fixed database table creation

src/main/java/de/srsoftware/widerhall/data/User.java

@@ -13,10 +13,11 @@ import java.util.List;
 import java.util.Map;
 
 import static de.srsoftware.widerhall.data.Database.*;
+import static de.srsoftware.widerhall.Constants.*;
 
 public class User {
+    public static final String TABLE_NAME = "Users";
     private static final Logger LOG = LoggerFactory.getLogger(User.class);
-    private static Database database = Database.open();
     private String email, salt, hashedPass, name;
 
     public User(String email, String name, String salt, String hashedPass) {
@@ -32,7 +33,17 @@ public class User {
         return new User(email,name,salt,hashedPass).save();
     }
 
-
+    public static void createTable() throws SQLException {
+        var sql = new StringBuilder()
+                .append("CREATE TABLE ").append(TABLE_NAME)
+                .append(" (")
+                .append(EMAIL).append(" ").append(VARCHAR).append(" NOT NULL PRIMARY KEY, ")
+                .append(SALT).append(" ").append(VARCHAR).append(", ")
+                .append(HASHED_PASS).append(" ").append(VARCHAR).append(", ")
+                .append(NAME).append(" ").append(VARCHAR)
+                .append(");");
+        Database.open().query(sql.toString()).run();
+    }
 
     public String email() {
         return email;
@@ -51,7 +62,7 @@ public class User {
     public static List<User> list() {
         var userList = new ArrayList<User>();
         try {
-            var rs = database.query("SELECT * FROM Users").exec();
+            var rs = Database.open().query("SELECT * FROM Users").exec();
             while (rs.next()){
                 var email = rs.getString(EMAIL);
                 var name = rs.getString(NAME);
@@ -66,7 +77,7 @@ public class User {
     }
 
     public static User load(String email, String password) throws InvalidKeyException, SQLException {
-        ResultSet rs = database
+        ResultSet rs = Database.open()
                 .query("SELECT * FROM Users")
                 .where(EMAIL,email)
                 .exec();
@@ -102,7 +113,7 @@ public class User {
     }
 
     public static boolean noUsers() throws SQLException {
-        var rs = database.query("SELECT count(*) FROM users").exec();
+        var rs = Database.open().query("SELECT count(*) FROM users").exec();
         try {
             if (rs.next()) {
                 return rs.getInt(1) < 1;
@@ -114,7 +125,7 @@ public class User {
     }
 
     private User save() throws SQLException {
-        database.insertInto("Users")
+        Database.open().insertInto(TABLE_NAME)
                 .values(Map.of(EMAIL,email,NAME,name,SALT,salt,HASHED_PASS,hashedPass))
                 .run();
         return this;