first handler writing to database

src/udi/database/migrate_database.go

@@ -0,0 +1,55 @@
+package database
+
+import (
+  "log"
+  //"time"
+  "gorm.io/driver/postgres"
+  "gorm.io/gorm"
+)
+
+func Migrate() {
+  dsn := ""
+  db, err := gorm.Open(postgres.Open(dsn))
+  if err != nil {
+    log.Fatalf("Unable to open database connection: %s", err)
+  }
+
+  db.AutoMigrate(&Application{})
+  log.Println("Application created")
+
+  db.AutoMigrate(&DeviceType{})
+  log.Println("DeviceType created")
+
+  db.AutoMigrate(&Device{})
+  log.Println("Device created")
+
+  db.AutoMigrate(&Measurement{})
+  log.Println("Measurement created")
+
+  log.Println("Remember to call create_hypertable on measurements, sowhat I can't do that for you.")
+
+  /*
+  m := Measurement { 
+    Time: time.Now(), 
+    Application: "app", 
+    Attributes: nil,
+    Values: []SensorType {
+      { Variable: "Temperature", Unit: "Degree Celsius", Value: 1.0 },
+      { Variable: "Temperature", Unit: "Degree Celsius", Value: 3.0 },
+    },
+  }
+  db.Create(&m)
+
+  m = Measurement { 
+    Time: time.Now(), 
+    Application: "app", 
+    Attributes: nil,
+    Values: []SensorType {
+      { Variable: "Temperature", Unit: "Degree Celsius", Value: 10.0 },
+      { Variable: "Temperature", Unit: "Degree Celsius", Value: 30.0 },
+    },
+  }
+  db.Create(&m)
+  */
+}
+