java获取mysql条数

String sql = "SELECT COUNT(*) FROM table_name";

String sql = "SELECT COUNT(*) FROM table_name WHERE condition";

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class MySQLCountExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/database_name";
        String username = "your_username";
        String password = "your_password";
        String sql = "SELECT COUNT(*) FROM table_name";

        try (Connection conn = DriverManager.getConnection(url, username, password);
             Statement stmt = conn.createStatement();
             ResultSet rs = stmt.executeQuery(sql)) {

            if (rs.next()) {
                int count = rs.getInt(1);
                System.out.println("Total records: " + count);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}