1 package demo;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.ResultSet;
 6 import java.sql.SQLException;
 7 import java.sql.Statement;
 8 
 9 public class JDBCUtils {
10     private static String driver = "oracle.jdbc.OracleDriver";
11     private static String url = "jdbc:oracle:thin:@192.168.56.101:1521:orcl";
12     private static String user = "scott";
13     private static String password = "tiger";
14     
15     static{
16         try {
17             Class.forName(driver);
18         } catch (ClassNotFoundException e) {
19             throw new ExceptionInInitializerError(e);
20         }
21         //DriverManager.registerDriver(driver)
22     }
23 
24     public static Connection getConnection(){
25         try {
26             return DriverManager.getConnection(url, user, password);
27         } catch (SQLException e) {
28             e.printStackTrace();
29         }
30         return null;
31     }
32 
33     /*
34      * 运行Java程序
35      * java -Xms100M -Xmx200M HelloWorld
36      * 
37      * 技术方向:
38      * 1. 性能调优  ---> tomcat
39      * 2. 故障诊断  ---> 死锁
40      */
41     public static void release(Connection conn,Statement st,ResultSet rs){
42         if(rs != null){
43             try {
44                 rs.close();
45             } catch (SQLException e) {
46                 e.printStackTrace();
47             }finally{
48                 rs = null;// ----> java GC
49             }
50         }
51         if(st != null){
52             try {
53                 st.close();
54             } catch (SQLException e) {
55                 e.printStackTrace();
56             }finally{
57                 st = null;
58             }
59         }
60         if(conn != null){
61             try {
62                 conn.close();
63             } catch (SQLException e) {
64                 e.printStackTrace();
65             }finally{
66                 conn = null;
67             }
68         }
69     }
70 }

  1 package demo;
  2 
  3 import java.sql.CallableStatement;
  4 import java.sql.Connection;
  5 import java.sql.ResultSet;
  6 
  7 import oracle.jdbc.OracleCallableStatement;
  8 import oracle.jdbc.OracleTypes;
  9 
 10 import org.junit.Test;
 11 
 12 public class TestOracle {
 13 /*
 14  * create or replace procedure queryempinfo(eno in number,
 15                                             pename out varchar2,
 16                                             psal   out number,
 17                                             pjob   out varchar2)
 18  */
 19     @Test
 20     public void testProcedure(){
 21         //{call <procedure-name>[(<arg1>,<arg2>, ...)]}
 22         String sql = "{call queryempinfo(?,?,?,?)}";
 23             
 24         Connection conn = null;
 25         CallableStatement call = null;
 26         try {
 27             conn = JDBCUtils.getConnection();
 28             call = conn.prepareCall(sql);
 29             
 30             //对于in参数，赋值
 31             call.setInt(1, 7839);
 32             
 33             //对于out参数，申明
 34             call.registerOutParameter(2, OracleTypes.VARCHAR);
 35             call.registerOutParameter(3, OracleTypes.NUMBER);
 36             call.registerOutParameter(4, OracleTypes.VARCHAR);
 37             
 38             //执行
 39             call.execute();
 40             
 41             //取出结果
 42             String name = call.getString(2);
 43             double sal = call.getDouble(3);
 44             String job = call.getString(4);
 45             System.out.println(name+"\t"+sal+"\t"+job);
 46         } catch (Exception e) {
 47             e.printStackTrace();
 48         }finally{
 49             JDBCUtils.release(conn, call, null);
 50         }
 51     }
 52 
 53 /*
 54  * create or replace function queryempincome(eno in number)
 55 return number
 56  */
 57     @Test
 58     public void testFunction(){
 59         //{?= call <procedure-name>[(<arg1>,<arg2>, ...)]}
 60         String sql = "{?=call queryempincome(?)}";
 61         
 62         Connection conn = null;
 63         CallableStatement call = null;
 64         try {
 65             conn = JDBCUtils.getConnection();
 66             call = conn.prepareCall(sql);
 67             
 68             //第一个是out参数
 69             call.registerOutParameter(1, OracleTypes.NUMBER);
 70             //第二个是in参数
 71             call.setInt(2, 7839);
 72             
 73             call.execute();
 74             
 75             //取出年收入
 76             double income = call.getDouble(1);
 77             System.out.println(income);
 78         } catch (Exception e) {
 79             e.printStackTrace();
 80         }finally{
 81             JDBCUtils.release(conn, call, null);
 82         }        
 83     }
 84 
 85 
 86     @Test
 87     public void testCursor(){
 88         String sql = "{call MYPAKCAGE.queryEmpList(?,?)}";
 89         
 90         Connection conn = null;
 91         CallableStatement call = null;
 92         ResultSet rs = null;
 93         try {
 94             conn = JDBCUtils.getConnection();
 95             call = conn.prepareCall(sql);
 96             
 97             //对于in参数，赋值
 98             call.setInt(1, 20);
 99             //对于out参数  申明
100             call.registerOutParameter(2, OracleTypes.CURSOR);
101             
102             call.execute();
103             
104             //取出结果
105             rs = ((OracleCallableStatement)call).getCursor(2);
106             while(rs.next()){
107                 //取出一个员工
108                 String name = rs.getString("ename");
109                 double sal = rs.getDouble("sal");
110                 System.out.println(name+"\t"+sal);
111             }
112         } catch (Exception e) {
113             e.printStackTrace();
114         }finally{
115             JDBCUtils.release(conn, call, rs);
116         }
117     }
118 }