Java JDBC数据库链接详解编程语言

 1 import java.sql.Connection; 
 2 import java.sql.DriverManager; 
 3 import java.sql.Statement; 
 4 import java.sql.ResultSet; 
 5  
 6 public class MyTest { 
 7     public static void main(String args[]) { 
 8         Connection con = null; 
 9         Statement  st  = null; 
10         ResultSet  rs  = null; 
11         try { 
12             // 获得MySQL驱动的实例 
13             Class.forName("com.mysql.jdbc.Driver").newInstance(); 
14             // 获得连接对象(提供：地址，用户名，密码) 
15             con = DriverManager.getConnection("jdbc:mysql://127.0.0.1/Weather","root", "root"); 
16          
17             if (!con.isClosed()) 
18                 System.out.println("Successfully connected "); 
19             else 
20                 System.out.println("failed connected"); 
21              
22             //建立一个Statement，数据库对象 
23             st = con.createStatement(); 
24             // 运行SQL查询语句 
25             rs = st.executeQuery("select * from Weather.question_type_1;"); 
26             // 读取结果集 
27             while (rs.next()) { 
28                 System.out.println("column1:"+rs.getInt(1)); 
29                 System.out.println("column2:"+rs.getString(2)); 
30                 System.out.println("column3:"+rs.getString(3)); 
31                 System.out.println("column4:"+rs.getString(4)); 
32             } 
33             // 关闭链接 
34             con.close(); 
35         } catch(Exception e) { 
36             System.err.println("Exception: " + e.getMessage()); 
37         } 
38     } 
39 }