如何连接JDBC ？

2023年3月23日 129次阅读 
 1 import java.sql.Connection;  2 import java.sql.DriverManager;  3 import java.sql.ResultSet;  4 import java.sql.SQLException;  5 import java.sql.Statement;  6 //虽然是使用的JDBC 但这在里引用的都是sql下的。
 7 public class JDBC {  8     
 9     public static void main(String[] args) { 10         Statement stat = null ; 11         Connection conn=null; 12         ResultSet resultSet= null; 13         
14         //1.加载JDBC驱动
15         try { 16             Class.forName("com.mysql.jdbc.Driver"); 17         } catch (ClassNotFoundException e) { 18             // TODO Auto-generated catch block
19  e.printStackTrace(); 20  } 21         //2、建立数据库连接
22         
23         try { 24             conn=   DriverManager.getConnection("jdbc:mysql://localhost:3308/shxt","root","mysql"); 25         } catch (SQLException e) { 26             // TODO Auto-generated catch block
27  e.printStackTrace(); 28  } 29         
30     
31         //3、用数据库连接生成语句对象
32         try { 33              stat= conn.createStatement(); 34         } catch (SQLException e) { 35             // TODO Auto-generated catch block
36  e.printStackTrace(); 37  } 38         //4、用语句对象执行sql
39         String sqlInsert = "insert into student(sid,sname,age)values(32,'小龙龙',22)"; 40         String sqlSelect ="select sid,sname,age from student"; 41         int a=0; 42         
43         try { 44             resultSet= stat.executeQuery(sqlSelect); 45             
46         } catch (SQLException e1) { 47             // TODO Auto-generated catch block
48  e1.printStackTrace(); 49  } 50         /*try { 51  int a =stat.executeUpdate(sqlInsert); 52  if(a >0){ 53  System.out.println("修改成功！"); 54  }else { 55  System.out.println("修改失败！"); 56  } 57  } catch (SQLException e) { 58  // TODO Auto-generated catch block 59  e.printStackTrace(); 60  } 61          */
62         try { 63             while(resultSet.next()) 64  { 65                 String  sid =  resultSet.getString("sid"); 66                 String sname = resultSet.getString("sname"); 67                 String  age =  resultSet.getString("age"); 68                 System.out.println(sid+"\t"+sname+"\t"+age); 69  } 70         } catch (SQLException e1) { 71             // TODO Auto-generated catch block
72  e1.printStackTrace(); 73  } 74         //5、释放资源（数据库连接）
75         try { 76  conn.close(); 77         } catch (SQLException e) { 78             // TODO Auto-generated catch block
79  e.printStackTrace(); 80  } 81 
82 } 83 }

 

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