让JFinal更好的支持oracle日期时间字段

在尝试用JFinal做一个小项目，测试的时候发现对oracle时间字段有些没做转换，现在修改源代码如下所述。

1、修改core下的TypeConverter类，这个类是对前台Model的类型自动转换，而对于oracle的Date和Timestamp来说，是符合clazz == java.sql.Timestamp.class，而当界面输入日期不带时间，会转换格式错误，采用类似clazz == java.sql.Date.class的判断来做统一修改(clazz == java.sql.Time.class也顺带修改)。

else if (clazz == java.sql.Time.class) {
//    result = java.sql.Time.valueOf(s);
      result = new java.sql.Time(new SimpleDateFormat(timePattern).parse(s).getTime());
 }
// mysql type: timestamp, datetime
else if (clazz == java.sql.Timestamp.class) {
//    result = java.sql.Timestamp.valueOf(s);
      if (s.length() >= timeStampLen) {
        	result = new java.sql.Timestamp(new SimpleDateFormat(timeStampPattern).parse(s).getTime());
      } else {
        	result = new java.sql.Timestamp(new SimpleDateFormat(datePattern).parse(s).getTime());
      }
}

2、修改com.jfinal.plugin.activerecord下的TableInfoBuilder类，扫描表结构类型，这里会把oracle的timestamp类型当作string处理，在124行附件新增一条else if语句。

else if (type == Types.TIMESTAMP) {
	result.addInfo(colName, java.sql.Timestamp.class);
}

3、DbKit类新增3个方法，用来替换rs.getObject()获取结果集的值，是从spring jdbc中摘取过来的，还是蛮好用的，后面用来替换Db类等用到获取结果集值。

@SuppressWarnings("rawtypes")
	public static Object getResultSetValue(ResultSet rs, int index, Class requiredType) throws SQLException {
		if (requiredType == null) {
			return getResultSetValue(rs, index);
		}

		Object value = null;
		boolean wasNullCheck = false;

		// Explicitly extract typed value, as far as possible.
		if (String.class.equals(requiredType)) {
			value = rs.getString(index);
		}
		else if (boolean.class.equals(requiredType) || Boolean.class.equals(requiredType)) {
			value = rs.getBoolean(index);
			wasNullCheck = true;
		}
		else if (byte.class.equals(requiredType) || Byte.class.equals(requiredType)) {
			value = rs.getByte(index);
			wasNullCheck = true;
		}
		else if (short.class.equals(requiredType) || Short.class.equals(requiredType)) {
			value = rs.getShort(index);
			wasNullCheck = true;
		}
		else if (int.class.equals(requiredType) || Integer.class.equals(requiredType)) {
			value = rs.getInt(index);
			wasNullCheck = true;
		}
		else if (long.class.equals(requiredType) || Long.class.equals(requiredType)) {
			value = rs.getLong(index);
			wasNullCheck = true;
		}
		else if (float.class.equals(requiredType) || Float.class.equals(requiredType)) {
			value = rs.getFloat(index);
			wasNullCheck = true;
		}
		else if (double.class.equals(requiredType) || Double.class.equals(requiredType) ||
				Number.class.equals(requiredType)) {
			value = rs.getDouble(index);
			wasNullCheck = true;
		}
		else if (byte[].class.equals(requiredType)) {
			value = rs.getBytes(index);
		}
		else if (java.sql.Date.class.equals(requiredType)) {
			value = rs.getDate(index);
		}
		else if (java.sql.Time.class.equals(requiredType)) {
			value = rs.getTime(index);
		}
		else if (java.sql.Timestamp.class.equals(requiredType) || java.util.Date.class.equals(requiredType)) {
			value = rs.getTimestamp(index);
		}
		else if (BigDecimal.class.equals(requiredType)) {
			value = rs.getBigDecimal(index);
		}
		else if (Blob.class.equals(requiredType)) {
			value = rs.getBlob(index);
		}
		else if (Clob.class.equals(requiredType)) {
			value = rs.getClob(index);
		}
		else {
			// Some unknown type desired -> rely on getObject.
			value = getResultSetValue(rs, index);
		}

		// Perform was-null check if demanded (for results that the
		// JDBC driver returns as primitives).
		if (wasNullCheck && value != null && rs.wasNull()) {
			value = null;
		}
		return value;
	}

public static Object getResultSetValue(ResultSet rs, int index) throws SQLException {
		Object obj = rs.getObject(index);
		String className = null;
		if (obj != null) {
			className = obj.getClass().getName();
		}
		if (obj instanceof Blob) {
			obj = rs.getBytes(index);
		}
		else if (obj instanceof Clob) {
			obj = rs.getString(index);
		}
		else if (className != null &&
				("oracle.sql.TIMESTAMP".equals(className) ||
				"oracle.sql.TIMESTAMPTZ".equals(className))) {
			obj = rs.getTimestamp(index);
		}
		else if (className != null && className.startsWith("oracle.sql.DATE")) {
			String metaDataClassName = rs.getMetaData().getColumnClassName(index);
			if ("java.sql.Timestamp".equals(metaDataClassName) ||
					"oracle.sql.TIMESTAMP".equals(metaDataClassName)) {
				obj = rs.getTimestamp(index);
			}
			else {
				obj = rs.getDate(index);
			}
		}
		else if (obj != null && obj instanceof java.sql.Date) {
			if ("java.sql.Timestamp".equals(rs.getMetaData().getColumnClassName(index))) {
				obj = rs.getTimestamp(index);
			}
		}
		return obj;
	}

public static String lookupColumnName(ResultSetMetaData resultSetMetaData, int columnIndex) throws SQLException {
		String name = resultSetMetaData.getColumnLabel(columnIndex);
		if (name == null || name.length() < 1) {
			name = resultSetMetaData.getColumnName(columnIndex);
		}
		return name;
	}

4、修改com.jfinal.plugin.activerecord下的ModelBuilder类，用上面3个方法来修改build方法，并注释掉buildLabelNamesAndTypes方法。

List<T> result = new ArrayList<T>();
		ResultSetMetaData rsmd = rs.getMetaData();
		int columnCount = rsmd.getColumnCount();
		while (rs.next()) {
			Model<?> ar = modelClass.newInstance();
			Map<String, Object> attrs = ar.getAttrs();
			for (int i=1; i<=columnCount; i++) {
				Object value = DbKit.getResultSetValue(rs, i);
				attrs.put(DbKit.lookupColumnName(rsmd, i), value);
			}
			result.add((T)ar);
		}

同样修改com.jfinal.plugin.activerecord下的RecordBuilder类

for (int i=1; i<=columnCount; i++) {
			Object value = DbKit.getResultSetValue(rs, i);
			columns.put(DbKit.lookupColumnName(rsmd, i), value);
		}

5、修改Db类中为rs.getObject，并不需要每个都替换

53行：temp[i] = DbKit.getResultSetValue(rs, i + 1);
60行：result.add(DbKit.getResultSetValue(rs, 1));