java简单的数据库查询（SQLServer数据库）

1.数据库链接类

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

 public class DBHelper {
     /**
      * 获取数据库链接
      *
      * @return 数据库链接
      */
     public static Connection getConnection() {
         Connection conn = null;
         String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";// 驱动
         String username = "sa";// 用户名
         String password = "sa";// 密码
         String url = "jdbc:sqlserver://192.168.1.10;DatabaseName=test";// SqlServer链接地址
         try {
             Class.forName(driver);//加载驱动类
             conn = DriverManager.getConnection(url, username, password);
         } catch (ClassNotFoundException e) {
             System.out.println("找不到驱动程序类 ，加载驱动失败！");
             e.printStackTrace();
         } catch (SQLException e) {
             System.out.println("数据库连接失败！");
             e.printStackTrace();
         }
         return conn;
     }

 }

2.执行查询

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

 public class TestQuery {

     public static void main(String[] args) {
         Connection conn = DBHelper.getConnection();// 获取数据库链接
         PreparedStatement ps = null;
         ResultSet rs = null;
         try {
             String sql = "select * from users";
             ps = conn.prepareStatement(sql);
             rs = ps.executeQuery();// 执行查询
             while (rs.next()) {// 判断是否还有下一个数据
                 System.out.println("ID:" + rs.getString("id") + "\tNAME:"
                         + rs.getString("name"));
             }
         } catch (SQLException e) {
             e.printStackTrace();
         } finally {
             if (rs != null) {
                 try {
                     rs.close();// 关闭记录集
                 } catch (SQLException e) {
                     e.printStackTrace();
                 }
             }
             if (ps != null) {
                 try {
                     ps.close();// 关闭声明
                 } catch (SQLException e) {
                     e.printStackTrace();
                 }
             }
             if (conn != null) {
                 try {
                     conn.close();// 关闭连接
                 } catch (SQLException e) {
                     e.printStackTrace();
                 }
             }
         }

     }

 }

3.执行结果

ID:00027c20dad4467180be4637d1f6008f    NAME:张三
ID:0c99ddbeba304596ae87f34cfb1e21f7    NAME:李四