How Can I Efficiently Insert Data into Multiple Database Tables in a Single Operation?

Insert multiple database tables in one operation

In the field of database management, the problem of inserting data into multiple tables at the same time often occurs. This article explores various methods and provides an efficient solution.

Problem description:

Suppose a database contains three tables: Object_Table, Data_Table and Link_Table. Link_Table Join records from the other two tables. The goal is to copy data from Data_Table associated with a specific object identifier and insert new records to Data_Table and Link_Table for different object identifiers.

Traditional method:

The traditional approach is to select the data into a temporary table and then iterate over that table, performing a separate insert operation for each record in Data_Table and Link_Table. While this method works, it has some drawbacks.

Optimization plan:

However, another approach provides a more efficient optimization solution. It uses the function of transactions to insert data into multiple tables at once:

<code class="language-sql">BEGIN TRANSACTION
  DECLARE @DataID int;
  INSERT INTO DataTable (Column1 ...) VALUES (....);
  SELECT @DataID = scope_identity();
  INSERT INTO LinkTable VALUES (@ObjectID, @DataID);
COMMIT</code>

Advantages:

• Reduce the number of lines of code and minimize potential errors.
• Improving performance by eliminating loops and the overhead of creating temporary tables.
• Guarantee the atomicity of the operation, ensuring that both insertion operations succeed or both fail.

Other notes:

• Although this method is executed within a transaction, it still contains two statements.
• You can use a trigger to automatically perform a second insert operation when a record is inserted into Data_Table. However, this strategy may not work in all scenarios.

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