使用JDBC连接数据库，查询结果转成List或者Map(臃肿版)
/**
* 把查询的结果转换成List
*
* @param rs
* @return list
*/
protected List<Map<String, Object>> fullToList(ResultSet rs) {
ArrayList list = new ArrayList();
try {
int iColumn = rs.getMetaData().getColumnCount();
while (rs.next()) {
Map<String, Object> map = new LinkedHashMap<String, Object>();
for (int i = 1; i <= iColumn; i++) {
String tmpkey = rs.getMetaData().getColumnName(i);// 通过索引找到行的名字
String[] tmps = tmpkey.split("_");// 分割所有含"_"字符，返回数组
String key = "";
for (int j = 0; j < tmps.length; j++) {
if (j == 0) {
key += tmps[j].toLowerCase();// 转换为小写
} else {
key += tmps[j].substring(0, 1).toUpperCase() + tmps[j].substring(1).toLowerCase();
}
}
Object val = null;
// switch行类型
switch (rs.getMetaData().getColumnType(i)) {
case Types.DATE:
val = rs.getDate(i);
break;
case Types.DOUBLE:
if (rs.getObject(i) == null)
val = null;
else
val = rs.getDouble(i);
break;
case Types.NUMERIC:
if (rs.getObject(i) == null)
val = null;
else
val = rs.getDouble(i);
break;
case Types.DECIMAL:
if (rs.getObject(i) == null)
val = null;
else
val = rs.getDouble(i);
break;
case Types.INTEGER:
if (rs.getObject(i) == null)
val = null;
else
val = rs.getInt(i);
break;
default:
val = rs.getString(i);
break;
}
if (null != val) {
// map找找不到指定键便设置个
if (!map.containsKey(key)) {
map.put(key, val);
}
}
}
list.add(map);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (rs != null)
rs.close();
rs = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
/**
* 把查询的结果转换成Map
* @param rs
* @return map
*/
protected Map<String, Object> fullToMap(ResultSet rs) {
Map<String, Object> map = new TreeMap<String, Object>();
try {
int iColumn = rs.getMetaData().getColumnCount();
while (rs.next()) {
for (int i = 1; i <= iColumn; i++) {
String tmpkey = rs.getMetaData().getColumnName(i);
String[] tmps = tmpkey.split("_");
String key = "";
for (int j = 0; j < tmps.length; j++) {
if (j == 0) {
key += tmps[j].toLowerCase();
} else {
key += tmps[j].substring(0, 1).toUpperCase() + tmps[j].substring(1).toLowerCase();
}
}
Object val = null;
switch (rs.getMetaData().getColumnType(i)) {
case Types.DATE:
val = rs.getDate(i);
break;
default:
val = rs.getString(i);
break;
}
if (null != val) {
if (!map.containsKey(key)) {
map.put(key, val);
}
}
}
break;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (rs != null)
rs.close();
rs = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
return map;
}