完成对数据库的CRUD操作

PS:查询相对复杂，要处理结果集，增删改则不用。

 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 CRUD {
 9
10     /**
11      * @param args
12      * @throws ClassNotFoundException
13      * @throws SQLException
14      */
15     public static void main(String[] args) throws SQLException, ClassNotFoundException {
16         delete();
17
18     }
19
20     //删除
21     static void delete() throws SQLException, ClassNotFoundException {
22
23         Connection conn = null;
24         Statement st = null;
25         ResultSet rs = null;
26         // 2.建立连接
27         conn = jdbcUtils.getConnection();
28
29         // 3.创建语句
30         st = conn.createStatement();
31
32         String sql = "delete from user where name=‘name1‘";
33
34         // 4.执行语句
35         int i = st.executeUpdate(sql);
36
37         System.out.println("I="+i);
38
39         // 6.释放资源
40         jdbcUtils.free(rs, st, conn);
41     }
42
43     //修改
44     static void update() throws SQLException, ClassNotFoundException {
45
46         Connection conn = null;
47         Statement st = null;
48         ResultSet rs = null;
49         // 2.建立连接
50         conn = jdbcUtils.getConnection();
51
52         // 3.创建语句
53         st = conn.createStatement();
54
55         String sql = "update user set money=money+10";
56
57         // 4.执行语句
58         int i = st.executeUpdate(sql);
59
60         System.out.println("I="+i);
61
62         // 6.释放资源
63         jdbcUtils.free(rs, st, conn);
64     }
65
66
67     //新增
68     static void create() throws SQLException, ClassNotFoundException {
69
70         Connection conn = null;
71         Statement st = null;
72         ResultSet rs = null;
73         // 2.建立连接
74         conn = jdbcUtils.getConnection();
75
76         // 3.创建语句
77         st = conn.createStatement();
78
79         String sql = "insert into user(name,birthday,money) values(‘name1‘,‘1997-01-01‘,4000)";
80
81         // 4.执行语句
82         int i = st.executeUpdate(sql);
83
84         System.out.println("I="+i);
85
86         // 6.释放资源
87         jdbcUtils.free(rs, st, conn);
88     }
89
90 }

CRUD

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