Question

public class UserSearchDAO {


public ArrayList searchRecords(UserDTO udto) throws SQLException{

    DriverManager.registerDriver(new com.mysql.jdbc.Driver());
    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/msdb","root","root");
    udto.getDate();
    }
    //elseif(udto.getDate()!=null && !udto.getDate().equals("")){
        //query = query+ "where date="+udto.getDate();

    System.out.println(query);
    Statement stmt = con.createStatement();
    ResultSet rs = stmt.executeQuery(query);
    ArrayList list = new ArrayList();




}

//这是获取familyno和date字段中记录的DAO层。你能帮我解决一下如何编写正确的查询。我是新数据库。

query = query +＆＃34; familyno =＆＃34; + udto.getFamilyno（），udto.getDate（）;

Answer 1

一般格式，

query =select * from  table_name where table_col1="+getvalue1()+" && table_col2="+getvalue2()+";

为了你的数据库，

query="select * from  userVO where familyno="+udto.getFamilyno()+" && date="+udto.getDate()+";";

where条件获取日期在两列family no和date

1 个答案: