Update links and timestamp on multiple link accesses

SpigotCore_Main/src/de/steamwar/sql/DownloadSchematic.java

@@ -23,8 +23,6 @@ import com.google.common.io.BaseEncoding;
 
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
-import java.sql.ResultSet;
-import java.sql.SQLException;
 import java.time.Instant;
 
 public class DownloadSchematic {
@@ -33,14 +31,6 @@ public class DownloadSchematic {
     private static final String BASE = "https://steamwar.de/download.php?schem=";
 
     public static String getLink(Schematic schem){
-        ResultSet rs = SQL.select("SELECT * FROM SchemDownload WHERE SchemID = ?", schem.getSchemID());
-        try {
-            if(rs.next())
-                return BASE + rs.getString("Link");
-        } catch (SQLException e) {
-            throw new SecurityException("Could not check schematic for existance", e);
-        }
-
         MessageDigest cript;
         try {
             cript = MessageDigest.getInstance("SHA-1");
@@ -50,7 +40,7 @@ public class DownloadSchematic {
         cript.reset();
         cript.update((Instant.now().toString() + schem.getSchemOwner() + schem.getSchemID()).getBytes());
         String hash = BaseEncoding.base16().encode(cript.digest());
-        SQL.update("INSERT INTO SchemDownload (SchemID, Link) VALUES (?, ?)", schem.getSchemID(), hash);
+        SQL.update("INSERT INTO SchemDownload (SchemID, Link) VALUES (?, ?) ON DUPLICATE KEY UPDATE Link = VALUES(Link)", schem.getSchemID(), hash);
         return BASE + hash;
     }
 }