如何使用 FMDB 从 sqlite 检索数据并保存在数组中

Question

我已成功将数据保存在 sqlite db 中，但我无法将这些数据保存在数组中。

- (void) createEventTable {

[self createAndDropTablesWithQuery:[NSString stringWithFormat:@"create table if not exists BEACONDATA (rowID integer primary key AUTOINCREMENT, beaconid text)"]];

}

-(void)insertData:(NSArray *)beacon_data
{
    [self createEventTable];
    
    [instance.database open];
    BOOL isInserted;
    @autoreleasepool
    {
        isInserted=[instance.database executeUpdate:@"insert into BEACONDATA (beaconid) values (?)",[NSString stringWithFormat:@"(%@)",beacon_data]];
    } 

[instance.database close];

if(isInserted)
    NSLog(@"Inserted Successfully");
else
    NSLog(@"Error occurred while inserting");

[self displayData];
 }

 -(void)displayData
{

[instance.database open];


FMResultSet *resultSet=[instance.database executeQuery:@"SELECT * FROM BEACONDATA"];
NSMutableArray *array_lastname=[[NSMutableArray alloc]init];

if(resultSet)
{
    while([resultSet next])
        
     NSLog(@"Beacon data %@",[resultSet stringForColumn:@"beaconid"]);

}

}

输出：

Beacon data (01000444)
Beacon data (01000466)
Beacon data (01000001)
Beacon data (01000468)
Beacon data (01000004)
Beacon data (01000006)
Beacon data (01000003)

如何将这些数据保存在数组中我尝试了很多方法但没有成功，如果您有任何想法，请提供帮助。我是 sqlite 新手。

Answer 1

FMResultSet 有实例方法resultDictionary 会给你NSDictionary 的记录。所以你可以在你的数组中添加那个字典的对象。

NSMutableArray *array = [[NSMutableArray alloc]init];
if(resultSet) {
while([resultSet next]) {
    NSDictionary *dict = [resultSet resultDictionary];
    [array addObject:dict];

    //Or if you want to add simply `beaconid` to array then it should be simply
    [array addObject: [resultSet stringForColumn:@"beaconid"]];
}