Add driver for pgx v5 (#848)

* Add driver for pgx v5

Fixes #827

- Move existing driver into database/pgx/v4
- Make exported items into database/pgx into links to database/pgx/v4,
  marked as Deprecated
- Remove most tests in database/pgx, leaving a couple of e2e tests
  behind to help ensure backwards compatibility.
- Mark defunct ErrDatabaseDirty as Deprecated - no code returns it
- Bump pgx/v4 dependency
- Add test runs for newer Postgres versions

* Tweak pgx tags and registration strings

* Tweak registration strings

Makefile

@@ -1,5 +1,5 @@
 SOURCE ?= file go_bindata github github_ee bitbucket aws_s3 google_cloud_storage godoc_vfs gitlab
-DATABASE ?= postgres mysql redshift cassandra spanner cockroachdb yugabytedb clickhouse mongodb sqlserver firebird neo4j pgx
+DATABASE ?= postgres mysql redshift cassandra spanner cockroachdb yugabytedb clickhouse mongodb sqlserver firebird neo4j pgx pgx5
 DATABASE_TEST ?= $(DATABASE) sqlite sqlite3 sqlcipher
 VERSION ?= $(shell git describe --tags 2>/dev/null | cut -c 2-)
 TEST_FLAGS ?=

README.md

@@ -24,7 +24,8 @@ Forked from [mattes/migrate](https://github.com/mattes/migrate)
 Database drivers run migrations. [Add a new database?](database/driver.go)
 
 * [PostgreSQL](database/postgres)
-* [PGX](database/pgx)
+* [PGX v4](database/pgx)
+* [PGX v5](database/pgx/v5)
 * [Redshift](database/redshift)
 * [Ql](database/ql)
 * [Cassandra](database/cassandra)

database/pgx/README.md

@@ -1,5 +1,7 @@
 # pgx
 
+This package is for [pgx/v4](https://pkg.go.dev/github.com/jackc/pgx/v4). A backend for the newer [pgx/v5](https://pkg.go.dev/github.com/jackc/pgx/v5) is [also available](v5).
+
 `pgx://user:password@host:port/dbname?query`
 
 | URL Query  | WithInstance Config | Description |

database/pgx/pgx.go

@@ -28,6 +28,7 @@ import (
 func init() {
 	db := Postgres{}
 	database.Register("pgx", &db)
+	database.Register("pgx4", &db)
 }
 
 var (
@@ -150,7 +151,7 @@ func (p *Postgres) Open(url string) (database.Driver, error) {
 	// i.e. pgx://user:password@host:port/db => postgres://user:password@host:port/db
 	purl.Scheme = "postgres"
 
-	db, err := sql.Open("pgx", migrate.FilterCustomQuery(purl).String())
+	db, err := sql.Open("pgx/v4", migrate.FilterCustomQuery(purl).String())
 	if err != nil {
 		return nil, err
 	}

database/pgx/pgx_test.go

@@ -8,19 +8,17 @@ import (
 	sqldriver "database/sql/driver"
 	"errors"
 	"fmt"
-	"log"
-
 	"io"
+	"log"
 	"strconv"
 	"strings"
 	"sync"
 	"testing"
 
-	"github.com/golang-migrate/migrate/v4"
-
 	"github.com/dhui/dktest"
-
+	"github.com/golang-migrate/migrate/v4"
 	"github.com/golang-migrate/migrate/v4/database"
+
 	dt "github.com/golang-migrate/migrate/v4/database/testing"
 	"github.com/golang-migrate/migrate/v4/dktesting"
 	_ "github.com/golang-migrate/migrate/v4/source/file"
@@ -41,6 +39,9 @@ var (
 		{ImageName: "postgres:10", Options: opts},
 		{ImageName: "postgres:11", Options: opts},
 		{ImageName: "postgres:12", Options: opts},
+		{ImageName: "postgres:13", Options: opts},
+		{ImageName: "postgres:14", Options: opts},
+		{ImageName: "postgres:15", Options: opts},
 	}
 )
 

database/pgx/v5/README.md

@@ -0,0 +1,41 @@
+# pgx
+
+This package is for [pgx/v5](https://pkg.go.dev/github.com/jackc/pgx/v5). A backend for the older [pgx/v4](https://pkg.go.dev/github.com/jackc/pgx/v4). is [also available](..).
+
+`pgx://user:password@host:port/dbname?query`
+
+| URL Query  | WithInstance Config | Description |
+|------------|---------------------|-------------|
+| `x-migrations-table` | `MigrationsTable` | Name of the migrations table |
+| `x-migrations-table-quoted` | `MigrationsTableQuoted` | By default, migrate quotes the migration table for SQL injection safety reasons. This option disable quoting and naively checks that you have quoted the migration table name. e.g. `"my_schema"."schema_migrations"` |
+| `x-statement-timeout` | `StatementTimeout` | Abort any statement that takes more than the specified number of milliseconds |
+| `x-multi-statement` | `MultiStatementEnabled` | Enable multi-statement execution (default: false) |
+| `x-multi-statement-max-size` | `MultiStatementMaxSize` | Maximum size of single statement in bytes (default: 10MB) |
+| `dbname` | `DatabaseName` | The name of the database to connect to |
+| `search_path` | | This variable specifies the order in which schemas are searched when an object is referenced by a simple name with no schema specified. |
+| `user` | | The user to sign in as |
+| `password` | | The user's password |
+| `host` | | The host to connect to. Values that start with / are for unix domain sockets. (default is localhost) |
+| `port` | | The port to bind to. (default is 5432) |
+| `fallback_application_name` | | An application_name to fall back to if one isn't provided. |
+| `connect_timeout` | | Maximum wait for connection, in seconds. Zero or not specified means wait indefinitely. |
+| `sslcert` | | Cert file location. The file must contain PEM encoded data. |
+| `sslkey` | | Key file location. The file must contain PEM encoded data. |
+| `sslrootcert` | | The location of the root certificate file. The file must contain PEM encoded data. |
+| `sslmode` | | Whether or not to use SSL (disable\|require\|verify-ca\|verify-full) |
+
+
+## Upgrading from v1
+
+1. Write down the current migration version from schema_migrations
+1. `DROP TABLE schema_migrations`
+2. Wrap your existing migrations in transactions ([BEGIN/COMMIT](https://www.postgresql.org/docs/current/static/transaction-iso.html)) if you use multiple statements within one migration.
+3. Download and install the latest migrate version.
+4. Force the current migration version with `migrate force <current_version>`.
+
+## Multi-statement mode
+
+In PostgreSQL running multiple SQL statements in one `Exec` executes them inside a transaction. Sometimes this
+behavior is not desirable because some statements can be only run outside of transaction (e.g.
+`CREATE INDEX CONCURRENTLY`). If you want to use `CREATE INDEX CONCURRENTLY` without activating multi-statement mode
+you have to put such statements in a separate migration files.