import mysql.connector

try:
    conn = mysql.connector.connect(
        host="localhost",
        user="haeyul2",
        password="Yx3(Tq!Q5qr9YQer",
        database="haeyul2",
        charset='utf8'
    )
    cursor = conn.cursor(dictionary=True)

    print("=== 1. DB Charset / Collation Info ===")
    cursor.execute("SHOW VARIABLES LIKE 'character_set%';")
    for r in cursor.fetchall():
        print(f"  {r['Variable_name']}: {r['Value']}")

    print("\n=== 2. koweb_blog_section Contents ===")
    cursor.execute("SELECT * FROM koweb_blog_section ORDER BY no ASC;")
    sections = cursor.fetchall()
    for s in sections:
        print(s)

    print("\n=== 3. Total Posts in koweb_blog ===")
    cursor.execute("SELECT COUNT(*) as cnt FROM koweb_blog;")
    print("Total count in koweb_blog:", cursor.fetchone()['cnt'])

    print("\n=== 4. Counts grouped by no_section (JOIN koweb_blog_section s.no) ===")
    cursor.execute('''
        SELECT 
            s.no as sec_no,
            s.title as sec_title,
            COUNT(b.no) as cnt_by_no_section
        FROM koweb_blog_section s
        LEFT JOIN koweb_blog b ON b.no_section = s.no
        GROUP BY s.no, s.title
        ORDER BY s.no ASC;
    ''')
    for r in cursor.fetchall():
        print(r)

    print("\n=== 5. Counts grouped by b.section string column in koweb_blog ===")
    cursor.execute('''
        SELECT 
            section,
            COUNT(*) as cnt_by_section_str
        FROM koweb_blog
        GROUP BY section;
    ''')
    for r in cursor.fetchall():
        print(r)

    print("\n=== 6. Posts where no_section is NULL, 0, or invalid ===")
    cursor.execute('''
        SELECT no, title, section, no_section, reg_date 
        FROM koweb_blog 
        WHERE no_section IS NULL OR no_section = 0 OR no_section NOT IN (SELECT no FROM koweb_blog_section);
    ''')
    orphan_posts = cursor.fetchall()
    print(f"Orphan posts count: {len(orphan_posts)}")
    for p in orphan_posts[:10]:
        print(p)

    print("\n=== 7. Comparing section string vs section ID in koweb_blog ===")
    cursor.execute('''
        SELECT 
            b.no, b.title, b.section as b_section_str, b.no_section, s.title as sec_title_from_id
        FROM koweb_blog b
        LEFT JOIN koweb_blog_section s ON b.no_section = s.no
        WHERE b.section != s.title OR (b.section IS NOT NULL AND s.title IS NULL);
    ''')
    mismatches = cursor.fetchall()
    print(f"Mismatched count: {len(mismatches)}")
    for m in mismatches[:15]:
        print(m)

    cursor.close()
    conn.close()
except Exception as e:
    print("MySQL Error:", e)