How do I import rows to Postgresql from STDIN? [duplicate]

In Go, you can import rows to PostgreSQL from STDIN using the pq package. Here's a step-by-step solution:

Step 1: Prepare the Database Connection

import (
    "database/sql"

    "github.com/lib/pq"
)

db, err := sql.Open("postgres", "dbname=mydb user=myuser password=mypassword")
if err != nil {
    log.Fatalf("open: %v", err)
}

Step 2: Start a Transaction

txn, err := db.Begin()
if err != nil {
    log.Fatalf("begin: %v", err)
}

Step 3: Prepare the Copy Statement

Use pq.CopyIn() to create a prepared statement.

stmt, err := txn.Prepare(pq.CopyIn("test_table", "column1", "column2", ...))
if err != nil {
    log.Fatalf("prepare: %v", err)
}

Step 4: Execute the Copy Statement

Iterate through your data and execute stmt.Exec() for each row.

for _, row := range rows {
    _, err = stmt.Exec(row.Column1, row.Column2, ...)
    if err != nil {
        log.Fatalf("exec: %v", err)
    }
}

Step 5: Execute Final Copy Statement

_, err = stmt.Exec()
if err != nil {
    log.Fatalf("exec: %v", err)
}

Step 6: Close the Statement and Commit the Transaction

stmt.Close()
err = txn.Commit()
if err != nil {
    log.Fatalf("commit: %v", err)
}

This code will efficiently import rows from STDIN to your PostgreSQL table.