我有sqlite数据库并且正在将数据检索到另一个tableview中怎么办？我很惊讶如何将数据库值添加到数组中以及如何将这些值添加到tableview中？ 这是我的代码 dbmodelclass.h
#import <UIKit/UIKit.h>
#import <sqlite3.h>
@interface dbModelClass :UIViewController
{
NSMutableDictionary *readDic;
NSMutableArray *readArray;
// sqlite3 *_database;
}
+(NSString *)connectDb;
+(BOOL)createTable;
+(BOOL)createTable3;
+(int)saveData:(NSMutableArray *)data;
+(int)saveData2:(NSMutableArray *)data;
+(NSMutableArray *)getData;
@end
This is my dbmodelclass.m
#import "dbModelClass.h"
#import "Expences.h"
@implementation dbModelClass;
-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
+(NSString *)connectDb
{
NSArray *docDir=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *dbFolder=[docDir objectAtIndex:0];
NSFileManager *manager=[NSFileManager defaultManager];
if (![manager fileExistsAtPath:dbFolder])
{
[manager createDirectoryAtPath:dbFolder withIntermediateDirectories:YES attributes:nil error:nil];
}
NSString *dbPath=[dbFolder stringByAppendingPathComponent:@"fappDB.sqlite"];
if (![manager fileExistsAtPath:dbPath])
{
[manager copyItemAtPath:[[[NSBundle mainBundle]resourcePath]stringByAppendingPathComponent:@"fappDB.sqlite"] toPath:dbPath error:nil];
}
NSLog(@"%@",dbPath);
return dbPath;
}
+(BOOL)createTable
{
NSString *dbpath=[dbModelClass connectDb];
sqlite3 *dbObj;
if (sqlite3_open([dbpath UTF8String], &dbObj)==SQLITE_OK)
{
sqlite3_stmt *stmt=nil;
const char *sql="create table deposit(deposit_amount VARCHAR,remarks VARCHAR)";
sqlite3_prepare_v2(dbObj, sql, -1, &stmt, nil);
if (sqlite3_step(stmt)==SQLITE_DONE)
{
NSLog(@"tabel created successfull");
}
else
{
NSLog(@"tabel already created");
}
sqlite3_finalize(stmt);
sqlite3_close(dbObj);
}
return YES;
}
+(BOOL)createTable3;
{
NSString *dbpath=[dbModelClass connectDb];
sqlite3 *dbObj;
if (sqlite3_open([dbpath UTF8String], &dbObj)==SQLITE_OK)
{
sqlite3_stmt *stmt=nil;
const char *sql="create table expense2(expense_title VARCHAR,description VARCHAR,amount VARCHAR,paidcash VARCHAR,date VARCHAR,remarks VARCHAR)";
sqlite3_prepare_v2(dbObj, sql, -1, &stmt, nil);
if (sqlite3_step(stmt)==SQLITE_DONE)
{
NSLog(@"tabel created successfull");
}
else
{
NSLog(@"tabel already created");
}
sqlite3_finalize(stmt);
sqlite3_close(dbObj);
}
return YES;
}
+(int)saveData:(NSMutableArray *)data
{
sqlite3 *dbObj;
sqlite3_stmt *stmt=nil;
NSString *dbPath=[dbModelClass connectDb];
const char *sql=[[NSString stringWithFormat:@"insert into deposit(deposit_amount,remarks) values(\"%@\",\"%@\")",[data objectAtIndex:0],[data objectAtIndex:1]]UTF8String];
if (sqlite3_open([dbPath UTF8String], &dbObj)==SQLITE_OK)
{
sqlite3_bind_text(stmt, 1, [[data objectAtIndex:0]UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 2, [[data objectAtIndex:1]UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_prepare_v2(dbObj, sql, -1, &stmt, nil);
if (sqlite3_step(stmt)==SQLITE_DONE)
{
NSLog(@"data insertion stmnt executed properly");
}
else
NSLog(@"data insertion stmnt not executed");
sqlite3_finalize(stmt);
sqlite3_close(dbObj);
}
return sqlite3_last_insert_rowid(dbObj);
}
+(int)saveData2:(NSMutableArray *)data
{
sqlite3 *dbObj;
sqlite3_stmt *stmt=nil;
NSString *dbPath=[dbModelClass connectDb];
const char *sql=[[NSString stringWithFormat:@"insert into expense2(expense_title,description,amount,paidcash,date,remarks) values(\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\")",[data objectAtIndex:0],[data objectAtIndex:1],[data objectAtIndex:2],[data objectAtIndex:3],[data objectAtIndex:4],[data objectAtIndex:5]]UTF8String];
if (sqlite3_open([dbPath UTF8String], &dbObj)==SQLITE_OK)
{
sqlite3_bind_text(stmt, 1, [[data objectAtIndex:0]UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 2, [[data objectAtIndex:1]UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 3, [[data objectAtIndex:2]UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 4, [[data objectAtIndex:3]UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 5, [[data objectAtIndex:4]UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 6, [[data objectAtIndex:5]UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_prepare_v2(dbObj, sql, -1, &stmt, nil);
if (sqlite3_step(stmt)==SQLITE_DONE)
{
NSLog(@"data insertion stmnt executed properly");
}
else
NSLog(@"data insertion stmnt not executed");
sqlite3_finalize(stmt);
sqlite3_close(dbObj);
}
return sqlite3_last_insert_rowid(dbObj);
}
+(NSMutableArray *)getData
{
sqlite3 *dbobj;
NSString *dbpath =[dbModelClass connectDb];
NSMutableArray *readArray=[[NSMutableArray alloc]init];
if(sqlite3_open([dbpath UTF8String], &dbobj)==SQLITE_OK)
{
sqlite3_stmt *statement=nil;
//**** NSString *string=@"SELECT name FROM emptable";
NSString *string=@"SELECT * FROM deposit";
const char *query=[string UTF8String];
if(sqlite3_prepare_v2(dbobj, query, -1, &statement, NULL)==SQLITE_OK)
{
while (sqlite3_step(statement)==SQLITE_ROW)
{
NSMutableDictionary *readDic=[[NSMutableDictionary alloc] init];
[readDic setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)] forKey:@"deposit_amount"];
// NSString *aName=[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)];
// NSString *pwd=[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 1)];
// [readDic setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 1)] forKey:@"password"];
// [readArray addObject:aName];
// [readArray1 addObject:pwd];
[readArray addObject:readDic];
// NSLog(@"%@",readDic);
}
}
sqlite3_finalize(statement);
}
NSLog(@"%@",readArray);
sqlite3_close(dbobj);
return readArray;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end
This is my netviewcontroller.h
#import <UIKit/UIKit.h>
@interface NetViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
{
IBOutlet UILabel *depositLabel,*expenseLabel,*netvalueLabel;
IBOutlet UITextField *netvalueText;
IBOutlet UITableView *depositTable;
}
@property (strong, nonatomic) UINavigationController *navigationController;
@property(strong,nonatomic)UILabel *depositLabel,*expenseLabel,*netvalueLabel;
@property(strong,nonatomic)UITextField *netvalueText;
@property(strong,nonatomic)UITableView *depositTable;
-(IBAction)netvalue:(id)sender;
@end
This is my netviewcontroller.m
#import "NetViewController.h"
#import "dbModelClass.h"
@interface NetViewController ()
@end
@implementation NetViewController
{
NSArray *tableData;
}
@synthesize depositLabel,netvalueLabel,depositTable,netvalueText;
//@synthesize str,depositData,depositArray;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[dbModelClass connectDb];
[dbModelClass getData];
/* depositArray=[[NSMutableArray alloc]init];
depositData=[[NSMutableArray alloc]init];
depositArray=[dbModelClass getData:str];
for( NSDictionary *dis in depositArray)
{
[depositData addObject:[dis objectForKey:@"depositTable"]];
}*/
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)netvalue:(id)sender
{
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [tableData count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = @"SimpleTableItem";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
cell.textLabel.text = [tableData objectAtIndex:indexPath.row];
return cell;
}
@end
答案 0 :(得分：3)
首先，阅读this教程中的NSArray。
然后阅读this教程中的NSDictionary。
然后你可以学习如何在sqlite中保存数据并在tableview中显示。
我发布了我的示例代码尝试按照这样的方式来帮助您
-(void)checkAndCreateDB
{
dataBasePath=[[NSString alloc] initWithString: [NSString stringWithFormat: @"%@/QRCodeDB.sqlite",[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]]];
BOOL success;
NSFileManager *filemanager=[NSFileManager defaultManager];
success=[filemanager fileExistsAtPath:dataBasePath];
if(success){
return;
}
NSString *databasePathFromApp=[[[NSBundle mainBundle]resourcePath]stringByAppendingPathComponent:@"QRCodeDB.sqlite"];
[filemanager copyItemAtPath:databasePathFromApp toPath:dataBasePath error:nil];
}
-(void)addNewItemWhereText:(NSString *)text imageData:(NSData *)data dateIs:(NSString *)date
{
[self checkAndCreateDB];
sqlite3_stmt *compiledStmt;
sqlite3 *db;
if(sqlite3_open([dataBasePath UTF8String], &db)==SQLITE_OK){
NSString *insertSQL=@"insert into History(image,text,date) VALUES(?,?,?)";
if(sqlite3_prepare_v2(db,[insertSQL cStringUsingEncoding:NSUTF8StringEncoding], -1, &compiledStmt, NULL) == SQLITE_OK)
{
sqlite3_bind_blob(compiledStmt, 1, [data bytes], [data length], SQLITE_TRANSIENT);
sqlite3_bind_text(compiledStmt, 2, [text UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(compiledStmt, 3, [date UTF8String], -1, SQLITE_TRANSIENT);
if(sqlite3_step(compiledStmt) != SQLITE_DONE ) {
NSLog( @"Error: %s", sqlite3_errmsg(db) );
} else {
NSLog( @"Insert into row id = %lld", (sqlite3_last_insert_rowid(db)));
}
sqlite3_finalize(compiledStmt);
}
}
sqlite3_close(db);
}
-(UIImage *)giveMeImageWhereDateIs:(NSString *)date
{
[self checkAndCreateDB];
UIImage *imageIs;
sqlite3_stmt *compiledStmt;
sqlite3 *db;
if(sqlite3_open([dataBasePath UTF8String], &db)==SQLITE_OK){
NSString *insertSQL = [NSString stringWithFormat:@"Select image from History Where date = '%@'",date];
if(sqlite3_prepare_v2(db,[insertSQL cStringUsingEncoding:NSUTF8StringEncoding], -1, &compiledStmt, NULL) == SQLITE_OK) {
while(sqlite3_step(compiledStmt) == SQLITE_ROW) {
int length = sqlite3_column_bytes(compiledStmt, 0);
NSData *imageData = [NSData dataWithBytes:sqlite3_column_blob(compiledStmt, 0) length:length];
imageIs=[UIImage imageWithData:imageData];
NSLog(@"Length : %d", [imageData length]);
}
}
sqlite3_finalize(compiledStmt);
}
sqlite3_close(db);
return imageIs;
}
-(NSArray *)giveMeAllDataInTable
{
NSMutableArray *tableDataArray=[[NSMutableArray alloc]init];
[self checkAndCreateDB];
sqlite3_stmt *compiledStmt;
sqlite3 *db;
if(sqlite3_open([dataBasePath UTF8String], &db)==SQLITE_OK){
NSString *insertSQL = [NSString stringWithFormat:@"Select * from History"];
if(sqlite3_prepare_v2(db,[insertSQL cStringUsingEncoding:NSUTF8StringEncoding], -1, &compiledStmt, NULL) == SQLITE_OK) {
while(sqlite3_step(compiledStmt) == SQLITE_ROW)
{
NSMutableDictionary *dict=[[NSMutableDictionary alloc]init];
// int length = sqlite3_column_bytes(compiledStmt, 0);
// NSData *imageData = [NSData dataWithBytes:sqlite3_column_blob(compiledStmt, 0) length:length];
[dict setObject:[NSString stringWithUTF8String:(char*)sqlite3_column_text(compiledStmt, 1)] forKey:@"text"];
[dict setObject:[NSString stringWithUTF8String:(char*)sqlite3_column_text(compiledStmt, 2)] forKey:@"date"];
[tableDataArray addObject:dict];
}
}
sqlite3_finalize(compiledStmt);
}
sqlite3_close(db);
return tableDataArray;
}
答案 1 :(得分：0)
首先，我无法看到你初始化dbModelClass对象
其次，您的方法getData将返回包含sqlite数据的数组。你没有在任何地方保存。
- (void)viewDidLoad
{
[super viewDidLoad];
[dbModelClass connectDb];
编辑：tableData是您在Class NetViewController中使用的NSArray
替换此行
[dbModelClass getData];
有了这个
tableData = [dbModelClass getData];
NSLog(@"Content for tableData - %@ ",tableData);
建议：对类名称使用第一个字母大写