FMDB使用Queue:FMDatabaseQueue

使用 result:( void (^)( BOOL sucess))done是判断上一次block执行完成，才能执行下一个，不然不会造成死锁

在使用时，如果在queue里面的block执行过程中，又调用了 indatabase方法，则会检查 是不是同一个queue，如果是同一个queue会死锁；原因很简单：

队列里面 放了一个block，该block又在 本队列 后面放了一个 block；

从而：前一个block 里面 调用了 后一个block，必须等后一个block执行完成了，

前一个block才会 出队列；

而后一个block想要执行，则又必须先等 前一个block出队列；

因此 死锁！！！！

/**

 * @ 函数名称： saveUDFmdbContent:toTable:
 * @ 函数描述：保存数据到数据库指定的表
 * @ 输入参数： model ，要保存的数据，类型默认为 NSDictionary
            tableName ：遥操作的表
 * @ 输出参数： nil
 * @ 返回值：   nil
 */

- ( void )saveUDFmdbContent:( id )model toTable:( NSString *)tableName
{
    [ self saveUDFmdbContent :model toTable :tableName result :^( BOOL sucess) {
        if (sucess)
        {
            [[ NSNotificationCenter defaultCenter ] postNotificationName : kChatListChangeNotification object : nil ] ;
        }
    }];
}

- ( void )saveUDFmdbContent:( id )model toTable:( NSString *)tableName result:( void (^)( BOOL sucess))done
{
    __block BOOL is_exculate_success = NO ;
    _tableName = tableName;
    NSMutableString * query = [ NSMutableString stringWithFormat : @"INSERT INTO %@" ,tableName];
    NSMutableString * keys = [ NSMutableString stringWithFormat : @" (" ];
    NSMutableString * values = [ NSMutableString stringWithFormat : @" ( " ];
    NSMutableArray * arguments = [ NSMutableArray arrayWithCapacity : 0 ];
    if ([model allKeys ]) {
        for ( NSString * key in [model allKeys ]) {
            [keys appendFormat : @"%@," ,key];
            [values appendString : @"?," ];
            [arguments addObject :[model objectForKey :key]];
        }
    }
    [keys appendString : @")" ];
    [values appendString : @")" ];
    [query appendFormat : @" %@ VALUES%@" ,
     [keys stringByReplacingOccurrencesOfString : @",)" withString : @")" ],
     [values stringByReplacingOccurrencesOfString : @",)" withString : @")" ]];
    [ _db inDatabase :^( FMDatabase *db) {
        @try {
            BOOL savebool = [db executeUpdate :query withArgumentsInArray :arguments];
            is_exculate_success = YES ;
            if (savebool)
            {
                NSLog ( @" 保存成功 " );
               
            }
        }
        @catch (NSException *exception) {
            [db rollback ];
            is_exculate_success = NO ;
        }
        @finally {
            [db commit ];
        }
    }];
    if (done)
    {
        done(is_exculate_success);
    }

}

#pragma mark - 删除数据

/**
 * @函数名称：deleteDateRecordWithField:Value:
 * @函数描述：从默认表中删除数据
 * @输入参数：field/value :指定删除条件field = 'value'
 * @输出参数：nil
 * @返回值：  BOOL
 *           成功：YES  失败：NO
 */
//删除数据
- (void)deleteDateRecordWithField:(NSString *)field Value:(id)value
{
    [self deleteDateRecordFromTable:_tableName Field:field Value:value];
}

/**
 * @函数名称：deleteDateRecordFromTable:Field:Value:
 * @函数描述：从指定表中删除数据
 * @输入参数：field/value :指定删除条件field = 'value'
             tableName:制定操作的表
 * @输出参数：nil
 * @返回值：  BOOL
 *           成功：YES  失败：NO
 */
- (void)deleteDateRecordFromTable:(NSString *)tableName Field:(NSString *)field Value:(id)value
{
    [self deleteDateRecordFromTable:tableName Field:field Value:value result:^(BOOL sucess) {
        if (sucess)//上一个block执行完成
        {
//            [[NSNotificationCenter defaultCenter] postNotificationName:kChatListChangeNotification object:nil] ;
        }
    }];
}
- (void)deleteDateRecordFromTable:(NSString *)tableName Field:(NSString *)field Value:(id)value  result:(void(^)(BOOL sucess))done
{
    __block BOOL is_exculate_success = NO;
    _tableName = tableName;
    NSString * query = [NSString stringWithFormat:@"DELETE FROM %@ WHERE %@ = '%@'",tableName,field,value];
   
    [_db inDatabase:^(FMDatabase *db) {
        @try {
            BOOL deletebool = [db executeUpdate:query];
            is_exculate_success = YES;
            if (deletebool)
            {
                NSLog(@"删除成功");
            }
            else
            {
                NSLog(@"删除失败");
            }
        }
        @catch (NSException *exception) {
            [db rollback];
            is_exculate_success = NO;
        }
        @finally {
            [db commit];
        }
       
    }];
    if (done)
    {
        done(is_exculate_success);
    }
   

}

#pragma mark - 更新数据

//更新数据，调用当前表
- (void)updateDataRecordWithField:(NSString *)field Value:(id)value Model:(id)model
{
    [self updateDataRecordWithTableName:_tableName field:field value:value model:model];
}

/**
 * @函数名称：updateDataRecordWithTableName:Field:Value:model:
 * @函数描述：向指定表中更新数据，先根据条件搜索，没有插入，有，更新
 * @输入参数：field/value :根据条件field = 'value'查找要更新的数据
            tableName:制定操作的表
            model:更新内容，默认dictionary类型
 * @输出参数：nil
 * @返回值：  BOOL
 *           成功：YES  失败：NO
 */

//更新特定条件的数据
- (void)updateDataRecordWithTableName:(NSString *)tableName field:(NSString *)field value:(id)value model:(id)model
{
    //success：block是否执行完成  exist：如果不存在更新数据，执行插入操作
    [self updateDataRecordWithTableName:tableName field:field value:value model:model result:^(BOOL sucess, BOOL exist)
    {
        //block执行完成
        if (sucess)
        {
            if (exist)
            {
                [[NSNotificationCenter defaultCenter] postNotificationName:kChatListChangeNotification object:nil] ;
            }
            else
            {
                [self saveUDFmdbContent:model toTable:tableName];
            }
        }
       
    }];
}
- (void)updateDataRecordWithTableName:(NSString *)tableName field:(NSString *)field value:(id)value model:(id)model result:(void(^)(BOOL sucess, BOOL exist))done
{
    __block BOOL is_exculate_success = NO;
    __block BOOL is_exist = NO;
    if (!model)
    {
        return;
    }
    NSString * sql = [NSString stringWithFormat:@"SELECT * FROM %@ WHERE %@ = '%@'",tableName,field,value];
    [_db inDatabase:^(FMDatabase *db) {
        @try {
            FMResultSet * rs = [db executeQuery:sql];
            while ([rs next])
            {
                is_exist = YES;
                NSString * query = [NSString stringWithFormat:@"UPDATE %@ SET",tableName];
                NSMutableString * temp = [NSMutableString stringWithCapacity:0];
                if ([model allKeys]) {
                    for (NSString * key in [model allKeys]) {
                        [temp appendFormat:@" %@ = '%@',",key,[model objectForKey:key]];
                    }
                }
                [temp appendString:@")"];
                query = [query stringByAppendingFormat:@"%@ WHERE %@ = '%@'",[temp stringByReplacingOccurrencesOfString:@",)" withString:@""],field,value];
                BOOL updatebool = [db executeUpdate:query];
                is_exculate_success = YES;
                if (updatebool)
                {
                    NSLog(@"更新成功");
                }
                break;
            }
            [rs close];
            if (!is_exist) {
                is_exculate_success = YES;
            }
        }
        @catch (NSException *exception) {
            [db rollback];
            is_exculate_success = NO;
        }
        @finally {
            [db commit];
        }
    }];
    if (done)
    {
        done(is_exculate_success,is_exist);
    }
   
}
#pragma mark - 查找数据

- (NSArray *)searchDataSourceWithField:(NSString *)field Value:(id)value
{
    return [self searchDataSourceWithTableName:_tableName Field:field Value:value Limit:0 OrderKey:nil Ascending:YES];
}

- (NSArray *)searchDataSourceWithTableName:(NSString *)tableName Field:(NSString *)field Value:(id)value
{
    return [self searchDataSourceWithTableName:tableName Field:field Value:value Limit:0 OrderKey:nil Ascending:YES];
}

- (NSArray *)searchDataSourceWithLimit:(NSInteger)limit
{
    return [self searchDataSourceWithTableName:_tableName Field:nil Value:nil Limit:limit OrderKey:nil Ascending:YES];
}

- (NSArray *)searchDataSourceWithTableName:(NSString *)tableName Limit:(NSInteger)limit
{
    return [self searchDataSourceWithTableName:_tableName Field:nil Value:nil Limit:limit OrderKey:nil Ascending:YES];
}

- (NSArray *)searchDataSourceWithField:(NSString *)field Value:(id)value Limit:(NSInteger)limit  OrderKey:(NSString *)orderKey Ascending:(BOOL)isascend
{
    return [self searchDataSourceWithTableName:_tableName Field:field Value:value Limit:limit OrderKey:orderKey Ascending:isascend];
}


/**
 * @函数名称：searchDataSourceWithTableName:Field:Value:Limit:OrderKey:Ascending:
 * @函数描述：从指定表中查找符合条件的数据
 * @输入参数：field/value :根据条件field = 'value'查找数据
            tableName:制定操作的表
             limit：要返回的数量，不指定默认为0，返回所有
             orderKey/isascend：指定排序的键值和排序方式，默认升序
 * @输出参数：nil
 * @返回值：  NSArray:查找到的符合条件的数组
 */

- (NSArray *)searchDataSourceWithTableName:(NSString *)tableName Field:(NSString *)field Value:(id)value Limit:(NSInteger)limit OrderKey:(NSString *)orderKey Ascending:(BOOL)isascend
{
    _tableName = tableName;
    NSString * query = [NSString stringWithFormat:@"SELECT * FROM %@",tableName];
   
    if (field && value)
    {
        query = [query stringByAppendingFormat:@" WHERE %@ = '%@'",field,value];
    }
    if (orderKey)
    {
        if (isascend)
        {
            query = [query stringByAppendingFormat:@" ORDER BY %@",orderKey];
        }
        else
        {
            query = [query stringByAppendingFormat:@" ORDER BY %@ DESC",orderKey];
        }
    }
   
    if (limit > 0)
    {
        query = [query stringByAppendingFormat:@" limit %zd",limit];
    }
    NSMutableArray * array = [NSMutableArray arrayWithCapacity:0];
    [_db inDatabase:^(FMDatabase *db) {
        FMResultSet * rs = [db executeQuery:query];

        while ([rs next])
        {
            if ([self.delegate respondsToSelector:@selector(receiveSearchResult:)]) {
                id model = [self.delegate receiveSearchResult:rs];
                [array addObject:model];
            }
        }
        [rs close];
       
    }];
    return array;
}