select * from odn_project_instance.t_instance_group_cfg
json操作
JSONObject body = response.getBody();
JSONArray array = body.getJSONArray("result");
result = JSON.parseObject(array.toString(), new TypeReference<List<Map<String,String>>>(){});
java8对集合进行分组操作
List<Map<String, String>> entirModuleData = parameterMapper.getEntirModuleData(instanceId, language);//获取基础数据
Map<String, List<Map<String,String>>> modulesMap = entirModuleData.stream().collect(Collectors.groupingBy(p->p.get("moduleName")));//对模块进行分组
String.Contains()判断字符串中是否包含子字符串
case when then再update语句中的用法:
update t_instance_group_cfg set item_value = CASE group_item_code
updateMap.forEach(p->{sb.append(" when '"+p.get("group_item_code")+"' then '"+p.get("item_value")+"' ");});
json_set()的使用:
set ot.language_column=Json_SET(ot.language_column,'$.name_en_us',cf.item_value->>'$.name_en_us','$.name_zh_cn',cf.item_value->>'$.name_zh_cn')
json_set(data,"$.address","Guangzhou")
MySQL中concat函数:
返回结果为连接参数产生的字符串。如有任何一个参数为NULL ,则返回值为 NULL。
select CONCAT(group_item_code,'_code') from t_instance_group_cfg; //会查询t_instance_group_cfg表中group_item_code字段值并将每个值后面拼接上_code
SQL语句中update后面还可以进行多表关联!
常见的update语句:update t1 set f=...,f2=... where ...
update t1 inner join t2 on ... set t1.f=... where ...
sql语句中批量插入:
INSERT INTO triangle (sidea, sideb) VALUES(1,1),(3,4),(6,8);