/**
 * SQLX - Newer version of SQL stuff
 */

#if defined _sqlx_included
  #endinput
#endif
#define _sqlx_included

#if AMXX_VERSION_NUM >= 175
 #pragma reqclass sqlx
 #if !defined AMXMODX_NOAUTOLOAD
  #pragma defclasslib sqlx mysqlx
 #endif //!defined AMXMODX_NOAUTOLOAD
#endif //AMXX_VERSION_NUM

enum Handle
{
   Empty_Handle
};

/**
 * Creates a connection tuple.
 * This tuple must be passed into connection routines.
 * Freeing the tuple is not necessary, but is a good idea if you 
 *  create many of them.  You can cache these handles globally.
 */
native Handle:SQL_MakeDbTuple(const host[], const user[], const pass[], const db[]);


/**
 * Frees an SQL handle.
 * The handle can be to anything (tuple, connection, query, results, etc).
 * If you free a database connection, it closes the connection as well.
 */
native SQL_FreeHandle(Handle:h);


/**
 * Opens a database connection.
 * Returns an SQL handle, which must be freed.
 * Returns Empty_Handle on failure.
 */
native Handle:SQL_Connect(Handle:cn_tuple, &errcode, error[], maxlength);


/**
 * Prepares a query.
 * The query must always be freed.
 * This does not actually do the query!
 */
native Handle:SQL_PrepareQuery(Handle:db, const fmt[], {Float,_}:...);

#define TQUERY_CONNECT_FAILED	-2
#define TQUERY_QUERY_FAILED	-1
#define TQUERY_SUCCESS		0
/**
 * Prepares and executes a threaded query.
 * This will not interrupt gameplay in the event of a poor/lossed 
 *  connection, however, the interface is more complicated and 
 *  asynchronous.  Furthermore, a new connection/disconnection is 
 *  made each time.
 * The handler should look like:
 *
 * @param failstate - One of the three TQUERY_ defines.
 * @param query - Handle to the query, do not free it.
 * @param error - An error message, if any.
 * @param errnum - An error code, if any.
 * @param data - Data array you passed in.
 * @param size - Size of the data array you passed in.
 * 
 * public QueryHandler(failstate, Handle:query, error[], errnum, data[], size)
 *
 * Note! The handle does not need to be freed.
 * Also note: This function is not guaranteed to be in another thread
 *  (in fact - it's not).  You're seeing data "after the fact", 
 *  and as such to execute another query you should run 
 *  SQL_ThreadQuery again.
 * 
 */
native SQL_ThreadQuery(Handle:cn_tuple, const handler[], const query[], const data[]="", dataSize=0);


/**
 * Executes a query.
 * Returns 1 if the query succeeded.
 * Returns 0 if the query failed.
 * NOTE: You can call this multiple times as long as its parent
 *  connection is kept open.  Each time the result set will be freed
 *  from the previous call.
 */
native SQL_Execute(Handle:query);

/**
 * Gets information about a failed query error.
 * Returns the errorcode.
 */
native SQL_QueryError(Handle:query, error[], maxlength);


/**
 * Returns 1 if there are more results to be read,
 *  0 otherwise.
 */
native SQL_MoreResults(Handle:query);


/**
 * Tells whether a specific column in the current row
 *  is NULL or not.
 */
native SQL_IsNull(Handle:query, column);

/**
 * Retrieves the current result.
 * A successful query starts at the first result,
 *  so you should not call SQL_NextRow() first.
 * Passing no extra params - return int
 * Passing one extra param - return float in 1st extra arg
 * Passing two extra params - return string in 1st arg, max length in 2nd
 * Example:
 *  new num = SQL_ReadResult(query, 0)
 *  new Float:num2
 *  new str[32]
 *  SQL_ReadResult(query, 1, num2)
 *  SQL_ReadResult(query, 2, str, 31)
 */
native SQL_ReadResult(Handle:query, column, ...);


/**
 * Advances to the next result (return value should be ignored).
 */
native SQL_NextRow(Handle:query);


/** 
 * Returns the number of affected rows.
 */
native SQL_AffectedRows(Handle:query);


/**
 * Returns the number of rows total.
 */
native SQL_NumResults(Handle:query);


/**
 * Returns the number of columns total.
 */
native SQL_NumColumns(Handle:query);


/** 
 * Returns the name of a column.
 * Errors on a bad field number.
 */
native SQL_FieldNumToName(Handle:query, num, name[], maxlength);


/**
 * Returns the number of a named column, or -1 if not found.
 */
native SQL_FieldNameToNum(Handle:query, const name[]);

/**
 * Returns which driver this plugin is currently bound to.
 */
native SQL_GetAffinity(driver[], maxlen);

/**
 * Sets driver affinity.  You can use this to force a particular 
 *  driver implementation.  This will automatically change all SQL
 *  natives in your plugin to be "bound" to the module in question.
 * If no such module is found, it will return 0.
 * Note, that using this while you have open handles to another database 
 *  type will cause problems.  I.e., you cannot open a handle, switch
 *  affinity, then close the handle with a different driver.
 * Switching affinity is an O(n*m) operation, where n is the number of
 *  SQL natives and m is the number of used natives in total.
 * Intuitive programmers will note that this causes problems for threaded queries.
 *  You will have to either force your script to work under one affinity, or to 
 *  pack the affinity type into the query data, check it against the current, then
 *  set the new affinity if necessary.  Then, restore the old for safety.
 */
native SQL_SetAffinity(const driver[]);

/**
 * This function can be used to find out if a table in a Sqlite database exists.
 * (updated for newer API)
 */
stock bool:sqlite_TableExists(Handle:db, const table[])
{
	new Handle:query = SQL_PrepareQuery(
					db,
					"SELECT name FROM sqlite_master WHERE type='table' AND name='%s' LIMIT 1;", 
					table);
					
	if (!SQL_Execute(query) || !SQL_NumResults(query))
	{
		SQL_FreeHandle(query);
		return false;
	}
	
	SQL_FreeHandle(query);

	return true;
}

/**
 * Use this for executing a query where you don't care about the result.
 * Returns 0 on failure, 1 on success
 */
stock SQL_SimpleQuery(Handle:db, const query[], error[]="", maxlength=0, &rows=0)
{
	new Handle:hQuery = SQL_PrepareQuery(db, "%s", query);
	
	if (!SQL_Execute(hQuery))
	{
		SQL_QueryError(hQuery, error, maxlength);
		SQL_FreeHandle(hQuery)
		return 0;
	}
	
	rows = SQL_NumResults(hQuery)
	
	SQL_FreeHandle(hQuery);
	
	return 1
}