Created
August 22, 2019 13:52
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pgx postgresql connection example
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package main | |
import ( | |
"log" | |
"time" | |
"github.com/jackc/pgx" | |
) | |
func main() { | |
log.Println("start sample") | |
pgxConfig := pgx.ConnConfig{ | |
Host: "localhost", | |
Database: "quetest", | |
User: "quetest", | |
} | |
pgxConnPoolConfig := pgx.ConnPoolConfig{pgxConfig, 3, nil} | |
conn, err := pgx.NewConnPool(pgxConnPoolConfig) | |
if err != nil { | |
log.Fatal(err) | |
} | |
// declare | |
var i int32 | |
var name string | |
var updatedAt time.Time | |
// select a row | |
err = conn.QueryRow("select id, name from item where id = $1", 2).Scan(&i, &name) | |
if err != nil { | |
log.Fatal(err) | |
} | |
log.Printf("[select a row] id: %d name: %s", i, name) | |
// select rows | |
rows, err := conn.Query("select id, name, updated_at from item") | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer rows.Close() | |
for rows.Next() { | |
if err := rows.Scan(&i, &name, &updatedAt); err != nil { | |
log.Fatal(err) | |
} | |
log.Printf( | |
"[select rows] id: %d name: %s updated: %s", | |
i, name, updatedAt.Format("01/02 15:04:05")) | |
} | |
// update rows in transaction | |
tx, err := conn.Begin() | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer tx.Rollback() | |
res, err := tx.Exec("UPDATE item SET updated_at = $1 WHERE id = $2", time.Now(), 2) | |
if err != nil { | |
log.Fatal(err) | |
} | |
log.Printf("[update a row] updated num rows: %d", res.RowsAffected()) | |
err = conn.QueryRow("select name, updated_at from item where id = $1", 2).Scan(&name, &updatedAt) | |
if err != nil { | |
log.Fatal(err) | |
} | |
log.Printf("[select a row in transaction] name: %s updated: %s", name, updatedAt.Format("01/02 15:04:05")) | |
tx.Commit() | |
err = conn.QueryRow("select name, updated_at from item where id = $1", 2).Scan(&name, &updatedAt) | |
if err != nil { | |
log.Fatal(err) | |
} | |
log.Printf("[select a row] name: %s updated: %s", name, updatedAt.Format("01/02 15:04:05")) | |
} |
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