java - SQL Server 存储过程和 jdbc

Question

我正在努力使用 SQL Server 2005 和 JDBC。我有一个存储过程:

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER proc [dbo].[sp_logincheck]
    @username as nvarchar(50),
    @password as nvarchar(50)
as
begin
    select * 
    from users 
    where user_name = @username 
      and password = @password 
      and is_active = 'Yes'
end

我的User类是:

import java.sql.*;

public class User {
    private String username;

    private User(String username){
        this.username = username;
    }

    public static User login(String username, char [] password) throws SQLException{
        if(username == null || password == null){
            throw new IllegalArgumentException("Illegal arguments passed to method");
        }
        if(login1(username, password)){
            return new User(username);
        }
        return null;
    }

    private static boolean login1(String username, char [] password) throws SQLException{
        Connection connection = null;
        CallableStatement statement = null;
        try{
            connection = DriverManager.getConnection(AppParameters.dbURL, AppParameters.dbUsername, AppParameters.dbPassword);
        }catch(SQLException e){
            throw e;
        }
        try{
            statement = connection.prepareCall("{ ? = call dbo.sp_logincheck(?,?) }");
            statement.registerOutParameter(1, Types.INTEGER);
            statement.setString(2, username);
            statement.setString(3, new String(password));
            statement.execute();
            if(statement.getInt(1) == 1){
                System.out.println("Login Successfull");
                return true;
            }
            System.out.println("Login Failed");
            return false;
        }catch(SQLException sqle){
            sqle.printStackTrace();
            throw sqle;
        }finally{
            try{
                statement.close();
            }catch(Exception e){
            }
            try{
                connection.close();
            }catch(Exception e){
            }
        }
    }

    public  String getUsername(){
        return username;
    }
}

调用login()方法总是打印Login Failed。如何使用SQL Server中的存储过程并使用JDBC来执行用户登录？或者使用原始 SQL 语句更好？请指导我。

编辑:

我还想知道如何从上述存储过程中获取 ResultSet，因为我在存储过程中有一个 select 查询。

Answer 1

尝试以下操作:

ResultSet rs = statement.executeQuery();
if (! rs.isLast()) {
    // match
} else {
    // no match
}

此外，我建议仅选择计数(select count(*) as cnt from ...)，并使用类似 int count = rs.next() 的方法。 getInt("cnt");