java连接sql server数据库

1、新建项目，导入包  sqljdbc4.jar或sqljdbc.jar(jdk1.7版本)

2、新建类文件ConnectionDB.java

 package hello;

 import java.sql.*;

 /*
  * 连接数据库类
  */
 public class ConnectionDB {

     public ConnectionDB() {

     }

     // 建立与驱动包的联系
     private static final String Drive = "com.microsoft.sqlserver.jdbc.SQLServerDriver";

     // 数据库地址
     private final String URL = "jdbc:sqlserver://localhost:1433;DatabaseName=English";

     // 用户名
     private final String USER = "sa";

     // 密码
     private final String PASSWORD = "940523";

     Connection conn = null; // 定义数据库连接对象

     Statement stmt = null; // 定义SQL命令集对象

     ResultSet rs = null; // 定义结果集对象

     /**
      * 连接数据库
      *
      */
     private Connection getConnection() {
         try {
             // 加载驱动
             Class.forName(Drive);
             // 连接数据库
             conn = DriverManager.getConnection(URL, USER, PASSWORD);
             return conn;
         } catch (Exception e) {
             e.printStackTrace();
             System.out.println("数据库连接失败!");
         }
         return null;
     }

     /**
      * 数据库查询操作
      *
      */
     public void getDateByQuery(String sql) {
         try {
             // 获取盛装SQL语句的载体
             stmt = this.getConnection().createStatement();
             // 获取结果集rs
             rs = stmt.executeQuery(sql);
             // 输出查询结果
             while (rs.next())
                 System.out.println(rs.getInt(1) + "   " + rs.getString(2)
                         + "  " + rs.getString(3));
         } catch (Exception e) {
             e.printStackTrace();
             System.out.println("数据库查询出错!");
         }
     }

     /**
      * 数据库更新操作
      *
      */
     public void getDataByUpdate(String sql) {
         try {
             // 获取盛装SQL语句的载体
             stmt = this.getConnection().createStatement();
             // 获得更新记录条数
             int line = stmt.executeUpdate(sql);
             System.out.println("更新了" + line + "条记录\n");
             // 查询数据库
             String sqlQuery = "select *from word";
             rs = stmt.executeQuery(sqlQuery);
             while (rs.next())
                 System.out.println(rs.getInt(1) + "   " + rs.getString(2)
                         + "  " + rs.getString(3));
         } catch (Exception e) {
             e.printStackTrace();
             System.out.println("数据库更新出错!");
         }

     }

     /**
      * 数据库插入操作
      *
      */
     public void getDataByInsert(String sql) {
         try {
             stmt = this.getConnection().createStatement();
             int line = stmt.executeUpdate(sql);
             System.out.println("插入了" + line + "条记录\n");
             String sqlQuery = "select *from word";
             rs = stmt.executeQuery(sqlQuery);
             while (rs.next())
                 System.out.println(rs.getInt(1) + "   " + rs.getString(2)
                         + "  " + rs.getString(3));
         } catch (Exception e) {
             e.printStackTrace();
             System.out.println("数据库插入出错!");
         }

     }

     /**
      * 数据库删除操作
      */
     public void getDataByDelete(String sql) {
         try {
             stmt = this.getConnection().createStatement();
             int line = stmt.executeUpdate(sql);
             System.out.println("删除了" + line + "条记录\n");
             String sqlQuery = "select *from word";
             rs = stmt.executeQuery(sqlQuery);
             while (rs.next())
                 System.out.println(rs.getInt(1) + "   " + rs.getString(2)
                         + "  " + rs.getString(3));
         } catch (Exception e) {
             e.printStackTrace();
             System.out.println("数据库删除出错!");
         }

     }

     /**
      * 关闭数据库连接
      */
     public void close() {
         try {
             if (rs != null) {
                 rs.close(); // 关闭结果集
             }

             if (stmt != null) {
                 stmt.close();// 关闭盛装SQL语句的载体
             }

             if (conn != null) {
                 conn.close();// 关闭数据库连接
             }
         } catch (SQLException e) {
             e.printStackTrace();
             System.out.println("关闭连接出错!");
             System.exit(0);
         }
     }

 }

简版:

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.Statement;

 public class Test {

     public static void main(String[] args) {
         try {
             // 1.注册驱动
             Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
             // 2.建立连接
             // 2.1连接串
             String conStr = "jdbc:sqlserver://localhost:1433;DatabaseName=JavaDB";

             Connection con = DriverManager.getConnection(conStr, "sa",
                     "123456");
             // 创建会话
             Statement st = con.createStatement();
 //            String sql = "select count(*) as cnt from T_user where username='"
 //                    + username + "' and password='" + password + "'";
             String sql = "select count(*) as cnt from T_user";
             // 结果集
             ResultSet rs = st.executeQuery(sql);
             rs.next();
 //            if (rs.getInt("cnt") > 0) {
 //                System.out.println("登录成功!");
 //            } else {
 //                System.out.println("登录失败!");
 //            }
         } catch (Exception ex) {
             ex.printStackTrace();
         }
     }

 }

3、使用方法：

 public class Main {

     public static void main(String[] args) {
         ConnectionDB db = new ConnectionDB();
         String QuerySql = "select * from word where id=1";
         db.getDateByQuery(QuerySql);
 //        String insertSql="insert into word values('134','boy','男孩')";
 //        db.getDataByInsert(insertSql);

     }

 }