package sqldemo;
2
3 import java.sql.Connection;
4 import java.sql.DriverManager;
5 import java.sql.ResultSet;
6 import java.sql.SQLException;
7 import java.sql.Statement;
8
9 public class main {
10
11 public static void main(String[] args) {
12 //声明Connection对象
13 Connection con;
14 //驱动程序名
15 String driver = "com.mysql.jdbc.Driver"
;
16 //URL指向要访问的数据库名mydata
17 String url = "jdbc:mysql://localhost:3306/sqltestdb"
;
18 //MySQL配置时的用户名
19 String user = "root"
;
20 //MySQL配置时的密码
21 String password = "123456"
;
22 //遍历查询结果集
23 try {
24 //加载驱动程序
25 Class.forName(driver);
26 //1.getConnection()方法，连接MySQL数据库！！
27 con =
DriverManager.getConnection(url,user,password);
28 if(!
con.isClosed())
29 System.out.println("Succeeded connecting to the Database!"
);
30 //2.创建statement类对象，用来执行SQL语句！！
31 Statement statement =
con.createStatement();
32 //要执行的SQL语句
33 String sql = "select * from emp"
;
34 //3.ResultSet类，用来存放获取的结果集！！
35 ResultSet rs = statement.executeQuery(sql);
36 System.out.println("-----------------"
);
37 System.out.println("执行结果如下所示:"
);
38 System.out.println("-----------------"
);
39 System.out.println("姓名" + "\t" + "职称"
);
40 System.out.println("-----------------"
);
41
42 String job =
null;
43 String id =
null;
44 while(rs.next()){
45 //获取stuname这列数据
46 job = rs.getString("job"
);
47 //获取stuid这列数据
48 id = rs.getString("ename"
);
49
50 //输出结果
51 System.out.println(id + "\t" +
job);
52 }
53 rs.close();
54 con.close();//关闭连接
55 }
catch(ClassNotFoundException e) {
56 //数据库驱动类异常处理
57 System.out.println("Sorry,can`t find the Driver!"
);
58 e.printStackTrace();
59 }
catch(SQLException e) {
60 //数据库连接失败异常处理
61 e.printStackTrace();
62 }
catch (Exception e) {
63 // TODO: handle exception
64 e.printStackTrace();
65 }
finally{
66 System.out.println("数据库数据成功获取！！"
);
67 }
68 }
69
70 }
String name;
String id;
PreparedStatement psql;
ResultSet res;
//预处理添加数据，其中有两个参数--“？”
psql = con.prepareStatement("insert into emp (empno,ename,job,hiredate,sal) "
+ "values(?,?,?,?,?)");
psql.setInt(1, 3212); //设置参数1，创建id为3212的数据
psql.setString(2, "王刚"); //设置参数2，name 为王刚
psql.setString(3, "总裁");
DateFormat dateFormat2 = new SimpleDateFormat("yyyy-MM-dd");
Date myDate2 = dateFormat2.parse("2010-09-13");
psql.setDate(4,new java.sql.Date(myDate2.getTime()));
psql.setFloat(5, (float) 2000.3);
psql.executeUpdate(); //执行更新
psql.close;
PreparedStatement psql;
//预处理更新（修改）数据，将王刚的sal改为5000.0
psql = con.prepareStatement("update emp set sal = ? where ename = ?");
psql.setFloat(1,(float) 5000.0);
psql.setString(2,"王刚");
psql.executeUpdate();
psql.close();
PreparedStatement psql;
//预处理删除数据
psql = con.prepareStatement("delete from emp where sal > ?");
psql.setFloat(1, 4500);
psql.executeUpdate();
psql.close();
java操作数据库
标签：数据库连接 val lex cti bsp dex 设置 static mysql配置
