PostgreSQLのデータベースにxlsxファイルをインポートする

import openpyxl as xl
import psycopg2 as pg

# DBにインポートするxlsxファイルの読み込み
import_file_path = 'ファイルパス'
wb = xl.load_workbook(import_file_path, data_only=True)

# ExcelシートとDBテーブルの対応付け
tables_json = {
    'Sheet1': {
        'min_row': 2,
        'table_name': 'dummy_table_name',
        'column': {
            'name': {'type': 'text', 'index': 1},
            'age': {'type': 'int', 'index': 2},
        }
    }
}

# DB接続の開始
conn_param = {
    'user': 'user_name',
    'password': 'pw',
    'host': 'localhost', 
    'port': '5432', 
    'dbname': 'testdb'
}

with pg.connect(**conn_param) as conn:
    with conn.cursor() as cur:
        for ws_name in tables_json:
            ws = wb[ws_name]
            tbl = tables_json[ws_name]
        
        table_name = tbl['table_name']
        min_row = tbl['min_row']
        col_label = []
        col_name = []
        col_index = []
        
        for k, v in tbl['column'].items():
            col_label.append(f"{k} {v['type']}")
            col_name.append(k)
            col_index.append(v['index'])
        
        col_label = ','.join(col_label)
        col_name = ','.join(col_name)
        
        cur.execute(f'DROP TABLE IF EXISTS {table_name}')
        cur.execute(f'CREATE TABLE {table_name}({col_label})')
        
        for r in ws.iter_rows(min_row=min_row):
            fields = []
            if r[0].value is None:
                break
            for i in col_index:
                val = r[i - 1].value
                if type(val) is str or type(val) is int:
                    fields.append(val)
                else:
                    fields.append(str(val))
            place_holder = ','.join(['%s' for _ in range(len(fields))])
            sql = f'INSERT INTO {table_name} ({col_name}) VALUES({place_holder})'
            cur.execute(sql, tuple(fields))
        
        conn.commit()