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Using a TSQL cursor to import data
Posted on 2011-03-08
I have written an export routine in TSQL which imports data from a flat file database into a new database which contains different tables but links all the fields to the main data table.
Having been able to successfully import one data record and all of its linked fields (USING SELECT AND INSERT INTO statements, I need to automate the process using a cursor and import thousands of records. I would like to achieve the following:
Import from a select statement all of the main table data, which I believe would be loaded into the cursor. This holds the foreign key for linking the other tables
I then want to pass the record IDs from the above results and somehow link this with the next batch of inserts in the cursor so that all of the data is linked to the correct tables when running the cursor?
How would I go about this in TSQL?
Having been able to successfully import one data record and all of its linked fields (USING SELECT AND INSERT INTO statements, I need to automate the process using a cursor and import thousands of records. I would like to achieve the following:
Import from a select statement all of the main table data, which I believe would be loaded into the cursor. This holds the foreign key for linking the other tables
I then want to pass the record IDs from the above results and somehow link this with the next batch of inserts in the cursor so that all of the data is linked to the correct tables when running the cursor?
How would I go about this in TSQL?
2
2 Comments
If you're able to link between the 2 tables, then a cursor may not be necessary.
First, you can do your insert into the main table.
Then, join your second table to the new main table based on the FK relationship. This will get you the ID information you require for the insert statement. Then you should have the necessary information to run the insert.
First, you can do your insert into the main table.
Then, join your second table to the new main table based on the FK relationship. This will get you the ID information you require for the insert statement. Then you should have the necessary information to run the insert.
Slightly more detailed, say you have Q1 and Q2 as the 2 queries you're trying to populate.
First, you can just insert into table1 select * from Q1
Then, you would do something like
insert into table2 select table1.ID, Q2.* from Q2 inner join table1 on Q2.FKField = table1.FKField
Since there should be some sort of natural relationship already present
First, you can just insert into table1 select * from Q1
Then, you would do something like
insert into table2 select table1.ID, Q2.* from Q2 inner join table1 on Q2.FKField = table1.FKField
Since there should be some sort of natural relationship already present
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