相对完善的Java通过JDBC操纵mysql的例子

工具类:

 

 1import java.sql.Connection;
 2import java.sql.DriverManager;
 3import java.sql.ResultSet;
 4import java.sql.SQLException;
 5import java.sql.Statement;
 6
 7
 8public final class JDBCUtils {
 9
10    private JDBCUtils(){}
11    
12    private static String url="jdbc:mysql://localhost:3306/forum";
13    private static String user="root";
14    private static String password="root";
15    
16    static{
17        try {
18            Class.forName("com.mysql.jdbc.Driver");
19        } catch (ClassNotFoundException e) {
20            throw new ExceptionInInitializerError(e);
21        }
22    }
23    
24    public static Connection getConnection() throws SQLException
25    {
26        return DriverManager.getConnection(url, user, password);        
27    }
28    
29    public static void free(ResultSet rs,Statement st,Connection conn)
30    {
31        try{
32            
33            if(rs!=null)
34                rs.close();
35        }catch(SQLException e){
36            e.printStackTrace();
37        }finally{
38            
39                        try{
40                            if(st!=null)
41                                st.close();
42                        }catch(SQLException e){
43                            e.printStackTrace();
44                        }finally{
45                            
46                                        try{
47                                            if(conn!=null)
48                                                conn.close();
49                                        }catch(SQLException e){
50                                            e.printStackTrace();
51                                        }        
52                        }
53        }
54    }
55}
56

使用的例子:

 

 1public static void main(String[] args) {
 2        // TODO Auto-generated method stub
 3        try {
 4            JDBCUtilsTest();
 5        } catch (Exception e) {
 6            // TODO Auto-generated catch block
 7            e.printStackTrace();
 8        }
 9
10    }
11    
12    
13    public static void JDBCUtilsTest() throws Exception
14    {
15        Connection conn=null;
16        Statement st=null;
17        ResultSet rs=null;
18        
19        try{
20            conn=JDBCUtils.getConnection();
21            st=conn.createStatement();
22            rs=st.executeQuery("select * from user");
23            while(rs.next())
24            {
25                System.out.println(rs.getObject(1)+"\t"+rs.getObject(2));
26            }
27        }finally{
28            JDBCUtils.free(rs, st, conn);
29        }    
30        
31    }