我将SQLite数据库连接到我的ipad应用程序。 db有两个表，1个表填充数据，其他表保存应用程序中给出的数据。但问题是我的数据库没有刷新并保存数据..例如：如果我向表添加新名称它不会自动填充，只有当我再次使用不同的名称添加db文件时它才会填充它没有保存我想保存的数据。
请给我你宝贵的建议
请找到我的代码供您参考：
#import <UIKit/UIKit.h>
#import "PersonDatabase.h"
#import "sqlite3.h"
#import <sqlite3.h>
@interface ViewController : UIViewController<UITextViewDelegate>{
PersonDatabase *perDas;
NSString * nameString;
NSString * statusString;
sqlite3 *database;
NSString * empString;
}
@property (retain, nonatomic) IBOutlet UITableView *tableView;
@property (strong, nonatomic) IBOutlet UIButton *signIn;
@property (strong, nonatomic) IBOutlet UIButton *signOut;
@property (strong, nonatomic) IBOutlet UILabel *nameLabel;
@property (strong, nonatomic) IBOutlet NSString * nameString;
@property (strong, nonatomic) IBOutlet NSString * statusString;
-(IBAction)signin:(id)sender;
-(IBAction)signout:(id)sender;
@end
#import "ViewController.h"
#import "PersonInfo.h"
#import "PersonDatabase.h"
@implementation ViewController
@synthesize tableView;
@synthesize signIn;
@synthesize signOut;
@synthesize nameLabel;
@synthesize nameString,statusString;;
- (void)viewDidLoad
{
[super viewDidLoad];
if (perDas == nil) {
perDas = [[PersonDatabase alloc] init];
}
[tableView setDataSource:perDas];
[tableView setDelegate:perDas];
perDas.view = perDas.tableView;
}
-(IBAction)signin:(id)sender{
NSLog(@"%@",perDas.string1);
nameString=[[NSString alloc]initWithString:perDas.string1];
statusString=[[NSString alloc]initWithFormat:@"IN"];
{
NSLog(@"passed");
sqlite3_stmt *statement;
const char *dbpath = [perDas.databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSLog(@"pass");
NSString *insertSQL = [NSString stringWithFormat: @"INSERT INTO status (names, staus, signin, singnout) VALUES (\"%@\", \"%@\", datetime(), \"%@\")", nameString, statusString,empString];
NSLog(@"%@",insertSQL);
const char *insert_stmt = [insertSQL UTF8String];
int results= sqlite3_prepare_v2(database, insert_stmt, -1, &statement, NULL);
NSLog(@"%i", results);
if(sqlite3_step(statement) == SQLITE_DONE){
NSLog(@"done");
}else {
printf( "could not prepare statemnt: %s\n", sqlite3_errmsg(database) );
}
sqlite3_finalize(statement);
sqlite3_close(database);
}
}}
-(IBAction)signout:(id)sender{
NSLog(@"%@",perDas.string1);}
- (void)viewDidUnload
{
[self setTableView:nil];
[self setSignIn:nil];
[self setSignOut:nil];
[self setNameLabel:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
@end
#import <Foundation/Foundation.h>
@interface PersonInfo : NSObject{
int unique;
NSString * nam;
}
@property(nonatomic, assign)int unique;
@property(nonatomic, copy)NSString * nam;
-(id) initWithUniqueId:(int)uniqueId name:(NSString *)name;
@end
#import "PersonInfo.h"
@implementation PersonInfo
@synthesize unique,nam;
-(id) initWithUniqueId:(int)uniqueId name:(NSString *)name{
self=[super init];
if (self) {
self.unique=uniqueId;
self.nam=name;
}
return self;
}
@end
#import <UIKit/UIKit.h>
#import "sqlite3.h"
#import <sqlite3.h>
#import "PersonInfo.h"
@interface PersonDatabase : UITableViewController<UITableViewDataSource>{
NSString *databaseName;
NSString * databasePath;
NSMutableArray *tableOne;
NSString * string1;
NSString * dateString;
NSString * timeString;
sqlite3 *database;
NSString * empString;
}
@property(nonatomic, retain) NSMutableArray *tableOne;
@property(nonatomic, retain) NSString * string1;
@property(nonatomic, retain) NSString * databasePath;
-(void)checkAndCreateDatabase;
-(void)readDataFromDatabase;
@end
#import "PersonDatabase.h"
#import "PersonInfo.h"
#import "ViewController.h"
@implementation PersonDatabase
@synthesize tableOne, string1,databasePath;
#pragma mark - View lifecycle
- (void)viewDidLoad
{
databaseName=@"log.sqlite3";
NSArray *documentPaths= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * documentDir = [documentPaths objectAtIndex:0];
databasePath=[documentDir stringByAppendingPathComponent:databaseName];
[self checkAndCreateDatabase];
[self readDataFromDatabase];
[super viewDidLoad];
NSLog(@"a");
// Do any additional setup after loading the view, typically from a nib.
}
#pragma mark - TableView Data Source methods
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [tableOne count]; }
// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell= nil;
cell = [tableView dequeueReusableCellWithIdentifier:@"mycell"];
if (cell == nil) {
cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"mycell"];}
PersonInfo * temp =(PersonInfo *)[self.tableOne objectAtIndex:indexPath.row];
cell.textLabel.text=temp.nam;
return cell;
}
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
string1 = cell.textLabel.text;
NSLog(@"%@",string1);
}
-(void)checkAndCreateDatabase{
BOOL success;
NSFileManager *fileManager=[NSFileManager defaultManager];
success=[fileManager fileExistsAtPath:databasePath];
if(success)
return;
NSString *databasePathFromApp = [[[NSBundle mainBundle]resourcePath] stringByAppendingPathComponent:databaseName];
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
}
-(void)readDataFromDatabase{
tableOne=[[NSMutableArray alloc]init];
if(sqlite3_open([databasePath UTF8String], &database)== SQLITE_OK){
const char *sqlStatement = "SELECT * FROM names";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL)==SQLITE_OK){
while (sqlite3_step(compiledStatement)==SQLITE_ROW) {
int uniqueId = sqlite3_column_int(compiledStatement, 0);
char *nameChars=(char *)sqlite3_column_text(compiledStatement,1);
NSString *name=[[NSString alloc]initWithUTF8String:nameChars];
PersonInfo *info=[[PersonInfo alloc]initWithUniqueId:uniqueId name:name];
[tableOne addObject:info];
}
}
sqlite3_finalize(compiledStatement);
}
sqlite3_close(database);
}
@end
提前致谢!!!
答案 0 :(得分：0)
以下是我的数据库功能，他们工作正常试试这个..
-(void)dbconnect{
self.dbName=@"MyDb.sqlite";
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
self.dbPath=[documentsDir stringByAppendingPathComponent:self.dbName];
NSLog(@"DBPATH%@",self.dbPath);
[self checkAndCreateDatabase];
}
-(void)checkAndCreateDatabase{
BOOL success;
//check file exists in document directory
NSFileManager *fileManager=[NSFileManager defaultManager];
success=[fileManager fileExistsAtPath:self.dbPath];
//if file exists in document directory then return
if(success)
return;
//if file do not exists copy it in documents directory
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:dbName];
[fileManager copyItemAtPath:databasePathFromApp toPath:self.dbPath error:nil];
[fileManager release];
}
-(sqlite3_stmt*) PrepareStatement:(const char *)sql{
// Setup the database object
sqlite3 *database;
// Init the animals Array
// Open the database from the users filessytem
if(sqlite3_open([self.dbPath UTF8String], &database) == SQLITE_OK) {
// Setup the SQL Statement and compile it for faster access
const char *sqlStatement = sql;
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement,-1, &compiledStatement, NULL) == SQLITE_OK) {
//NSLog(@"COMPILED STATEMENT: %@",compiledStatement);
return compiledStatement;
}
}
return nil;
}
- (void) showException :(NSException *)e {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Trade Voice" message:[NSString stringWithFormat:@"Error - %@",e.name] delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
[alertView show];
[alertView release];
}
/*DB CONN End*/
-(BOOL) sleepDatabase:(sqlite3 *)dbase {
if (sqlite3_open([self.dbPath UTF8String], &dbase) == SQLITE_BUSY || sqlite3_open([self.dbPath UTF8String], &dbase) == SQLITE_LOCKED) {
NSLog(@"Database in sleep");
return YES;
} else {
return NO;
}
}
//////保存更新删除的代码
-(void)insertMaterialDetail:(Material *)objMaterial{
sqlite3 *database;
if(sqlite3_open([self.dbPath UTF8String], &database) == SQLITE_OK) {
const char* sql = "INSERT INTO Material (name,amt) VALUES (?,?)";
sqlite3_stmt *statement;
statement = [self PrepareStatement:sql];
int a1=sqlite3_bind_text(statement, 1, [objMaterial.name UTF8String], -1, SQLITE_TRANSIENT);
int a2 = sqlite3_bind_double(statement, 2, objMaterial.amt);
//NSLog(@"query %s",sql);
if (statement)
{
if (a1 != SQLITE_OK || a2 != SQLITE_OK )
{
sqlite3_finalize(statement);
return;
}
sqlite3_step(statement);
}
sqlite3_finalize(statement);
}
}
-(int)updateMaterial:(Material *)objMaterial{
@try {
if(sqlite3_open([dbPath UTF8String], &delDatabase) == SQLITE_OK) {
sqlite3_stmt* statement = nil;
const char* sql = "update Material set name = ?, amt = ? where material_id = ?";
statement = [self PrepareStatement:sql];
int a1 = sqlite3_bind_text(statement, 1, [objMaterial.name UTF8String], -1, SQLITE_TRANSIENT);
int a2 = sqlite3_bind_double(statement,2, objMaterial.amt);
int a3 = sqlite3_bind_int(statement, 3, objMaterial.material_id);
if (statement)
{
if (a1 != SQLITE_OK || a2 != SQLITE_OK || a3 != SQLITE_OK)
{
sqlite3_finalize(statement);
return 0;
}
sqlite3_step(statement);
}
sqlite3_finalize(statement);
}
}
@catch (NSException * e) {
[self showException:e];
}
@finally {
sqlite3_close(delDatabase);
return 1;
}
}
-(void)deleteMaterial:(int)Materialid{
sqlite3 *database;
if(sqlite3_open([self.dbPath UTF8String], &database) == SQLITE_OK) {
sqlite3_stmt *deleteStmt;
const char *sql = "Delete from Material where material_id = ?";
if(sqlite3_prepare_v2(database, sql, -1, &deleteStmt, NULL) != SQLITE_OK)
NSAssert1(0, @"Error while creating delete statement. '%s'", sqlite3_errmsg(database));
//When binding parameters, index starts from 1 and not zero.
sqlite3_bind_int(deleteStmt, 1, Materialid);
if (SQLITE_DONE != sqlite3_step(deleteStmt))
{
NSAssert1(0, @"Error while deleting. '%s'", sqlite3_errmsg(database));
}
sqlite3_reset(deleteStmt);
}
}