/**
* Insert a record in the database. Any field/value pairs in the specified values HashMap will be
* written into the record with the specified record key.
*
* @param table The name of the table
* @param key The record key of the record to insert.
* @param values A HashMap of field/value pairs to insert in the record
* @return Zero on success, a non-zero error code on error. See this class's description for a
* discussion of error codes.
*/
public int insert(String table, String key, HashMap<String, String> values) {
// Iterate over collection of values, serialize, insert.
StringBuffer data = new StringBuffer();
for (Map.Entry<String, String> entry : values.entrySet()) {
data.append(entry.getKey());
data.append(":");
data.append(entry.getValue());
data.append(";");
}
client.put(key, data.toString());
return 0;
}
/**
* Read a record from the database. Each field/value pair from the result will be stored in a
* HashMap.
*
* @param table The name of the table
* @param key The record key of the record to read.
* @param fields The list of fields to read, or null for all of them
* @param result A HashMap of field/value pairs for the result
* @return Zero on success, a non-zero error code on error or "not found".
*/
public int read(String table, String key, Set<String> fields, HashMap<String, String> result) {
// System.out.println("Reading (client port " + myPort + ")");
String data = client.get(key);
String[] values = data.split(";");
for (int i = 0; i < values.length; i++) {
String[] pair = values[i].split(":");
if (fields != null && (fields.isEmpty() || fields.contains(pair[0]))) {
result.put(pair[0], pair[1]);
}
}
return 0;
}
/**
* Delete a record from the database.
*
* @param table The name of the table
* @param key The record key of the record to delete.
* @return Zero on success, a non-zero error code on error. See this class's description for a
* discussion of error codes.
*/
public int delete(String table, String key) {
client.remove(key);
return 0;
}