Replace JPA with JDBC

src/main/java/polish_community_group_11/polish_community/comments/dao/CommentJdbcRepository.java

+package polish_community_group_11.polish_community.comments.dao;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.RowMapper;
+import org.springframework.stereotype.Repository;
+import polish_community_group_11.polish_community.comments.models.Comment;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+@Repository
+public class CommentJdbcRepository implements CommentRepository {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    @Autowired
+    public CommentJdbcRepository(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
+    public Comment save(Comment comment) {
+        String sql = "INSERT INTO comment (comment_content, user_id, post_title, created_date) VALUES (?, ?, ?, ?)";
+        jdbcTemplate.update(sql,
+                comment.getContent(),
+                comment.getUserId(),
+                comment.getPostTitle(),
+                comment.getCreatedDate()
+        );
+
+        // Retrieve the last inserted ID
+        Integer commentId = jdbcTemplate.queryForObject("SELECT LAST_INSERT_ID()", Integer.class);
+        comment.setId(commentId);
+        return comment;
+    }
+
+    public List<Comment> findByPostTitle(String postTitle) {
+        String sql = "SELECT c.id, c.comment_content, c.user_id, c.post_title, c.created_date, " +
+                "u.fullname as username, u.email as user_email " +
+                "FROM comment c " +
+                "JOIN users u ON c.user_id = u.id " +
+                "WHERE c.post_title = ?";
+
+        return jdbcTemplate.query(sql, new Object[]{postTitle}, new RowMapper<Comment>() {
+            @Override
+            public Comment mapRow(ResultSet rs, int rowNum) throws SQLException {
+                Comment comment = new Comment();
+                comment.setId(rs.getInt("comment_id"));
+                comment.setContent(rs.getString("comment_content"));
+                comment.setUserId(rs.getInt("user_id"));
+                comment.setPostTitle(rs.getString("post_title"));
+                comment.setCreatedDate(rs.getTimestamp("created_date").toLocalDateTime());
+                return comment;
+            }
+        });
+    }
+}
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src/main/java/polish_community_group_11/polish_community/comments/models/CommentResponse.java

+package polish_community_group_11.polish_community.comments.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class CommentResponse {
+    private String content;
+    private String postTitle;
+    private String createdDate;
+    private String username;
+}
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