jdbc 查询操作

 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 
 7 public class Marin {
 8 
 9     public static void main(String[] args) {
10         ResultSet rs = null;
11         Statement stmt = null;
12         Connection connection =null;
13         try {
14             Class.forName("com.mysql.jdbc.Driver");
15             String url = "jdbc:mysql://127.0.0.1:3306/school2?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC";
16             
17             connection= DriverManager.getConnection(url, "root","123456" );
18 
19             String sql ="select subjectName, emial FROM subject2";
20 
21             stmt =connection.createStatement();
22             rs=stmt.executeQuery(sql);
23 
24             while(rs.next()) {
25                 String a=rs.getString(1);
26                 int b = rs.getInt(2);
27                 System.out.println(a+"\t"+b);
28             }
29         } catch (ClassNotFoundException e) {
30 
31         }catch (SQLException e) {
32 
33         }finally {
34             try {
35                 rs.close();
36                 stmt.close();
37                 connection.close();
38             } catch (SQLException e) {
39 
40                 e.printStackTrace();
41             }
42         }
43     }
44 }

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Marin2 {
    public void getTitle(String subjectName,int emial) {
        Connection con =null;
        PreparedStatement ps =null;
        ResultSet rs = null;
        
        try {
            Class.forName("com.mysql.jdbc.Driver");
            
            String url = "jdbc:mysql://127.0.0.1:3306/school2?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8";
            con =DriverManager.getConnection(url, "root", "123456");
            
            String sql ="select subjectName, emial FROM subject2 where subjectName=? or emial=?";
            
            ps = con.prepareStatement(sql);
            ps.setString(1, subjectName);
            ps.setInt(2, emial);
            
            rs = ps.executeQuery();
            
            while(rs.next()) {
                String a=rs.getString("subjectName");
                int b = rs.getInt("emial");
                System.out.println(a+"\t"+b);
                
            }
            
            
        } catch (ClassNotFoundException e) {
            
            e.printStackTrace();
        }catch (SQLException e) {
        
            e.printStackTrace();
        }finally {
            try {
                rs.close();
                ps.close();
                con.close();
            } catch (SQLException e) {

                e.printStackTrace();
            }
            
        }
        
        
    }
        public static void main(String[] args) {
        Marin2 m =new Marin2();
        m.getTitle("老王",242424 );

        
    }
    
    

}

jdbc 查询 操作

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jdbc 查询操作