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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