iOS學習筆記（十六）——資料庫操作(使用FMDB)

FMDB (https://github.com/ccgus/fmdb

FMResultSet ：執行查詢一個FMDatabase結果集，這個和android的Cursor類似。
FMDatabaseQueue ：在多個線程來執行查詢和更新時會使用這個類。

 

db = [FMDatabase databaseWithPath:database_path];

 

。

 

[db open]

返回BOOL型。

 

 

[db close]

 

 

 

if ([db open]) {        NSString *sqlCreateTable =  [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS '%@' ('%@' INTEGER PRIMARY KEY AUTOINCREMENT, '%@' TEXT, '%@' INTEGER, '%@' TEXT)",TABLENAME,ID,NAME,AGE,ADDRESS];        BOOL res = [db executeUpdate:sqlCreateTable];        if (!res) {            NSLog(@"error when creating db table");        } else {            NSLog(@"success to creating db table");        }        [db close];    }

 

 

 if ([db open]) {        NSString *insertSql1= [NSString stringWithFormat:                               @"INSERT INTO '%@' ('%@', '%@', '%@') VALUES ('%@', '%@', '%@')",                               TABLENAME, NAME, AGE, ADDRESS, @"張三", @"13", @"濟南"];        BOOL res = [db executeUpdate:insertSql1];        NSString *insertSql2 = [NSString stringWithFormat:                                @"INSERT INTO '%@' ('%@', '%@', '%@') VALUES ('%@', '%@', '%@')",                                TABLENAME, NAME, AGE, ADDRESS, @"李四", @"12", @"濟南"];        BOOL res2 = [db executeUpdate:insertSql2];                if (!res) {            NSLog(@"error when insert db table");        } else {            NSLog(@"success to insert db table");        }        [db close];    }

 

 

if ([db open]) {        NSString *updateSql = [NSString stringWithFormat:                               @"UPDATE '%@' SET '%@' = '%@' WHERE '%@' = '%@'",                               TABLENAME,   AGE,  @"15" ,AGE,  @"13"];        BOOL res = [db executeUpdate:updateSql];        if (!res) {            NSLog(@"error when update db table");        } else {            NSLog(@"success to update db table");        }        [db close];    }

 

 

if ([db open]) {                NSString *deleteSql = [NSString stringWithFormat:                               @"delete from %@ where %@ = '%@'",                               TABLENAME, NAME, @"張三"];        BOOL res = [db executeUpdate:deleteSql];                if (!res) {            NSLog(@"error when delete db table");        } else {            NSLog(@"success to delete db table");        }        [db close];    }

 

 

if ([db open]) {        NSString * sql = [NSString stringWithFormat:                          @"SELECT * FROM %@",TABLENAME];        FMResultSet * rs = [db executeQuery:sql];        while ([rs next]) {            int Id = [rs intForColumn:ID];            NSString * name = [rs stringForColumn:NAME];            NSString * age = [rs stringForColumn:AGE];            NSString * address = [rs stringForColumn:ADDRESS];            NSLog(@"id = %d, name = %@, age = %@  address = %@", Id, name, age, address);        }        [db close];    }

 

 

 FMDatabaseQueue * queue = [FMDatabaseQueue databaseQueueWithPath:database_path];    dispatch_queue_t q1 = dispatch_queue_create("queue1", NULL);    dispatch_queue_t q2 = dispatch_queue_create("queue2", NULL);        dispatch_async(q1, ^{        for (int i = 0; i < 50; ++i) {            [queue inDatabase:^(FMDatabase *db2) {                                NSString *insertSql1= [NSString stringWithFormat:                                       @"INSERT INTO '%@' ('%@', '%@', '%@') VALUES (?, ?, ?)",                                       TABLENAME, NAME, AGE, ADDRESS];                                NSString * name = [NSString stringWithFormat:@"jack %d", i];                NSString * age = [NSString stringWithFormat:@"%d", 10+i];                                                BOOL res = [db2 executeUpdate:insertSql1, name, age,@"濟南"];                if (!res) {                    NSLog(@"error to inster data: %@", name);                } else {                    NSLog(@"succ to inster data: %@", name);                }            }];        }    });        dispatch_async(q2, ^{        for (int i = 0; i < 50; ++i) {            [queue inDatabase:^(FMDatabase *db2) {                NSString *insertSql2= [NSString stringWithFormat:                                       @"INSERT INTO '%@' ('%@', '%@', '%@') VALUES (?, ?, ?)",                                       TABLENAME, NAME, AGE, ADDRESS];                                NSString * name = [NSString stringWithFormat:@"lilei %d", i];                NSString * age = [NSString stringWithFormat:@"%d", 10+i];                                BOOL res = [db2 executeUpdate:insertSql2, name, age,@"北京"];                if (!res) {                    NSLog(@"error to inster data: %@", name);                } else {                    NSLog(@"succ to inster data: %@", name);                }            }];        }    });

 

@張興業TBOW（#->@）

 

 

 

 

https://github.com/ccgus/fmdb