数据库连接

Question

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

String url="jdbc:sqlserver://localhost:1433;databaseName=ABC2015121029";

String user="sa";

String pass="1997520";

Connection con=null;

Statement stmt=null;

ResultSet rs=null;

con=DriverManager.getConnection(url, user, pass);

stmt=con.createStatement();

String sql="select * from 学生";

rs=stmt.executeQuery(sql);

为什么连接不上数据库