JAVA连接ORACLE数据库方法及测试

import java.sql.*; public class Bc { // 声明数据库地址及驱动 private Connection conn = null; private String url = "jdbc:oracle:thin:@localhost:1521:ORCL"; private String driver = "oracle.jdbc.driver.OracleDriver"; private String user = "www"; private String password = "www"; // 主函数 public static void main(String[] args) { Bc bc = new Bc(); String sql="select * from T_USERS"; String sql1 = "insert into T_USERS values ('rrr','ooo')"; String sql2 ="update T_USERS set USERSPASSWORD = '888888888884444' where USERSNAME= 'www'"; ResultSet rs= bc.select(sql); bc.execute(sql1); bc.execute(sql2); try{ //显示查询出来的结果------------------ ResultSetMetaData rmeta = rs.getMetaData(); //获得数据字段个数 int numColumns = rmeta.getColumnCount(); while(rs.next()) { for(int i = 0;i< numColumns;i++) { String sTemp = rs.getString(i+1); System.out.print(sTemp+" "); } System.out.println(""); } } catch (Exception e) { // TODO: handle exception } } // 创建数据库连接方法 public Connection create() { try { /* 使用Class.forName()方法自动创建这个驱动程序的实例且自动调用DriverManager来注册它 */ Class.forName(driver); /* 通过DriverManager的getConnection()方法获取数据库连接 */ conn = DriverManager.getConnection(url, user, password); } catch (Exception ex) { System.out.println("数据库连接出错"); } return conn; } // 执行查询时用的方法 public ResultSet select(String sql) { Connection c = create();//获取连接对象,可以不声明 ResultSet rs = null; try { Statement st = c.createStatement();// 获取Staetment对象 rs = st.executeQuery(sql);// 执行操作 } catch (Exception e) { System.out.println("查询出错"); } return rs; } // 更新方法 public void execute(String sql) { Connection c = create();//获取连接对象,可以不声明 ResultSet rs = null; try { Statement st = c.createStatement();// 获取Staetment对象 st.executeUpdate(sql); } catch (Exception e) { System.out.println("更新出错"); } } }