Java 连接 Oracle
1. 建立驱动
2. 连接数据库
3. 发送sql语句
4. 关闭连接

try {      // 1. 建立驱动        Class.forName (DBDRIVER);            // 2. 连接数据库         conn = DriverManager.getConnection (DBURL, DBUSER, DBPASS);            String sql = "SELECT userid, name FROM tuser WHERE userid=? AND pass=?";      pstmt = conn.prepareStatement (sql);      pstmt.setString (1, userid);      pstmt.setString (2, password);            // 3. 发送sql语句         rs = pstmt.executeQuery();      if (rs.next()) {          flag = true;      }    } catch (Exception e) {    } finally {        // 4. 关闭连接        try {          rs.close(); pstmt.close();         conn.close();        } catch (Exception e) {}    }