我一直在努力争取过去两天这个问题,我似乎无法弄清楚。我有一个具有以下结构的SQlite数据库。iOS的NSArray从SQLite在UITableView的NSDictionaries
它是一个列表和List_Items
我访问数据库,并创建一个对象,然后将其添加到被添加到一个的NSArray NSDictionary的之间一对多的关系。我做了两次,一次用于List表,一次用于List_Items。 然后我使用列表数组来计算我的tableview行的列表数,然后将它们添加到tableview。
的问题出现时,我得到的方法
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
我似乎无法弄清楚如何匹配的列表和List_Items的记录,以显示属于该名单列表中的项目一个向下钻取tableview。因为我的心在这一点玉米粥
具体代码示例会有帮助:(
下面是相关的代码,我有多达我目前Writersblock。
//#******************************************************#
// *******Start Database*******
//#******************************************************#
-(void)checkAndCreateDatabase
{
// Check if the SQL database has already been saved to the users phone, if not then copy it over
BOOL success;
// Create a FileManager object, we will use this to check the status
// of the database and to copy it over if required
NSFileManager *fileManager = [NSFileManager defaultManager];
// Check if the database has already been created in the users filesystem
success = [fileManager fileExistsAtPath:databasePath];
// If the database already exists then return without doing anything
if(success) return;
// If not then proceed to copy the database from the application to the users filesystem
// Get the path to the database in the application package
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];
// Copy the database from the package to the users filesystem
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
}
-(void)readItemsFromDatabase
{
// Setup the database object
sqlite3 *database;
// Init the Items Array
items = [[NSMutableArray alloc] init];
lists = [[NSMutableArray alloc] init];
//---------------### SELECT THE LISTS #####---------------//
// Open the database from the users filessytem
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSLog(@"SQL Opened");
// Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "SELECT * from List";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
// Loop through the results and add them to the array
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
// Read the data from the result row
NSString *aListName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
NSString *aUserID = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
NSString *aListID = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)];
NSLog(@"SQL Compiled");
// Create a new list object with the data from the database
List *list = [[List alloc] initWithlistName:(NSString *)aListName userID:(NSString *)aUserID listID:(NSString *)aListID];
listNames = [NSDictionary dictionaryWithObjectsAndKeys:list.listName,@"listName",list.listID,@"listID",list.listID,@"listID",nil];
// Add the Shopping object to the list Array
[lists addObject:listNames];
}
}
else { NSLog(@"Database Not Found");}
// Release the compiled statement from memory
sqlite3_finalize(compiledStatement);
}
sqlite3_close(database);
//---------------### SELECT THE LIST_ITEMS #####---------------//
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSLog(@"SQL Opened");
// Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "SELECT * from List_Items";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
// Loop through the results and add them to the array
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
// Read the data from the result row
NSString *aBrandName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
NSString *aItemName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
NSString *aItemQuantity = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 4)];
NSString *aImageUrl = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 5)];
NSString *aListID = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 6)];
NSLog(@"SQL Compiled");
// Create a new items object with the data from the database
Shopping *shopping = [[Shopping alloc] initWithlistID:(NSString *)aListID brandName:(NSString *)aBrandName itemName:(NSString *)aItemName itemQuantity:(NSString *)aItemQuantity imageURL:(NSString *)aImageUrl];
itemList = [NSDictionary dictionaryWithObjectsAndKeys:shopping.listID,@"listID",shopping.brandName,@"brandName",shopping.itemName,@"itemName",shopping.itemQuantity,@"itemQuantity",shopping.imageURL,@"imageURL",nil];
// Add the Shopping object to the items Array
[items addObject:itemList];
}
}
else { NSLog(@"Database Not Found");}
// Release the compiled statement from memory
sqlite3_finalize(compiledStatement);
NSLog(@"%@",items);
NSLog(@"%@",lists);
}
sqlite3_close(database);
}
//#******************************************************#
// *******END Database*******
//#******************************************************#
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
int rowcount;
rowcount = [lists count];
return rowcount;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier];
}
// Set up the cell...
NSString *cellValue = [[lists objectAtIndex:indexPath.row] objectForKey:@"listName"];
cell.textLabel.text = cellValue;
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([[lists objectAtIndex:indexPath.row] objectForKey:@"listID"] != NULL)
{
NSString *listIndex = [[lists objectAtIndex:indexPath.row] objectForKey:@"listID"];
int i = [listIndex intValue];
NSLog(@"indexPath: %d",i);
}
}
编辑**** ******
的单个SQL语句返回多个列表名,这是一个问题,因为我只需要每个列表的名字之一。
我在同一个查询在他们面前,但我得到了太多的对象回来,因为它是一个一对多的关系,例如我还是会回到3个对象,所有具有相同LISTNAME但不同的项目。所以当我将Listname添加到tableview时,我将拥有三个相同的listName,因为它有三个项目。 – KMG 2012-03-09 05:26:12
是的,当我在字典上进行NSLog时,我每次都返回7个listName,我只需要每个列表中的一个。 – KMG 2012-03-09 05:35:51
这是我的两个列表的SQL查询“const char * sqlStatement =”SELECT * from List,List_Items“;” – KMG 2012-03-09 05:36:50