借助CLR,首先实现字符串的互转,然后使用存储过程实现JSON2table
- public class JsonFunction
- {
- /// <summary>
- /// XML转JSON
- /// </summary>
- /// <param name="xml"></param>
- /// <returns></returns>
- /// <remarks>
- /// json不建议太长
- /// </remarks>
- [Microsoft.SqlServer.Server.SqlFunction(Name = "Xml2Json")]
- public static SqlString Xml2Json(SqlXml xml)
- {
- System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
- doc.LoadXml(xml.Value);
- string json = JsonConvert.SerializeXmlNode(doc, Formatting.Indented);
- doc.Clone();
- return new SqlString(json);
- }
- [Microsoft.SqlServer.Server.SqlFunction(Name = "Json2Xml")]
- public static SqlXml Json2Xml(string json)
- {
- System.Xml.XmlDocument doc = JsonConvert.DeserializeXmlNode(json);
- System.IO.StringWriter sw = new System.IO.StringWriter();
- doc.WriteTo(new System.Xml.XmlTextWriter(sw));
- return new SqlXml(new System.Xml.XmlTextReader(new System.IO.StringReader(sw.ToString())));
- }
- [Microsoft.SqlServer.Server.SqlProcedure(Name = "Json2Table")]
- public static void Json2Table(string path, string json)
- {
- System.Xml.XmlDocument doc = JsonConvert.DeserializeXmlNode(json);
- System.Xml.XmlNodeList list = null;
- if (!string.IsNullOrEmpty(path))
- list = doc.SelectNodes(path);
- else
- list = doc.ChildNodes;
- if (list == null || list.Count == 0)
- return;
- List<SqlMetaData> metas = new List<SqlMetaData>();
- string lastName = "";
- bool flag = false;
- for (int i = 0; i < list[0].ChildNodes.Count; i++)
- {
- if (lastName == list[0].ChildNodes[i].Name)
- {
- flag = true;
- break;
- }
- else
- lastName = list[0].ChildNodes[i].Name;
- metas.Add(new SqlMetaData(list[0].ChildNodes[i].Name, SqlDbType.NVarChar, SqlMetaData.Max));
- }
- var rec = new SqlDataRecord(metas.ToArray());
- SqlContext.Pipe.SendResultsStart(rec);
- foreach (System.Xml.XmlNode node in list)
- {
- if (flag)//行模式
- for (int i = 0; i < node.ChildNodes.Count; i++)
- {
- rec.SetString(0, node.ChildNodes[i].InnerXml);
- SqlContext.Pipe.SendResultsRow(rec);
- }
- else
- {
- for (int i = 0; i < metas.Count; i++)
- {
- rec.SetString(i, node.ChildNodes[i].InnerXml);
- }
- SqlContext.Pipe.SendResultsRow(rec);
- }
- }
- SqlContext.Pipe.SendResultsEnd();
- }
- //public static void Json2Table(string json)
- //{
- // //find first array
- // Q.Json.Linq.JObject jo = JsonConvert.DeserializeObject(json) as Q.Json.Linq.JObject;
- // Q.Json.Linq.JToken token = jo.First;
- // while (token != null && token.Type != Q.Json.Linq.JTokenType.Array)
- // {
- // token = token.First;
- // }
- // if (token == null)
- // return;
- // Q.Json.Linq.JArray array = token as Q.Json.Linq.JArray;
- // if (array.Count == 0)
- // return;
- // List<SqlMetaData> metas = new List<SqlMetaData>();
- // token = array[0].First;
- // while (token != null)
- // {
- // metas.Add(new SqlMetaData((token as Q.Json.Linq.JProperty).Name, SqlDbType.NVarChar, SqlMetaData.Max));
- // token = token.Next;
- // }
- // var rec = new SqlDataRecord(metas.ToArray());
- // SqlContext.Pipe.SendResultsStart(rec);
- // foreach (var item in array)
- // {
- // for (int i = 0; i < metas.Count; i++)
- // {
- // rec.SetString(i, item[metas[i].Name].ToString());
- // }
- // SqlContext.Pipe.SendResultsRow(rec);
- // }
- // SqlContext.Pipe.SendResultsEnd();
- //}
- }
测试语句
- DROP TABLE test
- CREATE TABLE TEST ( NAME VARCHAR(5), DATA XML )
- GO
- INSERT INTO TEST
- VALUES ( 'A', '<ROOT><M>AAAA</M></ROOT>' )
- ,
- ( 'B', '<ROOT><D>00000</D></ROOT>' )
- , ( 'C', '123' )
- SELECT *
- FROM test
- --DECLARE @X XML
- --SELECT @x = ( SELECT *
- -- FROM test
- -- FOR
- -- XML AUTO ,
- -- ELEMENTS ,
- -- ROOT
- -- )
- --SELECT @x
- --DECLARE @json NVARCHAR(MAX)
- --SELECT @json = dbo.xml2json(@x)
- --SELECT @json
- --SELECT dbo.Json2Xml(@json)
- SELECT dbo.Xml2Json(( SELECT *
- FROM test
- FOR
- XML AUTO ,
- ELEMENTS ,
- ROOT
- )) xml2json
- SELECT dbo.Json2Xml(dbo.Xml2Json(( SELECT *
- FROM test
- FOR
- XML AUTO ,
- ELEMENTS ,
- ROOT
- ))) json2xml
- DECLARE @json NVARCHAR(MAX)
- SET @json = dbo.Xml2Json(( SELECT *
- FROM test
- FOR
- XML AUTO ,
- ELEMENTS ,
- ROOT
- ))
- EXECUTE dbo.json2table 'root/test', @json
- EXECUTE dbo.json2table '', @json
执行效果
参考
http://www.json4sql.com/examples.html
https://www.simple-talk.com/sql/t-sql-programming/consuming-json-strings-in-sql-server/