add: add function about users

Author: Mryan2005

.idea/encodings.xml

@@ -4,7 +4,6 @@
 import org.apache.commons.codec.digest.DigestUtils;
 
 import java.io.UnsupportedEncodingException;
-import java.nio.charset.StandardCharsets;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.HashMap;

src/main/java/top/mryan2005/managesysteminjava/BasicClass/LoginPart.java

@@ -0,0 +1,55 @@
+package top.mryan2005.managesysteminjava.BasicClass;
+
+import top.mryan2005.managesysteminjava.SQLs.SQLLinker;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.HashMap;
+
+public class UserGroup {
+    public final HashMap<String, Integer> userGroup = new HashMap<>();
+
+    public final void getCurrentGroup(SQLLinker sql) {
+        try {
+            ResultSet res = sql.runSQL("SELECT * FROM Users.[permission]");
+            if (res != null) {
+                while (res.next()) {
+                    userGroup.put(res.getString("permissionName"), res.getInt("id"));
+                }
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public final int getGroupID(String groupName) {
+        return userGroup.get(groupName);
+    }
+
+    public final String getGroupName(int groupID) {
+        for (String key : userGroup.keySet()) {
+            if (userGroup.get(key) == groupID) {
+                return key;
+            }
+        }
+        return null;
+    }
+
+    public final String addGroup(String groupName, int groupID, SQLLinker sql) {
+        if(userGroup.containsKey(groupName)) {
+            return "Group name already exists!";
+        }
+        userGroup.put(groupName, groupID);
+        sql.runSQL("INSERT INTO Users.[permission] (permissionName, id) VALUES ('" + groupName + "', " + groupID + ")");
+        return "Group added successfully!";
+    }
+
+    public final String removeGroup(String groupName, SQLLinker sql) {
+        if(!userGroup.containsKey(groupName)) {
+            return "Group name does not exist!";
+        }
+        userGroup.remove(groupName);
+        sql.runSQL("DELETE FROM Users.[permission] WHERE permissionName = '" + groupName + "'");
+        return "Group removed successfully!";
+    }
+}

src/main/java/top/mryan2005/managesysteminjava/BasicClass/UserGroup.java

@@ -0,0 +1,4 @@
+package top.mryan2005.managesysteminjava.BasicClass;
+
+public class UserManager {
+}