java简单的数据库查询（SQLServer数据库）

1.数据库链接类

 1 import java.sql.Connection;

 2 import java.sql.DriverManager;

 3 import java.sql.SQLException;

 4 

 5 public class DBHelper {

 6     /**

 7      * 获取数据库链接

 8      * 

 9      * @return 数据库链接

10      */

11     public static Connection getConnection() {

12         Connection conn = null;

13         String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";// 驱动

14         String username = "sa";// 用户名

15         String password = "sa";// 密码

16         String url = "jdbc:sqlserver://192.168.1.10;DatabaseName=test";// SqlServer链接地址

17         try {

18             Class.forName(driver);//加载驱动类

19             conn = DriverManager.getConnection(url, username, password);

20         } catch (ClassNotFoundException e) {

21             System.out.println("找不到驱动程序类 ，加载驱动失败！");

22             e.printStackTrace();

23         } catch (SQLException e) {

24             System.out.println("数据库连接失败！");

25             e.printStackTrace();

26         }

27         return conn;

28     }

29 

30 }

2.执行查询

 1 import java.sql.Connection;

 2 import java.sql.PreparedStatement;

 3 import java.sql.ResultSet;

 4 import java.sql.SQLException;

 5 

 6 public class TestQuery {

 7 

 8     public static void main(String[] args) {

 9         Connection conn = DBHelper.getConnection();// 获取数据库链接

10         PreparedStatement ps = null;

11         ResultSet rs = null;

12         try {

13             String sql = "select * from users";

14             ps = conn.prepareStatement(sql);

15             rs = ps.executeQuery();// 执行查询

16             while (rs.next()) {// 判断是否还有下一个数据

17                 System.out.println("ID:" + rs.getString("id") + "\tNAME:"

18                         + rs.getString("name"));

19             }

20         } catch (SQLException e) {

21             e.printStackTrace();

22         } finally {

23             if (rs != null) {

24                 try {

25                     rs.close();// 关闭记录集

26                 } catch (SQLException e) {

27                     e.printStackTrace();

28                 }

29             }

30             if (ps != null) {

31                 try {

32                     ps.close();// 关闭声明

33                 } catch (SQLException e) {

34                     e.printStackTrace();

35                 }

36             }

37             if (conn != null) {

38                 try {

39                     conn.close();// 关闭连接

40                 } catch (SQLException e) {

41                     e.printStackTrace();

42                 }

43             }

44         }

45 

46     }

47 

48 }

3.执行结果

ID:00027c20dad4467180be4637d1f6008f    NAME:张三

ID:0c99ddbeba304596ae87f34cfb1e21f7    NAME:李四