‘壹’ 求一个数据库函数解析json 如下图要求
数据库只是用来存储数据的,为什么橘搭不把处理数据的部分放在后台?
在这里你需要了解以下几个知识点。
在sqlserver 中存储json ,需要用字符串类型进行存储,一般用nvarchar()或 varchar()进行存储。
openJson:打开Json字符串
IsJson:判断一个字符串圆稿拿是不是合法的Json格式。是返回1,否返回0,null返回null。
Json_Value:从Json字符串中提取值。
Json_Query:Json字符串中提取对象或数组。
Json_Modify:更新Json字符串中的属性值,并返回更新的Json字符串
然敬渣后参考图片的需求,获取输入key值中的value字段可以得到如下sql语句。
从JSON中获取输入B的JSON对象
SELECT JSON_QUERY(json, CONCAT('$.',key)) INTO K_VAL;
从B的JSON对象中,获取value字段的值
SELECT JSON_VALUE(K_VAL, '$.value') INTO JSONVALUE;
最终我们的声明的函数大概是:
CREATE FUNCTION PARSEJSON(json VARCHAR(2000), key VARCHAR(200))
RETURNS VARCHAR
BEGIN
declare JSONVALUE VARCHAR;
declare K_VAL VARCHAR;
SELECT JSON_QUERY(json, CONCAT('$.',key)) INTO K_VAL;
SELECT JSON_VALUE(K_VAL, '$.value') INTO JSONVALUE;
return JSONVALUE;
‘贰’ Oracle数据库中怎么处理json字符串,本人小
Oracle 12.1.0.2版本有一个新功能就是可以存储、查询、索引JSON数据格式,而且也实现了使用SQL语句来解析JSON,非常方便。JSON数据在数据库中以VARCHAR2, CLOB或者BLOB进行存储。Oracle建议用户在插入JSON数据之前,使用is_json来验证输入JSON数据的正确性。另外,Oracle也提供了相关的函数:
Functions:json_value, json_query, json_table.
Conditions:json_exists, is json, is not json, json_textcontains.
‘叁’ db2 sql怎么解析json
jsp页面的数据转换成json格式可以采用js来解析:
例如在ation中:
bookList = new ArrayList<Books>();
JSONObject json = new JSONObject();
json.accumulate("bookList", bookList);
json.accumulate("pageNum", pageNum);
json.accumulate("totalPages", totalPages);
json.accumulate("totalNum", totalNum);
jsonObj = json.toString();
‘肆’ sql中json解析
你好!
withtas(select'a:[{f:,h:,checindate:''month1:,year:,day:'',checkoutdate:''month:,year:,day:'',},
{checindate:''month2:,year:,day:,'',checkoutdate:''month:,year:,day},
{checindate:''month3:,year:,day:,'',checkoutdate:''month:,year:,day}]'strfromal)
,t1as(SELECTsubstr(str,instr(str,'[')+1,instr(str,']')-instr(str,'[')-1)strFROMT)
,t2as(selectsubstr(str,instr(str,'{')+1,instr(str,'}')-instr(str,'{')-1)strfromt1)
selectstr,substr(str,instr(str,'checindate')+12,instr(str,'checkoutdate')-instr(str,'checindate')-12)fromt2;
得到第一个checindate,直接截取字符串就可以了
别搞得那么复杂了
‘伍’ SQL server存储过程实现JSON数据解析,然后插入数据库表求高手指点
两种方式
1、SQL有个charindex 函数,可以用这个函数配合substr实现 split功能实现循环插入
2、sql 2008以上存储过程支持表值参数,json反序列化在程序里更方便,所以反序列化之后通过表值参数传递
‘陆’ 求救,mysql怎么解析json
DELIMITER $$ USE `dw`$$ DROP FUNCTION IF EXISTS `fn_Json_getKeyValue`$$ CREATE DEFINER=`data`@`%` FUNCTION `fn_Json_getKeyValue`( in_JsonArray VARCHAR(4096),#JSON数组字符串 in_Index TINYINT, #JSON对象序号,序号从1开始 in_KeyName VARCHAR(64)#键名 ) RETURNS VARCHAR(512) CHARSET utf8 BEGIN DECLARE vs_return VARCHAR(4096); DECLARE vs_JsonArray, vs_Json, vs_KeyName VARCHAR(4096); #declare vs_Json varchar(4096); DECLARE vi_pos1, vi_pos2 SMALLINT UNSIGNED; #写监控日志 #insert into dw.t_etl_log(sp_name, title, description) #values('dw.fn_Json_getKeyValue', '通过Json键名取键值', concat('in_JsonArray=', in_JsonArray)); SET vs_JsonArray = TRIM(in_JsonArray); SET vs_KeyName = TRIM(in_KeyName); IF vs_JsonArray = '' OR vs_JsonArray IS NULL OR vs_KeyName = '' OR vs_KeyName IS NULL OR in_Index 0 THEN #如果键名存在 SET vi_pos1 = vi_pos1 + CHAR_LENGTH(vs_KeyName); SET vi_pos2 = LOCATE(',', vs_json, vi_pos1); IF vi_pos2 = 0 THEN #最后一个元素没有','分隔符,也没有结束符'}' SET vi_pos2 = CHAR_LENGTH(vs_json) + 1; END IF; SET vs_return = REPLACE(MID(vs_json, vi_pos1, vi_pos2 - vi_pos1), '"', ''); END IF; END IF; END IF; RETURN(vs_return); END$$ DELIMITER ; 测试: {"old_current_score":"2","new_current_score":"0","old_grade_id":"1","new_grade_id":"1","grade_time":"2016-04-09 00:43:26","grade_upgrade_time":"2017-04-09 00:43:26"} select fn_Json_getKeyValue(reason,1,'old_grade_id')
‘柒’ sql 处理 json
json的数据json.loads进来以后会变成一个json的对象,你需要自己把python对象中的字段值取出来,拼成sql语句你可以把这个过程封装成一个函数importjsondefsave_json(json_str):obj=json.loads(json_str)sql='insertintotblvalues("%s")'%obj['id']#这里注意编码,要转成数据库的编码格式#blabla
‘捌’ java将json数据解析为sql语句
importjava.util.Iterator;
importjava.util.Set;
importjava.util.Map.Entry;
importcom.google.gson.JsonArray;
importcom.google.gson.JsonElement;
importcom.google.gson.JsonObject;
importcom.google.gson.JsonParser;
publicclassSql
{
publicstaticStringparseSQL(Stringjson)
{
JsonParserparser=newJsonParser();
JsonObjectobj=(JsonObject)parser.parse(json);;
Stringtable=obj.get("table").getAsString();
Stringop_type=obj.get("op_type").getAsString();
Stringsql="";
if("I".equals(op_type))
{
sql+="INSERTINTO"+table+"(";
JsonObjectafter=(JsonObject)obj.get("after");
Set<Entry<String,JsonElement>>entry=after.entrySet();
Iterator<Entry<String,JsonElement>>it=entry.iterator();
Stringvs="values(";
while(it.hasNext())
{
Entry<String,JsonElement>elem=it.next();
Stringkey=elem.getKey();
Stringval=elem.getValue().toString();
sql+=key+",";
vs+=val+",";
}
sql=sql.replaceAll(",\s*$","");
vs=vs.replaceAll(",\s*$","");
sql+=")"+vs+")";
}
elseif("U".equals(op_type))
{
sql+="UPDATE"+table+"SET";
JsonObjectafter=(JsonObject)obj.get("after");
Set<Entry<String,JsonElement>>entry=after.entrySet();
Iterator<Entry<String,JsonElement>>it=entry.iterator();
while(it.hasNext())
{
Entry<String,JsonElement>elem=it.next();
Stringkey=elem.getKey();
Stringval=elem.getValue().toString();
sql+=key+"="+val+",";
}
sql=sql.replaceAll(",\s*$","");
sql+="WHERE";
after=(JsonObject)obj.get("before");
entry=after.entrySet();
it=entry.iterator();
while(it.hasNext())
{
Entry<String,JsonElement>elem=it.next();
Stringkey=elem.getKey();
Stringval=elem.getValue().toString();
sql+=key+"="+val+"AND";
}
sql=sql.replaceAll("\s*AND\s*$","");
}
elseif("D".equals(op_type))
{
sql+="DELETEFROM"+table+"WHERE";
JsonObjectafter=(JsonObject)obj.get("before");
Set<Entry<String,JsonElement>>entry=after.entrySet();
Iterator<Entry<String,JsonElement>>it=entry.iterator();
while(it.hasNext())
{
Entry<String,JsonElement>elem=it.next();
Stringkey=elem.getKey();
Stringval=elem.getValue().toString();
sql+=key+"="+val+"AND";
}
sql=sql.replaceAll("\s*AND\s*$","");
}
returnsql;
}
publicstaticvoidmain(String[]args)
{
Stringinsert=
"{"table":"GG.TCUSTORD","op_type":"I","op_ts":"2013-06-0222:14:36.000000","current_ts":"2015-09-18T13:39:35.447000","pos":"00000000000000001444","tokens":{"R":"AADPkvAAEAAEqL2AAA"},"after":{"CUST_CODE":"WILL","ORDER_DATE":"1994-09-30:15:33:00","PRODUCT_CODE":"CAR","ORDER_ID":"144","PRODUCT_PRICE":17520.00,"PRODUCT_AMOUNT":3,"TRANSACTION_ID":"100"}}";
Stringupdate=
"{"table":"GG.TCUSTORD","op_type":"U","op_ts":"2013-06-0222:14:41.000000","current_ts":"2015-09-18T13:39:35.748000","pos":"00000000000000002891","tokens":{"L":"206080450","6":"9.0.80330","R":"AADPkvAAEAAEqLzAAC"},"before":{"CUST_CODE":"BILL","ORDER_DATE":"1995-12-31:15:00:00","PRODUCT_CODE":"CAR","ORDER_ID":"765","PRODUCT_PRICE":15000.00,"PRODUCT_AMOUNT":3,"TRANSACTION_ID":"100"},"after":{"CUST_CODE":"BILL","ORDER_DATE":"1995-12-31:15:00:00","PRODUCT_CODE":"CAR","ORDER_ID":"765","PRODUCT_PRICE":14000.00,"PRODUCT_AMOUNT":3,"TRANSCATION_ID":"100"}}";
Stringdelete=
"{"table":"GG.TCUSTORD","op_type":"D","op_ts":"2013-06-0222:14:41.000000","current_ts":"2015-09-18T13:39:35.766000","pos":"00000000000000004338","tokens":{"L":"206080450","6":"9.0.80330","R":"AADPkvAAEAAEqLzAAC"},"before":{"CUST_CODE":"DAVE","ORDER_DATE":"1993-11-03:07:51:35","PRODUCT_CODE":"PLANE","ORDER_ID":"600"}}";
System.out.println(parseSQL(insert));
System.out.println(parseSQL(update));
System.out.println(parseSQL(delete));
}
}
‘玖’ sql server 2016怎么解析json
--1 带 Root Key
select * from sys_menu for JSON AUTO ,ROOT('Result')
--2 as
select ID,
Name,
Age as [Entity.Age],
Sex as [Entity.Sex]
from Student for json path
-- 3 输出有null列的 sql
select * from sys_menu for JSON AUTO ,ROOT('SUSU'), include_null_values
--4解析json --OPENJSON(将JSON文件转换为普通数据表)