IOS的一个数据库方法
我在IOS编程使用的FMDatabase这个sqlite框架，需要客户端与服务器做一些数据同步工作，有时得执行比较多的命令（增删改表当然是手写，但如果要手写插入几百上千条记录是很不现实的，也只需要用php从mysql中读取记录便可），而且因为客户端的缘故，mysql数据库里的一些字段并不需要写入到客户端的sqlite中，所以我们可以用PHP写一个接口页面，以JSON传递我们希望传达的数据，然后再在客户端进行处理。 传递的数据有两种格式，一种是直接执行的命令，我把它存放在“query”数组当中，另一种是要插入的记录，把它存放在“record”当中。“query”中的的命令直接执行，而“record”里的记录以“key”=>“value”的方式，在客户端循环出SQL语句执行。 $update_array['database']['query'] = array(); $update_array['table']['wares_category']['query'] = array(); $update_array['table']['wares_category']['record'] = $all_wares_category; //客户端的同步函数 -(void)databaseUpdate { FMDatabase *db = [self getDatabase]; NSURL *updateUrl = [[NSURL alloc]initWithString:[Api stringByAppendingPathComponent:@"databaseUpdate/databaseupdate"]]; NSData *updateData = [[NSData alloc]initWithContentsOfURL:updateUrl]; NSError *error = nil; NSDictionary *updateDictionary = [NSJSONSerialization JSONObjectWithData:updateData options:NSJSONReadingMutableContainers error:&error]; int i; //database数组 if([[[updateDictionary objectForKey:@"database"]objectForKey:@"query"] count] > 0){ for (i = 0; i < [[[updateDictionary objectForKey:@"database"]objectForKey:@"query"] count]; i++){ NSString *query = [[[updateDictionary objectForKey:@"database"]objectForKey:@"query"]objectAtIndex:i]; [db executeUpdate:query]; } } //table数组 if([[updateDictionary objectForKey:@"table"] count] > 0){ for(id tableName in [updateDictionary objectForKey:@"table"]){ if([[[[updateDictionary objectForKey:@"table"] objectForKey:tableName] objectForKey:@"query"] count] > 0){ for (i = 0; i < [[[[updateDictionary objectForKey:@"table"] objectForKey:tableName] objectForKey:@"query"] count]; i++){ NSString *query = [[[[updateDictionary objectForKey:@"table"] objectForKey:tableName] objectForKey:@"query"]objectAtIndex:i]; [db executeUpdate:query]; } } if([[[[updateDictionary objectForKey:@"table"] objectForKey:tableName] objectForKey:@"record"] count] > 0){ for (i = 0; i < [[[[updateDictionary objectForKey:@"table"] objectForKey:tableName] objectForKey:@"record"] count]; i++){ NSMutableArray *keys = [[NSMutableArray alloc] init]; NSMutableArray *values = [[NSMutableArray alloc] init]; for (id fieldsName in [[[[updateDictionary objectForKey:@"table"] objectForKey:tableName] objectForKey:@"record"]objectAtIndex:i]){ NSString *fieldsValue = [[[[[updateDictionary objectForKey:@"table"] objectForKey:tableName] objectForKey:@"record"]objectAtIndex:i]objectForKey:fieldsName]; [keys addObject:[NSString stringWithFormat:@"'%@'",fieldsName]]; if(fieldsValue == (NSString*)[NSNull null]){ fieldsValue = @""; } [values addObject:[NSString stringWithFormat:@"'%@'",fieldsValue]]; } NSString *keyString = [keys componentsJoinedByString:@", "]; NSString *valueString = [values componentsJoinedByString:@", "]; NSString *sql = [NSString stringWithFormat:@"INSERT INTO %@ (%@) VALUES (%@)",tableName, keyString, valueString]; [self alertByString:sql]; [db executeUpdate:sql]; } } } } } 最新内容请见作者的GitHub页：http://qaseven.github.io/
