iOS中FMDB的使用【单例】

DYDB.h

Objective-C

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#import <Foundation/Foundation.h> #import <FMDB/FMDatabase.h> @interface DYDB : NSObject { } @property(nonatomic, readonly) FMDatabase *database; + (DYDB *) sharedDB; - (FMDatabase *) connect; - (void) clearDB; @end

DYDB.m

Objective-C

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#import “DYDB.h” #define kDYDBObvName @”dyobv.sqlite” @implementation DYDB static DYDB *_sharedDB; + (DYDB *) sharedDB { if (!_sharedDB) { _sharedDB = [[DYDB alloc] init]; } return _sharedDB; } - (id) init { self = [super init]; if (self) { NSString* docsdir = [NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; NSString *dbpath = [docsdir stringByAppendingPathComponent:kDYDBObvName]; DLog(@”database file path: %@”, dbpath); _database = [FMDatabase databaseWithPath:dbpath]; } return self; } - (FMDatabase *) connect { if ([_database open]) { return _database; } DLog(@”fail to open db…”); return nil; } - (void) clearDB { dispatch_async(dispatch_get_main_queue(), ^{ if([_database close]) { _database = nil; } }); } @end

DYLogKeeper+DB.h

Objective-C

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#import “DYLogKeeper.h” #import <FMDB/FMDatabase.h> DYLogKeeper * rs2logkeeper(FMResultSet *rs); @interface DYLogKeeper (DB) + (void) createSqliteTable; + (BOOL) insert: (DYLogKeeper *) logkeeper; + (BOOL) updateContent: (NSString *) content localId: (NSString *) localId; + (BOOL) remove: (DYLogKeeper *) logkeeperId; + (DYLogKeeper *) findById: (NSString *) localId; + (NSArray *) findOfStartDate: (NSDate *) start toDate:(NSDate *) toDate; @end

DYLogKeeper+DB.m

Objective-C

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#import “DYLogKeeper+DB.h” #import “DYDB.h” #import <FMDB/FMDatabase.h> #import “DYUUID.h” #import “NSDate+NSDateFormaterCategory.h” DYLogKeeper * rs2logkeeper(FMResultSet *rs) { DYLogKeeper *obj = [[DYLogKeeper alloc] init]; obj.localId = [rs stringForColumn:@”local_id”]; obj.logkeeperId = [rs stringForColumn:@”logkeeper_id”]; obj.addtime = [rs dateForColumn:@”add_time”]; obj.content = [rs stringForColumn:@”content”]; obj.deviceId = [rs stringForColumn:@”device_id”]; obj.deviceType = [rs intForColumn:@”device_type”]; obj.channel = [rs intForColumn:@”channel”]; return obj; } @implementation DYLogKeeper (DB) + (void) createSqliteTable { DLog(@”check table is exists?”); FMDatabase *db = [[DYDB sharedDB] connect]; NSString *existsSql = [NSString stringWithFormat:@”select count(name) as countNum from sqlite_master where type = ‘table’ and name = ‘%@’”, @”log_keepers” ]; DLog(@”%@”, existsSql); FMResultSet *rs = [db executeQuery:existsSql]; if ([rs next]) { NSInteger count = [rs intForColumn:@”countNum”]; DLog(@”The table count: %d”, count); if (count == 1) { DLog(@”log_keepers table is existed.”); return; } DLog(@”log_keepers is not existed.”); } [rs close]; DLog(@”create table ….”); NSString *filePath = [[NSBundle mainBundle] pathForResource:@”log_keepers_table” ofType:@”sql”]; DLog(@”logkeeper sql file: %@”, filePath); NSError *error; NSString *sql = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error]; if (error != nil) { DLog(@”fail to read sql file: %@”, [error description]); return; } DLog(@”—sql: %@”, sql); DLog(@”execute sql ….”); if([db executeUpdate:sql]) { DLog(@”create table succes….”); } else { DLog(@”fail to execute update sql..”); } [db close]; } + (BOOL) insert: (DYLogKeeper *) logkeeper { DLog(@”insert logkeeper”); DLog(@”convert int value to NSNumber …”); logkeeper.localId = [DYUUID uuidString]; NSNumber *channelNum = [NSNumber numberWithInt:logkeeper.channel]; DLog(@”— channelNum: %@”, channelNum); NSNumber *typeNumber = [NSNumber numberWithInt:logkeeper.deviceType]; DLog(@”— deviceType: %@”, typeNumber); NSString *sql = @”insert into log_keepers(local_id, logkeeper_id, add_time, content, device_id, device_type, channel) values(?, ?, ?, ?, ?, ?, ?)”; FMDatabase *db = [[DYDB sharedDB] connect]; if (db == nil) { DLog(@”fail to create db..”); } BOOL ret = [db executeUpdate:sql, logkeeper.localId, logkeeper.logkeeperId, logkeeper.addtime, logkeeper.content, logkeeper.deviceId, typeNumber, channelNum]; [db close]; return ret; } + (BOOL) updateContent:(NSString *)content localId: (NSString *)localId { DLog(@”update logkeeper content”); NSString *sql = @”update log_keepers set content = ? where local_id = ?”; FMDatabase *db = [[DYDB sharedDB] connect]; BOOL ret = [db executeUpdate:sql, content, localId]; [db close]; return ret; } - (BOOL) remove: (DYLogKeeper *) logkeeper { DLog(@”remove logkeeper: %@”, logkeeper.localId); NSString *sql = @”delete from log_keepers where local_id = ?”; FMDatabase *db = [[DYDB sharedDB] connect]; BOOL ret = [db executeUpdate:sql, logkeeper.localId]; [db close]; return ret; } - (DYLogKeeper *) findById:(NSString *)localId { DLog(@”find logkeeper by id: %@”, localId); FMDatabase *db = [[DYDB sharedDB] connect]; FMResultSet *rs = [db executeQuery:@”select * from log_keepers where local_id = ?”, localId]; DYLogKeeper *ret; if ([rs next]) { ret = rs2logkeeper(rs); } [db close]; return ret; } + (NSArray *) findOfStartDate: (NSDate *) start toDate:(NSDate *) toDate { DLog(@”find logkeeper between date ….”); NSString *sql = @”select * from log_keepers where add_time between ? and ?”; FMDatabase *db = [[DYDB sharedDB] connect]; FMResultSet *rs = [db executeQuery:sql, start, toDate]; NSMutableArray *array = [NSMutableArray arrayWithCapacity:32]; while ([rs next]) { DYLogKeeper *logkeeper = rs2logkeeper(rs); [array addObject:logkeeper]; } [rs close]; [db close]; return array; } @end

DYLogKeeper.h

Objective-C

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#import <Foundation/Foundation.h> @interface DYLogKeeper : NSObject @property(strong, nonatomic) NSString *localId; @property(strong, nonatomic) NSDate *addtime; @property(strong, nonatomic) NSString *deviceId; @property(strong, nonatomic) NSString *content; @property(strong, nonatomic) NSString *logkeeperId; @property(nonatomic) int deviceType; @property(nonatomic) int channel; @end

原文出自：https://gist.github.com/lvjian700/6113564