JDBC

Posted 2020-08-23 云中之歌

 

 

 

 1 package db;
 2 
 3 import java.io.FileInputStream;
 4 import java.io.FileNotFoundException;
 5 import java.io.IOException;
 6 import java.sql.Connection;
 7 import java.sql.DriverManager;
 8 import java.sql.SQLException;
 9 import java.util.Properties;
10 
11 import javax.sql.rowset.JdbcRowSet;
12 import javax.sql.rowset.RowSetFactory;
13 import javax.sql.rowset.RowSetProvider;
14 
15 
16 public class RowSetFactoryTest {
17     private String driver;
18     private String url;
19     private String user;
20     private String pass;
21     public void initParam(String paramFile) throws FileNotFoundException, IOException, ClassNotFoundException {
22         //用Properties类加载属性文件
23         Properties prop = new Properties();
24         prop.load(new FileInputStream(paramFile));
25         driver = prop.getProperty("driver");
26         url = prop.getProperty("url");
27         user = prop.getProperty("user");
28         pass = prop.getProperty("pass");
29         Class.forName(driver);
30     }
31     
32     public void update(String sql) throws SQLException {
33         RowSetFactory factory = RowSetProvider.newFactory();
34         
35         try (
36                 //使用RowSet的execute方式返回数据，则不再需DriverManager连接数据库了
37                 //Connection conn = DriverManager.getConnection(url, user, pass);
38                 /*
39                  * for JDK1.6
40                  * JdbcRowSet jdbcRs = new JdbcRowSetImpl(conn);
41                  */
42                 // for JDK 1.7
43                 JdbcRowSet jdbcRs = factory.createJdbcRowSet();
44                  ) {
45             jdbcRs.setUrl(url);
46             jdbcRs.setUsername(user);
47             jdbcRs.setPassword(pass);
48             jdbcRs.setCommand(sql);
49             jdbcRs.execute();
50             
51             jdbcRs.afterLast();
52             //向前滚动结果集
53             while(jdbcRs.previous()) {
54                 System.out.println(jdbcRs.getInt(1)+"\t"+jdbcRs.getString(2)+"\t"+jdbcRs.getString(3));
55                 
56                 if (jdbcRs.getInt("jdbc_id") == 3) {
57                     //修改指定行记录,因为 JdbcRowSet 继承自 ResultSet, 所以修改记录的方式也一样
58                     jdbcRs.updateString("jdbc_name", "小明");
59                     jdbcRs.updateRow();
60                     System.out.println("修改成功: ");
61                     System.out.println(+jdbcRs.getInt(1)+"\t"+jdbcRs.getString(2)+"\t"+jdbcRs.getString(3));
62                 }
63                 
64             }
65         }
66     }
67     
68     public static void main(String[] args) throws FileNotFoundException, ClassNotFoundException, IOException, SQLException {
69         RowSetFactoryTest jt = new RowSetFactoryTest();
70         jt.initParam("mysql.ini");
71         jt.update("select * from jdbc_test");
72     }
73 }