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FMDatabasePool.h
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//
// FMDatabasePool.h
// fmdb
//
// Created by August Mueller on 6/22/11.
// Copyright 2011 Flying Meat Inc. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "sqlite3.h"
@class FMDatabase;
/** Pool of `<FMDatabase>` objects.
### See also
- `<FMDatabaseQueue>`
- `<FMDatabase>`
@warning Before using `FMDatabasePool`, please consider using `<FMDatabaseQueue>` instead.
If you really really really know what you're doing and `FMDatabasePool` is what
you really really need (ie, you're using a read only database), OK you can use
it. But just be careful not to deadlock!
For an example on deadlocking, search for:
`ONLY_USE_THE_POOL_IF_YOU_ARE_DOING_READS_OTHERWISE_YOULL_DEADLOCK_USE_FMDATABASEQUEUE_INSTEAD`
in the main.m file.
*/
@interface FMDatabasePool : NSObject {
NSString *_path;
dispatch_queue_t _lockQueue;
NSMutableArray *_databaseInPool;
NSMutableArray *_databaseOutPool;
__unsafe_unretained id _delegate;
NSUInteger _maximumNumberOfDatabasesToCreate;
int _openFlags;
}
/** Database path */
@property (atomic, retain) NSString *path;
/** Delegate object */
@property (atomic, assign) id delegate;
/** Maximum number of databases to create */
@property (atomic, assign) NSUInteger maximumNumberOfDatabasesToCreate;
/** Open flags */
@property (atomic, readonly) int openFlags;
///---------------------
/// @name Initialization
///---------------------
/** Create pool using path.
@param aPath The file path of the database.
@return The `FMDatabasePool` object. `nil` on error.
*/
+ (instancetype)databasePoolWithPath:(NSString*)aPath;
/** Create pool using path and specified flags
@param aPath The file path of the database.
@param openFlags Flags passed to the openWithFlags method of the database
@return The `FMDatabasePool` object. `nil` on error.
*/
+ (instancetype)databasePoolWithPath:(NSString*)aPath flags:(int)openFlags;
/** Create pool using path.
@param aPath The file path of the database.
@return The `FMDatabasePool` object. `nil` on error.
*/
- (instancetype)initWithPath:(NSString*)aPath;
/** Create pool using path and specified flags.
@param aPath The file path of the database.
@param openFlags Flags passed to the openWithFlags method of the database
@return The `FMDatabasePool` object. `nil` on error.
*/
- (instancetype)initWithPath:(NSString*)aPath flags:(int)openFlags;
///------------------------------------------------
/// @name Keeping track of checked in/out databases
///------------------------------------------------
/** Number of checked-in databases in pool
@returns Number of databases
*/
- (NSUInteger)countOfCheckedInDatabases;
/** Number of checked-out databases in pool
@returns Number of databases
*/
- (NSUInteger)countOfCheckedOutDatabases;
/** Total number of databases in pool
@returns Number of databases
*/
- (NSUInteger)countOfOpenDatabases;
/** Release all databases in pool */
- (void)releaseAllDatabases;
///------------------------------------------
/// @name Perform database operations in pool
///------------------------------------------
/** Synchronously perform database operations in pool.
@param block The code to be run on the `FMDatabasePool` pool.
*/
- (void)inDatabase:(void (^)(FMDatabase *db))block;
/** Synchronously perform database operations in pool using transaction.
@param block The code to be run on the `FMDatabasePool` pool.
*/
- (void)inTransaction:(void (^)(FMDatabase *db, BOOL *rollback))block;
/** Synchronously perform database operations in pool using deferred transaction.
@param block The code to be run on the `FMDatabasePool` pool.
*/
- (void)inDeferredTransaction:(void (^)(FMDatabase *db, BOOL *rollback))block;
#if SQLITE_VERSION_NUMBER >= 3007000
/** Synchronously perform database operations in pool using save point.
@param block The code to be run on the `FMDatabasePool` pool.
@return `NSError` object if error; `nil` if successful.
@warning You can not nest these, since calling it will pull another database out of the pool and you'll get a deadlock. If you need to nest, use `<[FMDatabase startSavePointWithName:error:]>` instead.
*/
- (NSError*)inSavePoint:(void (^)(FMDatabase *db, BOOL *rollback))block;
#endif
@end
/** FMDatabasePool delegate category
This is a category that defines the protocol for the FMDatabasePool delegate
*/
@interface NSObject (FMDatabasePoolDelegate)
/** Asks the delegate whether database should be added to the pool.
@param pool The `FMDatabasePool` object.
@param database The `FMDatabase` object.
@return `YES` if it should add database to pool; `NO` if not.
*/
- (BOOL)databasePool:(FMDatabasePool*)pool shouldAddDatabaseToPool:(FMDatabase*)database;
/** Tells the delegate that database was added to the pool.
@param pool The `FMDatabasePool` object.
@param database The `FMDatabase` object.
*/
- (void)databasePool:(FMDatabasePool*)pool didAddDatabase:(FMDatabase*)database;
@end