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:

 package com.jdbc.oracle;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;

 public class cn1 {

     /**
      * @param args
      */
     public static void main(String[] args) {
         Connection conn = null;
         //Statement stmt = null;
         PreparedStatement ps = null;
         ResultSet rs = null;
         int rowcount = 0;

         try {
             //注册数据库驱动程序为Oracle驱动
             Class.forName("oracle.jdbc.driver.OracleDriver");
         } catch (ClassNotFoundException e) {
             //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
             e.printStackTrace();
             System.err.println("mydb(): " + e.getMessage());
         }

         try {
             conn = DriverManager.getConnection("jdbc:oracle:thin:@172.21.1.11:1524:vasd", "chnlmgr", "chnlmgr");
         } catch (SQLException e) {
             System.err.println("conn:"+e.getMessage());
         }

         if (conn != null) {
             System.out.println("connection successful");
         } else {
             System.out.println("connection failure");
         }

         /*
         try {
             stmt = conn.createStatement();
         } catch (SQLException e) {
             e.printStackTrace();
         }*/

         try {
             //rs = stmt.executeQuery("select * from PO_USER_BASE_INFO where username='guojing'");
             StringBuffer sql = new StringBuffer();
             sql.append("select * from PO_USER_BASE_INFO where ");
             sql.append("username = ?");
             ps = conn.prepareStatement(sql.toString());
             ps.setString(1, "guojing");
             rs = ps.executeQuery();
             while (rs.next()) {
                 System.out.println(rs.getString("USERNAME"));
             }

             rs.close();
             //stmt.close();
             ps.close();
             conn.close();
         } catch (SQLException e) {
             e.printStackTrace();
         }

     }
 }