JAVA-JDBC-c3p0连接池配置

1 <?xml version="1.0" encoding="UTF-8"?>
2 <c3p0-config>
3     <default-config>
4         <property name ="driverClass">com.mysql.jdbc.Driver</property>
5         <property name ="jdbcUrl">jdbc:mysql://localhost:****/********</property>
6         <property name ="user">*********</property>
7         <property name ="password">***********</property>
8     </default-config>
9 </c3p0-config>

 1 package JDBC;
 2 
 3 
 4 import java.sql.Connection;
 5 import java.sql.ResultSet;
 6 import java.sql.SQLException;
 7 import java.sql.Statement;
 8 
 9 import com.mchange.v2.c3p0.ComboPooledDataSource;
10 
11 /**
12  * c3p0连接池
13  * @author Administrator
14  *
15  */
16 public class C3P0 {
17     public static void main(String[] args) {
18         Connection conn = null;
19         Statement stat = null;
20         ResultSet rs = null;
21         //创建一个c3p0数据源对象
22         ComboPooledDataSource scoure = new ComboPooledDataSource();
23         //利用对象读取配置信息
24         //注释掉这段代码后会去找配置文件，存在任意一个都可以成功
25         /*try {
26             scoure.setDriverClass("com.mysql.jdbc.Driver");
27             scoure.setJdbcUrl("jdbc:mysql://localhost:****/******");
28             scoure.setUser("********");
29             scoure.setPassword("*****");
30         } catch (Exception e) {
31             // TODO: handle exception
32         }*/
33     
34         try {
35             conn = scoure.getConnection();
36             stat = conn.createStatement();
37             rs = stat.executeQuery("select * from student");
38             while(rs.next()){
39                 int sno =rs.getInt("sno");
40                 String sname = rs.getString("sname");
41                 System.out.println("id:"+sno);
42                 System.out.println("sname:"+sname);
43             }
44         } catch (SQLException e) {
45             // TODO Auto-generated catch block
46             e.printStackTrace();
47         }finally{
48             if(rs != null){
49                 try {
50                     rs.close();
51                 } catch (Exception e2) {
52                     e2.printStackTrace();
53                 }finally{
54                     rs = null;
55                 }
56             }
57             if(stat != null){
58                 try {
59                     stat.close();
60                 } catch (Exception e2) {
61                     e2.printStackTrace();
62                 }finally{
63                     stat = null;
64                 }
65             }
66             if(conn != null){
67                 try {
68                     conn.close();
69                 } catch (Exception e2) {
70                     e2.printStackTrace();
71                 }finally{
72                     conn = null;
73                 }
74             }
75         }
76         
77     }
78 }