JDBC学习（四）其他API-优快云博客

1， 在三层架构中，存储过程很少使用，除了在需要利用数据库的一些特性的时候。

<textarea cols="66" rows="15" name="code" class="java"> static void ps() throws SQLException {
Connection conn = null;
CallableStatement cs = null;
ResultSet rs = null;
try {
// 2.建立连接
conn = JdbcUtils.getConnection();
// conn = JdbcUtilsSing.getInstance().getConnection();
// 3.创建语句

String sql = "{ call addUser(?,?,?,?) } ";
cs = conn.prepareCall(sql);
cs.registerOutParameter(4, Types.INTEGER);//第四个参数为输出参数
cs.setString(1, "ps name");
cs.setDate(2, new java.sql.Date(System.currentTimeMillis()));
cs.setFloat(3, 100f);

cs.executeUpdate();

int id = cs.getInt(4);

System.out.println("id=" + id);
} finally {
JdbcUtils.free(rs, cs, conn);
}
}</textarea>


2，DAOFactory的写法：


 <textarea cols="64" rows="15" name="code" class="java">public class DaoFactory {
private static UserDao userDao = null;
private static DaoFactory instance = new DaoFactory();

private DaoFactory() {
try {
Properties prop = new Properties();
InputStream inStream = DaoFactory.class.getClassLoader()
.getResourceAsStream("daoconfig.properties");
prop.load(inStream);
String userDaoClass = prop.getProperty("userDaoClass");
Class clazz = Class.forName(userDaoClass);
userDao = (UserDao) clazz.newInstance();
} catch (Throwable e) {
throw new ExceptionInInitializerError(e);
}
}

public static DaoFactory getInstance() {
return instance;
}

public UserDao getUserDao() {
return userDao;
}
}</textarea>