begin implementing m3u loading into database

src/main/java/com/mykola2312/mptv/db/M3ULoader.java

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+package com.mykola2312.mptv.db;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+import org.jooq.*;
+import org.jooq.impl.*;
+import static com.mykola2312.mptv.tables.Category.*;
+
+import com.mykola2312.mptv.db.pojo.Category;
+import com.mykola2312.mptv.parser.M3U;
+
+public class M3ULoader {
+    public static void loadAll(ArrayList<M3U> items) {
+        // cache categories' ids
+        HashMap<String, Integer> categories = new HashMap<>();
+        for (M3U item : items) {
+            // category
+            if (item.groupTitle != null) {
+                Integer id;
+                Category category = DSL.using(DB.CONFIG)
+                    .select()
+                    .from(CATEGORY)
+                    .where(CATEGORY.TITLE.eq(item.groupTitle))
+                    .limit(1)
+                    .fetchOne()
+                    .into(Category.class);
+                if (category == null) {
+                    id = DSL.using(DB.CONFIG)
+                        .insertInto(CATEGORY, CATEGORY.TITLE)
+                        .values(item.groupTitle)
+                        .returningResult(CATEGORY.ID)
+                        .fetchOne()
+                        .into(Integer.class);
+                } else {
+                    id = category.id;
+                }
+
+                categories.put(item.groupTitle, id);
+            }
+
+            // channel
+        }
+    }
+}

src/main/java/com/mykola2312/mptv/db/pojo/Category.java

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+package com.mykola2312.mptv.db.pojo;
+
+import jakarta.persistence.Column;
+
+public class Category {
+    @Column(name = "ID")
+    public int id;
+
+    @Column(name = "TITLE")
+    public String title;
+}

src/main/java/com/mykola2312/mptv/db/pojo/Channel.java

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+package com.mykola2312.mptv.db.pojo;
+
+import jakarta.persistence.Column;
+
+public class Channel {
+    @Column(name = "ID")
+    public int id;
+
+    @Column(name = "CATEGORY")
+    public int category;
+
+    @Column(name = "TITLE")
+    public String title;
+
+    @Column(name = "URL")
+    public String url;
+
+    @Column(name = "LOGO")
+    public String logo;
+}