我有几种方法可以做同样的事情,当与 MySQL 数据库连接时,保存或加载不同类型的参数。目前,我对每种类型都有不同的方法。如何组合这些方法以便它们支持不同的类型?
下面是两个非常相似但使用不同类型的方法的示例:
public static void saveLongArray(Connection con, int playerID, String tableName, String fieldName, long[] array, long[] originalArray) {
try {
for (int i = 0; i < array.length; i++) {
// Check for change before running query
if (array[i] != originalArray[i]) {
if (array[i] != 0 && array[i] != -1) {
PreparedStatement updateQuery = con.prepareStatement("REPLACE INTO `" + tableName + "` (`player_id`, `index`, `" + fieldName + "`) VALUES(?, ?, ?)");
updateQuery.setInt(1, playerID);
updateQuery.setInt(2, i);
updateQuery.setLong(3, array[i]);
updateQuery.execute();
} else {
PreparedStatement deleteQuery = con.prepareStatement("DELETE FROM `" + tableName + "` WHERE `player_id` = ? AND `index` = ?");
deleteQuery.setInt(1, playerID);
deleteQuery.setInt(2, i);
deleteQuery.execute();
}
originalArray[i] = array[i];
}
}
} catch (SQLException ex) {
Logger.getLogger(PlayerSaveHandler.class.getName()).log(Level.SEVERE, "SQL Exception while saving a long array!", ex);
}
}
public static void saveIntArray(Connection con, int playerID, String tableName, String fieldName, int[] array, int[] originalArray) {
try {
for (int i = 0; i < array.length; i++) {
// Check for change before running query
if (array[i] != originalArray[i]) {
if (array[i] != 0 && array[i] != -1) {
PreparedStatement updateQuery = con.prepareStatement("REPLACE INTO `" + tableName + "` (`player_id`, `index`, `" + fieldName + "`) VALUES(?, ?, ?)");
updateQuery.setInt(1, playerID);
updateQuery.setInt(2, i);
updateQuery.setInt(3, array[i]);
updateQuery.execute();
} else {
PreparedStatement deleteQuery = con.prepareStatement("DELETE FROM `" + tableName + "` WHERE `player_id` = ? AND `index` = ?");
deleteQuery.setInt(1, playerID);
deleteQuery.setInt(2, i);
deleteQuery.execute();
}
originalArray[i] = array[i];
}
}
} catch (SQLException ex) {
Logger.getLogger(PlayerSaveHandler.class.getName()).log(Level.SEVERE, "SQL Exception while saving an int array!", ex);
}
}
请注意,在该示例中,类型都是数字类型。在类型完全不同的情况下(例如 int 和 String),我可以做什么来避免接近重复的方法?