feature: get migrations from DB

src/main/kotlin/fr/postgresjson/migration/Query.kt

@@ -1,41 +1,51 @@
 package fr.postgresjson.migration
 
 import fr.postgresjson.connexion.Connection
+import fr.postgresjson.entity.Entity
+import java.util.*
 
 class Query(
     val name: String,
     val up: String,
     val down: String,
-    private val connection: Connection
-): Migration {
-    enum class Status(i: Int) { OK(2), UP_FAIL(0), DOWN_FAIL(1) }
-
-    override fun up(): Int {
+    private val connection: Connection,
+    override var executedAt: Date? = null
+): Migration, Entity<String?>(name) {
+    override fun up(): Migration.Status {
         connection.exec(up)
-        return 1
+        // TODO insert to migration Table
+
+        return Migration.Status.OK
     }
 
-    override fun down(): Int {
+    override fun down(): Migration.Status {
         connection.exec(down)
-        return 1
+        // TODO insert to migration Table
+
+        return Migration.Status.OK
     }
 
-    override fun test(): Int {
+    override fun test(): Migration.Status {
         connection.inTransaction {
-            connection.exec(up)
-            connection.exec(down)
+            up()
+            down()
             it.sendQuery("ROLLBACK");
-        }
-        return 1
+        }.join()
+
+        return Migration.Status.OK // TODO
     }
 
-    override fun status(): Int {
+    override fun status(): Migration.Status {
         val result = connection.inTransaction {
-            connection.exec(up)
-            connection.exec(down)
+            up()
+            down()
             it.sendQuery("ROLLBACK")
         }.join()
 
-        return result.rowsAffected.toInt()
+        return Migration.Status.OK // TODO
+    }
+
+    override fun doExecute(): Boolean {
+        return executedAt === null
     }
 }