diff --git a/src/main/kotlin/service/LibraryService.kt b/src/main/kotlin/service/LibraryService.kt
index 59cda37..2a1fafd 100644
--- a/src/main/kotlin/service/LibraryService.kt
+++ b/src/main/kotlin/service/LibraryService.kt
@@ -11,12 +11,11 @@ class LibraryService(private val connection: Connection) {
     companion object {
         private const val SELECT_LIBRARY_BY_ID = "SELECT * FROM library WHERE  id = ?"
         private const val SELECT_ALL_LIBRARIES = "SELECT * FROM library"
-        private const val SELECT_LIBRARY_ALL = "SELECT * FROM library ORDER BY id DESC LIMIT 25"
         private const val INSERT_LIBRARY = "INSERT INTO library (name, address, is_archived) VALUES (?, ?, ?)"
-        private const val UPDATE_LIBRARY_BY_ID = ""
+        private const val UPDATE_LIBRARY_BY_ID = "UPDATE library SET name = ?, address = ? WHERE id = ?"
         // In the event  are "deleted" erroneously, having a flag set instead of actually removing the entry allows
         // for quick reversal.
-        private const val ARCHIVE_LIBRARY_BY_ID = ""
+        private const val ARCHIVE_LIBRARY_BY_ID = "UPDATE library SET is_archived = true WHERE id = ?"
     }
 
     suspend fun create(library: NewLibrary): Long {
@@ -64,11 +63,32 @@ class LibraryService(private val connection: Connection) {
         return libraries
     }
 
-    suspend fun update(library: Library) {}
+    suspend fun update(library: Library): Library {
+        val statement = connection.prepareStatement(UPDATE_LIBRARY_BY_ID)
+        try {
+            statement.setString(1, library.name)
+            statement.setString(2, library.address)
+            statement.setLong(3, library.id)
+            statement.execute()
+            return readLibraryById(library.id)
+        } catch (e: SQLException) {
+            throw DbElementInsertionException("${e.message}\ncollectionItem: $library\n statement: $statement\n ", e)
+        } catch (e: IllegalArgumentException) {
+            throw DbElementInsertionException("${e.message}\ncollectionItem: $library\n statement: $statement\n ", e)
+        }
+    }
 
-    suspend fun delete(id: String) {}
+    suspend fun delete(id: Long) {
+        val statement = connection.prepareStatement(ARCHIVE_LIBRARY_BY_ID)
+        try {
+            statement.setLong(1, id)
+            statement.execute()
+        } catch (e: SQLException) {
+            throw DbElementNotFoundException("Could not find Library with id $id")
+        }
+    }
 
-    fun createLibraryFromResult(resultSet: ResultSet): Library {
+    private fun createLibraryFromResult(resultSet: ResultSet): Library {
         try {
             val id = resultSet.getLong("id")
             val name = resultSet.getString("name")