java 使用 mysql

首先下载mysql的jdbc驱动。

然后新建一个Datamanager类：

public class MysqlManager extends DataManager {

static private final MysqlManager MYSQL = new MysqlManager();
static private final String URL ="jdbc:mysql://localhost:3306/test";

    static private final String DRIVER = "com.mysql.jdbc.Driver";

    private final String userName ="root";

    private final String password="root";
/**数据库操作对象**/

    Statement m_readStm = null;

    Connection m_con = null;
static public MysqlManager getInstance(){

        return MYSQL;

    }
private MysqlManager(){

        try {

            Class.forName(DRIVER);// 加载Mysql数据驱动
m_con = DriverManager.getConnection(URL, userName, password);// 创建数据连接

            //创建数据库读取状态

            m_readStm = m_con.createStatement(

                    ResultSet.TYPE_SCROLL_INSENSITIVE,

                    ResultSet.CONCUR_READ_ONLY);

        }catch (ClassNotFoundException | SQLException e ) {

            System.err.println("数据库连接失败!  " + e.getMessage());

        }

    }
}

还需要添加一个close函数，用于关闭数据库链接。

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