将数据放入hashmap而不覆盖

Question

我希望从DB.resulset获取的hashmap中添加值有2行数据。但是它的覆盖首先添加了行值。

这是我的代码。

        Statement s1 = con.createStatement();
        ResultSet rs1 = s1.executeQuery("SELECT * FROM garantee WHERE loanapplicationid ='" + applicationid + "'");
        ResultSetMetaData garanteeMetaData = rs1.getMetaData();
        int garanteeColumns = garanteeMetaData.getColumnCount();
        HashMap<String, String> garanteeFull = new HashMap<String, String>();
        while (rs1.next()) {
            int j = 1;
            for (int i = 1; i < garanteeColumns; i++) {
                garanteeFull.put(garanteeMetaData.getColumnLabel(i) + j, rs1.getString(i));
                System.out.println(rs1.getString(i));
            }
            j++;
        }

我使用int j来改变键值。但是它不起作用corectly.please帮助我。如何做到

**抱歉英文不好

Answer 1

我认为你应该在循环之外使用以下行，因为无论何时它进入循环，j的值每次变为1。

int j = 1;

请尝试使用以下代码替换您的代码..

    Statement s1 = con.createStatement();
    ResultSet rs1 = s1.executeQuery("SELECT * FROM garantee WHERE loanapplicationid ='" + applicationid + "'");
    ResultSetMetaData garanteeMetaData = rs1.getMetaData();
    int garanteeColumns = garanteeMetaData.getColumnCount();
    HashMap<String, String> garanteeFull = new HashMap<String, String>();
    int j = 1;
    while (rs1.next()) {

        for (int i = 1; i < garanteeColumns; i++) {
            garanteeFull.put(garanteeMetaData.getColumnLabel(i) + j, rs1.getString(i));
            System.out.println(rs1.getString(i));
        }
        j++;
    }