Java JDBC数据库链接

 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 }