解决 java.sql.SQLException: Before start of result set

java中使用如下代码做数据库连接，用以查询数据

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try {

Class.forName("com.mysql.jdbc.Driver");

String connectionUrl = "jdbc:mysql://127.0.0.1:3306/base_company";

conn = DriverManager.getConnection(connectionUrl,"root","root");

stmt = conn.createStatement();

String sqlString="SELECT count(1) as trueorfalse from base_user where usercode='"+name+"' and password='"+pwd+"';";

System.out.println(sqlString);

rs=stmt.executeQuery(sqlString);

while(rs.next())

{

result=rs.getString("trueorfalse");

}

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

 

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缺少红色文字部分就会出现 java.sql.SQLException: Before start of result set异常，原因貌似是因为到了最后一条记录