List >相關

2016年8月6日13:53:00

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List<Map<String, Object>> List集合新增列

則需要：

List<Map<String, Object>> list_new = new ArrayList<Map<String, Object>>();

//新建list集合對象，用於存儲新的數據

for (Map<String, Object> map : list) {//list為數據庫查詢出來的數據
　　Long jxjhid=Long.valueOf(map.get("jxjhid").toString());

　　//上面的是獲取jxjh的值

　　String mc_new="";

　　if(jxjhid==1){

　　　　mc_new="計划";

　　}else{

　　　　mc_new="不計划";

　　}
　　
　　map.put("sfjh", mc_new);
　　list_new .add(map);
}
//另外一種方式
//不要下面兩行代碼

List<Map<String, Object>> list_new = new ArrayList<Map<String, Object>>();　　
list_new .add(map);

 

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List<Map<String, Object>> List集合刪除map中的某個元素

粒子：

List<Map<String, Object>> list_new = new ArrayList<Map<String, Object>>();
Map<String, Object> map1=new HashMap<String, Object>();
map1.put("ks", "01");
map1.put("js", "10");
list_new.add(map1);
Map<String, Object> map2=new HashMap<String, Object>();
map2.put("ks", "01");
map2.put("js", "10");
list_new.add(map2);

for (Map<String, Object> map : list_new) {
    map.remove("js");
}

List<Map<String, Object>> List集合修改map中的元素

粒子：

List<Map<String, Object>> list_new = new ArrayList<Map<String, Object>>();
Map<String, Object> map1=new HashMap<String, Object>();
map1.put("ks", "01");
map1.put("js", "10");
list_new.add(map1);
Map<String, Object> map2=new HashMap<String, Object>();
map2.put("ks", "01");
map2.put("js", "10");
list_new.add(map2);

for (Map<String, Object> map : list_new) {
    map.put("js","11");
}

List<Map<String, Object>> List集合查詢數據庫數據

//公司wh框架的使用方法
String sql="select * from jxap " 
//  + " left outer join (select jxjhid,ks from jxjh) jxjh on jxjh.jxjhid=jxap.jxjhid"
    + " where jxap.jlztm=51 and jxap.bjid=:bjid and jxap.jxjhid in(select jxjhid from jxjh where xqm=:xqm )";
SqlCommandImpl sci=new SqlCommandImpl(sql);
sci.setInt("bjid", bjid);
sci.setInt("xqm", xqm);
List<Map<String, Object>> list=gdba.selectAsMapList(sci,jxap);

//普通的框架
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
　// 關閉連接flag
boolean colseFlag = false;
  // 打開DB鏈接
if (this.connection == null) {
  this.connection = this.getDbConnection();
  colseFlag = true;
}
PreparedStatement preStat = null;
preStat = this.connection.prepareStatement(sql);
ResultSet rs = null;
Map<String, Object> map = null;

rs = preStat.executeQuery();
  // 生成ResultSetMetaData
ResultSetMetaData rsMeta = preStat.getMetaData();
while (rs.next()) {
   map = this.Result2Map(rs, rsMeta);
   // 追加到list中
   list.add(map);
  }