statement对象

public class JdbcUtils {
    private static String driver=null;
    private static String url=null;
    private static String user=null;
    private static String password=null;
    static {
        try {
            //读取db.properties文件中的数据库连接信息
            InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("db.properties");
            Properties properties = new Properties();
            properties.load(in);
            //获取数据库连接驱动
            driver= properties.getProperty("driver");
            //获取数据库连接url
            url = properties.getProperty("url");
            //获取数据库用户名
            user = properties.getProperty("user");
            //获取数据库密码
            password = properties.getProperty("password");
            //加载数据库驱动
            Class.forName(driver);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //获取数据库连接对象
    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(url,user,password);
    }
    //释放资源，要释放的资源包括Connection数据库连接对象，负责执行SQL命令的Statement 对象，存储查询结果的ResultSet对象
    public static void release(Connection co, Statement st,ResultSet re){
        if(re!=null){
            try {
                re.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
            re=null;
        }
        if(st!=null){
            try {
                st.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if(co!=null){
            try {
                co.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }
}

public class TestInsert {
    public static void main(String[] args) {
        Connection conn=null;
        Statement st = null;
        ResultSet re = null;
        try {
            conn= JdbcUtils.getConnection();
            st = conn.createStatement();
            String sql = "insert into user(id,name,password)" +
                    "values(1,zangzang,123)";
            int i = st.executeUpdate("sql ");
            if(i>0){
                System.out.println("插入成功");
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            //sql执行完成后释放相关资源
            JdbcUtils.release(conn,st,re);
        }
    }
}