Java JDBC连接mysql数据库

Posted 2020-10-12

 1 import java.sql.Connection;
 2 import java.sql.DriverManager;
 3 import java.sql.ResultSet;
 4 import java.sql.SQLException;
 5 import com.mysql.jdbc.PreparedStatement;
 6 
 7 public class DBTool {
 8 
 9     public static final  String DRIVER ="com.mysql.jdbc.Driver" ;    
10     public static final  String URL = "jdbc:mysql://localhost:3306/数据库名";    
11     public static final  String USERNAME = "用户名" ;    
12     public static final  String PSW = "密码" ;    
13     
14     public static Connection getConn(){
15         Connection conn = null;
16         try {
17             Class.forName(DRIVER);
18             conn = DriverManager.getConnection(URL,USERNAME,PSW);
19         } catch (ClassNotFoundException e) {
20             e.printStackTrace();
21         } catch (SQLException e) {
22             e.printStackTrace();
23         }
24         return conn;
25     }
26     //关闭资源
27     public static void closeAll(ResultSet rs, PreparedStatement ps,Connection conn){
28         if(rs!=null){
29             try {
30                 rs.close();
31             } catch (SQLException e) {
32                 e.printStackTrace();
33             }
34         }
35         if(ps!=null){
36             try {
37                 rs.close();
38             } catch (SQLException e) {
39                 e.printStackTrace();
40             }
41         }
42         if(conn!=null){
43             try {
44                 conn.close();
45             } catch (SQLException e) {
46                 e.printStackTrace();
47             }
48         }
49     }
50 
51 }