如何连接JDBC ？

2019-08-16 09:24:10来源：博客园阅读 ()

如何连接JDBC ？

 1 import java.sql.Connection;
 2 import java.sql.DriverManager;
 3 import java.sql.ResultSet;
 4 import java.sql.SQLException;
 5 import java.sql.Statement;
 6 //虽然是使用的JDBC 但这在里引用的都是sql下的。
 7 public class JDBC {
 8     
 9     public static void main(String[] args) {
10         Statement stat = null ;
11         Connection conn=null;
12         ResultSet resultSet= null;
13         
14         //1.加载JDBC驱动
15         try {
16             Class.forName("com.mysql.jdbc.Driver");
17         } catch (ClassNotFoundException e) {
18             // TODO Auto-generated catch block
19             e.printStackTrace();
20         }
21         //2、建立数据库连接
22         
23         try {
24             conn=   DriverManager.getConnection("jdbc:mysql://localhost:3308/shxt","root","mysql");
25         } catch (SQLException e) {
26             // TODO Auto-generated catch block
27             e.printStackTrace();
28         }
29         
30     
31         //3、用数据库连接生成语句对象
32         try {
33              stat= conn.createStatement();
34         } catch (SQLException e) {
35             // TODO Auto-generated catch block
36             e.printStackTrace();
37         }
38         //4、用语句对象执行sql
39         String sqlInsert = "insert into student(sid,sname,age)values(32,'小龙龙',22)";
40         String sqlSelect ="select sid,sname,age from student";
41         int a=0;
42         
43         try {
44             resultSet= stat.executeQuery(sqlSelect);
45             
46         } catch (SQLException e1) {
47             // TODO Auto-generated catch block
48             e1.printStackTrace();
49         }
50         /*try {
51             int a =stat.executeUpdate(sqlInsert);
52             if(a >0){
53                 System.out.println("修改成功！");
54             }else {
55                 System.out.println("修改失败！");
56             }
57         } catch (SQLException e) {
58             // TODO Auto-generated catch block
59             e.printStackTrace();
60         }
61          */
62         try {
63             while(resultSet.next())
64             {
65                 String  sid =  resultSet.getString("sid");
66                 String sname = resultSet.getString("sname");
67                 String  age =  resultSet.getString("age");
68                 System.out.println(sid+"\t"+sname+"\t"+age);
69             }
70         } catch (SQLException e1) {
71             // TODO Auto-generated catch block
72             e1.printStackTrace();
73         }
74         //5、释放资源（数据库连接）
75         try {
76             conn.close();
77         } catch (SQLException e) {
78             // TODO Auto-generated catch block
79             e.printStackTrace();
80         }
81 
82 }
83 }