID.end(); it ++)
{
if(it->second != NULL)
{
it->second->RemoveAll();
delete it->second;
}
m_mapUserLoginGUID

postgres怎么删除mapping

修改字段 attnum

francs=> c francs postgres
You are now connected to database "francs" as user "postgres".
francs=# update pg_attribute set attnum=4 where attrelid='francs.test_6'::regclass and attname='col3';
UPDATE 1
francs=# update pg_attribute set attnum=3 where attrelid='francs.test_6'::regclass

android问题。。用map删除数据库时，出现这个问题，卡了一天了解决不了。。求大神帮忙。20分送上

字符串想转换成java.util.Objects 所以转换失败。。。。。。。。转成Object应该OK的

postgres怎么删除mapping

修改字段 attnum

francs=> c francs postgres
You are now connected to database "francs" as user "postgres".
francs=# update pg_attribute set attnum=4 where attrelid='francs.test_6'::regclass and attname='col3';
UPDATE 1
francs=# update pg_attribute set attnum=3 where attrelid='francs.test_6'::regclass