TSQL Inserting records from XML string

Question

I have a SQL query that is inserting records into a table from an XML string that I pass to it. The string could contain 1 node or multiple so each one is a new record.

Answer 1

Given the clarification of this statement in the question:

For each trainer, I need to also insert a record into that table but it needs to have the last inserted record id of the segment.

being (as found in the comments on the question):

There would be a total of 4 records inserted into the trainer table, 2 have the segment id of 1 and the other 2 with the segment id of 2.

The following will insert this data into related tables that have auto-incrementing IDs. In the sample data, I varied the EmpID values slightly to make it clearer that it is indeed working as expected.

DECLARE @DocumentID INT, @ImportData XML;

SET @ImportData = N'
<root>
    <data>
      <segment>
         <trainingEventID>9</trainingEventID>
         <localeID>641</localeID>
         <numOfTeammates>12</numOfTeammates>
         <nonProdHrs>21</nonProdHrs>
         <segmentDate>10/10/2014</segmentDate>
         <trainers>
            <trainer>
               <empID>HUS123</empID>
            </trainer>
            <trainer>
               <empID>Dan123</empID>
            </trainer>
         </trainers>
      </segment>
    </data>
    <data>
      <segment>
         <trainingEventID>9</trainingEventID>
         <localeID>641</localeID>
         <numOfTeammates>12</numOfTeammates>
         <nonProdHrs>21</nonProdHrs>
         <segmentDate>10/25/2014</segmentDate>
         <trainers>
            <trainer>
               <empID>HUS1234</empID>
            </trainer>
            <trainer>
               <empID>Dan1234</empID>
            </trainer>
         </trainers>
      </segment>
   </data>
</root>';


DECLARE @Segment TABLE (SegmentId INT NOT NULL IDENTITY(1, 1) PRIMARY KEY,
                        TrainingEventID INT NOT NULL, -- Unique
                        LocaleID INT NOT NULL, -- Unique
                        NumOfTeammates INT,
                        NonProdHrs INT,
                        SegmentDate DATE); -- Unique
-- Ideally create UNIQUE INDEX with the 3 fields noted above
DECLARE @Trainer TABLE (TrainerId INT NOT NULL IDENTITY(1, 1) PRIMARY KEY,
                        SegmentID INT NOT NULL, -- FK to Segment.SegmentID
                        EmpID VARCHAR(50) NOT NULL);

EXEC sp_xml_preparedocument @DocumentID OUTPUT, @ImportData;

-- First pass: extract "Segment" rows
INSERT INTO @Segment
            (TrainingEventID, LocaleID, NumOfTeammates, NonProdHrs, SegmentDate)
   SELECT TrainingEventID, LocaleID, NumOfTeammates, NonProdHrs, SegmentDate
   FROM   OPENXML (@DocumentID, N'/root/data/segment', 2) 
             WITH (TrainingEventID   INT  './trainingEventID/text()', 
                   LocaleID          INT  './localeID/text()',
                   NumOfTeammates    INT  './numOfTeammates/text()',
                   NonProdHrs        INT  './nonProdHrs/text()',
                   SegmentDate       DATE './segmentDate/text()');


-- Second pass: extract "Trainer" rows
INSERT INTO @Trainer (SegmentID, EmpID)
   SELECT seg.SegmentID, trnr.EmpID
   FROM   OPENXML (@DocumentID, N'/root/data/segment/trainers/trainer', 2) 
             WITH (TrainingEventID   INT         '../../trainingEventID/text()',
                   LocaleID          INT         '../../localeID/text()',
                   SegmentDate       DATE        '../../segmentDate/text()',
                   EmpID             VARCHAR(50) './empID/text()') trnr
   INNER JOIN @Segment seg
           ON seg.[TrainingEventID] = trnr.[TrainingEventID]
          AND seg.[LocaleID] = trnr.[LocaleID]
          AND seg.[SegmentDate] = trnr.[SegmentDate];


EXEC sp_xml_removedocument @DocumentID;
-------------------

SELECT * FROM @Segment ORDER BY [SegmentID];
SELECT * FROM @Trainer ORDER BY [SegmentID];

Output:

SegmentId   TrainingEventID   LocaleID   NumOfTeammates   NonProdHrs   SegmentDate
1           9                 641        12               21           2014-10-10
2           9                 641        12               21           2014-10-25

TrainerId   SegmentID   EmpID
1           1           HUS123
2           1           Dan123
3           2           HUS1234
4           2           Dan1234

References:

• OPENXML
• sp_xml_preparedocument
• sp_xml_removedocument