JDBC的实例

实例1.  使用纯Java的方式连接数据库

 3   import java.sql.Connection;
 4   import java.sql.DriverManager;
 5   import java.sql.SQLException;
 6   
 7   
 8   public class Test1 {
 9   
10       public static void main(String[] args){
11          //1:加载数据库驱动
12           try {
13              Class.forName("com.mysql.jdbc.Driver");
14          } catch (ClassNotFoundException e) {
15              e.printStackTrace();
16         }
17          
18          
19        
20         //2:建立连接，获得Connection对象
21 
22         //Eclipse：导入包的快捷键：Ctrl+Shift+O
23          //代码的格式化：Ctro+Shift+F
24           
25           Connection conn=null;
26          try {
27             conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/day01","root","root");
28              System.out.println("連接成功");
29          } catch (SQLException e) {
30              e.printStackTrace();
31          }
32              //3.获取Statement对象
33         try {
34             stmt=conn.createStatement();
35             //stmt.execute(sql);
36             stmt.executeUpdate(sql);
37             
38         } catch (Exception e) {
39         }
40          
41         //4:关闭资源
42           try {
43            conn.close();
44        } catch (SQLException e) {
45              e.printStackTrace();
46         }
47      }
48     }

需求：使用ResultSet查询dog信息

 1 import java.sql.Connection;
 2 import java.sql.DriverManager;
 3 import java.sql.ResultSet;
 4 import java.sql.Statement;
 5 
 6 /**
 7  * 需求：使用ResultSet查询dog信息
 8  * 
 9  * @author10  *
11  */
12 
13 public class Test3 {
14     public static void main(String[] args) {
15         Connection conn = null;
16         Statement stmt = null;
17         ResultSet rs = null;
18 
19         String url = "jdbc:mysql://localhost:3306/day01";
20         String user = "root";
21         String password = "root";
22         String sql = "SELECT * FROM dog";
23 
24         try {
25             Class.forName("com.mysql.jdbc.Driver");
26             conn = DriverManager.getConnection(url, user, password);
27             stmt = conn.createStatement();
28             rs = stmt.executeQuery(sql);
29 
30             // 遍历rs
31             // rs.next();指针下移    
32             while (rs.next()) {
33                 // 在MySql数据库中index从1开始
34                 System.out.println(rs.getObject(1) + "\t");
35                 System.out.println(rs.getObject(2) + "\t");
36                 System.out.println(rs.getObject("health") + "\t");
37                 System.out.println(rs.getObject("love") + "\t");
38                 System.out.println(rs.getObject("strain") + "\t");
39 
40             }
41 
42         } catch (Exception e) {
43 
44         } finally {
45             try {
46                 if (null != rs) {
47                     rs.close();
48                 }
49                 if (null != stmt) {
50                     stmt.close();
51                 }
52                 if (null != conn) {
53                     conn.close();
54                 }
55             } catch (Exception e2) {
56             }
57 
58         }
59 
60     }
61 }

 

posted @ 2016-12-14 20:19  彬之华666  阅读(289)  评论(0)  编辑  收藏  举报