java连接sqlserver数据库,java连接sqlserver数据库失败
java连接sqlserver数据库代码
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String sqlDriver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String url="jdbc:sqlserver://localhost:1433;DatabaseName=自己的数据库名字";
String user="用户名";
String password="密码";
Connection conn=null;
try{
Class.forName(sqlDriver).newInstance();
conn=DriverManager.getConnection(url,user,password);
// out.println("数据库加载成功");
}catch(Exception e){
// out.println("数据库加载出现错误！");
}
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java如何连接SQLserver数据库?
注意：在使用这个类的时候，先将对应数据库的驱动包（JAR包），复制进项目的WebRoot文件夹下的WEB-INF文件夹下的lib文件夹下，切记必须要对应的JAR包，否则无法使用数据库的
import java.sql.*;
public class BaseDAO {
private static final String DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";//注意：此驱动是SQL2005及以上版本的导入驱动包连接字符串
private static final String CONNECTION = "jdbc:sqlserver://localhost:1433;databaseName=Employee"; //数据库连接字符串，databaseName就是你要连接的数据库名，
private static final String NAME = "sa"; //数据库用户名
private static final String PWD = "sa"; //数据库密码
public static Connection GetConnection() {
Connection con = null;
try {
Class.forName(DRIVER);
con = DriverManager.getConnection(CONNECTION, NAME, PWD);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return con;
}
public static void close(ResultSet rs, PreparedStatement ps, Connection con) {
try {
if (null != rs) {
rs.close();
}
if (null != ps) {
ps.close();
}
if (null != con) {
con.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
java连接数据库的代码
用这个类吧.好的话,给我加加分.
import java.sql.*;
/**
* @功能: 一个JDBC的本地化API连接类,封装了数据操作方法,只用传一个SQL语句即可
* @作者: 李开欢
* @日期: 2007/
*/
public class ConnectionDemo {
/*
* 这里可以将常量全部放入另一个类中,以方便修改
*/
private static Connection conn;
private static Statement ps;
private static ResultSet rs;
private static final String DRIVER = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
private static final String URL = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb";
private static final String USER ="sa";
private static final String PASS = "sa";
public ConnectionDemo() {
// TODO Auto-generated constructor stub
ConnectionDemo.getConnection();
}
public static Connection getConnection(){
System.out.println("连接中...");
try {
Class.forName(ConnectionDemo.DRIVER);
conn = DriverManager.getConnection(ConnectionDemo.URL, ConnectionDemo.USER, ConnectionDemo.PASS);
System.out.println("成功连接");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
public static Statement getStatement(String sql){
System.out.println("执行SQL语句中...");
try {
ps = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
if(sql.substring(0, 6).equals("select")){
rs = ps.executeQuery(sql);
System.out.println("执行完查询操作,结果已返回ResultSet集合");
}else if(sql.substring(0, 6).equals("delete")){
ps.executeUpdate(sql);
System.out.println("已执行完毕删除操作");
}else if(sql.substring(0, 6).equals("insert")){
ps.executeUpdate(sql);
System.out.println("已执行完毕增加操作");
}else{
ps.executeUpdate(sql);
System.out.println("已执行完毕更新操作");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ps;
}
public static ResultSet getResultSet(){
System.out.println("查询结果为:");
return rs;
}
public static void closeConnection(){
System.out.println("关闭连接中...");
try {
if (rs != null) {
rs.close();
System.out.println("已关闭ResultSet");
}
if (ps != null) {
ps.close();
System.out.println("已关闭Statement");
}
if (conn != null) {
conn.close();
System.out.println("已关闭Connection");
}
} catch (Exception e) {
// TODO: handle exception
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
ConnectionDemo.getConnection();
String sql = "delete from type where id = 1";
ConnectionDemo.getStatement(sql);
String sql2 = "insert into type values(1,'教学设备')";
ConnectionDemo.getStatement(sql2);
String sql1 = "select * from type";
ConnectionDemo.getStatement(sql1);
ResultSet rs = ConnectionDemo.getResultSet();
System.out.println("编号 "+"类 型");
try {
while(rs.next()){
System.out.print(" "+rs.getInt(1)+" ");
System.out.println(rs.getString(2));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ConnectionDemo.closeConnection();
}
}
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