java连接oracle的简单实例
连接oracle的时候，要导入oracle驱动的jar包。
连接的时候，有statement和preparedstatement两种，从代码中可以看出不同。
example:
1 package com.jdbc.oracle; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.PreparedStatement; 6 import java.sql.ResultSet; 7 import java.sql.SQLException; 8 import java.sql.Statement; 9 10 public class cn1 { 11 12 /** 13 * @param args 14 */ 15 public static void main(String[] args) { 16 Connection conn = null; 17 //Statement stmt = null; 18 PreparedStatement ps = null; 19 ResultSet rs = null; 20 int rowcount = 0; 21 22 try { 23 //注册数据库驱动程序为Oracle驱动 24 Class.forName("oracle.jdbc.driver.OracleDriver"); 25 } catch (ClassNotFoundException e) { 26 //这样写是为了方便调试程序，出错打印mydb()就知道在什么地方出错了 27 e.printStackTrace(); 28 System.err.println("mydb(): " + e.getMessage()); 29 } 30 31 try { 32 conn = DriverManager.getConnection("jdbc:oracle:thin:@172.21.1.11:1524:vasd", "chnlmgr", "chnlmgr"); 33 } catch (SQLException e) { 34 System.err.println("conn:"+e.getMessage()); 35 } 36 37 if (conn != null) { 38 System.out.println("connection successful"); 39 } else { 40 System.out.println("connection failure"); 41 } 42 43 /* 44 try { 45 stmt = conn.createStatement(); 46 } catch (SQLException e) { 47 e.printStackTrace(); 48 }*/ 49 50 try { 51 //rs = stmt.executeQuery("select * from PO_USER_BASE_INFO where username='guojing'"); 52 StringBuffer sql = new StringBuffer(); 53 sql.append("select * from PO_USER_BASE_INFO where "); 54 sql.append("username = ?"); 55 ps = conn.prepareStatement(sql.toString()); 56 ps.setString(1, "guojing"); 57 rs = ps.executeQuery(); 58 while (rs.next()) { 59 System.out.println(rs.getString("USERNAME")); 60 } 61 62 rs.close(); 63 //stmt.close(); 64 ps.close(); 65 conn.close(); 66 } catch (SQLException e) { 67 e.printStackTrace(); 68 } 69 70 } 71 }
