JDBCUtil连接数据库的写法

Posted 2022-06-24 wangquanyi

JDBCUtil连接mysql数据库的写法：

代码：

 1 import com.harzone.dongguan.service.JDBCutil;
 2 import org.springframework.beans.factory.annotation.Value;
 3 import org.springframework.stereotype.Component;
 4 
 5 import java.sql.*;
 6 
 7 @Component
 8 public class JDBCUtilImpl implements JDBCutil 
 9     @Value("$jdbc.username")
10     private  String username;
11     @Value("$jdbc.password")
12     private  String password;
13     @Value("$jdbc.path")
14     private  String Path;
15     @Value("$jdbc.port")
16     private String port;
17     @Value("$jdbc.DatabaseName")
18     private String DatabaseName;
19 
20     @Override
21     public Connection getConnection() 
22         try 
23             try 
24                 Class.forName("com.mysql.cj.jdbc.Driver");
25              catch (ClassNotFoundException e) 
26                 e.printStackTrace();
27             
28             String url = "jdbc:mysql://" + Path + ":" + port + "/" + DatabaseName + "?characterEncoding=utf8&useSSL=true&serverTimezone=GMT";
29             Connection connection = DriverManager.getConnection(url, username,password);
30             return connection;
31          catch (SQLException e) 
32             System.out.println("数据库连接失败。。。。。");
33             e.printStackTrace();
34         
35         return null;
36     
37 
38     @Override
39     public void colseAll(ResultSet rs, Statement statement, Connection conn) 
40         if (rs != null) 
41             try 
42                 rs.close();
43              catch (SQLException e) 
44                 e.printStackTrace();
45             
46         
47         if (statement != null) 
48             try 
49                 statement.close();
50              catch (SQLException e) 
51                 e.printStackTrace();
52             
53         
54         if (conn != null) 
55             try 
56                 conn.close();
57              catch (SQLException e) 
58                 e.printStackTrace();
59             
60         
61     
62 

配置相关写法：

#数据库连接
jdbc:
  username: root
  password: root
  path: localhost
  port: 3306
  DatabaseName: demo01

调用相关的写法：

 1  　　　　　　PreparedStatement preparedStatement = null;
 2             Connection connection = jdbcUtil.getConnection();
 3             //查询字典表获取性别code
 4             String sql = "SELECT * FROM dictionary d WHERE d.type=‘XBDM‘";
 5             try 
 6                 preparedStatement = connection.prepareStatement(sql);
 7                 ResultSet rs = preparedStatement.executeQuery();
 8                 while (rs.next()) 
 9                     String code_name = rs.getString("code_name");
10                     //判断得到的性别和字典表的性别，匹配返回对应的code值
11                     if (genderCode.equals(code_name)) 
12                         String code = rs.getString("code");
13                         //将code封装到请求体，实现转换字段
14                         bodyMap.put("genderCode", code);
15                     
16                 
17              catch (SQLException e) 
18                 e.printStackTrace();
19