1 #ifndef INSPIRCD_SQLAPI_2
2 #define INSPIRCD_SQLAPI_2
10 * This is the voodoo magic which lets us pass multiple
11 * parameters to the SQLrequest constructor... voodoo...
13 #define SQLreq(a, b, c, d, e...) SQLrequest(a, b, c, (SQLquery(d), ##e))
15 /** Identifiers used to identify Request types
17 #define SQLREQID "SQLv2 Request"
18 #define SQLRESID "SQLv2 Result"
19 #define SQLSUCCESS "You shouldn't be reading this (success)"
21 /** Defines the error types which SQLerror may be set to
23 enum SQLerrorNum { NO_ERROR, BAD_DBID, BAD_CONN, QSEND_FAIL, QREPLY_FAIL };
25 /** A list of format parameters for an SQLquery object.
27 typedef std::deque<std::string> ParamL;
29 /** The base class of SQL exceptions
31 class SQLexception : public ModuleException
33 SQLexception(const std::string &reason) : ModuleException(reason)
37 SQLexception() : ModuleException("SQLv2: Undefined exception")
42 /** An exception thrown when a bad column or row name or id is requested
44 class SQLbadColName : public SQLexception
47 SQLbadColName() : SQLexception("SQLv2: Bad column name")
52 /** SQLerror holds the error state of any SQLrequest or SQLresult.
53 * The error string varies from database software to database software
54 * and should be used to display informational error messages to users.
56 class SQLerror : public classbase
65 /** Initialize an SQLerror
66 * @param i The error ID to set
67 * @param s The (optional) error string to set
69 SQLerror(SQLerrorNum i = NO_ERROR, const std::string &s = "")
74 /** Return the ID of the error
81 /** Set the ID of an error
82 * @param i The new error ID to set
83 * @return the ID which was set
85 SQLerrorNum Id(SQLerrorNum i)
91 /** Set the error string for an error
92 * @param s The new error string to set
94 void Str(const std::string &s)
99 /** Return the error string for an error
111 return "Invalid database ID";
113 return "Invalid connection";
115 return "Sending query failed";
117 return "Getting query result failed";
119 return "Unknown error";
124 /** SQLquery provides a way to represent a query string, and its parameters in a type-safe way.
125 * C++ has no native type-safe way of having a variable number of arguments to a function,
126 * the workaround for this isn't easy to describe simply, but in a nutshell what's really
127 * happening when - from the above example - you do this:
129 * SQLrequest foo = SQLreq(this, target, "databaseid", "SELECT (foo, bar) FROM rawr WHERE foo = '?' AND bar = ?", "Hello", "42");
131 * what's actually happening is functionally this:
133 * SQLrequest foo = SQLreq(this, target, "databaseid", query("SELECT (foo, bar) FROM rawr WHERE foo = '?' AND bar = ?").addparam("Hello").addparam("42"));
135 * with 'query()' returning a reference to an object with a 'addparam()' member function which
136 * in turn returns a reference to that object. There are actually four ways you can create a
137 * SQLrequest..all have their disadvantages and advantages. In the real implementations the
138 * 'query()' function is replaced by the constructor of another class 'SQLquery' which holds
139 * the query string and a ParamL (std::deque<std::string>) of query parameters.
140 * This is essentially the same as the above example except 'addparam()' is replaced by operator,(). The full syntax for this method is:
142 * SQLrequest foo = SQLrequest(this, target, "databaseid", (SQLquery("SELECT.. ?"), parameter, parameter));
147 /** The query 'format string'
150 /** The query parameter list
151 * There should be one parameter for every ? character
152 * within the format string shown above.
156 /** Initialize an SQLquery with a given format string only
158 SQLquery(const std::string &query)
163 /** Initialize an SQLquery with a format string and parameters.
164 * If you provide parameters, you must initialize the list yourself
165 * if you choose to do it via this method, using std::deque::push_back().
167 SQLquery(const std::string &query, const ParamL ¶ms)
168 : q(query), p(params)
172 /** An overloaded operator for pushing parameters onto the parameter list
174 SQLquery& operator,(const std::string &foo)
180 /** An overloaded operator for pushing parameters onto the parameter list.
181 * This has higher precedence than 'operator,' and can save on parenthesis.
183 SQLquery& operator%(const std::string &foo)
190 /** SQLrequest is sent to the SQL API to command it to run a query and return the result.
191 * You must instantiate this object with a valid SQLquery object and its parameters, then
192 * send it using its Send() method to the module providing the 'SQL' feature. To find this
193 * module, use Server::FindFeature().
195 class SQLrequest : public Request
198 /** The fully parsed and expanded query string
199 * This is initialized from the SQLquery parameter given in the constructor.
202 /** The database ID to apply the request to
205 /** True if this is a priority query.
206 * Priority queries may 'queue jump' in the request queue.
209 /** The query ID, assigned by the SQL api.
210 * After your request is processed, this will
211 * be initialized for you by the API to a valid request ID,
212 * except in the case of an error.
215 /** If an error occured, error.id will be any other value than NO_ERROR.
219 /** Initialize an SQLrequest.
222 * SQLrequest req = SQLreq(MyMod, SQLModule, dbid, "INSERT INTO ircd_log_actors VALUES('','?')", nick);
224 * @param s A pointer to the sending module, where the result should be routed
225 * @param d A pointer to the receiving module, identified as implementing the 'SQL' feature
226 * @param databaseid The database ID to perform the query on. This must match a valid
227 * database ID from the configuration of the SQL module.
228 * @param q A properly initialized SQLquery object.
230 SQLrequest(Module* s, Module* d, const std::string &databaseid, const SQLquery &q)
231 : Request(s, d, SQLREQID), query(q), dbid(databaseid), pri(false), id(0)
235 /** Set the priority of a request.
237 void Priority(bool p = true)
242 /** Set the source of a request. You should not need to use this method.
244 void SetSource(Module* mod)
251 * This class contains a field's data plus a way to determine if the field
252 * is NULL or not without having to mess around with NULL pointers.
263 * If the field was null
267 /** Initialize an SQLfield
269 SQLfield(const std::string &data = "", bool n = false)
276 /** A list of items which make up a row of a result or table (tuple)
277 * This does not include field names.
279 typedef std::vector<SQLfield> SQLfieldList;
280 /** A list of items which make up a row of a result or table (tuple)
281 * This also includes the field names.
283 typedef std::map<std::string, SQLfield> SQLfieldMap;
285 /** SQLresult is a reply to a previous query.
286 * If you send a query to the SQL api, the response will arrive at your
287 * OnRequest method of your module at some later time, depending on the
288 * congestion of the SQL server and complexity of the query. The ID of
289 * this result will match the ID assigned to your original request.
290 * SQLresult contains its own internal cursor (row counter) which is
291 * incremented with each method call which retrieves a single row.
293 class SQLresult : public Request
296 /** The original query string passed initially to the SQL API
299 /** The database ID the query was executed on
303 * The error (if any) which occured.
304 * If an error occured the value of error.id will be any
305 * other value than NO_ERROR.
309 * This will match query ID you were given when sending
310 * the request at an earlier time.
314 /** Used by the SQL API to instantiate an SQLrequest
316 SQLresult(Module* s, Module* d, unsigned long i)
317 : Request(s, d, SQLRESID), id(i)
322 * Return the number of rows in the result
323 * Note that if you have perfomed an INSERT
324 * or UPDATE query or other query which will
325 * not return rows, this will return the
326 * number of affected rows, and SQLresult::Cols()
327 * will contain 0. In this case you SHOULD NEVER
328 * access any of the result set rows, as there arent any!
329 * @returns Number of rows in the result set.
331 virtual int Rows() = 0;
334 * Return the number of columns in the result.
335 * If you performed an UPDATE or INSERT which
336 * does not return a dataset, this value will
338 * @returns Number of columns in the result set.
340 virtual int Cols() = 0;
343 * Get a string name of the column by an index number
344 * @param column The id number of a column
345 * @returns The column name associated with the given ID
347 virtual std::string ColName(int column) = 0;
350 * Get an index number for a column from a string name.
351 * An exception of type SQLbadColName will be thrown if
352 * the name given is invalid.
353 * @param column The column name to get the ID of
354 * @returns The ID number of the column provided
356 virtual int ColNum(const std::string &column) = 0;
359 * Get a string value in a given row and column
360 * This does not effect the internal cursor.
361 * @returns The value stored at [row,column] in the table
363 virtual SQLfield GetValue(int row, int column) = 0;
366 * Return a list of values in a row, this should
367 * increment an internal counter so you can repeatedly
368 * call it until it returns an empty vector.
369 * This returns a reference to an internal object,
370 * the same object is used for all calls to this function
371 * and therefore the return value is only valid until
372 * you call this function again. It is also invalid if
373 * the SQLresult object is destroyed.
374 * The internal cursor (row counter) is incremented by one.
375 * @returns A reference to the current row's SQLfieldList
377 virtual SQLfieldList& GetRow() = 0;
380 * As above, but return a map indexed by key name.
381 * The internal cursor (row counter) is incremented by one.
382 * @returns A reference to the current row's SQLfieldMap
384 virtual SQLfieldMap& GetRowMap() = 0;
387 * Like GetRow(), but returns a pointer to a dynamically
388 * allocated object which must be explicitly freed. For
389 * portability reasons this must be freed with SQLresult::Free()
390 * The internal cursor (row counter) is incremented by one.
391 * @returns A newly-allocated SQLfieldList
393 virtual SQLfieldList* GetRowPtr() = 0;
396 * As above, but return a map indexed by key name
397 * The internal cursor (row counter) is incremented by one.
398 * @returns A newly-allocated SQLfieldMap
400 virtual SQLfieldMap* GetRowMapPtr() = 0;
403 * Overloaded function for freeing the lists and maps
404 * returned by GetRowPtr or GetRowMapPtr.
405 * @param fm The SQLfieldMap to free
407 virtual void Free(SQLfieldMap* fm) = 0;
410 * Overloaded function for freeing the lists and maps
411 * returned by GetRowPtr or GetRowMapPtr.
412 * @param fl The SQLfieldList to free
414 virtual void Free(SQLfieldList* fl) = 0;