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Update for pgx v5

Jack Christensen 2022-09-17 08:35:09 -05:00
parent a755e2bf65
commit 3dd765f1e8
1 changed files with 15 additions and 9 deletions
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24
Getting-started-with-pgx.md

@ -8,10 +8,10 @@ pgx requires a recent version of Go with module support. Use the `go version` co
``` ```
$ go version $ go version
go version go1.16.4 darwin/amd64 go version go1.19.1 darwin/amd64
``` ```
The version should be at least 1.15. The version should be at least 1.18.
pgx also requires a PostgreSQL database that is accessible from your host. Use `psql` to test your connection. pgx also requires a PostgreSQL database that is accessible from your host. Use `psql` to test your connection.
@ -20,7 +20,7 @@ $ psql
Timing is on. Timing is on.
Null display is "∅". Null display is "∅".
Line style is unicode. Line style is unicode.
psql (12.3) psql (14.5 (Homebrew))
Type "help" for help. Type "help" for help.
jack@[local]:5432 jack=# jack@[local]:5432 jack=#
@ -47,8 +47,8 @@ go: creating new go.mod: module hello
Add pgx to your Go modules: Add pgx to your Go modules:
``` ```
$ go get github.com/jackc/pgx/v4 $ go get github.com/jackc/pgx/v5
go get: added github.com/jackc/pgx/v4 v4.11.0
``` ```
## Hello world from PostgreSQL ## Hello world from PostgreSQL
@ -98,7 +98,13 @@ Hello, world!
## Using a Connection Pool ## Using a Connection Pool
The `*pgx.Conn` returned by `pgx.Connect()` represents a single connection and is not concurrency safe. This is entirely appropriate for a simple command line example such as above. However, for many uses, such as a web application server, concurrency is required. To use a connection pool replace the import `github.com/jackc/pgx/v4` with `github.com/jackc/pgx/v4/pgxpool` and connect with `pgxpool.Connect()` instead of `pgx.Connect()`. The `*pgx.Conn` returned by `pgx.Connect()` represents a single connection and is not concurrency safe. This is entirely appropriate for a simple command line example such as above. However, for many uses, such as a web application server, concurrency is required. To use a connection pool replace the import `github.com/jackc/pgx/v5` with `github.com/jackc/pgx/v5/pgxpool` and connect with `pgxpool.Connect()` instead of `pgx.Connect()`.
You may need to run `go get` for the `pgxpool` package.
```
$ go get github.com/jackc/pgx/v5/pgxpool
```
Here is the same program using the connection pool. Here is the same program using the connection pool.
@ -110,13 +116,13 @@ import (
"fmt" "fmt"
"os" "os"
"github.com/jackc/pgx/v4/pgxpool" "github.com/jackc/pgx/v5/pgxpool"
) )
func main() { func main() {
dbpool, err := pgxpool.Connect(context.Background(), os.Getenv("DATABASE_URL")) dbpool, err := pgxpool.New(context.Background(), os.Getenv("DATABASE_URL"))
if err != nil { if err != nil {
fmt.Fprintf(os.Stderr, "Unable to connect to database: %v\n", err) fmt.Fprintf(os.Stderr, "Unable to create connection pool: %v\n", err)
os.Exit(1) os.Exit(1)
} }
defer dbpool.Close() defer dbpool.Close()