规范和封装jdbc程序代码

JDBC 部分方法引用工具类

 1 package it.cast.jdbc;
 2
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.ResultSet;
 6 import java.sql.SQLException;
 7 import java.sql.Statement;
 8
 9 public class jdbcUtils {
10
11     private static String url = "jdbc:mysql://localhost:3306/jdbc";
12     private static String user = "root";
13     private static String password = "123";
14
15     private jdbcUtils() {
16
17     }
18
19     static {
20         try {
21             Class.forName("com.mysql.jdbc.Driver");
22         } catch (ClassNotFoundException e) {
23             e.printStackTrace();
24         }
25     }
26
27     public static Connection getConnection() throws SQLException {
28         return DriverManager.getConnection(url, user, password);
29     }
30
31     public static void free(ResultSet rs, Statement st, Connection conn) {
32
33         try {
34             if (rs != null)
35                 rs.close();
36         } catch (SQLException e) {
37             e.printStackTrace();
38         } finally {
39
40             try {
41                 if (st != null)
42                     st.close();
43             } catch (SQLException e) {
44                 e.printStackTrace();
45             } finally {
46
47                 try {
48                     if (conn != null)
49                         conn.close();
50                 } catch (SQLException e) {
51                     e.printStackTrace();
52                 }
53             }
54
55         }
56
57     }
58 }

jdbcUtils

 1 package it.cast.jdbc;
 2
 3 import java.sql.Connection;
 4 import java.sql.ResultSet;
 5 import java.sql.SQLException;
 6 import java.sql.Statement;
 7
 8 public class Base {
 9
10     static Connection conn = null;
11
12     public static void main(String[] args) throws SQLException, ClassNotFoundException {
13          test();
14     }
15
16     static void test() throws SQLException, ClassNotFoundException {
17
18
19         // 2.建立连接
20         conn = jdbcUtils.getConnection();
21
22         // 3.创建语句
23         Statement st = conn.createStatement();
24
25         // 4.执行语句
26         ResultSet rs = st.executeQuery("select * from user");
27
28         // 5.处理结果
29         while (rs.next()) {
30             System.out.println(rs.getObject(1) + "\t" + rs.getObject(2) + "\t"
31                     + rs.getObject(3)+"\t" + rs.getObject(4));
32         }
33
34         //6.释放资源
35         jdbcUtils.free(rs, st, conn);
36     }
37
38 }

Base

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