Fix migrations of Functions

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

@@ -0,0 +1,65 @@
+package fr.postgresjson.migration
+
+import fr.postgresjson.connexion.Connection
+import fr.postgresjson.entity.mutable.Entity
+import fr.postgresjson.migration.Migration.Action
+import java.util.*
+
+data class MigrationScript(
+    val name: String,
+    val up: String,
+    val down: String,
+    private val connection: Connection,
+    override var executedAt: Date? = null
+) : Migration, Entity<String?>(name) {
+    override var doExecute: Action? = null
+
+    override fun up(): Migration.Status {
+        connection.sendQuery(up)
+
+        this::class.java.classLoader.getResource("sql/migration/insertHistory.sql")!!.readText().let {
+            connection.selectOne<MigrationEntity>(it, listOf(name, up, down))?.let { query ->
+                executedAt = query.executedAt
+                doExecute = Action.OK
+            }
+        }
+
+        return Migration.Status.OK
+    }
+
+    override fun down(): Migration.Status {
+        connection.sendQuery(down)
+
+        this::class.java.classLoader.getResource("sql/migration/deleteHistory.sql")!!.readText().let {
+            connection.exec(it, listOf(name))
+        }
+
+        return Migration.Status.OK
+    }
+
+    override fun test(): Migration.Status {
+        connection.inTransaction {
+            up()
+            down()
+            it.sendQuery("ROLLBACK")
+        }.join()
+
+        return Migration.Status.OK // TODO
+    }
+
+    override fun status(): Migration.Status {
+        connection.inTransaction {
+            up()
+            down()
+            it.sendQuery("ROLLBACK")
+        }.join()
+
+        return Migration.Status.OK // TODO
+    }
+
+    fun copy(): MigrationScript {
+        return this.copy(name = name, up = up, down = down, connection = connection, executedAt = executedAt).also {
+            it.doExecute = this.doExecute
+        }
+    }
+}