try{
//加載MySql的驅(qū)動(dòng)類
Class.forName("com.mysql.jdbc.Driver") ;
}catch(ClassNotFoundException e){
System.out.println("找不到驅(qū)動(dòng)程序類 ，加載驅(qū)動(dòng)失??！");
e.printStackTrace() ;
}

//連接MySql數(shù)據(jù)庫(kù)，用戶名和密碼都是root
String url = "jdbc:mysql://localhost:3306/test" ;
String username = "root" ;
String password = "root" ;
try{
Connection con = DriverManager.getConnection(url , username , password ) ;
}catch(SQLException se){
System.out.println("數(shù)據(jù)庫(kù)連接失??！");
se.printStackTrace() ;
}

Statement stmt = con.createStatement() ;
PreparedStatement pstmt = con.prepareStatement(sql) ;
CallableStatement cstmt = con.prepareCall("{CALL demoSp(? , ?)}") ;

ResultSet rs = stmt.executeQuery("SELECT * FROM ...") ;
int rows = stmt.executeUpdate("INSERT INTO ...") ;
boolean flag = stmt.execute(String sql) ;

while(rs.next()){
 String name = rs.getString("name") ;
String pass = rs.getString(1) ; // 此方法比較高效
}

if(rs != null){ // 關(guān)閉記錄集
try{
  rs.close() ;
}catch(SQLException e){
  e.printStackTrace() ;
}
}
if(stmt != null){ // 關(guān)閉聲明
try{
  stmt.close() ;
}catch(SQLException e){
  e.printStackTrace() ;
}
}
if(conn != null){ // 關(guān)閉連接對(duì)象
 try{
  conn.close() ;
 }catch(SQLException e){
  e.printStackTrace() ;
 }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestOracle {
 public static void main(String[] args) {
 Connection conn = null;
  Statement stmt = null;
  ResultSet rs = null;
  try {
   Class.forName("oracle.jdbc.driver.OracleDriver");//實(shí)例化oracle數(shù)據(jù)庫(kù)驅(qū)動(dòng)程序(建立中間件)
   String url = "jdbc:oracle:thin:@localhost:1521:oar92";//@localhost為服務(wù)器名，sjzwish為數(shù)據(jù)庫(kù)實(shí)例名
   conn = DriverManager.getConnection(url, "guchao", "jimmy");//連接數(shù)據(jù)庫(kù)，a代表帳戶,a代表密碼
   stmt = conn.createStatement();//提交sql語(yǔ)句,創(chuàng)建一個(gè)Statement對(duì)象來(lái)將SQL語(yǔ)句發(fā)送到數(shù)據(jù)庫(kù)
   //查詢數(shù)據(jù)用executeQuery
   rs = stmt.executeQuery("select * from ruby");//執(zhí)行查詢,(ruby)為表名
   while (rs.next()) {//使當(dāng)前記錄指針定位到記錄集的第一條記錄
   System.out.println(rs.getString("sid") +" "+ rs.getString("sname"));
   }//1代表當(dāng)前記錄的第一個(gè)字段的值，可以寫(xiě)成字段名。
   //2代表當(dāng)前記錄的第二個(gè)字段的值，可以寫(xiě)成字段名。
   //添加數(shù)據(jù)用executeUpdate
   //stmt.executeUpdate("insert into ss values(7,'張學(xué)友')");
   //修改數(shù)據(jù)用executeUpdate
   //stmt.executeUpdate("update ss set name = '張曼玉' where id = 5");
   //刪除 數(shù)據(jù)用executeUpdate
   //stmt.executeUpdate("delete from ss where id = 6");
  } catch (SQLException e) {
   e.printStackTrace();
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  }finally{
   try {
   //關(guān)閉數(shù)據(jù)庫(kù)，結(jié)束進(jìn)程
   rs.close();
   stmt.close();
   conn.close();
   } catch (SQLException e) {
   e.printStackTrace();
   }
  }
 }
}