Fixed no row-error

database.go

@@ -1,8 +1,11 @@
 package dbschema
 
 import (
+	// External
+	"github.com/jackc/pgx/v5/pgxpool"
+
 	// Standard
-	"database/sql"
+	"context"
 	"fmt"
 )
 
@@ -13,10 +16,10 @@ func newDatabase(host string, port int, dbName, user, pass string) (dbase Databa
 	dbase.Username = user
 	dbase.Password = pass
 
-	dbase.db, err = sql.Open("postgres", dbase.sqlConnString())
+	dbase.db, err = pgxpool.New(context.Background(), dbase.sqlConnString())
 	return
 }// }}}
-func databaseFromInstance(db *sql.DB) (dbase Database, err error) {
+func databaseFromInstance(db *pgxpool.Pool) (dbase Database, err error) {
 	dbase.db = db
 	return
 }

schema.go

@@ -21,10 +21,7 @@ package dbschema
 
 import (
 	// External
-	_ "github.com/lib/pq"
-
-	// Standard
-	"database/sql"
+	"github.com/jackc/pgx/v5/pgxpool"
 )
 
 // An upgrader verifies the schema for one or more databases and upgrades them if possible.
@@ -42,7 +39,7 @@ type Database struct {
 	Username string
 	Password string
 
-	db       *sql.DB
+	db       *pgxpool.Pool
 	upgrader *Upgrader
 }
 

upgrader.go

@@ -2,10 +2,12 @@ package dbschema
 
 import (
 	// External
-	"github.com/lib/pq"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
 
 	// Standard
-	"database/sql"
+	"context"
 	"fmt"
 )
 
@@ -49,17 +51,18 @@ func (upgrader *Upgrader) Version(dbName string) (version int, err error) {// {{
 
 func (dbase Database) createSchemaTable() (err error) { // {{{
 	dbase.upgrader.logCallback("create", fmt.Sprintf("%s, %s.schema", dbase.DbName, dbase.upgrader.schema))
-	_, err = dbase.db.Exec(`CREATE SCHEMA "`+dbase.upgrader.schema+`"`)
+	_, err = dbase.db.Exec(context.Background(), `CREATE SCHEMA "` + dbase.upgrader.schema + `"`)
 
 	// Error code 42P06 "duplicate_schema" is an OK error,
 	// table can still be missing and created.
-	pqErr, _ := err.(*pq.Error)
+	pqErr, _ := err.(*pgconn.PgError)
 	if pqErr != nil && pqErr.Code != "42P06" {
 		return
 	}
 
-	_, err = dbase.db.Exec(`
-		CREATE TABLE "`+dbase.upgrader.schema+`"."schema" (
+	_, err = dbase.db.Exec(
+		context.Background(),
+		`CREATE TABLE "` + dbase.upgrader.schema + `"."schema" (
 			version  int4      NOT NULL,
 			updated  timestamp NOT NULL DEFAULT NOW(),
 
@@ -69,13 +72,14 @@ func (dbase Database) createSchemaTable() (err error) {// {{{
 	return
 } // }}}
 func (dbase Database) appendSchemaVersion(version int) (err error) { // {{{
-	_, err = dbase.db.Exec(`INSERT INTO `+dbase.upgrader.schema+`.schema(version) VALUES($1)`, version)
+	_, err = dbase.db.Exec(context.Background(), `INSERT INTO `+dbase.upgrader.schema+`.schema(version) VALUES($1)`, version)
 	return
 } // }}}
 
 func (dbase Database) verifySchemaTable() (err error) { // {{{
-	var rows *sql.Rows
+	var rows pgx.Rows
 	if rows, err = dbase.db.Query(
+		context.Background(),
 		`SELECT EXISTS (
 			SELECT FROM pg_catalog.pg_class c
 			JOIN   pg_catalog.pg_namespace n ON n.oid = c.relnamespace
@@ -100,11 +104,11 @@ func (dbase Database) verifySchemaTable() (err error) {// {{{
 } // }}}
 func (dbase Database) verifySchemaEntry() (err error) { // {{{
 	var version int
-	var row *sql.Row
-	row = dbase.db.QueryRow(`SELECT version FROM `+dbase.upgrader.schema+`.schema LIMIT 1`)
+	var row pgx.Row
+	row = dbase.db.QueryRow(context.Background(), `SELECT version FROM `+dbase.upgrader.schema+`.schema LIMIT 1`)
 
 	err = row.Scan(&version)
-	if err == sql.ErrNoRows {
+	if err == pgx.ErrNoRows {
 		dbase.upgrader.logCallback("initiate version", dbase.DbName)
 		err = dbase.appendSchemaVersion(0)
 	}
@@ -112,8 +116,9 @@ func (dbase Database) verifySchemaEntry() (err error) {// {{{
 	return
 } // }}}
 func (dbase Database) Version() (version int, err error) { // {{{
-	var rows *sql.Rows
+	var rows pgx.Rows
 	rows, err = dbase.db.Query(
+		context.Background(),
 		`SELECT version FROM ` + dbase.upgrader.schema + `.schema ORDER BY version DESC LIMIT 1`,
 	)
 	if err != nil {
@@ -145,8 +150,19 @@ func (upgrader Upgrader) AddDatabase(host string, port int, dbName, user, pass s
 	err = db.verifySchemaEntry()
 	return
 } // }}}
-func (upgrader Upgrader) AddDatabaseInstance(sqlDB *sql.DB) (db Database, err error) {// {{{
-	return databaseFromInstance(sqlDB)
+func (upgrader Upgrader) AddDatabaseInstance(sqlDB *pgxpool.Pool, dbName string) (db Database, err error) { // {{{
+	db, err = databaseFromInstance(sqlDB)
+
+	db.upgrader = &upgrader
+
+	upgrader.databases[dbName] = db
+
+	if err = db.verifySchemaTable(); err != nil {
+		return
+	}
+
+	err = db.verifySchemaEntry()
+	return
 } // }}}
 
 // Run executes the actual schema updates until there are no more available.
@@ -168,7 +184,7 @@ func (upgrader Upgrader) Run() (err error) {// {{{
 			}
 
 			upgrader.logCallback("exec", fmt.Sprintf("%s.%s: %d", dbName, upgrader.schema, version))
-			if _, err = dbase.db.Exec(string(sql)); err != nil {
+			if _, err = dbase.db.Exec(context.Background(), string(sql)); err != nil {
 				return
 			}
 			if err = dbase.appendSchemaVersion(version); err != nil {