时间:2021-07-01 10:21:17 帮助过:37人阅读
if(stm != null){ stm.close(); } if (conn != null){ conn.close(); }
II.对于select(即有查询结果的操作,六个步骤)
1、注册驱动类
Class.forName("oracle.jdbc.driver.OracleDriver");
2、创建连接
String url="jdbc:oracle:thin:@localhost:1521:xe";
Connection conn = DriverManager.getConnection(url,"hr","hr");
3、创建Statement
Statement stm = conn.createStatement();
4、执行SQL语句
sql = "select..."; ResultSet rs = stm.executeQuery(sql);
5、处理查询结果
while(rs.next()){ //获取字段 Xxx x = rs.getXxx("字段名"); Xxx x = rs.getXxx(columnIndex); }
5、释放资源(先创建的后关闭)//先创建的后释放
if(rs != null){ rs.close(); } if(stm != null){ stm.close(); } if (conn != null){ conn.close(); }
JDBC学习笔记(1)
标签:连接数据库 接口 java技术