Java学习-JDBC练习

练习1

借助循环，向数据库中插入100条数据，并在mysql-front中观察查询结果

 1 package jdbc;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.SQLException;
 6 import java.sql.Statement;
 7 
 8 public class TestJDBC {
 9     public static void main(String[] args) {
10         // 初始化驱动
11         try {
12             Class.forName("com.mysql.jdbc.Driver");
13         } catch (ClassNotFoundException e) {
14             // TODO Auto-generated catch block
15             e.printStackTrace();
16         }
17         // 使用try-with-resource的方式自动关闭连接，因为Connection和Statement都实现了AutoCloseable接口
18         try (
19                 Connection c = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/how2java?characterEncoding=UTF-8",
20                 "root", "admin"); 
21                 Statement s = c.createStatement();) {
22             s.execute("truncate table hero");
23             String name = null;
24             float hp = 100.0f;
25             int damage = 100;
26             for (int i = 0; i < 100; i++) {
27                 name = "\'" + "Hero-" + String.valueOf(i + 1) + "\'";    //注意格式，必须单引号'
28                 String sql = "insert into hero values(null," + name + "," + (hp++) + "," + (damage++) + ")";
29                 s.execute(sql);
30             }
31         } catch (SQLException e) {
32             // TODO Auto-generated catch block
33             e.printStackTrace();
34         }
35 
36     }
37 }

效果图：