Added dbschema

dbschema/schema.go

@@ -0,0 +1,46 @@
+/*
+Package dbschema is used to keep the SQL schema up to date.
+
+	func sqlProvider(dbName string, version int) (sql []byte, found bool) {
+		// read an SQL file and return the contents
+		return
+	}
+
+	upgrader := dbschema.NewUpgrader()
+	upgrader.SetSqlCallback(sqlProvider)
+
+	if err = upgrader.AddDatabase("127.0.0.1", 5432, "foo", "postgres", "password"); err != nil {
+		panic(err)
+	}
+
+	if err = upgrader.Run(); err != nil {
+		panic(err)
+	}
+*/
+package dbschema
+
+import (
+	// External
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+// An upgrader verifies the schema for one or more databases and upgrades them if possible.
+type Upgrader struct {
+	schema      string
+	databases   map[string]Database
+	logCallback func(string, string)
+	sqlCallback func(string, int) ([]byte, bool)
+}
+
+type Database struct {
+	Host     string
+	Port     int
+	DbName   string
+	Username string
+	Password string
+
+	db       *pgxpool.Pool
+	upgrader *Upgrader
+}
+
+// vim: foldmethod=marker