如何检查结果集是否为空？

SELECT COUNT(*) FROM table_name;

ResultSet resultSet = statement.executeQuery("SELECT * FROM table_name");
if (!resultSet.next()) {
    System.out.println("结果集为空");
}

from sqlalchemy import create_engine, Table, MetaData

engine = create_engine('sqlite:///example.db')
metadata = MetaData()
table = Table('table_name', metadata, autoload_with=engine)

with engine.connect() as connection:
    result = connection.execute(table.select())
    if not result.rowcount:
        print("结果集为空")

try {
    ResultSet resultSet = statement.executeQuery("SELECT * FROM table_name");
    if (!resultSet.next()) {
        System.out.println("结果集为空");
    }
} catch (SQLException e) {
    e.printStackTrace();
}

ResultSet resultSet = statement.executeQuery("SELECT * FROM table_name");
if (!resultSet.next()) {
    System.out.println("结果集为空");
    // 处理结果集为空的情况
} else {
    // 处理结果集不为空的情况
}