Multi-Row Bulk Updates in PostgreSQL with Go
When working with large datasets, it's often necessary to update multiple rows in a database table in a single operation. This can optimize performance and reduce code complexity. In PostgreSQL, bulk updates can be achieved using various approaches.
One approach involves using a derived table to construct a set of values to update. By utilizing the FROM clause, you can specify the values for each row that needs to be updated. For example:
UPDATE t SET column_a = v.column_a, column_b = v.column_b FROM (VALUES (1, 'FINISH', 1234), (2, 'UNFINISH', 3124) ) v(id, column_a, column_b) WHERE v.id = t.id;
The derived table v contains the pairs of (id, column_a, column_b) representing the updates for each row. The UPDATE statement then uses the WHERE clause to match the id values in v with those in the target table t.
In Go, you can execute this query using a prepared statement:
const updateBulkSQL = ` UPDATE t SET column_a = v.column_a, column_b = v.column_b FROM (VALUES (, , ), (, , ) ) v(id, column_a, column_b) WHERE v.id = t.id; ` func main() { db, err := sql.Open("postgres", "") if err != nil { // Handle error } stmt, err := db.Prepare(updateBulkSQL) if err != nil { // Handle error } _, err = stmt.Exec(1, "FINISH", 1234, 2, "UNFINISH", 3124) if err != nil { // Handle error } }
This approach provides a concise and efficient way to perform bulk updates in PostgreSQL, allowing you to update multiple rows in a single query without having to execute separate queries for each row.
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