????????????ORM??????????????????????????????????????????????Java???δ???ù???????????????????ù???.
???????ù???????????:
????1: ???????????????
????2: ?????????????.
???????????????????:
????1: ???:
????public static <T> T Cast(Class<T> t?? Object value)
????2: ????:????????????????????????????????￡???????????????null???????????????????????.
??????????????????????????????????????int???????0????????sql????У???????????????????????С??0?????????Select Count(1) from table1?????????.
????3: ???:
/**
* ???????
* @param t
* @param value
* @return
*/
@SuppressWarnings("unchecked")
public static <T> T Cast(Class<T> t?? Object value) {
if (value == null) {
return GetDefault(t);
}
if (t == Object.class) {
return (T)value;
}
try
{
return Cast_i(t?? value);
} catch(Exception ex) {
ex.printStackTrace();
return GetDefault(t);
}
}
private static String GetStr(Class<?> t?? Object value) {
if (value == null) {
return "";
}
if (t == String.class){
return (String)value;
}else {
return value.toString();
}
}
@SuppressWarnings("unchecked")
private static <T> T Cast_i(Class<T> t?? Object value) {
Class<?> objClass = value.getClass();
if (t == String.class) {
return (T)GetStr(objClass?? value);
}
if (t == int.class) {
if (objClass == int.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
Object ret = Integer.parseInt(text);
return (T)ret;
}
if (t == Integer.class) {
if (objClass == Integer.class) {
return (T)value;
}
if (objClass == int.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
Object ret = Integer.parseInt(text);
return (T)ret;
}
if (t == short.class) {
if (objClass == int.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
Object ret = Short.parseShort(text);
return (T)ret;
}
if (t == boolean.class || t == Boolean.class) {
if (objClass == int.class) {
Object ret = (int)value >= 1? true:false;
return (T)ret;
}
if (objClass == Integer.class) {
Object ret = (Integer)value >= 1? true:false;
return (T)ret;
}
String text = GetStr(objClass?? value);
Object ret = Integer.parseInt(text);
ret = (int)ret >= 1? true:false;
return (T)ret;
}
if (t == long.class) {
if (objClass == long.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
Object ret = Long.parseLong(text);
return (T)ret;
}
if (t == byte.class) {
if (objClass == byte.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
Object ret = Byte.parseByte(text);
return (T)ret;
}
if (t == double.class) {
if (objClass == double.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
Object ret = Double.parseDouble(text);
return (T)ret;
}
if (t == float.class) {
if (objClass == float.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
Object ret = Float.parseFloat(text);
return (T)ret;
}
if (t == BigDecimal.class) {
if (objClass == BigDecimal.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
return (T)new BigDecimal(text);
}
if (t == java.util.Date.class){
if (objClass == java.util.Date.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
return (T)HiTypeHelper.Convert2Date(text);
}
if (t == java.sql.Date.class){
if (objClass == java.sql.Date.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
return (T)HiTypeHelper.Convert2SqlDate(text);
}
if (t == Time.class) {
if (objClass == Time.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
Object ret = HiTypeHelper.Convert2Date(text).getTime();
return (T)ret;
}
if (t == Timestamp.class) {
if (objClass == Timestamp.class) {
return (T)value;
}
String text = GetStr(objClass?? value);
return (T)Timestamp.valueOf(text);
}
return (T)value;
}