Java 连接 SqlServer工具类

1.下载 server2008R2驱动jar包

http://www.microsoft.com/zh-cn/download/confirmation.aspx?id=21599

2.代码实现

1）实体：

package entity;

import java.io.Serializable;

import java.util.Date;

public class User implements Serializable{

    private int id;

    private String username;

    private String password;

    private Date createtime;

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

    public Date getCreatetime() {

        return createtime;

    }

    public void setCreatetime(Date createtime) {

        this.createtime = createtime;

    }

    public User(int id, String username, String password, Date createtime) {

        super();

        this.id = id;

        this.username = username;

        this.password = password;

        this.createtime = createtime;

    }

    public User(String username, String password, Date createtime) {

        super();

        this.username = username;

        this.password = password;

        this.createtime = createtime;

    }

    public User() {

        super();

    }

    @Override

    public String toString() {

        return "User [id=" + id + ", username=" + username + ", password="

                + password + ", createtime=" + createtime + "]";

    }

}

2.dao

package dao;

import java.util.List;

import entity.User;

public interface UserDao {

    public void add(User u);

    public User getByUsername(String username);

    public void update(User u);

    public void delete(String username);

    public List<User> findAll();

}

3.ImplDao

package daoImpl;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import jdbcutil.JdbcUtil;

import dao.UserDao;

import entity.User;

public class UserDaoImpl implements UserDao {

    @Override

    public void add(User u) {

        Connection con = null;

        PreparedStatement stmt = null;

        ResultSet rs = null;

        try {

            con = JdbcUtil.getConnection();

            String sql = "insert into [user](username,password,createtime) values(?,?,?)";

            stmt= con.prepareStatement(sql);

            stmt.setString(1, "test");

            stmt.setString(2,"123456");

            stmt.setDate(3, new java.sql.Date(u.getCreatetime().getTime()));

            stmt.executeUpdate();

        } catch (Exception e) {

            e.printStackTrace();

        }finally

        {

            JdbcUtil.close(rs, stmt, con);

        }

    }

    @Override

    public User getByUsername(String username) {

        Connection con = null;

        PreparedStatement stmt = null;

        ResultSet rs = null;

        try {

            con = JdbcUtil.getConnection();

            String sql = "select * from [user] where username=?";

            stmt = con.prepareStatement(sql);

            stmt.setString(1, username);

            rs = stmt.executeQuery();

            while(rs.next())

            {

                int id = rs.getInt("id");

                String name = rs.getString("username");

                String password = rs.getString("password");

                Date time = rs.getDate("createtime");

                User u = new User(id,username,password,time);

                return u;

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

        finally

        {

            JdbcUtil.close(rs, stmt, con);

        }

        return null;

    }

    @Override

    public void update(User u) {

        Connection con = null;

        PreparedStatement stmt = null;

        ResultSet rs = null;

        try {

            con = JdbcUtil.getConnection();

            String sql = "update [user] set password=? where username=?";

            stmt = con.prepareStatement(sql);

            stmt.setString(1, u.getPassword());

            stmt.setString(2, u.getUsername());

            stmt.executeUpdate();

        } catch (Exception e) {

            e.printStackTrace();

        }

        finally

        {

            JdbcUtil.close(rs, stmt, con);

        }

    }

    @Override

    public void delete(String username) {

        Connection con = null;

        PreparedStatement stmt = null;

        ResultSet rs = null;

        try {

            con = JdbcUtil.getConnection();

            String sql = "delete from [user] where username=?";

            stmt = con.prepareStatement(sql);

            stmt.setString(1,username);

            stmt.executeUpdate();

        } catch (Exception e) {

            e.printStackTrace();

        }

        finally

        {

            JdbcUtil.close(rs, stmt, con);

        }

    }

    @Override

    public List<User> findAll() {

        List<User> list = new ArrayList<User>();

        Connection con = null;

        PreparedStatement stmt = null;

        ResultSet rs = null;

        try {

            con = JdbcUtil.getConnection();

            String sql = "select * from [user]";

            stmt = con.prepareStatement(sql);

            rs = stmt.executeQuery();

            while(rs.next())

            {

                User u = new User(rs.getInt("id"), rs.getString("username"),rs.getString("password"),rs.getDate("createtime"));

                list.add(u);

            }

            return list;

        } catch (Exception e) {

            e.printStackTrace();

        }

        finally

        {

                JdbcUtil.close(rs, stmt, con);

        }

        return null;

    }

}

4.JDBC工具类

package jdbcutil;

import java.io.InputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.Properties;

public class JdbcUtil {

    private static String className;

    private static String url;

    private static String user;

    private static String password;

    static

    {

        try {

            InputStream in = JdbcUtil.class.getClassLoader().getResourceAsStream("dbinfo.properties");

            Properties props = new Properties();

            props.load(in);

            className = props.getProperty("className");

            url = props.getProperty("url");

            user = props.getProperty("user");

            password = props.getProperty("password");

            //System.out.println(className);

            //System.out.println(url);

            //注册驱动

            Class.forName(className);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    public static Connection getConnection() throws Exception

    {

        return DriverManager.getConnection(url, user, password);

    }

    public static void close(ResultSet rs, Statement stmt,Connection con)

    {

        if(rs!=null)

        {

            try {

                rs.close();

            } catch (SQLException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            rs= null;

        }

        if(stmt!=null)

        {

            try {

                stmt.close();

            } catch (SQLException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            stmt= null;

        }

        if(con!=null)

        {

            try {

                con.close();

            } catch (SQLException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            con= null;

        }

    }

}

5.用于测试SQLServer驱动是否正确

package test;

import java.sql.Connection;

import java.sql.DriverManager;

public class JdbcTest {

    public static void test()

    {

        Connection conn = null;

        try {

            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

            //注意url中没有microsoft才能使用，网上增加了microsoft的会出现No suitable driver found for//jdbc:microsoft:sqlserver:……的错误

            //若安装多个实例时，要确认相应的port及实例名

            String url="jdbc:sqlserver://localhost:1433;DatabaseName=JavaTestDB";

            String user="sa";

            String password="123456";

            conn= DriverManager.getConnection(url,user,password);

            System.out.println("链接成功");

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        finally

        {

            if(conn!=null)

            {

                try {

                    conn.close();

                } catch (Exception e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

                conn = null;

            }

        }

    }

}

备注： dbinfo.properties文件：

6.添加SQLServer jar包

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